--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/java/io/ObjectStreamClass.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,2351 @@
+/*
+ * Copyright (c) 1996, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.io;
+
+import java.lang.ref.Reference;
+import java.lang.ref.ReferenceQueue;
+import java.lang.ref.SoftReference;
+import java.lang.ref.WeakReference;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Member;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.lang.reflect.Proxy;
+import java.security.AccessController;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivilegedAction;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import jdk.internal.misc.Unsafe;
+import jdk.internal.reflect.CallerSensitive;
+import jdk.internal.reflect.Reflection;
+import jdk.internal.reflect.ReflectionFactory;
+import sun.reflect.misc.ReflectUtil;
+
+import static java.io.ObjectStreamField.*;
+
+/**
+ * Serialization's descriptor for classes. It contains the name and
+ * serialVersionUID of the class. The ObjectStreamClass for a specific class
+ * loaded in this Java VM can be found/created using the lookup method.
+ *
+ * <p>The algorithm to compute the SerialVersionUID is described in
+ * <a href="{@docRoot}/../specs/serialization/class.html#stream-unique-identifiers">
+ * Object Serialization Specification, Section 4.6, Stream Unique Identifiers</a>.
+ *
+ * @author Mike Warres
+ * @author Roger Riggs
+ * @see ObjectStreamField
+ * @see <a href="{@docRoot}/../specs/serialization/class.html">
+ * Object Serialization Specification, Section 4, Class Descriptors</a>
+ * @since 1.1
+ */
+public class ObjectStreamClass implements Serializable {
+
+ /** serialPersistentFields value indicating no serializable fields */
+ public static final ObjectStreamField[] NO_FIELDS =
+ new ObjectStreamField[0];
+
+ private static final long serialVersionUID = -6120832682080437368L;
+ private static final ObjectStreamField[] serialPersistentFields =
+ NO_FIELDS;
+
+ /** reflection factory for obtaining serialization constructors */
+ private static final ReflectionFactory reflFactory =
+ AccessController.doPrivileged(
+ new ReflectionFactory.GetReflectionFactoryAction());
+
+ private static class Caches {
+ /** cache mapping local classes -> descriptors */
+ static final ConcurrentMap<WeakClassKey,Reference<?>> localDescs =
+ new ConcurrentHashMap<>();
+
+ /** cache mapping field group/local desc pairs -> field reflectors */
+ static final ConcurrentMap<FieldReflectorKey,Reference<?>> reflectors =
+ new ConcurrentHashMap<>();
+
+ /** queue for WeakReferences to local classes */
+ private static final ReferenceQueue<Class<?>> localDescsQueue =
+ new ReferenceQueue<>();
+ /** queue for WeakReferences to field reflectors keys */
+ private static final ReferenceQueue<Class<?>> reflectorsQueue =
+ new ReferenceQueue<>();
+ }
+
+ /** class associated with this descriptor (if any) */
+ private Class<?> cl;
+ /** name of class represented by this descriptor */
+ private String name;
+ /** serialVersionUID of represented class (null if not computed yet) */
+ private volatile Long suid;
+
+ /** true if represents dynamic proxy class */
+ private boolean isProxy;
+ /** true if represents enum type */
+ private boolean isEnum;
+ /** true if represented class implements Serializable */
+ private boolean serializable;
+ /** true if represented class implements Externalizable */
+ private boolean externalizable;
+ /** true if desc has data written by class-defined writeObject method */
+ private boolean hasWriteObjectData;
+ /**
+ * true if desc has externalizable data written in block data format; this
+ * must be true by default to accommodate ObjectInputStream subclasses which
+ * override readClassDescriptor() to return class descriptors obtained from
+ * ObjectStreamClass.lookup() (see 4461737)
+ */
+ private boolean hasBlockExternalData = true;
+
+ /**
+ * Contains information about InvalidClassException instances to be thrown
+ * when attempting operations on an invalid class. Note that instances of
+ * this class are immutable and are potentially shared among
+ * ObjectStreamClass instances.
+ */
+ private static class ExceptionInfo {
+ private final String className;
+ private final String message;
+
+ ExceptionInfo(String cn, String msg) {
+ className = cn;
+ message = msg;
+ }
+
+ /**
+ * Returns (does not throw) an InvalidClassException instance created
+ * from the information in this object, suitable for being thrown by
+ * the caller.
+ */
+ InvalidClassException newInvalidClassException() {
+ return new InvalidClassException(className, message);
+ }
+ }
+
+ /** exception (if any) thrown while attempting to resolve class */
+ private ClassNotFoundException resolveEx;
+ /** exception (if any) to throw if non-enum deserialization attempted */
+ private ExceptionInfo deserializeEx;
+ /** exception (if any) to throw if non-enum serialization attempted */
+ private ExceptionInfo serializeEx;
+ /** exception (if any) to throw if default serialization attempted */
+ private ExceptionInfo defaultSerializeEx;
+
+ /** serializable fields */
+ private ObjectStreamField[] fields;
+ /** aggregate marshalled size of primitive fields */
+ private int primDataSize;
+ /** number of non-primitive fields */
+ private int numObjFields;
+ /** reflector for setting/getting serializable field values */
+ private FieldReflector fieldRefl;
+ /** data layout of serialized objects described by this class desc */
+ private volatile ClassDataSlot[] dataLayout;
+
+ /** serialization-appropriate constructor, or null if none */
+ private Constructor<?> cons;
+ /** class-defined writeObject method, or null if none */
+ private Method writeObjectMethod;
+ /** class-defined readObject method, or null if none */
+ private Method readObjectMethod;
+ /** class-defined readObjectNoData method, or null if none */
+ private Method readObjectNoDataMethod;
+ /** class-defined writeReplace method, or null if none */
+ private Method writeReplaceMethod;
+ /** class-defined readResolve method, or null if none */
+ private Method readResolveMethod;
+
+ /** local class descriptor for represented class (may point to self) */
+ private ObjectStreamClass localDesc;
+ /** superclass descriptor appearing in stream */
+ private ObjectStreamClass superDesc;
+
+ /** true if, and only if, the object has been correctly initialized */
+ private boolean initialized;
+
+ /**
+ * Initializes native code.
+ */
+ private static native void initNative();
+ static {
+ initNative();
+ }
+
+ /**
+ * Find the descriptor for a class that can be serialized. Creates an
+ * ObjectStreamClass instance if one does not exist yet for class. Null is
+ * returned if the specified class does not implement java.io.Serializable
+ * or java.io.Externalizable.
+ *
+ * @param cl class for which to get the descriptor
+ * @return the class descriptor for the specified class
+ */
+ public static ObjectStreamClass lookup(Class<?> cl) {
+ return lookup(cl, false);
+ }
+
+ /**
+ * Returns the descriptor for any class, regardless of whether it
+ * implements {@link Serializable}.
+ *
+ * @param cl class for which to get the descriptor
+ * @return the class descriptor for the specified class
+ * @since 1.6
+ */
+ public static ObjectStreamClass lookupAny(Class<?> cl) {
+ return lookup(cl, true);
+ }
+
+ /**
+ * Returns the name of the class described by this descriptor.
+ * This method returns the name of the class in the format that
+ * is used by the {@link Class#getName} method.
+ *
+ * @return a string representing the name of the class
+ */
+ public String getName() {
+ return name;
+ }
+
+ /**
+ * Return the serialVersionUID for this class. The serialVersionUID
+ * defines a set of classes all with the same name that have evolved from a
+ * common root class and agree to be serialized and deserialized using a
+ * common format. NonSerializable classes have a serialVersionUID of 0L.
+ *
+ * @return the SUID of the class described by this descriptor
+ */
+ public long getSerialVersionUID() {
+ // REMIND: synchronize instead of relying on volatile?
+ if (suid == null) {
+ suid = AccessController.doPrivileged(
+ new PrivilegedAction<Long>() {
+ public Long run() {
+ return computeDefaultSUID(cl);
+ }
+ }
+ );
+ }
+ return suid.longValue();
+ }
+
+ /**
+ * Return the class in the local VM that this version is mapped to. Null
+ * is returned if there is no corresponding local class.
+ *
+ * @return the <code>Class</code> instance that this descriptor represents
+ */
+ @CallerSensitive
+ public Class<?> forClass() {
+ if (cl == null) {
+ return null;
+ }
+ requireInitialized();
+ if (System.getSecurityManager() != null) {
+ Class<?> caller = Reflection.getCallerClass();
+ if (ReflectUtil.needsPackageAccessCheck(caller.getClassLoader(), cl.getClassLoader())) {
+ ReflectUtil.checkPackageAccess(cl);
+ }
+ }
+ return cl;
+ }
+
+ /**
+ * Return an array of the fields of this serializable class.
+ *
+ * @return an array containing an element for each persistent field of
+ * this class. Returns an array of length zero if there are no
+ * fields.
+ * @since 1.2
+ */
+ public ObjectStreamField[] getFields() {
+ return getFields(true);
+ }
+
+ /**
+ * Get the field of this class by name.
+ *
+ * @param name the name of the data field to look for
+ * @return The ObjectStreamField object of the named field or null if
+ * there is no such named field.
+ */
+ public ObjectStreamField getField(String name) {
+ return getField(name, null);
+ }
+
+ /**
+ * Return a string describing this ObjectStreamClass.
+ */
+ public String toString() {
+ return name + ": static final long serialVersionUID = " +
+ getSerialVersionUID() + "L;";
+ }
+
+ /**
+ * Looks up and returns class descriptor for given class, or null if class
+ * is non-serializable and "all" is set to false.
+ *
+ * @param cl class to look up
+ * @param all if true, return descriptors for all classes; if false, only
+ * return descriptors for serializable classes
+ */
+ static ObjectStreamClass lookup(Class<?> cl, boolean all) {
+ if (!(all || Serializable.class.isAssignableFrom(cl))) {
+ return null;
+ }
+ processQueue(Caches.localDescsQueue, Caches.localDescs);
+ WeakClassKey key = new WeakClassKey(cl, Caches.localDescsQueue);
+ Reference<?> ref = Caches.localDescs.get(key);
+ Object entry = null;
+ if (ref != null) {
+ entry = ref.get();
+ }
+ EntryFuture future = null;
+ if (entry == null) {
+ EntryFuture newEntry = new EntryFuture();
+ Reference<?> newRef = new SoftReference<>(newEntry);
+ do {
+ if (ref != null) {
+ Caches.localDescs.remove(key, ref);
+ }
+ ref = Caches.localDescs.putIfAbsent(key, newRef);
+ if (ref != null) {
+ entry = ref.get();
+ }
+ } while (ref != null && entry == null);
+ if (entry == null) {
+ future = newEntry;
+ }
+ }
+
+ if (entry instanceof ObjectStreamClass) { // check common case first
+ return (ObjectStreamClass) entry;
+ }
+ if (entry instanceof EntryFuture) {
+ future = (EntryFuture) entry;
+ if (future.getOwner() == Thread.currentThread()) {
+ /*
+ * Handle nested call situation described by 4803747: waiting
+ * for future value to be set by a lookup() call further up the
+ * stack will result in deadlock, so calculate and set the
+ * future value here instead.
+ */
+ entry = null;
+ } else {
+ entry = future.get();
+ }
+ }
+ if (entry == null) {
+ try {
+ entry = new ObjectStreamClass(cl);
+ } catch (Throwable th) {
+ entry = th;
+ }
+ if (future.set(entry)) {
+ Caches.localDescs.put(key, new SoftReference<>(entry));
+ } else {
+ // nested lookup call already set future
+ entry = future.get();
+ }
+ }
+
+ if (entry instanceof ObjectStreamClass) {
+ return (ObjectStreamClass) entry;
+ } else if (entry instanceof RuntimeException) {
+ throw (RuntimeException) entry;
+ } else if (entry instanceof Error) {
+ throw (Error) entry;
+ } else {
+ throw new InternalError("unexpected entry: " + entry);
+ }
+ }
+
+ /**
+ * Placeholder used in class descriptor and field reflector lookup tables
+ * for an entry in the process of being initialized. (Internal) callers
+ * which receive an EntryFuture belonging to another thread as the result
+ * of a lookup should call the get() method of the EntryFuture; this will
+ * return the actual entry once it is ready for use and has been set(). To
+ * conserve objects, EntryFutures synchronize on themselves.
+ */
+ private static class EntryFuture {
+
+ private static final Object unset = new Object();
+ private final Thread owner = Thread.currentThread();
+ private Object entry = unset;
+
+ /**
+ * Attempts to set the value contained by this EntryFuture. If the
+ * EntryFuture's value has not been set already, then the value is
+ * saved, any callers blocked in the get() method are notified, and
+ * true is returned. If the value has already been set, then no saving
+ * or notification occurs, and false is returned.
+ */
+ synchronized boolean set(Object entry) {
+ if (this.entry != unset) {
+ return false;
+ }
+ this.entry = entry;
+ notifyAll();
+ return true;
+ }
+
+ /**
+ * Returns the value contained by this EntryFuture, blocking if
+ * necessary until a value is set.
+ */
+ synchronized Object get() {
+ boolean interrupted = false;
+ while (entry == unset) {
+ try {
+ wait();
+ } catch (InterruptedException ex) {
+ interrupted = true;
+ }
+ }
+ if (interrupted) {
+ AccessController.doPrivileged(
+ new PrivilegedAction<>() {
+ public Void run() {
+ Thread.currentThread().interrupt();
+ return null;
+ }
+ }
+ );
+ }
+ return entry;
+ }
+
+ /**
+ * Returns the thread that created this EntryFuture.
+ */
+ Thread getOwner() {
+ return owner;
+ }
+ }
+
+ /**
+ * Creates local class descriptor representing given class.
+ */
+ private ObjectStreamClass(final Class<?> cl) {
+ this.cl = cl;
+ name = cl.getName();
+ isProxy = Proxy.isProxyClass(cl);
+ isEnum = Enum.class.isAssignableFrom(cl);
+ serializable = Serializable.class.isAssignableFrom(cl);
+ externalizable = Externalizable.class.isAssignableFrom(cl);
+
+ Class<?> superCl = cl.getSuperclass();
+ superDesc = (superCl != null) ? lookup(superCl, false) : null;
+ localDesc = this;
+
+ if (serializable) {
+ AccessController.doPrivileged(new PrivilegedAction<>() {
+ public Void run() {
+ if (isEnum) {
+ suid = Long.valueOf(0);
+ fields = NO_FIELDS;
+ return null;
+ }
+ if (cl.isArray()) {
+ fields = NO_FIELDS;
+ return null;
+ }
+
+ suid = getDeclaredSUID(cl);
+ try {
+ fields = getSerialFields(cl);
+ computeFieldOffsets();
+ } catch (InvalidClassException e) {
+ serializeEx = deserializeEx =
+ new ExceptionInfo(e.classname, e.getMessage());
+ fields = NO_FIELDS;
+ }
+
+ if (externalizable) {
+ cons = getExternalizableConstructor(cl);
+ } else {
+ cons = getSerializableConstructor(cl);
+ writeObjectMethod = getPrivateMethod(cl, "writeObject",
+ new Class<?>[] { ObjectOutputStream.class },
+ Void.TYPE);
+ readObjectMethod = getPrivateMethod(cl, "readObject",
+ new Class<?>[] { ObjectInputStream.class },
+ Void.TYPE);
+ readObjectNoDataMethod = getPrivateMethod(
+ cl, "readObjectNoData", null, Void.TYPE);
+ hasWriteObjectData = (writeObjectMethod != null);
+ }
+ writeReplaceMethod = getInheritableMethod(
+ cl, "writeReplace", null, Object.class);
+ readResolveMethod = getInheritableMethod(
+ cl, "readResolve", null, Object.class);
+ return null;
+ }
+ });
+ } else {
+ suid = Long.valueOf(0);
+ fields = NO_FIELDS;
+ }
+
+ try {
+ fieldRefl = getReflector(fields, this);
+ } catch (InvalidClassException ex) {
+ // field mismatches impossible when matching local fields vs. self
+ throw new InternalError(ex);
+ }
+
+ if (deserializeEx == null) {
+ if (isEnum) {
+ deserializeEx = new ExceptionInfo(name, "enum type");
+ } else if (cons == null) {
+ deserializeEx = new ExceptionInfo(name, "no valid constructor");
+ }
+ }
+ for (int i = 0; i < fields.length; i++) {
+ if (fields[i].getField() == null) {
+ defaultSerializeEx = new ExceptionInfo(
+ name, "unmatched serializable field(s) declared");
+ }
+ }
+ initialized = true;
+ }
+
+ /**
+ * Creates blank class descriptor which should be initialized via a
+ * subsequent call to initProxy(), initNonProxy() or readNonProxy().
+ */
+ ObjectStreamClass() {
+ }
+
+ /**
+ * Initializes class descriptor representing a proxy class.
+ */
+ void initProxy(Class<?> cl,
+ ClassNotFoundException resolveEx,
+ ObjectStreamClass superDesc)
+ throws InvalidClassException
+ {
+ ObjectStreamClass osc = null;
+ if (cl != null) {
+ osc = lookup(cl, true);
+ if (!osc.isProxy) {
+ throw new InvalidClassException(
+ "cannot bind proxy descriptor to a non-proxy class");
+ }
+ }
+ this.cl = cl;
+ this.resolveEx = resolveEx;
+ this.superDesc = superDesc;
+ isProxy = true;
+ serializable = true;
+ suid = Long.valueOf(0);
+ fields = NO_FIELDS;
+ if (osc != null) {
+ localDesc = osc;
+ name = localDesc.name;
+ externalizable = localDesc.externalizable;
+ writeReplaceMethod = localDesc.writeReplaceMethod;
+ readResolveMethod = localDesc.readResolveMethod;
+ deserializeEx = localDesc.deserializeEx;
+ cons = localDesc.cons;
+ }
+ fieldRefl = getReflector(fields, localDesc);
+ initialized = true;
+ }
+
+ /**
+ * Initializes class descriptor representing a non-proxy class.
+ */
+ void initNonProxy(ObjectStreamClass model,
+ Class<?> cl,
+ ClassNotFoundException resolveEx,
+ ObjectStreamClass superDesc)
+ throws InvalidClassException
+ {
+ long suid = Long.valueOf(model.getSerialVersionUID());
+ ObjectStreamClass osc = null;
+ if (cl != null) {
+ osc = lookup(cl, true);
+ if (osc.isProxy) {
+ throw new InvalidClassException(
+ "cannot bind non-proxy descriptor to a proxy class");
+ }
+ if (model.isEnum != osc.isEnum) {
+ throw new InvalidClassException(model.isEnum ?
+ "cannot bind enum descriptor to a non-enum class" :
+ "cannot bind non-enum descriptor to an enum class");
+ }
+
+ if (model.serializable == osc.serializable &&
+ !cl.isArray() &&
+ suid != osc.getSerialVersionUID()) {
+ throw new InvalidClassException(osc.name,
+ "local class incompatible: " +
+ "stream classdesc serialVersionUID = " + suid +
+ ", local class serialVersionUID = " +
+ osc.getSerialVersionUID());
+ }
+
+ if (!classNamesEqual(model.name, osc.name)) {
+ throw new InvalidClassException(osc.name,
+ "local class name incompatible with stream class " +
+ "name \"" + model.name + "\"");
+ }
+
+ if (!model.isEnum) {
+ if ((model.serializable == osc.serializable) &&
+ (model.externalizable != osc.externalizable)) {
+ throw new InvalidClassException(osc.name,
+ "Serializable incompatible with Externalizable");
+ }
+
+ if ((model.serializable != osc.serializable) ||
+ (model.externalizable != osc.externalizable) ||
+ !(model.serializable || model.externalizable)) {
+ deserializeEx = new ExceptionInfo(
+ osc.name, "class invalid for deserialization");
+ }
+ }
+ }
+
+ this.cl = cl;
+ this.resolveEx = resolveEx;
+ this.superDesc = superDesc;
+ name = model.name;
+ this.suid = suid;
+ isProxy = false;
+ isEnum = model.isEnum;
+ serializable = model.serializable;
+ externalizable = model.externalizable;
+ hasBlockExternalData = model.hasBlockExternalData;
+ hasWriteObjectData = model.hasWriteObjectData;
+ fields = model.fields;
+ primDataSize = model.primDataSize;
+ numObjFields = model.numObjFields;
+
+ if (osc != null) {
+ localDesc = osc;
+ writeObjectMethod = localDesc.writeObjectMethod;
+ readObjectMethod = localDesc.readObjectMethod;
+ readObjectNoDataMethod = localDesc.readObjectNoDataMethod;
+ writeReplaceMethod = localDesc.writeReplaceMethod;
+ readResolveMethod = localDesc.readResolveMethod;
+ if (deserializeEx == null) {
+ deserializeEx = localDesc.deserializeEx;
+ }
+ cons = localDesc.cons;
+ }
+
+ fieldRefl = getReflector(fields, localDesc);
+ // reassign to matched fields so as to reflect local unshared settings
+ fields = fieldRefl.getFields();
+ initialized = true;
+ }
+
+ /**
+ * Reads non-proxy class descriptor information from given input stream.
+ * The resulting class descriptor is not fully functional; it can only be
+ * used as input to the ObjectInputStream.resolveClass() and
+ * ObjectStreamClass.initNonProxy() methods.
+ */
+ void readNonProxy(ObjectInputStream in)
+ throws IOException, ClassNotFoundException
+ {
+ name = in.readUTF();
+ suid = Long.valueOf(in.readLong());
+ isProxy = false;
+
+ byte flags = in.readByte();
+ hasWriteObjectData =
+ ((flags & ObjectStreamConstants.SC_WRITE_METHOD) != 0);
+ hasBlockExternalData =
+ ((flags & ObjectStreamConstants.SC_BLOCK_DATA) != 0);
+ externalizable =
+ ((flags & ObjectStreamConstants.SC_EXTERNALIZABLE) != 0);
+ boolean sflag =
+ ((flags & ObjectStreamConstants.SC_SERIALIZABLE) != 0);
+ if (externalizable && sflag) {
+ throw new InvalidClassException(
+ name, "serializable and externalizable flags conflict");
+ }
+ serializable = externalizable || sflag;
+ isEnum = ((flags & ObjectStreamConstants.SC_ENUM) != 0);
+ if (isEnum && suid.longValue() != 0L) {
+ throw new InvalidClassException(name,
+ "enum descriptor has non-zero serialVersionUID: " + suid);
+ }
+
+ int numFields = in.readShort();
+ if (isEnum && numFields != 0) {
+ throw new InvalidClassException(name,
+ "enum descriptor has non-zero field count: " + numFields);
+ }
+ fields = (numFields > 0) ?
+ new ObjectStreamField[numFields] : NO_FIELDS;
+ for (int i = 0; i < numFields; i++) {
+ char tcode = (char) in.readByte();
+ String fname = in.readUTF();
+ String signature = ((tcode == 'L') || (tcode == '[')) ?
+ in.readTypeString() : new String(new char[] { tcode });
+ try {
+ fields[i] = new ObjectStreamField(fname, signature, false);
+ } catch (RuntimeException e) {
+ throw (IOException) new InvalidClassException(name,
+ "invalid descriptor for field " + fname).initCause(e);
+ }
+ }
+ computeFieldOffsets();
+ }
+
+ /**
+ * Writes non-proxy class descriptor information to given output stream.
+ */
+ void writeNonProxy(ObjectOutputStream out) throws IOException {
+ out.writeUTF(name);
+ out.writeLong(getSerialVersionUID());
+
+ byte flags = 0;
+ if (externalizable) {
+ flags |= ObjectStreamConstants.SC_EXTERNALIZABLE;
+ int protocol = out.getProtocolVersion();
+ if (protocol != ObjectStreamConstants.PROTOCOL_VERSION_1) {
+ flags |= ObjectStreamConstants.SC_BLOCK_DATA;
+ }
+ } else if (serializable) {
+ flags |= ObjectStreamConstants.SC_SERIALIZABLE;
+ }
+ if (hasWriteObjectData) {
+ flags |= ObjectStreamConstants.SC_WRITE_METHOD;
+ }
+ if (isEnum) {
+ flags |= ObjectStreamConstants.SC_ENUM;
+ }
+ out.writeByte(flags);
+
+ out.writeShort(fields.length);
+ for (int i = 0; i < fields.length; i++) {
+ ObjectStreamField f = fields[i];
+ out.writeByte(f.getTypeCode());
+ out.writeUTF(f.getName());
+ if (!f.isPrimitive()) {
+ out.writeTypeString(f.getTypeString());
+ }
+ }
+ }
+
+ /**
+ * Returns ClassNotFoundException (if any) thrown while attempting to
+ * resolve local class corresponding to this class descriptor.
+ */
+ ClassNotFoundException getResolveException() {
+ return resolveEx;
+ }
+
+ /**
+ * Throws InternalError if not initialized.
+ */
+ private final void requireInitialized() {
+ if (!initialized)
+ throw new InternalError("Unexpected call when not initialized");
+ }
+
+ /**
+ * Throws an InvalidClassException if object instances referencing this
+ * class descriptor should not be allowed to deserialize. This method does
+ * not apply to deserialization of enum constants.
+ */
+ void checkDeserialize() throws InvalidClassException {
+ requireInitialized();
+ if (deserializeEx != null) {
+ throw deserializeEx.newInvalidClassException();
+ }
+ }
+
+ /**
+ * Throws an InvalidClassException if objects whose class is represented by
+ * this descriptor should not be allowed to serialize. This method does
+ * not apply to serialization of enum constants.
+ */
+ void checkSerialize() throws InvalidClassException {
+ requireInitialized();
+ if (serializeEx != null) {
+ throw serializeEx.newInvalidClassException();
+ }
+ }
+
+ /**
+ * Throws an InvalidClassException if objects whose class is represented by
+ * this descriptor should not be permitted to use default serialization
+ * (e.g., if the class declares serializable fields that do not correspond
+ * to actual fields, and hence must use the GetField API). This method
+ * does not apply to deserialization of enum constants.
+ */
+ void checkDefaultSerialize() throws InvalidClassException {
+ requireInitialized();
+ if (defaultSerializeEx != null) {
+ throw defaultSerializeEx.newInvalidClassException();
+ }
+ }
+
+ /**
+ * Returns superclass descriptor. Note that on the receiving side, the
+ * superclass descriptor may be bound to a class that is not a superclass
+ * of the subclass descriptor's bound class.
+ */
+ ObjectStreamClass getSuperDesc() {
+ requireInitialized();
+ return superDesc;
+ }
+
+ /**
+ * Returns the "local" class descriptor for the class associated with this
+ * class descriptor (i.e., the result of
+ * ObjectStreamClass.lookup(this.forClass())) or null if there is no class
+ * associated with this descriptor.
+ */
+ ObjectStreamClass getLocalDesc() {
+ requireInitialized();
+ return localDesc;
+ }
+
+ /**
+ * Returns arrays of ObjectStreamFields representing the serializable
+ * fields of the represented class. If copy is true, a clone of this class
+ * descriptor's field array is returned, otherwise the array itself is
+ * returned.
+ */
+ ObjectStreamField[] getFields(boolean copy) {
+ return copy ? fields.clone() : fields;
+ }
+
+ /**
+ * Looks up a serializable field of the represented class by name and type.
+ * A specified type of null matches all types, Object.class matches all
+ * non-primitive types, and any other non-null type matches assignable
+ * types only. Returns matching field, or null if no match found.
+ */
+ ObjectStreamField getField(String name, Class<?> type) {
+ for (int i = 0; i < fields.length; i++) {
+ ObjectStreamField f = fields[i];
+ if (f.getName().equals(name)) {
+ if (type == null ||
+ (type == Object.class && !f.isPrimitive()))
+ {
+ return f;
+ }
+ Class<?> ftype = f.getType();
+ if (ftype != null && type.isAssignableFrom(ftype)) {
+ return f;
+ }
+ }
+ }
+ return null;
+ }
+
+ /**
+ * Returns true if class descriptor represents a dynamic proxy class, false
+ * otherwise.
+ */
+ boolean isProxy() {
+ requireInitialized();
+ return isProxy;
+ }
+
+ /**
+ * Returns true if class descriptor represents an enum type, false
+ * otherwise.
+ */
+ boolean isEnum() {
+ requireInitialized();
+ return isEnum;
+ }
+
+ /**
+ * Returns true if represented class implements Externalizable, false
+ * otherwise.
+ */
+ boolean isExternalizable() {
+ requireInitialized();
+ return externalizable;
+ }
+
+ /**
+ * Returns true if represented class implements Serializable, false
+ * otherwise.
+ */
+ boolean isSerializable() {
+ requireInitialized();
+ return serializable;
+ }
+
+ /**
+ * Returns true if class descriptor represents externalizable class that
+ * has written its data in 1.2 (block data) format, false otherwise.
+ */
+ boolean hasBlockExternalData() {
+ requireInitialized();
+ return hasBlockExternalData;
+ }
+
+ /**
+ * Returns true if class descriptor represents serializable (but not
+ * externalizable) class which has written its data via a custom
+ * writeObject() method, false otherwise.
+ */
+ boolean hasWriteObjectData() {
+ requireInitialized();
+ return hasWriteObjectData;
+ }
+
+ /**
+ * Returns true if represented class is serializable/externalizable and can
+ * be instantiated by the serialization runtime--i.e., if it is
+ * externalizable and defines a public no-arg constructor, or if it is
+ * non-externalizable and its first non-serializable superclass defines an
+ * accessible no-arg constructor. Otherwise, returns false.
+ */
+ boolean isInstantiable() {
+ requireInitialized();
+ return (cons != null);
+ }
+
+ /**
+ * Returns true if represented class is serializable (but not
+ * externalizable) and defines a conformant writeObject method. Otherwise,
+ * returns false.
+ */
+ boolean hasWriteObjectMethod() {
+ requireInitialized();
+ return (writeObjectMethod != null);
+ }
+
+ /**
+ * Returns true if represented class is serializable (but not
+ * externalizable) and defines a conformant readObject method. Otherwise,
+ * returns false.
+ */
+ boolean hasReadObjectMethod() {
+ requireInitialized();
+ return (readObjectMethod != null);
+ }
+
+ /**
+ * Returns true if represented class is serializable (but not
+ * externalizable) and defines a conformant readObjectNoData method.
+ * Otherwise, returns false.
+ */
+ boolean hasReadObjectNoDataMethod() {
+ requireInitialized();
+ return (readObjectNoDataMethod != null);
+ }
+
+ /**
+ * Returns true if represented class is serializable or externalizable and
+ * defines a conformant writeReplace method. Otherwise, returns false.
+ */
+ boolean hasWriteReplaceMethod() {
+ requireInitialized();
+ return (writeReplaceMethod != null);
+ }
+
+ /**
+ * Returns true if represented class is serializable or externalizable and
+ * defines a conformant readResolve method. Otherwise, returns false.
+ */
+ boolean hasReadResolveMethod() {
+ requireInitialized();
+ return (readResolveMethod != null);
+ }
+
+ /**
+ * Creates a new instance of the represented class. If the class is
+ * externalizable, invokes its public no-arg constructor; otherwise, if the
+ * class is serializable, invokes the no-arg constructor of the first
+ * non-serializable superclass. Throws UnsupportedOperationException if
+ * this class descriptor is not associated with a class, if the associated
+ * class is non-serializable or if the appropriate no-arg constructor is
+ * inaccessible/unavailable.
+ */
+ Object newInstance()
+ throws InstantiationException, InvocationTargetException,
+ UnsupportedOperationException
+ {
+ requireInitialized();
+ if (cons != null) {
+ try {
+ return cons.newInstance();
+ } catch (IllegalAccessException ex) {
+ // should not occur, as access checks have been suppressed
+ throw new InternalError(ex);
+ }
+ } else {
+ throw new UnsupportedOperationException();
+ }
+ }
+
+ /**
+ * Invokes the writeObject method of the represented serializable class.
+ * Throws UnsupportedOperationException if this class descriptor is not
+ * associated with a class, or if the class is externalizable,
+ * non-serializable or does not define writeObject.
+ */
+ void invokeWriteObject(Object obj, ObjectOutputStream out)
+ throws IOException, UnsupportedOperationException
+ {
+ requireInitialized();
+ if (writeObjectMethod != null) {
+ try {
+ writeObjectMethod.invoke(obj, new Object[]{ out });
+ } catch (InvocationTargetException ex) {
+ Throwable th = ex.getTargetException();
+ if (th instanceof IOException) {
+ throw (IOException) th;
+ } else {
+ throwMiscException(th);
+ }
+ } catch (IllegalAccessException ex) {
+ // should not occur, as access checks have been suppressed
+ throw new InternalError(ex);
+ }
+ } else {
+ throw new UnsupportedOperationException();
+ }
+ }
+
+ /**
+ * Invokes the readObject method of the represented serializable class.
+ * Throws UnsupportedOperationException if this class descriptor is not
+ * associated with a class, or if the class is externalizable,
+ * non-serializable or does not define readObject.
+ */
+ void invokeReadObject(Object obj, ObjectInputStream in)
+ throws ClassNotFoundException, IOException,
+ UnsupportedOperationException
+ {
+ requireInitialized();
+ if (readObjectMethod != null) {
+ try {
+ readObjectMethod.invoke(obj, new Object[]{ in });
+ } catch (InvocationTargetException ex) {
+ Throwable th = ex.getTargetException();
+ if (th instanceof ClassNotFoundException) {
+ throw (ClassNotFoundException) th;
+ } else if (th instanceof IOException) {
+ throw (IOException) th;
+ } else {
+ throwMiscException(th);
+ }
+ } catch (IllegalAccessException ex) {
+ // should not occur, as access checks have been suppressed
+ throw new InternalError(ex);
+ }
+ } else {
+ throw new UnsupportedOperationException();
+ }
+ }
+
+ /**
+ * Invokes the readObjectNoData method of the represented serializable
+ * class. Throws UnsupportedOperationException if this class descriptor is
+ * not associated with a class, or if the class is externalizable,
+ * non-serializable or does not define readObjectNoData.
+ */
+ void invokeReadObjectNoData(Object obj)
+ throws IOException, UnsupportedOperationException
+ {
+ requireInitialized();
+ if (readObjectNoDataMethod != null) {
+ try {
+ readObjectNoDataMethod.invoke(obj, (Object[]) null);
+ } catch (InvocationTargetException ex) {
+ Throwable th = ex.getTargetException();
+ if (th instanceof ObjectStreamException) {
+ throw (ObjectStreamException) th;
+ } else {
+ throwMiscException(th);
+ }
+ } catch (IllegalAccessException ex) {
+ // should not occur, as access checks have been suppressed
+ throw new InternalError(ex);
+ }
+ } else {
+ throw new UnsupportedOperationException();
+ }
+ }
+
+ /**
+ * Invokes the writeReplace method of the represented serializable class and
+ * returns the result. Throws UnsupportedOperationException if this class
+ * descriptor is not associated with a class, or if the class is
+ * non-serializable or does not define writeReplace.
+ */
+ Object invokeWriteReplace(Object obj)
+ throws IOException, UnsupportedOperationException
+ {
+ requireInitialized();
+ if (writeReplaceMethod != null) {
+ try {
+ return writeReplaceMethod.invoke(obj, (Object[]) null);
+ } catch (InvocationTargetException ex) {
+ Throwable th = ex.getTargetException();
+ if (th instanceof ObjectStreamException) {
+ throw (ObjectStreamException) th;
+ } else {
+ throwMiscException(th);
+ throw new InternalError(th); // never reached
+ }
+ } catch (IllegalAccessException ex) {
+ // should not occur, as access checks have been suppressed
+ throw new InternalError(ex);
+ }
+ } else {
+ throw new UnsupportedOperationException();
+ }
+ }
+
+ /**
+ * Invokes the readResolve method of the represented serializable class and
+ * returns the result. Throws UnsupportedOperationException if this class
+ * descriptor is not associated with a class, or if the class is
+ * non-serializable or does not define readResolve.
+ */
+ Object invokeReadResolve(Object obj)
+ throws IOException, UnsupportedOperationException
+ {
+ requireInitialized();
+ if (readResolveMethod != null) {
+ try {
+ return readResolveMethod.invoke(obj, (Object[]) null);
+ } catch (InvocationTargetException ex) {
+ Throwable th = ex.getTargetException();
+ if (th instanceof ObjectStreamException) {
+ throw (ObjectStreamException) th;
+ } else {
+ throwMiscException(th);
+ throw new InternalError(th); // never reached
+ }
+ } catch (IllegalAccessException ex) {
+ // should not occur, as access checks have been suppressed
+ throw new InternalError(ex);
+ }
+ } else {
+ throw new UnsupportedOperationException();
+ }
+ }
+
+ /**
+ * Class representing the portion of an object's serialized form allotted
+ * to data described by a given class descriptor. If "hasData" is false,
+ * the object's serialized form does not contain data associated with the
+ * class descriptor.
+ */
+ static class ClassDataSlot {
+
+ /** class descriptor "occupying" this slot */
+ final ObjectStreamClass desc;
+ /** true if serialized form includes data for this slot's descriptor */
+ final boolean hasData;
+
+ ClassDataSlot(ObjectStreamClass desc, boolean hasData) {
+ this.desc = desc;
+ this.hasData = hasData;
+ }
+ }
+
+ /**
+ * Returns array of ClassDataSlot instances representing the data layout
+ * (including superclass data) for serialized objects described by this
+ * class descriptor. ClassDataSlots are ordered by inheritance with those
+ * containing "higher" superclasses appearing first. The final
+ * ClassDataSlot contains a reference to this descriptor.
+ */
+ ClassDataSlot[] getClassDataLayout() throws InvalidClassException {
+ // REMIND: synchronize instead of relying on volatile?
+ if (dataLayout == null) {
+ dataLayout = getClassDataLayout0();
+ }
+ return dataLayout;
+ }
+
+ private ClassDataSlot[] getClassDataLayout0()
+ throws InvalidClassException
+ {
+ ArrayList<ClassDataSlot> slots = new ArrayList<>();
+ Class<?> start = cl, end = cl;
+
+ // locate closest non-serializable superclass
+ while (end != null && Serializable.class.isAssignableFrom(end)) {
+ end = end.getSuperclass();
+ }
+
+ HashSet<String> oscNames = new HashSet<>(3);
+
+ for (ObjectStreamClass d = this; d != null; d = d.superDesc) {
+ if (oscNames.contains(d.name)) {
+ throw new InvalidClassException("Circular reference.");
+ } else {
+ oscNames.add(d.name);
+ }
+
+ // search up inheritance hierarchy for class with matching name
+ String searchName = (d.cl != null) ? d.cl.getName() : d.name;
+ Class<?> match = null;
+ for (Class<?> c = start; c != end; c = c.getSuperclass()) {
+ if (searchName.equals(c.getName())) {
+ match = c;
+ break;
+ }
+ }
+
+ // add "no data" slot for each unmatched class below match
+ if (match != null) {
+ for (Class<?> c = start; c != match; c = c.getSuperclass()) {
+ slots.add(new ClassDataSlot(
+ ObjectStreamClass.lookup(c, true), false));
+ }
+ start = match.getSuperclass();
+ }
+
+ // record descriptor/class pairing
+ slots.add(new ClassDataSlot(d.getVariantFor(match), true));
+ }
+
+ // add "no data" slot for any leftover unmatched classes
+ for (Class<?> c = start; c != end; c = c.getSuperclass()) {
+ slots.add(new ClassDataSlot(
+ ObjectStreamClass.lookup(c, true), false));
+ }
+
+ // order slots from superclass -> subclass
+ Collections.reverse(slots);
+ return slots.toArray(new ClassDataSlot[slots.size()]);
+ }
+
+ /**
+ * Returns aggregate size (in bytes) of marshalled primitive field values
+ * for represented class.
+ */
+ int getPrimDataSize() {
+ return primDataSize;
+ }
+
+ /**
+ * Returns number of non-primitive serializable fields of represented
+ * class.
+ */
+ int getNumObjFields() {
+ return numObjFields;
+ }
+
+ /**
+ * Fetches the serializable primitive field values of object obj and
+ * marshals them into byte array buf starting at offset 0. It is the
+ * responsibility of the caller to ensure that obj is of the proper type if
+ * non-null.
+ */
+ void getPrimFieldValues(Object obj, byte[] buf) {
+ fieldRefl.getPrimFieldValues(obj, buf);
+ }
+
+ /**
+ * Sets the serializable primitive fields of object obj using values
+ * unmarshalled from byte array buf starting at offset 0. It is the
+ * responsibility of the caller to ensure that obj is of the proper type if
+ * non-null.
+ */
+ void setPrimFieldValues(Object obj, byte[] buf) {
+ fieldRefl.setPrimFieldValues(obj, buf);
+ }
+
+ /**
+ * Fetches the serializable object field values of object obj and stores
+ * them in array vals starting at offset 0. It is the responsibility of
+ * the caller to ensure that obj is of the proper type if non-null.
+ */
+ void getObjFieldValues(Object obj, Object[] vals) {
+ fieldRefl.getObjFieldValues(obj, vals);
+ }
+
+ /**
+ * Checks that the given values, from array vals starting at offset 0,
+ * are assignable to the given serializable object fields.
+ * @throws ClassCastException if any value is not assignable
+ */
+ void checkObjFieldValueTypes(Object obj, Object[] vals) {
+ fieldRefl.checkObjectFieldValueTypes(obj, vals);
+ }
+
+ /**
+ * Sets the serializable object fields of object obj using values from
+ * array vals starting at offset 0. It is the responsibility of the caller
+ * to ensure that obj is of the proper type if non-null.
+ */
+ void setObjFieldValues(Object obj, Object[] vals) {
+ fieldRefl.setObjFieldValues(obj, vals);
+ }
+
+ /**
+ * Calculates and sets serializable field offsets, as well as primitive
+ * data size and object field count totals. Throws InvalidClassException
+ * if fields are illegally ordered.
+ */
+ private void computeFieldOffsets() throws InvalidClassException {
+ primDataSize = 0;
+ numObjFields = 0;
+ int firstObjIndex = -1;
+
+ for (int i = 0; i < fields.length; i++) {
+ ObjectStreamField f = fields[i];
+ switch (f.getTypeCode()) {
+ case 'Z':
+ case 'B':
+ f.setOffset(primDataSize++);
+ break;
+
+ case 'C':
+ case 'S':
+ f.setOffset(primDataSize);
+ primDataSize += 2;
+ break;
+
+ case 'I':
+ case 'F':
+ f.setOffset(primDataSize);
+ primDataSize += 4;
+ break;
+
+ case 'J':
+ case 'D':
+ f.setOffset(primDataSize);
+ primDataSize += 8;
+ break;
+
+ case '[':
+ case 'L':
+ f.setOffset(numObjFields++);
+ if (firstObjIndex == -1) {
+ firstObjIndex = i;
+ }
+ break;
+
+ default:
+ throw new InternalError();
+ }
+ }
+ if (firstObjIndex != -1 &&
+ firstObjIndex + numObjFields != fields.length)
+ {
+ throw new InvalidClassException(name, "illegal field order");
+ }
+ }
+
+ /**
+ * If given class is the same as the class associated with this class
+ * descriptor, returns reference to this class descriptor. Otherwise,
+ * returns variant of this class descriptor bound to given class.
+ */
+ private ObjectStreamClass getVariantFor(Class<?> cl)
+ throws InvalidClassException
+ {
+ if (this.cl == cl) {
+ return this;
+ }
+ ObjectStreamClass desc = new ObjectStreamClass();
+ if (isProxy) {
+ desc.initProxy(cl, null, superDesc);
+ } else {
+ desc.initNonProxy(this, cl, null, superDesc);
+ }
+ return desc;
+ }
+
+ /**
+ * Returns public no-arg constructor of given class, or null if none found.
+ * Access checks are disabled on the returned constructor (if any), since
+ * the defining class may still be non-public.
+ */
+ private static Constructor<?> getExternalizableConstructor(Class<?> cl) {
+ try {
+ Constructor<?> cons = cl.getDeclaredConstructor((Class<?>[]) null);
+ cons.setAccessible(true);
+ return ((cons.getModifiers() & Modifier.PUBLIC) != 0) ?
+ cons : null;
+ } catch (NoSuchMethodException ex) {
+ return null;
+ }
+ }
+
+ /**
+ * Returns subclass-accessible no-arg constructor of first non-serializable
+ * superclass, or null if none found. Access checks are disabled on the
+ * returned constructor (if any).
+ */
+ private static Constructor<?> getSerializableConstructor(Class<?> cl) {
+ return reflFactory.newConstructorForSerialization(cl);
+ }
+
+ /**
+ * Returns non-static, non-abstract method with given signature provided it
+ * is defined by or accessible (via inheritance) by the given class, or
+ * null if no match found. Access checks are disabled on the returned
+ * method (if any).
+ */
+ private static Method getInheritableMethod(Class<?> cl, String name,
+ Class<?>[] argTypes,
+ Class<?> returnType)
+ {
+ Method meth = null;
+ Class<?> defCl = cl;
+ while (defCl != null) {
+ try {
+ meth = defCl.getDeclaredMethod(name, argTypes);
+ break;
+ } catch (NoSuchMethodException ex) {
+ defCl = defCl.getSuperclass();
+ }
+ }
+
+ if ((meth == null) || (meth.getReturnType() != returnType)) {
+ return null;
+ }
+ meth.setAccessible(true);
+ int mods = meth.getModifiers();
+ if ((mods & (Modifier.STATIC | Modifier.ABSTRACT)) != 0) {
+ return null;
+ } else if ((mods & (Modifier.PUBLIC | Modifier.PROTECTED)) != 0) {
+ return meth;
+ } else if ((mods & Modifier.PRIVATE) != 0) {
+ return (cl == defCl) ? meth : null;
+ } else {
+ return packageEquals(cl, defCl) ? meth : null;
+ }
+ }
+
+ /**
+ * Returns non-static private method with given signature defined by given
+ * class, or null if none found. Access checks are disabled on the
+ * returned method (if any).
+ */
+ private static Method getPrivateMethod(Class<?> cl, String name,
+ Class<?>[] argTypes,
+ Class<?> returnType)
+ {
+ try {
+ Method meth = cl.getDeclaredMethod(name, argTypes);
+ meth.setAccessible(true);
+ int mods = meth.getModifiers();
+ return ((meth.getReturnType() == returnType) &&
+ ((mods & Modifier.STATIC) == 0) &&
+ ((mods & Modifier.PRIVATE) != 0)) ? meth : null;
+ } catch (NoSuchMethodException ex) {
+ return null;
+ }
+ }
+
+ /**
+ * Returns true if classes are defined in the same runtime package, false
+ * otherwise.
+ */
+ private static boolean packageEquals(Class<?> cl1, Class<?> cl2) {
+ return (cl1.getClassLoader() == cl2.getClassLoader() &&
+ getPackageName(cl1).equals(getPackageName(cl2)));
+ }
+
+ /**
+ * Returns package name of given class.
+ */
+ private static String getPackageName(Class<?> cl) {
+ String s = cl.getName();
+ int i = s.lastIndexOf('[');
+ i = (i < 0) ? 0 : i + 2;
+ int j = s.lastIndexOf('.');
+ return (i < j) ? s.substring(i, j) : "";
+ }
+
+ /**
+ * Compares class names for equality, ignoring package names. Returns true
+ * if class names equal, false otherwise.
+ */
+ private static boolean classNamesEqual(String name1, String name2) {
+ int idx1 = name1.lastIndexOf('.') + 1;
+ int idx2 = name2.lastIndexOf('.') + 1;
+ int len1 = name1.length() - idx1;
+ int len2 = name2.length() - idx2;
+ return len1 == len2 &&
+ name1.regionMatches(idx1, name2, idx2, len1);
+ }
+
+ /**
+ * Returns JVM type signature for given list of parameters and return type.
+ */
+ private static String getMethodSignature(Class<?>[] paramTypes,
+ Class<?> retType)
+ {
+ StringBuilder sb = new StringBuilder();
+ sb.append('(');
+ for (int i = 0; i < paramTypes.length; i++) {
+ appendClassSignature(sb, paramTypes[i]);
+ }
+ sb.append(')');
+ appendClassSignature(sb, retType);
+ return sb.toString();
+ }
+
+ /**
+ * Convenience method for throwing an exception that is either a
+ * RuntimeException, Error, or of some unexpected type (in which case it is
+ * wrapped inside an IOException).
+ */
+ private static void throwMiscException(Throwable th) throws IOException {
+ if (th instanceof RuntimeException) {
+ throw (RuntimeException) th;
+ } else if (th instanceof Error) {
+ throw (Error) th;
+ } else {
+ IOException ex = new IOException("unexpected exception type");
+ ex.initCause(th);
+ throw ex;
+ }
+ }
+
+ /**
+ * Returns ObjectStreamField array describing the serializable fields of
+ * the given class. Serializable fields backed by an actual field of the
+ * class are represented by ObjectStreamFields with corresponding non-null
+ * Field objects. Throws InvalidClassException if the (explicitly
+ * declared) serializable fields are invalid.
+ */
+ private static ObjectStreamField[] getSerialFields(Class<?> cl)
+ throws InvalidClassException
+ {
+ ObjectStreamField[] fields;
+ if (Serializable.class.isAssignableFrom(cl) &&
+ !Externalizable.class.isAssignableFrom(cl) &&
+ !Proxy.isProxyClass(cl) &&
+ !cl.isInterface())
+ {
+ if ((fields = getDeclaredSerialFields(cl)) == null) {
+ fields = getDefaultSerialFields(cl);
+ }
+ Arrays.sort(fields);
+ } else {
+ fields = NO_FIELDS;
+ }
+ return fields;
+ }
+
+ /**
+ * Returns serializable fields of given class as defined explicitly by a
+ * "serialPersistentFields" field, or null if no appropriate
+ * "serialPersistentFields" field is defined. Serializable fields backed
+ * by an actual field of the class are represented by ObjectStreamFields
+ * with corresponding non-null Field objects. For compatibility with past
+ * releases, a "serialPersistentFields" field with a null value is
+ * considered equivalent to not declaring "serialPersistentFields". Throws
+ * InvalidClassException if the declared serializable fields are
+ * invalid--e.g., if multiple fields share the same name.
+ */
+ private static ObjectStreamField[] getDeclaredSerialFields(Class<?> cl)
+ throws InvalidClassException
+ {
+ ObjectStreamField[] serialPersistentFields = null;
+ try {
+ Field f = cl.getDeclaredField("serialPersistentFields");
+ int mask = Modifier.PRIVATE | Modifier.STATIC | Modifier.FINAL;
+ if ((f.getModifiers() & mask) == mask) {
+ f.setAccessible(true);
+ serialPersistentFields = (ObjectStreamField[]) f.get(null);
+ }
+ } catch (Exception ex) {
+ }
+ if (serialPersistentFields == null) {
+ return null;
+ } else if (serialPersistentFields.length == 0) {
+ return NO_FIELDS;
+ }
+
+ ObjectStreamField[] boundFields =
+ new ObjectStreamField[serialPersistentFields.length];
+ Set<String> fieldNames = new HashSet<>(serialPersistentFields.length);
+
+ for (int i = 0; i < serialPersistentFields.length; i++) {
+ ObjectStreamField spf = serialPersistentFields[i];
+
+ String fname = spf.getName();
+ if (fieldNames.contains(fname)) {
+ throw new InvalidClassException(
+ "multiple serializable fields named " + fname);
+ }
+ fieldNames.add(fname);
+
+ try {
+ Field f = cl.getDeclaredField(fname);
+ if ((f.getType() == spf.getType()) &&
+ ((f.getModifiers() & Modifier.STATIC) == 0))
+ {
+ boundFields[i] =
+ new ObjectStreamField(f, spf.isUnshared(), true);
+ }
+ } catch (NoSuchFieldException ex) {
+ }
+ if (boundFields[i] == null) {
+ boundFields[i] = new ObjectStreamField(
+ fname, spf.getType(), spf.isUnshared());
+ }
+ }
+ return boundFields;
+ }
+
+ /**
+ * Returns array of ObjectStreamFields corresponding to all non-static
+ * non-transient fields declared by given class. Each ObjectStreamField
+ * contains a Field object for the field it represents. If no default
+ * serializable fields exist, NO_FIELDS is returned.
+ */
+ private static ObjectStreamField[] getDefaultSerialFields(Class<?> cl) {
+ Field[] clFields = cl.getDeclaredFields();
+ ArrayList<ObjectStreamField> list = new ArrayList<>();
+ int mask = Modifier.STATIC | Modifier.TRANSIENT;
+
+ for (int i = 0; i < clFields.length; i++) {
+ if ((clFields[i].getModifiers() & mask) == 0) {
+ list.add(new ObjectStreamField(clFields[i], false, true));
+ }
+ }
+ int size = list.size();
+ return (size == 0) ? NO_FIELDS :
+ list.toArray(new ObjectStreamField[size]);
+ }
+
+ /**
+ * Returns explicit serial version UID value declared by given class, or
+ * null if none.
+ */
+ private static Long getDeclaredSUID(Class<?> cl) {
+ try {
+ Field f = cl.getDeclaredField("serialVersionUID");
+ int mask = Modifier.STATIC | Modifier.FINAL;
+ if ((f.getModifiers() & mask) == mask) {
+ f.setAccessible(true);
+ return Long.valueOf(f.getLong(null));
+ }
+ } catch (Exception ex) {
+ }
+ return null;
+ }
+
+ /**
+ * Computes the default serial version UID value for the given class.
+ */
+ private static long computeDefaultSUID(Class<?> cl) {
+ if (!Serializable.class.isAssignableFrom(cl) || Proxy.isProxyClass(cl))
+ {
+ return 0L;
+ }
+
+ try {
+ ByteArrayOutputStream bout = new ByteArrayOutputStream();
+ DataOutputStream dout = new DataOutputStream(bout);
+
+ dout.writeUTF(cl.getName());
+
+ int classMods = cl.getModifiers() &
+ (Modifier.PUBLIC | Modifier.FINAL |
+ Modifier.INTERFACE | Modifier.ABSTRACT);
+
+ /*
+ * compensate for javac bug in which ABSTRACT bit was set for an
+ * interface only if the interface declared methods
+ */
+ Method[] methods = cl.getDeclaredMethods();
+ if ((classMods & Modifier.INTERFACE) != 0) {
+ classMods = (methods.length > 0) ?
+ (classMods | Modifier.ABSTRACT) :
+ (classMods & ~Modifier.ABSTRACT);
+ }
+ dout.writeInt(classMods);
+
+ if (!cl.isArray()) {
+ /*
+ * compensate for change in 1.2FCS in which
+ * Class.getInterfaces() was modified to return Cloneable and
+ * Serializable for array classes.
+ */
+ Class<?>[] interfaces = cl.getInterfaces();
+ String[] ifaceNames = new String[interfaces.length];
+ for (int i = 0; i < interfaces.length; i++) {
+ ifaceNames[i] = interfaces[i].getName();
+ }
+ Arrays.sort(ifaceNames);
+ for (int i = 0; i < ifaceNames.length; i++) {
+ dout.writeUTF(ifaceNames[i]);
+ }
+ }
+
+ Field[] fields = cl.getDeclaredFields();
+ MemberSignature[] fieldSigs = new MemberSignature[fields.length];
+ for (int i = 0; i < fields.length; i++) {
+ fieldSigs[i] = new MemberSignature(fields[i]);
+ }
+ Arrays.sort(fieldSigs, new Comparator<>() {
+ public int compare(MemberSignature ms1, MemberSignature ms2) {
+ return ms1.name.compareTo(ms2.name);
+ }
+ });
+ for (int i = 0; i < fieldSigs.length; i++) {
+ MemberSignature sig = fieldSigs[i];
+ int mods = sig.member.getModifiers() &
+ (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED |
+ Modifier.STATIC | Modifier.FINAL | Modifier.VOLATILE |
+ Modifier.TRANSIENT);
+ if (((mods & Modifier.PRIVATE) == 0) ||
+ ((mods & (Modifier.STATIC | Modifier.TRANSIENT)) == 0))
+ {
+ dout.writeUTF(sig.name);
+ dout.writeInt(mods);
+ dout.writeUTF(sig.signature);
+ }
+ }
+
+ if (hasStaticInitializer(cl)) {
+ dout.writeUTF("<clinit>");
+ dout.writeInt(Modifier.STATIC);
+ dout.writeUTF("()V");
+ }
+
+ Constructor<?>[] cons = cl.getDeclaredConstructors();
+ MemberSignature[] consSigs = new MemberSignature[cons.length];
+ for (int i = 0; i < cons.length; i++) {
+ consSigs[i] = new MemberSignature(cons[i]);
+ }
+ Arrays.sort(consSigs, new Comparator<>() {
+ public int compare(MemberSignature ms1, MemberSignature ms2) {
+ return ms1.signature.compareTo(ms2.signature);
+ }
+ });
+ for (int i = 0; i < consSigs.length; i++) {
+ MemberSignature sig = consSigs[i];
+ int mods = sig.member.getModifiers() &
+ (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED |
+ Modifier.STATIC | Modifier.FINAL |
+ Modifier.SYNCHRONIZED | Modifier.NATIVE |
+ Modifier.ABSTRACT | Modifier.STRICT);
+ if ((mods & Modifier.PRIVATE) == 0) {
+ dout.writeUTF("<init>");
+ dout.writeInt(mods);
+ dout.writeUTF(sig.signature.replace('/', '.'));
+ }
+ }
+
+ MemberSignature[] methSigs = new MemberSignature[methods.length];
+ for (int i = 0; i < methods.length; i++) {
+ methSigs[i] = new MemberSignature(methods[i]);
+ }
+ Arrays.sort(methSigs, new Comparator<>() {
+ public int compare(MemberSignature ms1, MemberSignature ms2) {
+ int comp = ms1.name.compareTo(ms2.name);
+ if (comp == 0) {
+ comp = ms1.signature.compareTo(ms2.signature);
+ }
+ return comp;
+ }
+ });
+ for (int i = 0; i < methSigs.length; i++) {
+ MemberSignature sig = methSigs[i];
+ int mods = sig.member.getModifiers() &
+ (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED |
+ Modifier.STATIC | Modifier.FINAL |
+ Modifier.SYNCHRONIZED | Modifier.NATIVE |
+ Modifier.ABSTRACT | Modifier.STRICT);
+ if ((mods & Modifier.PRIVATE) == 0) {
+ dout.writeUTF(sig.name);
+ dout.writeInt(mods);
+ dout.writeUTF(sig.signature.replace('/', '.'));
+ }
+ }
+
+ dout.flush();
+
+ MessageDigest md = MessageDigest.getInstance("SHA");
+ byte[] hashBytes = md.digest(bout.toByteArray());
+ long hash = 0;
+ for (int i = Math.min(hashBytes.length, 8) - 1; i >= 0; i--) {
+ hash = (hash << 8) | (hashBytes[i] & 0xFF);
+ }
+ return hash;
+ } catch (IOException ex) {
+ throw new InternalError(ex);
+ } catch (NoSuchAlgorithmException ex) {
+ throw new SecurityException(ex.getMessage());
+ }
+ }
+
+ /**
+ * Returns true if the given class defines a static initializer method,
+ * false otherwise.
+ */
+ private static native boolean hasStaticInitializer(Class<?> cl);
+
+ /**
+ * Class for computing and caching field/constructor/method signatures
+ * during serialVersionUID calculation.
+ */
+ private static class MemberSignature {
+
+ public final Member member;
+ public final String name;
+ public final String signature;
+
+ public MemberSignature(Field field) {
+ member = field;
+ name = field.getName();
+ signature = getClassSignature(field.getType());
+ }
+
+ public MemberSignature(Constructor<?> cons) {
+ member = cons;
+ name = cons.getName();
+ signature = getMethodSignature(
+ cons.getParameterTypes(), Void.TYPE);
+ }
+
+ public MemberSignature(Method meth) {
+ member = meth;
+ name = meth.getName();
+ signature = getMethodSignature(
+ meth.getParameterTypes(), meth.getReturnType());
+ }
+ }
+
+ /**
+ * Class for setting and retrieving serializable field values in batch.
+ */
+ // REMIND: dynamically generate these?
+ private static class FieldReflector {
+
+ /** handle for performing unsafe operations */
+ private static final Unsafe unsafe = Unsafe.getUnsafe();
+
+ /** fields to operate on */
+ private final ObjectStreamField[] fields;
+ /** number of primitive fields */
+ private final int numPrimFields;
+ /** unsafe field keys for reading fields - may contain dupes */
+ private final long[] readKeys;
+ /** unsafe fields keys for writing fields - no dupes */
+ private final long[] writeKeys;
+ /** field data offsets */
+ private final int[] offsets;
+ /** field type codes */
+ private final char[] typeCodes;
+ /** field types */
+ private final Class<?>[] types;
+
+ /**
+ * Constructs FieldReflector capable of setting/getting values from the
+ * subset of fields whose ObjectStreamFields contain non-null
+ * reflective Field objects. ObjectStreamFields with null Fields are
+ * treated as filler, for which get operations return default values
+ * and set operations discard given values.
+ */
+ FieldReflector(ObjectStreamField[] fields) {
+ this.fields = fields;
+ int nfields = fields.length;
+ readKeys = new long[nfields];
+ writeKeys = new long[nfields];
+ offsets = new int[nfields];
+ typeCodes = new char[nfields];
+ ArrayList<Class<?>> typeList = new ArrayList<>();
+ Set<Long> usedKeys = new HashSet<>();
+
+
+ for (int i = 0; i < nfields; i++) {
+ ObjectStreamField f = fields[i];
+ Field rf = f.getField();
+ long key = (rf != null) ?
+ unsafe.objectFieldOffset(rf) : Unsafe.INVALID_FIELD_OFFSET;
+ readKeys[i] = key;
+ writeKeys[i] = usedKeys.add(key) ?
+ key : Unsafe.INVALID_FIELD_OFFSET;
+ offsets[i] = f.getOffset();
+ typeCodes[i] = f.getTypeCode();
+ if (!f.isPrimitive()) {
+ typeList.add((rf != null) ? rf.getType() : null);
+ }
+ }
+
+ types = typeList.toArray(new Class<?>[typeList.size()]);
+ numPrimFields = nfields - types.length;
+ }
+
+ /**
+ * Returns list of ObjectStreamFields representing fields operated on
+ * by this reflector. The shared/unshared values and Field objects
+ * contained by ObjectStreamFields in the list reflect their bindings
+ * to locally defined serializable fields.
+ */
+ ObjectStreamField[] getFields() {
+ return fields;
+ }
+
+ /**
+ * Fetches the serializable primitive field values of object obj and
+ * marshals them into byte array buf starting at offset 0. The caller
+ * is responsible for ensuring that obj is of the proper type.
+ */
+ void getPrimFieldValues(Object obj, byte[] buf) {
+ if (obj == null) {
+ throw new NullPointerException();
+ }
+ /* assuming checkDefaultSerialize() has been called on the class
+ * descriptor this FieldReflector was obtained from, no field keys
+ * in array should be equal to Unsafe.INVALID_FIELD_OFFSET.
+ */
+ for (int i = 0; i < numPrimFields; i++) {
+ long key = readKeys[i];
+ int off = offsets[i];
+ switch (typeCodes[i]) {
+ case 'Z':
+ Bits.putBoolean(buf, off, unsafe.getBoolean(obj, key));
+ break;
+
+ case 'B':
+ buf[off] = unsafe.getByte(obj, key);
+ break;
+
+ case 'C':
+ Bits.putChar(buf, off, unsafe.getChar(obj, key));
+ break;
+
+ case 'S':
+ Bits.putShort(buf, off, unsafe.getShort(obj, key));
+ break;
+
+ case 'I':
+ Bits.putInt(buf, off, unsafe.getInt(obj, key));
+ break;
+
+ case 'F':
+ Bits.putFloat(buf, off, unsafe.getFloat(obj, key));
+ break;
+
+ case 'J':
+ Bits.putLong(buf, off, unsafe.getLong(obj, key));
+ break;
+
+ case 'D':
+ Bits.putDouble(buf, off, unsafe.getDouble(obj, key));
+ break;
+
+ default:
+ throw new InternalError();
+ }
+ }
+ }
+
+ /**
+ * Sets the serializable primitive fields of object obj using values
+ * unmarshalled from byte array buf starting at offset 0. The caller
+ * is responsible for ensuring that obj is of the proper type.
+ */
+ void setPrimFieldValues(Object obj, byte[] buf) {
+ if (obj == null) {
+ throw new NullPointerException();
+ }
+ for (int i = 0; i < numPrimFields; i++) {
+ long key = writeKeys[i];
+ if (key == Unsafe.INVALID_FIELD_OFFSET) {
+ continue; // discard value
+ }
+ int off = offsets[i];
+ switch (typeCodes[i]) {
+ case 'Z':
+ unsafe.putBoolean(obj, key, Bits.getBoolean(buf, off));
+ break;
+
+ case 'B':
+ unsafe.putByte(obj, key, buf[off]);
+ break;
+
+ case 'C':
+ unsafe.putChar(obj, key, Bits.getChar(buf, off));
+ break;
+
+ case 'S':
+ unsafe.putShort(obj, key, Bits.getShort(buf, off));
+ break;
+
+ case 'I':
+ unsafe.putInt(obj, key, Bits.getInt(buf, off));
+ break;
+
+ case 'F':
+ unsafe.putFloat(obj, key, Bits.getFloat(buf, off));
+ break;
+
+ case 'J':
+ unsafe.putLong(obj, key, Bits.getLong(buf, off));
+ break;
+
+ case 'D':
+ unsafe.putDouble(obj, key, Bits.getDouble(buf, off));
+ break;
+
+ default:
+ throw new InternalError();
+ }
+ }
+ }
+
+ /**
+ * Fetches the serializable object field values of object obj and
+ * stores them in array vals starting at offset 0. The caller is
+ * responsible for ensuring that obj is of the proper type.
+ */
+ void getObjFieldValues(Object obj, Object[] vals) {
+ if (obj == null) {
+ throw new NullPointerException();
+ }
+ /* assuming checkDefaultSerialize() has been called on the class
+ * descriptor this FieldReflector was obtained from, no field keys
+ * in array should be equal to Unsafe.INVALID_FIELD_OFFSET.
+ */
+ for (int i = numPrimFields; i < fields.length; i++) {
+ switch (typeCodes[i]) {
+ case 'L':
+ case '[':
+ vals[offsets[i]] = unsafe.getObject(obj, readKeys[i]);
+ break;
+
+ default:
+ throw new InternalError();
+ }
+ }
+ }
+
+ /**
+ * Checks that the given values, from array vals starting at offset 0,
+ * are assignable to the given serializable object fields.
+ * @throws ClassCastException if any value is not assignable
+ */
+ void checkObjectFieldValueTypes(Object obj, Object[] vals) {
+ setObjFieldValues(obj, vals, true);
+ }
+
+ /**
+ * Sets the serializable object fields of object obj using values from
+ * array vals starting at offset 0. The caller is responsible for
+ * ensuring that obj is of the proper type; however, attempts to set a
+ * field with a value of the wrong type will trigger an appropriate
+ * ClassCastException.
+ */
+ void setObjFieldValues(Object obj, Object[] vals) {
+ setObjFieldValues(obj, vals, false);
+ }
+
+ private void setObjFieldValues(Object obj, Object[] vals, boolean dryRun) {
+ if (obj == null) {
+ throw new NullPointerException();
+ }
+ for (int i = numPrimFields; i < fields.length; i++) {
+ long key = writeKeys[i];
+ if (key == Unsafe.INVALID_FIELD_OFFSET) {
+ continue; // discard value
+ }
+ switch (typeCodes[i]) {
+ case 'L':
+ case '[':
+ Object val = vals[offsets[i]];
+ if (val != null &&
+ !types[i - numPrimFields].isInstance(val))
+ {
+ Field f = fields[i].getField();
+ throw new ClassCastException(
+ "cannot assign instance of " +
+ val.getClass().getName() + " to field " +
+ f.getDeclaringClass().getName() + "." +
+ f.getName() + " of type " +
+ f.getType().getName() + " in instance of " +
+ obj.getClass().getName());
+ }
+ if (!dryRun)
+ unsafe.putObject(obj, key, val);
+ break;
+
+ default:
+ throw new InternalError();
+ }
+ }
+ }
+ }
+
+ /**
+ * Matches given set of serializable fields with serializable fields
+ * described by the given local class descriptor, and returns a
+ * FieldReflector instance capable of setting/getting values from the
+ * subset of fields that match (non-matching fields are treated as filler,
+ * for which get operations return default values and set operations
+ * discard given values). Throws InvalidClassException if unresolvable
+ * type conflicts exist between the two sets of fields.
+ */
+ private static FieldReflector getReflector(ObjectStreamField[] fields,
+ ObjectStreamClass localDesc)
+ throws InvalidClassException
+ {
+ // class irrelevant if no fields
+ Class<?> cl = (localDesc != null && fields.length > 0) ?
+ localDesc.cl : null;
+ processQueue(Caches.reflectorsQueue, Caches.reflectors);
+ FieldReflectorKey key = new FieldReflectorKey(cl, fields,
+ Caches.reflectorsQueue);
+ Reference<?> ref = Caches.reflectors.get(key);
+ Object entry = null;
+ if (ref != null) {
+ entry = ref.get();
+ }
+ EntryFuture future = null;
+ if (entry == null) {
+ EntryFuture newEntry = new EntryFuture();
+ Reference<?> newRef = new SoftReference<>(newEntry);
+ do {
+ if (ref != null) {
+ Caches.reflectors.remove(key, ref);
+ }
+ ref = Caches.reflectors.putIfAbsent(key, newRef);
+ if (ref != null) {
+ entry = ref.get();
+ }
+ } while (ref != null && entry == null);
+ if (entry == null) {
+ future = newEntry;
+ }
+ }
+
+ if (entry instanceof FieldReflector) { // check common case first
+ return (FieldReflector) entry;
+ } else if (entry instanceof EntryFuture) {
+ entry = ((EntryFuture) entry).get();
+ } else if (entry == null) {
+ try {
+ entry = new FieldReflector(matchFields(fields, localDesc));
+ } catch (Throwable th) {
+ entry = th;
+ }
+ future.set(entry);
+ Caches.reflectors.put(key, new SoftReference<>(entry));
+ }
+
+ if (entry instanceof FieldReflector) {
+ return (FieldReflector) entry;
+ } else if (entry instanceof InvalidClassException) {
+ throw (InvalidClassException) entry;
+ } else if (entry instanceof RuntimeException) {
+ throw (RuntimeException) entry;
+ } else if (entry instanceof Error) {
+ throw (Error) entry;
+ } else {
+ throw new InternalError("unexpected entry: " + entry);
+ }
+ }
+
+ /**
+ * FieldReflector cache lookup key. Keys are considered equal if they
+ * refer to the same class and equivalent field formats.
+ */
+ private static class FieldReflectorKey extends WeakReference<Class<?>> {
+
+ private final String sigs;
+ private final int hash;
+ private final boolean nullClass;
+
+ FieldReflectorKey(Class<?> cl, ObjectStreamField[] fields,
+ ReferenceQueue<Class<?>> queue)
+ {
+ super(cl, queue);
+ nullClass = (cl == null);
+ StringBuilder sbuf = new StringBuilder();
+ for (int i = 0; i < fields.length; i++) {
+ ObjectStreamField f = fields[i];
+ sbuf.append(f.getName()).append(f.getSignature());
+ }
+ sigs = sbuf.toString();
+ hash = System.identityHashCode(cl) + sigs.hashCode();
+ }
+
+ public int hashCode() {
+ return hash;
+ }
+
+ public boolean equals(Object obj) {
+ if (obj == this) {
+ return true;
+ }
+
+ if (obj instanceof FieldReflectorKey) {
+ FieldReflectorKey other = (FieldReflectorKey) obj;
+ Class<?> referent;
+ return (nullClass ? other.nullClass
+ : ((referent = get()) != null) &&
+ (referent == other.get())) &&
+ sigs.equals(other.sigs);
+ } else {
+ return false;
+ }
+ }
+ }
+
+ /**
+ * Matches given set of serializable fields with serializable fields
+ * obtained from the given local class descriptor (which contain bindings
+ * to reflective Field objects). Returns list of ObjectStreamFields in
+ * which each ObjectStreamField whose signature matches that of a local
+ * field contains a Field object for that field; unmatched
+ * ObjectStreamFields contain null Field objects. Shared/unshared settings
+ * of the returned ObjectStreamFields also reflect those of matched local
+ * ObjectStreamFields. Throws InvalidClassException if unresolvable type
+ * conflicts exist between the two sets of fields.
+ */
+ private static ObjectStreamField[] matchFields(ObjectStreamField[] fields,
+ ObjectStreamClass localDesc)
+ throws InvalidClassException
+ {
+ ObjectStreamField[] localFields = (localDesc != null) ?
+ localDesc.fields : NO_FIELDS;
+
+ /*
+ * Even if fields == localFields, we cannot simply return localFields
+ * here. In previous implementations of serialization,
+ * ObjectStreamField.getType() returned Object.class if the
+ * ObjectStreamField represented a non-primitive field and belonged to
+ * a non-local class descriptor. To preserve this (questionable)
+ * behavior, the ObjectStreamField instances returned by matchFields
+ * cannot report non-primitive types other than Object.class; hence
+ * localFields cannot be returned directly.
+ */
+
+ ObjectStreamField[] matches = new ObjectStreamField[fields.length];
+ for (int i = 0; i < fields.length; i++) {
+ ObjectStreamField f = fields[i], m = null;
+ for (int j = 0; j < localFields.length; j++) {
+ ObjectStreamField lf = localFields[j];
+ if (f.getName().equals(lf.getName())) {
+ if ((f.isPrimitive() || lf.isPrimitive()) &&
+ f.getTypeCode() != lf.getTypeCode())
+ {
+ throw new InvalidClassException(localDesc.name,
+ "incompatible types for field " + f.getName());
+ }
+ if (lf.getField() != null) {
+ m = new ObjectStreamField(
+ lf.getField(), lf.isUnshared(), false);
+ } else {
+ m = new ObjectStreamField(
+ lf.getName(), lf.getSignature(), lf.isUnshared());
+ }
+ }
+ }
+ if (m == null) {
+ m = new ObjectStreamField(
+ f.getName(), f.getSignature(), false);
+ }
+ m.setOffset(f.getOffset());
+ matches[i] = m;
+ }
+ return matches;
+ }
+
+ /**
+ * Removes from the specified map any keys that have been enqueued
+ * on the specified reference queue.
+ */
+ static void processQueue(ReferenceQueue<Class<?>> queue,
+ ConcurrentMap<? extends
+ WeakReference<Class<?>>, ?> map)
+ {
+ Reference<? extends Class<?>> ref;
+ while((ref = queue.poll()) != null) {
+ map.remove(ref);
+ }
+ }
+
+ /**
+ * Weak key for Class objects.
+ *
+ **/
+ static class WeakClassKey extends WeakReference<Class<?>> {
+ /**
+ * saved value of the referent's identity hash code, to maintain
+ * a consistent hash code after the referent has been cleared
+ */
+ private final int hash;
+
+ /**
+ * Create a new WeakClassKey to the given object, registered
+ * with a queue.
+ */
+ WeakClassKey(Class<?> cl, ReferenceQueue<Class<?>> refQueue) {
+ super(cl, refQueue);
+ hash = System.identityHashCode(cl);
+ }
+
+ /**
+ * Returns the identity hash code of the original referent.
+ */
+ public int hashCode() {
+ return hash;
+ }
+
+ /**
+ * Returns true if the given object is this identical
+ * WeakClassKey instance, or, if this object's referent has not
+ * been cleared, if the given object is another WeakClassKey
+ * instance with the identical non-null referent as this one.
+ */
+ public boolean equals(Object obj) {
+ if (obj == this) {
+ return true;
+ }
+
+ if (obj instanceof WeakClassKey) {
+ Object referent = get();
+ return (referent != null) &&
+ (referent == ((WeakClassKey) obj).get());
+ } else {
+ return false;
+ }
+ }
+ }
+}