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/*
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* Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.awt.datatransfer;
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import java.awt.datatransfer.DataFlavor;
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import java.awt.datatransfer.Transferable;
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import java.awt.datatransfer.UnsupportedFlavorException;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.InputStream;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.ObjectStreamClass;
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import java.io.OutputStream;
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import java.lang.reflect.Modifier;
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import java.lang.reflect.Proxy;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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/**
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* Proxies for another Transferable so that Serializable objects are never
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* returned directly by DnD or the Clipboard. Instead, a new instance of the
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* object is returned.
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*
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* @author Lawrence P.G. Cable
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* @author David Mendenhall
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*
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* @since 1.4
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*/
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public class TransferableProxy implements Transferable {
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public TransferableProxy(Transferable t, boolean local) {
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transferable = t;
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isLocal = local;
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}
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public DataFlavor[] getTransferDataFlavors() {
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return transferable.getTransferDataFlavors();
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}
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public boolean isDataFlavorSupported(DataFlavor flavor) {
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return transferable.isDataFlavorSupported(flavor);
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}
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public Object getTransferData(DataFlavor df)
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throws UnsupportedFlavorException, IOException
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{
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Object data = transferable.getTransferData(df);
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// If the data is a Serializable object, then create a new instance
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// before returning it. This insulates applications sharing DnD and
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// Clipboard data from each other.
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if (data != null && isLocal && df.isFlavorSerializedObjectType()) {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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ClassLoaderObjectOutputStream oos =
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new ClassLoaderObjectOutputStream(baos);
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oos.writeObject(data);
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ByteArrayInputStream bais =
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new ByteArrayInputStream(baos.toByteArray());
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try {
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ClassLoaderObjectInputStream ois =
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new ClassLoaderObjectInputStream(bais,
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oos.getClassLoaderMap());
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data = ois.readObject();
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} catch (ClassNotFoundException cnfe) {
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throw (IOException)new IOException().initCause(cnfe);
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}
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}
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return data;
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}
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protected final Transferable transferable;
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protected final boolean isLocal;
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}
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class ClassLoaderObjectOutputStream extends ObjectOutputStream {
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private final Map<Set<String>, ClassLoader> map =
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new HashMap<Set<String>, ClassLoader>();
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public ClassLoaderObjectOutputStream(OutputStream os) throws IOException {
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super(os);
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}
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protected void annotateClass(final Class<?> cl) throws IOException {
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ClassLoader classLoader =
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(ClassLoader)AccessController.doPrivileged(new PrivilegedAction() {
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public Object run() {
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return cl.getClassLoader();
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}
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});
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Set<String> s = new HashSet<String>(1);
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s.add(cl.getName());
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map.put(s, classLoader);
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}
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protected void annotateProxyClass(final Class<?> cl) throws IOException {
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ClassLoader classLoader =
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(ClassLoader)AccessController.doPrivileged(new PrivilegedAction() {
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public Object run() {
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return cl.getClassLoader();
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}
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});
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Class[] interfaces = cl.getInterfaces();
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Set<String> s = new HashSet<String>(interfaces.length);
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for (int i = 0; i < interfaces.length; i++) {
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s.add(interfaces[i].getName());
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}
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map.put(s, classLoader);
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}
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public Map<Set<String>, ClassLoader> getClassLoaderMap() {
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return new HashMap(map);
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}
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}
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class ClassLoaderObjectInputStream extends ObjectInputStream {
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private final Map<Set<String>, ClassLoader> map;
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public ClassLoaderObjectInputStream(InputStream is,
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Map<Set<String>, ClassLoader> map)
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throws IOException {
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super(is);
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if (map == null) {
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throw new NullPointerException("Null map");
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}
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this.map = map;
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}
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protected Class<?> resolveClass(ObjectStreamClass classDesc)
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throws IOException, ClassNotFoundException {
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String className = classDesc.getName();
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Set<String> s = new HashSet<String>(1);
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s.add(className);
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ClassLoader classLoader = map.get(s);
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return Class.forName(className, false, classLoader);
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}
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protected Class<?> resolveProxyClass(String[] interfaces)
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throws IOException, ClassNotFoundException {
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Set<String> s = new HashSet<String>(interfaces.length);
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for (int i = 0; i < interfaces.length; i++) {
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s.add(interfaces[i]);
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}
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ClassLoader classLoader = map.get(s);
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// The code below is mostly copied from the superclass.
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ClassLoader nonPublicLoader = null;
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boolean hasNonPublicInterface = false;
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// define proxy in class loader of non-public interface(s), if any
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Class[] classObjs = new Class[interfaces.length];
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for (int i = 0; i < interfaces.length; i++) {
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Class cl = Class.forName(interfaces[i], false, classLoader);
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if ((cl.getModifiers() & Modifier.PUBLIC) == 0) {
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if (hasNonPublicInterface) {
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if (nonPublicLoader != cl.getClassLoader()) {
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throw new IllegalAccessError(
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"conflicting non-public interface class loaders");
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}
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} else {
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nonPublicLoader = cl.getClassLoader();
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hasNonPublicInterface = true;
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}
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}
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classObjs[i] = cl;
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}
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try {
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return Proxy.getProxyClass(hasNonPublicInterface ?
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nonPublicLoader : classLoader,
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classObjs);
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} catch (IllegalArgumentException e) {
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throw new ClassNotFoundException(null, e);
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}
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}
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}
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