--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/share/classes/com/sun/tools/javac/code/AnnoConstruct.java Thu Oct 10 08:51:55 2013 +0200
@@ -0,0 +1,238 @@
+/*
+ * Copyright (c) 2005, 2013, 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 com.sun.tools.javac.code;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+import javax.lang.model.AnnotatedConstruct;
+
+import com.sun.tools.javac.model.AnnotationProxyMaker;
+import com.sun.tools.javac.util.List;
+import com.sun.tools.javac.util.ListBuffer;
+
+/**
+ * Common super type for annotated constructs such as Types and Symbols.
+ *
+ * This class should *not* contain any fields since it would have a significant
+ * impact on the javac memory footprint.
+ *
+ * <p><b>This is NOT part of any supported API.
+ * If you write code that depends on this, you do so at your own
+ * risk. This code and its internal interfaces are subject to change
+ * or deletion without notice.</b></p>
+ */
+public abstract class AnnoConstruct implements AnnotatedConstruct {
+
+
+ // Override to enforce a narrower return type.
+ @Override
+ public abstract List<? extends Attribute.Compound> getAnnotationMirrors();
+
+
+ // This method is part of the javax.lang.model API, do not use this in javac code.
+ protected <A extends Annotation> Attribute.Compound getAttribute(Class<A> annoType) {
+ String name = annoType.getName();
+
+ for (Attribute.Compound anno : getAnnotationMirrors()) {
+ if (name.equals(anno.type.tsym.flatName().toString()))
+ return anno;
+ }
+
+ return null;
+ }
+
+
+ @SuppressWarnings("unchecked")
+ protected <A extends Annotation> A[] getInheritedAnnotations(Class<A> annoType) {
+ return (A[]) java.lang.reflect.Array.newInstance(annoType, 0); // annoType is the Class for A
+ }
+
+
+ // This method is part of the javax.lang.model API, do not use this in javac code.
+ public <A extends Annotation> A[] getAnnotationsByType(Class<A> annoType) {
+
+ if (!annoType.isAnnotation())
+ throw new IllegalArgumentException("Not an annotation type: "
+ + annoType);
+ // If annoType does not declare a container this is equivalent to wrapping
+ // getAnnotation(...) in an array.
+ Class <? extends Annotation> containerType = getContainer(annoType);
+ if (containerType == null) {
+ A res = getAnnotation(annoType);
+ int size = res == null ? 0 : 1;
+
+ @SuppressWarnings("unchecked") // annoType is the Class for A
+ A[] arr = (A[])java.lang.reflect.Array.newInstance(annoType, size);
+ if (res != null)
+ arr[0] = res;
+ return arr;
+ }
+
+ // So we have a containing type
+ String annoTypeName = annoType.getName();
+ String containerTypeName = containerType.getName();
+ int directIndex = -1, containerIndex = -1;
+ Attribute.Compound direct = null, container = null;
+ // Find directly (explicit or implicit) present annotations
+ int index = -1;
+ for (Attribute.Compound attribute : getAnnotationMirrors()) {
+ index++;
+ if (attribute.type.tsym.flatName().contentEquals(annoTypeName)) {
+ directIndex = index;
+ direct = attribute;
+ } else if(containerTypeName != null &&
+ attribute.type.tsym.flatName().contentEquals(containerTypeName)) {
+ containerIndex = index;
+ container = attribute;
+ }
+ }
+
+ // Deal with inherited annotations
+ if (direct == null && container == null)
+ return getInheritedAnnotations(annoType);
+
+ // Pack them in an array
+ Attribute[] contained0 = null;
+ if (container != null)
+ contained0 = unpackAttributes(container);
+ ListBuffer<Attribute.Compound> compounds = new ListBuffer<>();
+ if (contained0 != null) {
+ for (Attribute a : contained0)
+ if (a instanceof Attribute.Compound)
+ compounds = compounds.append((Attribute.Compound)a);
+ }
+ Attribute.Compound[] contained = compounds.toArray(new Attribute.Compound[compounds.size()]);
+
+ int size = (direct == null ? 0 : 1) + contained.length;
+ @SuppressWarnings("unchecked") // annoType is the Class for A
+ A[] arr = (A[])java.lang.reflect.Array.newInstance(annoType, size);
+
+ // if direct && container, which is first?
+ int insert = -1;
+ int length = arr.length;
+ if (directIndex >= 0 && containerIndex >= 0) {
+ if (directIndex < containerIndex) {
+ arr[0] = AnnotationProxyMaker.generateAnnotation(direct, annoType);
+ insert = 1;
+ } else {
+ arr[arr.length - 1] = AnnotationProxyMaker.generateAnnotation(direct, annoType);
+ insert = 0;
+ length--;
+ }
+ } else if (directIndex >= 0) {
+ arr[0] = AnnotationProxyMaker.generateAnnotation(direct, annoType);
+ return arr;
+ } else {
+ // Only container
+ insert = 0;
+ }
+
+ for (int i = 0; i + insert < length; i++)
+ arr[insert + i] = AnnotationProxyMaker.generateAnnotation(contained[i], annoType);
+
+ return arr;
+ }
+
+
+ // This method is part of the javax.lang.model API, do not use this in javac code.
+ public <A extends Annotation> A getAnnotation(Class<A> annoType) {
+
+ if (!annoType.isAnnotation())
+ throw new IllegalArgumentException("Not an annotation type: " + annoType);
+
+ Attribute.Compound c = getAttribute(annoType);
+ return c == null ? null : AnnotationProxyMaker.generateAnnotation(c, annoType);
+ }
+
+ // Needed to unpack the runtime view of containing annotations
+ private static final Class<? extends Annotation> REPEATABLE_CLASS = initRepeatable();
+ private static final Method VALUE_ELEMENT_METHOD = initValueElementMethod();
+
+ private static Class<? extends Annotation> initRepeatable() {
+ try {
+ // Repeatable will not be available when bootstrapping on
+ // JDK 7 so use a reflective lookup instead of a class
+ // literal for Repeatable.class.
+ return Class.forName("java.lang.annotation.Repeatable").asSubclass(Annotation.class);
+ } catch (ClassNotFoundException | SecurityException e) {
+ return null;
+ }
+ }
+
+ private static Method initValueElementMethod() {
+ if (REPEATABLE_CLASS == null)
+ return null;
+
+ Method m = null;
+ try {
+ m = REPEATABLE_CLASS.getMethod("value");
+ if (m != null)
+ m.setAccessible(true);
+ return m;
+ } catch (NoSuchMethodException e) {
+ return null;
+ }
+ }
+
+
+ // Helper to getAnnotationsByType
+ private static Class<? extends Annotation> getContainer(Class<? extends Annotation> annoType) {
+ // Since we can not refer to java.lang.annotation.Repeatable until we are
+ // bootstrapping with java 8 we need to get the Repeatable annotation using
+ // reflective invocations instead of just using its type and element method.
+ if (REPEATABLE_CLASS != null &&
+ VALUE_ELEMENT_METHOD != null) {
+ // Get the Repeatable instance on the annotations declaration
+ Annotation repeatable = (Annotation)annoType.getAnnotation(REPEATABLE_CLASS);
+ if (repeatable != null) {
+ try {
+ // Get the value element, it should be a class
+ // indicating the containing annotation type
+ @SuppressWarnings("unchecked")
+ Class<? extends Annotation> containerType = (Class)VALUE_ELEMENT_METHOD.invoke(repeatable);
+ if (containerType == null)
+ return null;
+
+ return containerType;
+ } catch (ClassCastException | IllegalAccessException | InvocationTargetException e) {
+ return null;
+ }
+ }
+ }
+ return null;
+ }
+
+
+ // Helper to getAnnotationsByType
+ private static Attribute[] unpackAttributes(Attribute.Compound container) {
+ // We now have an instance of the container,
+ // unpack it returning an instance of the
+ // contained type or null
+ return ((Attribute.Array)container.member(container.type.tsym.name.table.names.value)).values;
+ }
+
+}