com.sun.tools.javac.code.AnnoConstruct Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jdk.compiler Show documentation
Show all versions of jdk.compiler Show documentation
Maven repackaging of OpenJDK's jdk.compiler module
The newest version!
/*
* 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.annotation.Inherited;
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.
*
* 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.
*/
public abstract class AnnoConstruct implements AnnotatedConstruct {
// Override to enforce a narrower return type.
@Override
public abstract List getAnnotationMirrors();
// This method is part of the javax.lang.model API, do not use this in javac code.
protected Attribute.Compound getAttribute(Class 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[] getInheritedAnnotations(Class 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[] getAnnotationsByType(Class 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 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 &&
annoType.isAnnotationPresent(Inherited.class))
return getInheritedAnnotations(annoType);
Attribute.Compound[] contained = unpackContained(container);
// In case of an empty legacy container we might need to look for
// inherited annos as well
if (direct == null && contained.length == 0 &&
annoType.isAnnotationPresent(Inherited.class))
return getInheritedAnnotations(annoType);
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;
}
private Attribute.Compound[] unpackContained(Attribute.Compound container) {
// Pack them in an array
Attribute[] contained0 = null;
if (container != null)
contained0 = unpackAttributes(container);
ListBuffer compounds = new ListBuffer<>();
if (contained0 != null) {
for (Attribute a : contained0)
if (a instanceof Attribute.Compound)
compounds = compounds.append((Attribute.Compound)a);
}
return compounds.toArray(new Attribute.Compound[compounds.size()]);
}
// This method is part of the javax.lang.model API, do not use this in javac code.
public A getAnnotation(Class 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 REPEATABLE_CLASS = initRepeatable();
private static final Method VALUE_ELEMENT_METHOD = initValueElementMethod();
private static Class 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 getContainer(Class 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 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;
}
}