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/*
* Copyright (c) 2003, 2016, 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
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*/
package sun.reflect.annotation;
import java.lang.annotation.*;
import java.lang.reflect.*;
import java.util.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
import jdk.internal.misc.SharedSecrets;
import jdk.internal.misc.JavaLangAccess;
/**
* Represents an annotation type at run time. Used to type-check annotations
* and apply member defaults.
*
* @author Josh Bloch
* @since 1.5
*/
public class AnnotationType {
/**
* Member name -> type mapping. Note that primitive types
* are represented by the class objects for the corresponding wrapper
* types. This matches the return value that must be used for a
* dynamic proxy, allowing for a simple isInstance test.
*/
private final Map> memberTypes;
/**
* Member name -> default value mapping.
*/
private final Map memberDefaults;
/**
* Member name -> Method object mapping. This (and its associated
* accessor) are used only to generate AnnotationTypeMismatchExceptions.
*/
private final Map members;
/**
* The retention policy for this annotation type.
*/
private final RetentionPolicy retention;
/**
* Whether this annotation type is inherited.
*/
private final boolean inherited;
/**
* Returns an AnnotationType instance for the specified annotation type.
*
* @throws IllegalArgumentException if the specified class object
* does not represent a valid annotation type
*/
public static AnnotationType getInstance(
Class annotationClass)
{
JavaLangAccess jla = SharedSecrets.getJavaLangAccess();
AnnotationType result = jla.getAnnotationType(annotationClass); // volatile read
if (result == null) {
result = new AnnotationType(annotationClass);
// try to CAS the AnnotationType: null -> result
if (!jla.casAnnotationType(annotationClass, null, result)) {
// somebody was quicker -> read it's result
result = jla.getAnnotationType(annotationClass);
assert result != null;
}
}
return result;
}
/**
* Sole constructor.
*
* @param annotationClass the class object for the annotation type
* @throws IllegalArgumentException if the specified class object for
* does not represent a valid annotation type
*/
private AnnotationType(final Class annotationClass) {
if (!annotationClass.isAnnotation())
throw new IllegalArgumentException("Not an annotation type");
Method[] methods =
AccessController.doPrivileged(new PrivilegedAction<>() {
public Method[] run() {
// Initialize memberTypes and defaultValues
return annotationClass.getDeclaredMethods();
}
});
memberTypes = new HashMap<>(methods.length+1, 1.0f);
memberDefaults = new HashMap<>(0);
members = new HashMap<>(methods.length+1, 1.0f);
for (Method method : methods) {
if (Modifier.isPublic(method.getModifiers()) &&
Modifier.isAbstract(method.getModifiers()) &&
!method.isSynthetic()) {
if (method.getParameterTypes().length != 0) {
throw new IllegalArgumentException(method + " has params");
}
String name = method.getName();
Class type = method.getReturnType();
memberTypes.put(name, invocationHandlerReturnType(type));
members.put(name, method);
Object defaultValue = method.getDefaultValue();
if (defaultValue != null) {
memberDefaults.put(name, defaultValue);
}
}
}
// Initialize retention, & inherited fields. Special treatment
// of the corresponding annotation types breaks infinite recursion.
if (annotationClass != Retention.class &&
annotationClass != Inherited.class) {
JavaLangAccess jla = SharedSecrets.getJavaLangAccess();
Map, Annotation> metaAnnotations =
AnnotationParser.parseSelectAnnotations(
jla.getRawClassAnnotations(annotationClass),
jla.getConstantPool(annotationClass),
annotationClass,
Retention.class, Inherited.class
);
Retention ret = (Retention) metaAnnotations.get(Retention.class);
retention = (ret == null ? RetentionPolicy.CLASS : ret.value());
inherited = metaAnnotations.containsKey(Inherited.class);
}
else {
retention = RetentionPolicy.RUNTIME;
inherited = false;
}
}
/**
* Returns the type that must be returned by the invocation handler
* of a dynamic proxy in order to have the dynamic proxy return
* the specified type (which is assumed to be a legal member type
* for an annotation).
*/
public static Class invocationHandlerReturnType(Class type) {
// Translate primitives to wrappers
if (type == byte.class)
return Byte.class;
if (type == char.class)
return Character.class;
if (type == double.class)
return Double.class;
if (type == float.class)
return Float.class;
if (type == int.class)
return Integer.class;
if (type == long.class)
return Long.class;
if (type == short.class)
return Short.class;
if (type == boolean.class)
return Boolean.class;
// Otherwise, just return declared type
return type;
}
/**
* Returns member types for this annotation type
* (member name {@literal ->} type mapping).
*/
public Map> memberTypes() {
return memberTypes;
}
/**
* Returns members of this annotation type
* (member name {@literal ->} associated Method object mapping).
*/
public Map members() {
return members;
}
/**
* Returns the default values for this annotation type
* (Member name {@literal ->} default value mapping).
*/
public Map memberDefaults() {
return memberDefaults;
}
/**
* Returns the retention policy for this annotation type.
*/
public RetentionPolicy retention() {
return retention;
}
/**
* Returns true if this annotation type is inherited.
*/
public boolean isInherited() {
return inherited;
}
/**
* For debugging.
*/
public String toString() {
return "Annotation Type:\n" +
" Member types: " + memberTypes + "\n" +
" Member defaults: " + memberDefaults + "\n" +
" Retention policy: " + retention + "\n" +
" Inherited: " + inherited;
}
}