org.glassfish.jersey.internal.inject.AnnotationLiteral Maven / Gradle / Ivy
/*
* Copyright (c) 2017, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.jersey.internal.inject;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Arrays;
/**
* Supports inline instantiation of annotation type instances.
*
* An instance of an annotation type may be obtained by subclassing AnnotationLiteral.
*
* public abstract class PayByQualifier
* extends AnnotationLiteral<PayBy>
* implements PayBy {}
*
* An extension of AnnotationLiteral must do two things:
* - Must have the target annotation as its generic type
* - Must implement the target type
*
* In particular, in-line anonymous extensions of AnnotationLiteral will not
* work because in-line anonymous extensions of AnnotationLiteral cannot implement
* the target annotation
*
* @param the annotation type
* @author jwells
*/
public abstract class AnnotationLiteral implements Annotation, Serializable {
private static final long serialVersionUID = -3645430766814376616L;
private transient Class annotationType;
private transient Method[] members;
protected AnnotationLiteral() {
Class thisClass = this.getClass();
boolean foundAnnotation = false;
for (Class iClass : thisClass.getInterfaces()) {
if (iClass.isAnnotation()) {
foundAnnotation = true;
break;
}
}
if (!foundAnnotation) {
throw new IllegalStateException(
"The subclass " + thisClass.getName() + " of AnnotationLiteral must implement an Annotation");
}
}
private static Class getAnnotationLiteralSubclass(Class clazz) {
Class superclass = clazz.getSuperclass();
if (superclass.equals(AnnotationLiteral.class)) {
return clazz;
} else if (superclass.equals(Object.class)) {
return null;
} else {
return getAnnotationLiteralSubclass(superclass);
}
}
@SuppressWarnings("unchecked")
private static Class getTypeParameter(Class annotationLiteralSuperclass) {
Type type = annotationLiteralSuperclass.getGenericSuperclass();
if (type instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) type;
if (parameterizedType.getActualTypeArguments().length == 1) {
return (Class) parameterizedType.getActualTypeArguments()[0];
}
}
return null;
}
private static void setAccessible(final AccessibleObject ao) {
AccessController.doPrivileged((PrivilegedAction