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Introducing AnnotationLiteral in injection spi.
Change-Id: If003e1fb134ebefadc5edc1a8cbcd82dc97f4dcd
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Petr Bouda
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Mar 1, 2017
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core-common/src/main/java/org/glassfish/jersey/spi/inject/AnnotationLiteral.java
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| /* | ||
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. | ||
| * | ||
| * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved. | ||
| * | ||
| * The contents of this file are subject to the terms of either the GNU | ||
| * General Public License Version 2 only ("GPL") or the Common Development | ||
| * and Distribution License("CDDL") (collectively, the "License"). You | ||
| * may not use this file except in compliance with the License. You can | ||
| * obtain a copy of the License at | ||
| * http://glassfish.java.net/public/CDDL+GPL_1_1.html | ||
| * or packager/legal/LICENSE.txt. See the License for the specific | ||
| * language governing permissions and limitations under the License. | ||
| * | ||
| * When distributing the software, include this License Header Notice in each | ||
| * file and include the License file at packager/legal/LICENSE.txt. | ||
| * | ||
| * GPL Classpath Exception: | ||
| * Oracle designates this particular file as subject to the "Classpath" | ||
| * exception as provided by Oracle in the GPL Version 2 section of the License | ||
| * file that accompanied this code. | ||
| * | ||
| * Modifications: | ||
| * If applicable, add the following below the License Header, with the fields | ||
| * enclosed by brackets [] replaced by your own identifying information: | ||
| * "Portions Copyright [year] [name of copyright owner]" | ||
| * | ||
| * Contributor(s): | ||
| * If you wish your version of this file to be governed by only the CDDL or | ||
| * only the GPL Version 2, indicate your decision by adding "[Contributor] | ||
| * elects to include this software in this distribution under the [CDDL or GPL | ||
| * Version 2] license." If you don't indicate a single choice of license, a | ||
| * recipient has the option to distribute your version of this file under | ||
| * either the CDDL, the GPL Version 2 or to extend the choice of license to | ||
| * its licensees as provided above. However, if you add GPL Version 2 code | ||
| * and therefore, elected the GPL Version 2 license, then the option applies | ||
| * only if the new code is made subject to such option by the copyright | ||
| * holder. | ||
| */ | ||
| package org.glassfish.jersey.spi.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. | ||
| * <p> | ||
| * An instance of an annotation type may be obtained by subclassing <tt>AnnotationLiteral</tt>. | ||
| * <pre> | ||
| * public abstract class PayByQualifier | ||
| * extends AnnotationLiteral<PayBy> | ||
| * implements PayBy {} | ||
| * </pre> | ||
| * An extension of AnnotationLiteral must do two things:<OL> | ||
| * <LI>Must have the target annotation as its generic type</LI> | ||
| * <LI>Must implement the target type</LI> | ||
| * </OL> | ||
| * In particular, in-line anonymous extensions of AnnotationLiteral will not | ||
| * work because in-line anonymous extensions of AnnotationLiteral cannot implement | ||
| * the target annotation | ||
| * | ||
| * @param <T> the annotation type | ||
| * @author jwells | ||
| */ | ||
| public abstract class AnnotationLiteral<T extends Annotation> implements Annotation, Serializable { | ||
|
|
||
| private static final long serialVersionUID = -3645430766814376616L; | ||
|
|
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| private transient Class<T> 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 <T> Class<T> getTypeParameter(Class<?> annotationLiteralSuperclass) { | ||
| Type type = annotationLiteralSuperclass.getGenericSuperclass(); | ||
| if (type instanceof ParameterizedType) { | ||
| ParameterizedType parameterizedType = (ParameterizedType) type; | ||
| if (parameterizedType.getActualTypeArguments().length == 1) { | ||
| return (Class<T>) parameterizedType.getActualTypeArguments()[0]; | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
|
|
||
| private static void setAccessible(final AccessibleObject ao) { | ||
| AccessController.doPrivileged((PrivilegedAction<Object>) () -> { | ||
| ao.setAccessible(true); | ||
| return null; | ||
| }); | ||
| } | ||
|
|
||
| private static Object invoke(Method method, Object instance) { | ||
| try { | ||
| if (!method.isAccessible()) { | ||
| setAccessible(method); | ||
| } | ||
| return method.invoke(instance); | ||
| } catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException e) { | ||
| throw new RuntimeException( | ||
| "Error checking value of member method " + method.getName() + " on " + method.getDeclaringClass(), e); | ||
| } | ||
| } | ||
|
|
||
| private Method[] getMembers() { | ||
| if (members == null) { | ||
| members = AccessController.doPrivileged((PrivilegedAction<Method[]>) annotationType()::getDeclaredMethods); | ||
|
|
||
| if (members.length > 0 && !annotationType().isAssignableFrom(this.getClass())) { | ||
| throw new RuntimeException( | ||
| getClass() + " does not implement the annotation type with members " + annotationType().getName()); | ||
| } | ||
| } | ||
| return members; | ||
| } | ||
|
|
||
| /** | ||
| * Method returns the type of the annotation literal. The value is resolved lazily during the first call of this method. | ||
| * | ||
| * @return annotation type of this literal. | ||
| */ | ||
| public Class<? extends Annotation> annotationType() { | ||
| if (annotationType == null) { | ||
| Class<?> annotationLiteralSubclass = getAnnotationLiteralSubclass(this.getClass()); | ||
| if (annotationLiteralSubclass == null) { | ||
| throw new RuntimeException(getClass() + "is not a subclass of AnnotationLiteral"); | ||
| } | ||
| annotationType = getTypeParameter(annotationLiteralSubclass); | ||
| if (annotationType == null) { | ||
| throw new RuntimeException(getClass() + " does not specify the type parameter T of AnnotationLiteral<T>"); | ||
| } | ||
| } | ||
| return annotationType; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean equals(Object other) { | ||
| if (other instanceof Annotation) { | ||
| Annotation that = (Annotation) other; | ||
| if (this.annotationType().equals(that.annotationType())) { | ||
| for (Method member : getMembers()) { | ||
| Object thisValue = invoke(member, this); | ||
| Object thatValue = invoke(member, that); | ||
| if (thisValue instanceof byte[] && thatValue instanceof byte[]) { | ||
| if (!Arrays.equals((byte[]) thisValue, (byte[]) thatValue)) { | ||
| return false; | ||
| } | ||
| } else if (thisValue instanceof short[] && thatValue instanceof short[]) { | ||
| if (!Arrays.equals((short[]) thisValue, (short[]) thatValue)) { | ||
| return false; | ||
| } | ||
| } else if (thisValue instanceof int[] && thatValue instanceof int[]) { | ||
| if (!Arrays.equals((int[]) thisValue, (int[]) thatValue)) { | ||
| return false; | ||
| } | ||
| } else if (thisValue instanceof long[] && thatValue instanceof long[]) { | ||
| if (!Arrays.equals((long[]) thisValue, (long[]) thatValue)) { | ||
| return false; | ||
| } | ||
| } else if (thisValue instanceof float[] && thatValue instanceof float[]) { | ||
| if (!Arrays.equals((float[]) thisValue, (float[]) thatValue)) { | ||
| return false; | ||
| } | ||
| } else if (thisValue instanceof double[] && thatValue instanceof double[]) { | ||
| if (!Arrays.equals((double[]) thisValue, (double[]) thatValue)) { | ||
| return false; | ||
| } | ||
| } else if (thisValue instanceof char[] && thatValue instanceof char[]) { | ||
| if (!Arrays.equals((char[]) thisValue, (char[]) thatValue)) { | ||
| return false; | ||
| } | ||
| } else if (thisValue instanceof boolean[] && thatValue instanceof boolean[]) { | ||
| if (!Arrays.equals((boolean[]) thisValue, (boolean[]) thatValue)) { | ||
| return false; | ||
| } | ||
| } else if (thisValue instanceof Object[] && thatValue instanceof Object[]) { | ||
| if (!Arrays.equals((Object[]) thisValue, (Object[]) thatValue)) { | ||
| return false; | ||
| } | ||
| } else { | ||
| if (!thisValue.equals(thatValue)) { | ||
| return false; | ||
| } | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| @Override | ||
| public int hashCode() { | ||
|
|
||
| int hashCode = 0; | ||
| for (Method member : getMembers()) { | ||
| int memberNameHashCode = 127 * member.getName().hashCode(); | ||
| Object value = invoke(member, this); | ||
| int memberValueHashCode; | ||
| if (value instanceof boolean[]) { | ||
| memberValueHashCode = Arrays.hashCode((boolean[]) value); | ||
| } else if (value instanceof short[]) { | ||
| memberValueHashCode = Arrays.hashCode((short[]) value); | ||
| } else if (value instanceof int[]) { | ||
| memberValueHashCode = Arrays.hashCode((int[]) value); | ||
| } else if (value instanceof long[]) { | ||
| memberValueHashCode = Arrays.hashCode((long[]) value); | ||
| } else if (value instanceof float[]) { | ||
| memberValueHashCode = Arrays.hashCode((float[]) value); | ||
| } else if (value instanceof double[]) { | ||
| memberValueHashCode = Arrays.hashCode((double[]) value); | ||
| } else if (value instanceof byte[]) { | ||
| memberValueHashCode = Arrays.hashCode((byte[]) value); | ||
| } else if (value instanceof char[]) { | ||
| memberValueHashCode = Arrays.hashCode((char[]) value); | ||
| } else if (value instanceof Object[]) { | ||
| memberValueHashCode = Arrays.hashCode((Object[]) value); | ||
| } else { | ||
| memberValueHashCode = value.hashCode(); | ||
| } | ||
| hashCode += memberNameHashCode ^ memberValueHashCode; | ||
| } | ||
| return hashCode; | ||
| } | ||
|
|
||
| } |
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