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    • org.glassfish.jersey.internal.inject.AnnotationLiteral Maven / Gradle / Ivy

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    A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle (jaxrs-ri.jar). Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from the command line.

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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
 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or 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 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
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 */

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:
      
 * 
    1. Must have the target annotation as its generic type
      2. 
 * 
    2. Must implement the target type
      3. 
 * 
    
 * 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) () -> {
            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) 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 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");
            }
        }
        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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