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/*
 * Copyright (c) 2008, 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 com.sun.enterprise.util;

import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

import org.glassfish.api.admin.ManagedJob;

/**
 * Place for handy annotation utils.
 *
 * @author mmares
 */
public class AnnotationUtil {

    /**
     * If annotation is present on given type or on annotation which is on given type.
     */
    public static boolean presentTransitive(Class annotationClass, Class type) {
        if (type == null) {
            return false;
        }

        if (type.isAnnotationPresent(annotationClass)) {
            return true;
        }

        // Search for annotated annotations
        for (Annotation anno : type.getAnnotations()) {
            if (anno.annotationType().isAnnotationPresent(ManagedJob.class)) {
                return true;
            }
        }

        return false;
    }

    @SafeVarargs
    public static Annotation[] createAnnotationInstances(Class... types) {
        Annotation[] instances = (Annotation[]) Array.newInstance(Annotation.class, types.length);

        for (int i = 0; i < types.length; i++) {
            instances[i] = createAnnotationInstance(types[i]);
        }

        return instances;
    }

    public static Annotation createAnnotationInstance(Class type) {
        return (Annotation) Proxy.newProxyInstance(type.getClassLoader(), new Class[] { type }, new AnnotationInvocationHandler(type));
    }

    static class AnnotationInvocationHandler implements InvocationHandler, Serializable {

        private static final long serialVersionUID = 1L;

        private final Class type;

        AnnotationInvocationHandler(Class type) {
            this.type = type;
        }

        @Override
        public boolean equals(Object other) {
            return type.isInstance(other);
        }

        @Override
        public int hashCode() {
            return type.hashCode();
        }

        @Override
        public String toString() {
            return "@" + type.getName();
        }

        @Override
        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
            switch (method.getName()) {
                case "annotationType":
                    return type;
                case "equals":
                    return args.length > 0 && equals(args[0]);
                case "hashCode":
                    return hashCode();
                case "toString":
                    return toString();
                default:
                    return null;
                }
        }

    }

}