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/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2011-2016, TeleStax Inc. and individual contributors
 * by the @authors tag.
 *
 * This program is free software: you can redistribute it and/or modify
 * under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see 
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *   JBoss, Home of Professional Open Source
 *   Copyright 2007-2011, Red Hat, Inc. and individual contributors
 *   by the @authors tag. See the copyright.txt in the distribution for a
 *   full listing of individual contributors.
 *
 *   This is free software; you can redistribute it and/or modify it
 *   under the terms of the GNU Lesser General Public License as
 *   published by the Free Software Foundation; either version 2.1 of
 *   the License, or (at your option) any later version.
 *
 *   This software 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
 *   Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this software; if not, write to the Free
 *   Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 *   02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jdiameter.client.impl.annotation.internal;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author [email protected]
 * @author  Alexandre Mendonca 
 * @author  Bartosz Baranowski 
 */
@SuppressWarnings("all")
public class MethodInfo {

    private Storage storage;
    private Method method;
    private ClassInfo classInfo;
    private Collection annotationsCache;
    private Map, Annotation> annotationStorage;

    public MethodInfo(Storage storage, ClassInfo classInfo, Method method) {
        this.storage = storage;
        this.classInfo = classInfo;
        this.method = method;
    }

    public Method getMethod() {
        return method;
    }

    public ClassInfo getClassInfo() {
        return classInfo;
    }

    public Collection getAnnotations() {
        return annotationsCache == null ? (annotationsCache = getAnnotationStorage().values()) : annotationsCache;
    }

    public  T getAnnotation(Class annotation) {
        for (Annotation a : getAnnotations()) {
            if (a.annotationType() == annotation) {
                return (T) a;
            }
        }
        return null;
    }

    private Map, Annotation> getAnnotationStorage() {
        if (annotationStorage == null) {
            annotationStorage = new ConcurrentHashMap, Annotation>();
            Class parent = getClassInfo().getAttachedClass().getSuperclass();
            if (parent != null) {
                addAnnotations(
                        storage.getClassInfo(parent).getMethodInfo(getMethod().getName(), getMethod().getParameterTypes()));
            }
            for (Class i : getClassInfo().getAttachedClass().getInterfaces()) {
                addAnnotations(storage.getClassInfo(i).getMethodInfo(getMethod().getName(), getMethod().getParameterTypes()));
            }
            for (Annotation a : getMethod().getDeclaredAnnotations()) {
                annotationStorage.put(a.getClass().getInterfaces()[0], a);
            }
        }
        return annotationStorage;
    }

    private void addAnnotations(MethodInfo method) {
        if (method != null) {
            for (Annotation annotation : method.getAnnotations()) {
                if (annotation != null) {
                    for (Class _interface : annotation.getClass().getInterfaces()) {
                        annotationStorage.put(_interface, annotation); // [0]
                    }
                }
            }
        }
    }
}