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/*
 * RED5 Open Source Media Server - https://github.com/Red5/
 * 
 * Copyright 2006-2016 by respective authors (see below). All rights reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.red5.server.api.persistence;

import java.lang.reflect.Constructor;

import org.springframework.core.io.support.ResourcePatternResolver;

/**
 * Helper class for persistence.
 * 
 * @author The Red5 Project
 * @author Joachim Bauch ([email protected])
 */
public class PersistenceUtils {

    /**
     * Returns persistence store object class constructor
     * 
     * @param theClass
     *            Persistence store class
     * @param interfaces
     *            Interfaces that are being implemented by persistence store object class
     * @return Constructor
     * @throws Exception
     */
    private static Constructor getPersistenceStoreConstructor(Class theClass, Class[] interfaces) throws Exception {
        Constructor constructor = null;
        for (Class interfaceClass : interfaces) {
            try {
                constructor = theClass.getConstructor(new Class[] { interfaceClass });
            } catch (NoSuchMethodException err) {
                // Ignore this error
            }
            if (constructor != null) {
                break;
            }
            constructor = getPersistenceStoreConstructor(theClass, interfaceClass.getInterfaces());
            if (constructor != null) {
                break;
            }
        }
        return constructor;
    }

    /**
     * Returns persistence store object. Persistence store is a special object that stores persistence objects and provides methods to manipulate them (save, load, remove, list).
     * 
     * @param resolver
     *            Resolves connection pattern into Resource object
     * @param className
     *            Name of persistence class
     * @return IPersistence store object that provides methods for persistence object handling
     * @throws Exception
     *             if error
     */
    public static IPersistenceStore getPersistenceStore(ResourcePatternResolver resolver, String className) throws Exception {
        Class persistenceClass = Class.forName(className);
        Constructor constructor = getPersistenceStoreConstructor(persistenceClass, resolver.getClass().getInterfaces());
        if (constructor == null) {
            // Search in superclasses of the object.
            Class superClass = resolver.getClass().getSuperclass();
            while (superClass != null) {
                constructor = getPersistenceStoreConstructor(persistenceClass, superClass.getInterfaces());
                if (constructor != null) {
                    break;
                }
                superClass = superClass.getSuperclass();
            }
        }
        if (constructor == null) {
            throw new NoSuchMethodException();
        }
        return (IPersistenceStore) constructor.newInstance(new Object[] { resolver });
    }

}