/*
 * Copyright 2005 the original author or authors.
 * 
 * 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.wamblee.photos.concurrent;

import org.wamblee.concurrency.ReadWriteLock;
import org.wamblee.photos.model.PhotoEntry;

/**
 * Decorator base class for a photo entry. 
 */
public class ConcurrentPhotoEntry implements PhotoEntry {

    private PhotoEntry _entry;

    private ReadWriteLock _lock;

    protected ConcurrentPhotoEntry(PhotoEntry aEntry) {
        _entry = aEntry;
        _lock = new ReadWriteLock();
    }
    
    protected PhotoEntry getEntry() {
        return _entry; 
    }
    
    protected ReadWriteLock lock() {
        return _lock; 
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.wamblee.photos.model.PhotoEntry#getId()
     */
    public String getId() {
        _lock.acquireRead();
        try {
            return _entry.getId();
        } finally {
            _lock.releaseRead();
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.wamblee.photos.model.PhotoEntry#getPath()
     */
    public String getPath() {
        _lock.acquireRead(); 
        try {
            return _entry.getPath(); 
        } finally {
            _lock.releaseRead(); 
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Comparable#compareTo(java.lang.Object)
     */
    public int compareTo(PhotoEntry aEntry) {
        _lock.acquireRead();
        try {
            return _entry.compareTo(aEntry); // TODO: is this safe? 
        }
        finally {
            _lock.releaseRead(); 
        }
    }

}