/*
 * 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.model.filesystem;

import java.io.File;
import java.io.IOException;
import java.util.List;

import org.wamblee.cache.Cache;
import org.wamblee.photos.model.PhotoEntry;

/**
 * Callback interface used to find a photo entry by id. 
 */
class FindByIdCallback implements EntryFoundCallback {
    /**
     * Id of the entry to look for. 
     */
	private String _id;
    
    /**
     * Search result or null if not found yet.  
     */
	private PhotoEntry _entry;
    
    /**
     * Cache to use. 
     */
    private Cache _cache; 
	
    /**
     * Constructs the callback. 
     * @param aId Photo entry id to look for. 
     */
	public FindByIdCallback(String aId, Cache aCache) {
		_id = aId;    
		_entry = null; 
        _cache = aCache; 
	}
    
    /**
     * Gets the entry that was found. 
     * @return Photo entry or null if not found. 
     */
	public PhotoEntry getEntry() {
		return _entry;    
	}
    
    /*
     *  (non-Javadoc)
     * @see org.wamblee.photos.model.file.EntryFoundCallback#photoFound(java.io.File, java.io.File, java.lang.String)
     */
	public boolean photoFound(List<PhotoEntry> aEntries, File aThumbnail, File aPhoto, String aPath) {
		if ( FileSystemPhoto.getId(aPath).equals(_id)) {
			_entry = new FileSystemPhoto(aThumbnail, aPhoto, aPath);
			return false; 
		}
		return true; // continue search.
	}
	
    /*
     *  (non-Javadoc)
     * @see org.wamblee.photos.model.file.EntryFoundCallback#albumFound(java.io.File, java.lang.String)
     */
	public boolean albumFound(List<PhotoEntry> aEntries, File aAlbum, String aPath) throws IOException {
		FileSystemAlbum albumEntry = new FileSystemAlbum(aAlbum, aPath, _cache); 
		if ( aAlbum.getName().equals(_id)) {
			_entry = albumEntry; 
			return false; 
		}
		return albumEntry.traverse(albumEntry.getPath(), aEntries, aAlbum, this); // continue search.
	}
}