org.dyndns.jkiddo.dmp.chunks.media.Listing.java Source code

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Here is the source code for org.dyndns.jkiddo.dmp.chunks.media.Listing.java

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/*******************************************************************************
 * Copyright (c) 2013 Jens Kristian Villadsen.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Jens Kristian Villadsen - Lead developer, owner and creator
 ******************************************************************************/
/*
 * Digital Audio Access Protocol (DAAP) Library
 * Copyright (C) 2004-2010 Roger Kapsi
 *
 * 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.dyndns.jkiddo.dmp.chunks.media;

import java.util.NoSuchElementException;

import org.dyndns.jkiddo.dmp.chunks.Chunk;
import org.dyndns.jkiddo.dmp.chunks.ContainerChunk;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;

/**
 * Used to group ListingItems objects.
 * 
 * @see ListingItem
 * @author Roger Kapsi
 */
import org.dyndns.jkiddo.dmp.IDmapProtocolDefinition.DmapChunkDefinition;
import org.dyndns.jkiddo.dmp.DMAPAnnotation;

@DMAPAnnotation(type = DmapChunkDefinition.mlcl)
public class Listing extends ContainerChunk {
    public final static Logger logger = LoggerFactory.getLogger(Listing.class);

    public Listing() {
        super("mlcl", "dmap.listing");
    }

    public Iterable<ListingItem> getListingItems() {
        return getMultipleChunks(ListingItem.class);
    }

    public Iterable<ListingItem> getListingItems(Predicate<ListingItem> predicate) {
        return Iterables.filter(getListingItems(), predicate);
    }

    public ListingItem getSingleListingItemContainingClass(final Class<? extends Chunk> clazz) {
        return getSingleListingItem(new Predicate<ListingItem>() {
            @Override
            public boolean apply(ListingItem input) {
                return input.getSpecificChunk(clazz) != null ? true : false;
            }
        });
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public ListingItem getSingleListingItem(Predicate predicate) {
        Iterable<ListingItem> filteredItems = Iterables.filter(getListingItems(), predicate);

        if (Iterables.size(filteredItems) < 1) {
            throw new NoSuchElementException("Found no ListingItems fullfilling predicate");
        }
        if (Iterables.size(filteredItems) > 1) {
            logger.info("Found more than one ListingItem fullfilling predicate - returning the first one");
        }

        return filteredItems.iterator().next();
    }
}