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Java bindings for the Last.fm webservice API
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/*
 * Copyright (c) 2012, the Last.fm Java Project and Committers
 * All rights reserved.
 *
 * Redistribution and use of this software in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above
 *   copyright notice, this list of conditions and the
 *   following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the
 *   following disclaimer in the documentation and/or other
 *   materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package de.umass.lastfm;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import de.umass.xml.DomElement;

/**
 * Provides the binding for the "tasteometer.compare" method.
 *
 * @author Janni Kovacs
 */
public class Tasteometer {

	private Tasteometer() {
	}

	/**
	 * Get a Tasteometer score from two inputs, along with a list of shared artists.
	 *
	 * @param type1 Type of the first input
	 * @param value1 First input value
	 * @param type2 Type of the second input
	 * @param value2 Second input value
	 * @param apiKey The Last.fm API key
	 * @return result of Tasteometer comparison
	 */
	public static ComparisonResult compare(InputType type1, String value1, InputType type2, String value2, String apiKey) {
		Result result = Caller.getInstance().call("tasteometer.compare", apiKey, "type1", type1.name().toLowerCase(), "type2",
						type2.name().toLowerCase(), "value1", value1, "value2", value2);
		if (!result.isSuccessful())
			return null;
		DomElement element = result.getContentElement();
		DomElement re = element.getChild("result");
		float score = Float.parseFloat(re.getChildText("score"));
		List artists = new ArrayList();
		for (DomElement domElement : re.getChild("artists").getChildren("artist")) {
			artists.add(ResponseBuilder.buildItem(domElement, Artist.class));
		}
		return new ComparisonResult(score, artists);
	}

	/**
	 * Contains the result of a tasteometer comparison, i.e. the score (0.0-1.0) and a list of
	 * shared artists.
	 */
	public static class ComparisonResult {

		private float score;
		private Collection matches;

		ComparisonResult(float score, Collection matches) {
			this.score = score;
			this.matches = matches;
		}

		/**
		 * Returns a list of artist matches, i.e. artists both partys listen to.
		 *
		 * @return artist matches
		 */
		public Collection getMatches() {
			return matches;
		}

		/**
		 * Returns the compatability score between 0.0 (no compatability) and 1.0 (highest compatability).
		 *
		 * @return the score
		 */
		public float getScore() {
			return score;
		}
	}

	/**
	 * Specifies the type of the input for the {@linkplain Tasteometer#compare Tasteometer.compare} operation.
	 */
	public enum InputType {
		USER,
		ARTISTS,
		MYSPACE
	}
}