/**
 * Copyright (C) 2001-2017 by RapidMiner and the contributors
 * 
 * Complete list of developers available at our web site:
 * 
 * http://rapidminer.com
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the
 * GNU Affero General Public License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License along with this program.
 * If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.operator.features.transformation;

import java.util.Arrays;


/**
 * This class holds information about one eigenvector and eigenvalue.
 * 
 * @author Ingo Mierswa
 */
public class Eigenvector implements ComponentVector {

	private static final long serialVersionUID = -624000556228376910L;

	private double eigenvalue;
	private double[] eigenvector;

	public Eigenvector(double[] eigenvector, double eigenvalue) {
		this.eigenvector = eigenvector;
		this.eigenvalue = eigenvalue;
	}

	public double[] getEigenvector() {
		return this.eigenvector;
	}

	@Override
	public double getEigenvalue() {
		return this.eigenvalue;
	}

	@Override
	public double[] getVector() {
		return getEigenvector();
	}

	@Override
	public int compareTo(ComponentVector o) {
		return -1 * Double.compare(this.eigenvalue, o.getEigenvalue());
	}

	@Override
	public boolean equals(Object o) {
		if (!(o instanceof Eigenvector)) {
			return false;
		} else {
			Eigenvector ev = (Eigenvector) o;
			for (int i = 0; i < this.eigenvector.length; i++) {
				if (this.eigenvector[i] != ev.eigenvector[i]) {
					return false;
				}
			}
			return this.eigenvalue == ev.eigenvalue;
		}
	}

	@Override
	public int hashCode() {
		return Double.valueOf(eigenvalue).hashCode() ^ Arrays.hashCode(this.eigenvector);
	}
}