001    /*
002     * Copyright (C) 2008-2010 by Holger Arndt
003     *
004     * This file is part of the Universal Java Matrix Package (UJMP).
005     * See the NOTICE file distributed with this work for additional
006     * information regarding copyright ownership and licensing.
007     *
008     * UJMP is free software; you can redistribute it and/or modify
009     * it under the terms of the GNU Lesser General Public License as
010     * published by the Free Software Foundation; either version 2
011     * of the License, or (at your option) any later version.
012     *
013     * UJMP is distributed in the hope that it will be useful,
014     * but WITHOUT ANY WARRANTY; without even the implied warranty of
015     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
016     * GNU Lesser General Public License for more details.
017     *
018     * You should have received a copy of the GNU Lesser General Public
019     * License along with UJMP; if not, write to the
020     * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
021     * Boston, MA  02110-1301  USA
022     */
023    
024    package org.ujmp.core.objectmatrix.calculation;
025    
026    import org.ujmp.core.Matrix;
027    import org.ujmp.core.exceptions.MatrixException;
028    
029    public class Triu extends AbstractObjectCalculation {
030            private static final long serialVersionUID = 758577959954446767L;
031    
032            private int k = 0;
033    
034            public Triu(Matrix m, int k) {
035                    super(m);
036                    this.k = k;
037            }
038    
039            public Object getObject(long... coordinates) throws MatrixException {
040                    if (coordinates[ROW] <= coordinates[COLUMN] - k) {
041                            return getSource().getAsObject(coordinates);
042                    } else {
043                            return null;
044                    }
045            }
046    
047    }