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.Coordinates;
027    import org.ujmp.core.Matrix;
028    import org.ujmp.core.exceptions.MatrixException;
029    
030    public class Swap extends AbstractObjectCalculation {
031            private static final long serialVersionUID = -6182660661622835051L;
032    
033            private long pos1 = 0;
034            private long pos2 = 0;
035    
036            public Swap(int dimension, long pos1, long pos2, Matrix m) {
037                    super(dimension, m);
038                    this.pos1 = pos1;
039                    this.pos2 = pos2;
040            }
041    
042            
043            public Object getObject(long... coordinates) throws MatrixException {
044                    if (pos1 == pos2) {
045                            return getSource().getAsObject(coordinates);
046                    } else if (coordinates[getDimension()] == pos1) {
047                            coordinates = Coordinates.copyOf(coordinates);
048                            coordinates[getDimension()] = pos2;
049                            return getSource().getAsObject(coordinates);
050                    } else if (coordinates[getDimension()] == pos2) {
051                            coordinates = Coordinates.copyOf(coordinates);
052                            coordinates[getDimension()] = pos1;
053                            return getSource().getAsObject(coordinates);
054                    } else {
055                            return getSource().getAsObject(coordinates);
056                    }
057            }
058    
059            public final Matrix calcOrig() throws MatrixException {
060                    Matrix m = getSource();
061                    if (m.getDimensionCount() > 2) {
062                            throw new MatrixException("ORIG works only for 2d matrices, use LINK or COPY instead");
063                    }
064    
065                    if (getDimension() == Matrix.ROW) {
066                            long length = m.getColumnCount();
067                            for (long i = 0; i < length; i++) {
068                                    Object temp = m.getAsObject(pos1, i);
069                                    m.setAsObject(m.getAsObject(pos2, i), pos1, i);
070                                    m.setAsObject(temp, pos2, i);
071                            }
072                    } else if (getDimension() == Matrix.COLUMN) {
073                            long length = m.getRowCount();
074                            for (long i = 0; i < length; i++) {
075                                    Object temp = m.getAsObject(i, pos1);
076                                    m.setAsObject(m.getAsObject(i, pos2), i, pos1);
077                                    m.setAsObject(temp, i, pos2);
078                            }
079                    } else {
080                            throw new MatrixException("this only works for rows or columns");
081                    }
082    
083                    return getSource();
084            }
085    }