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    import org.ujmp.core.util.MathUtil;
030    import org.ujmp.core.util.VerifyUtil;
031    
032    public class Reshape extends AbstractObjectCalculation {
033            private static final long serialVersionUID = -4298270756453090584L;
034    
035            private final long[] newSize;
036    
037            private final long[] oldSize;
038    
039            public Reshape(Matrix source, long... newSize) {
040                    super(source);
041                    this.newSize = newSize;
042                    this.oldSize = source.getSize();
043                    VerifyUtil.assertEquals(Coordinates.product(oldSize), Coordinates.product(newSize),
044                                    "new matrix must have the same number of cells");
045            }
046    
047            public long[] getSize() {
048                    return newSize;
049            }
050    
051            public Object getObject(long... coordinates) throws MatrixException {
052                    long index = MathUtil.pos2IndexColumnMajor(newSize, coordinates);
053                    long[] oldPos = MathUtil.index2PosColumnMajor(oldSize, index);
054                    return getSource().getAsObject(oldPos);
055            }
056    
057            @Override
058            public void setObject(Object value, long... coordinates) throws MatrixException {
059                    long index = MathUtil.pos2IndexColumnMajor(newSize, coordinates);
060                    long[] oldPos = MathUtil.index2PosColumnMajor(oldSize, index);
061                    getSource().setAsObject(value, oldPos);
062            }
063    
064    }