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 }