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 }