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.doublematrix.calculation.general.missingvalues;
025    
026    import java.lang.reflect.Constructor;
027    
028    import org.ujmp.core.Matrix;
029    import org.ujmp.core.doublematrix.calculation.AbstractDoubleCalculation;
030    import org.ujmp.core.doublematrix.calculation.DoubleCalculation;
031    import org.ujmp.core.doublematrix.calculation.general.missingvalues.Impute.ImputationMethod;
032    import org.ujmp.core.exceptions.MatrixException;
033    
034    public class ImputeLS extends AbstractDoubleCalculation {
035            private static final long serialVersionUID = 6803633047911888483L;
036    
037            private Matrix imp = null;
038    
039            private ImputationMethod method = null;
040    
041            public ImputeLS(Matrix matrix, ImputationMethod method) {
042                    super(matrix);
043                    this.method = method;
044            }
045    
046            public static boolean isAvailable() {
047                    try {
048                            Class.forName("Impute");
049                    } catch (ClassNotFoundException e) {
050                            return false;
051                    }
052                    return true;
053            }
054    
055            
056            public double getDouble(long... coordinates) throws MatrixException {
057                    if (imp == null) {
058                            try {
059    
060                                    DoubleCalculation calc = null;
061    
062                                    try {
063                                            if (calc == null) {
064                                                    Class<?> c = Class.forName("org.ujmp.lsimpute.LSImpute");
065                                                    Constructor<?> con = c.getConstructor(Matrix.class, ImputationMethod.class);
066    
067                                                    calc = (DoubleCalculation) con.newInstance(getSource(), method);
068                                            }
069                                    } catch (ClassNotFoundException e) {
070                                    }
071    
072                                    if (calc == null) {
073                                            throw new MatrixException("could not find LSimpute.jar in your classpath");
074                                    }
075    
076                                    imp = calc.calcNew();
077    
078                            } catch (Exception e) {
079                                    throw new MatrixException(e);
080                            }
081                    }
082                    return imp.getAsDouble(coordinates);
083            }
084    }