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.jmatio;
025    
026    import java.io.File;
027    import java.io.IOException;
028    import java.util.Map;
029    
030    import org.ujmp.core.Matrix;
031    import org.ujmp.core.exceptions.MatrixException;
032    
033    import com.jmatio.io.MatFileReader;
034    import com.jmatio.types.MLArray;
035    import com.jmatio.types.MLDouble;
036    
037    public class ImportMatrixMAT {
038    
039            public static Matrix fromFile(File file, Object... parameters) throws IOException {
040                    String key = null;
041                    if (parameters != null && parameters.length > 0 && parameters[0] instanceof String) {
042                            key = (String) parameters[0];
043                    }
044                    MatFileReader reader = new MatFileReader();
045                    Map<String, MLArray> map = reader.read(file);
046                    if (key == null) {
047                            key = map.keySet().iterator().next();
048                    }
049                    MLArray array = map.get(key);
050                    if (array == null) {
051                            throw new MatrixException("matrix with label [" + key + "] was not found in .mat file");
052                    } else if (array instanceof MLDouble) {
053                            return new MLDoubleMatrix((MLDouble) array);
054                    } else {
055                            throw new MatrixException("This type is not yet supported: " + array.getClass());
056                    }
057            }
058    
059    }