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.io;
025    
026    import java.io.BufferedReader;
027    import java.io.File;
028    import java.io.FileReader;
029    import java.io.IOException;
030    import java.io.InputStream;
031    import java.io.InputStreamReader;
032    import java.io.LineNumberReader;
033    import java.io.Reader;
034    
035    import org.ujmp.core.Matrix;
036    import org.ujmp.core.MatrixFactory;
037    import org.ujmp.core.util.StringUtil;
038    
039    public abstract class ImportMatrixM {
040    
041            /**
042             * Creates a DefaultDenseStringMatrix2D from a given String. The string
043             * contains the rows of the matrix separated by semicolons or new lines. The
044             * columns of the matrix are separated by spaces or commas. All types of
045             * brackets are ignored.
046             * <p>
047             * Examples: "[1 2 3; 4 5 6]" or "(test1,test2);(test3,test4)"
048             * 
049             * @param string
050             *            the string to parse
051             * @return a StringMatrix with the desired values
052             */
053            public static Matrix fromString(String string, Object... parameters) {
054                    string = string.replaceAll(StringUtil.BRACKETS, "");
055                    String[] rows = string.split(StringUtil.SEMICOLONORNEWLINE);
056                    String[] cols = rows[0].split(StringUtil.COLONORSPACES);
057                    Object[][] values = new String[rows.length][cols.length];
058                    for (int r = 0; r < rows.length; r++) {
059                            cols = rows[r].split(StringUtil.COLONORSPACES);
060                            for (int c = 0; c < cols.length; c++) {
061                                    values[r][c] = cols[c];
062                            }
063                    }
064                    return MatrixFactory.linkToArray(values);
065            }
066    
067            public static Matrix fromFile(File file, Object... parameters) throws IOException {
068                    Reader reader = new BufferedReader(new FileReader(file));
069                    Matrix matrix = fromReader(reader, parameters);
070                    reader.close();
071                    return matrix;
072            }
073    
074            public static Matrix fromStream(InputStream stream, Object... parameters) throws IOException {
075                    InputStreamReader r = new InputStreamReader(stream);
076                    Matrix matrix = fromReader(r, parameters);
077                    r.close();
078                    return matrix;
079            }
080    
081            public static Matrix fromReader(Reader reader, Object... parameters) throws IOException {
082                    String EOL = System.getProperty("line.separator");
083                    StringBuilder sb = new StringBuilder();
084                    LineNumberReader lr = new LineNumberReader(reader);
085                    String line = null;
086                    while ((line = lr.readLine()) != null) {
087                            sb.append(line + EOL);
088                    }
089                    return fromString(sb.toString(), parameters);
090            }
091    
092    }