TextDirectoryToArff.java Source code

Introduction

Here is the source code for TextDirectoryToArff.java

Source

/*
 *    TextDirectoryToArff.java
 *    Copyright (C) 2002 Richard Kirkby
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

import java.io.*;
import weka.core.*;

/**
 * Builds an arff dataset from the documents in a given directory.
 * Assumes that the file names for the documents end with ".txt".
 *
 * Usage:<p>
 *
 * TextDirectoryToArff <directory path><p>
 *
 * @author Richard Kirkby (rkirkby at cs.waikato.ac.nz)
 * @version 1.0
 */
public class TextDirectoryToArff {

    public Instances createDataset(String directoryPath) throws Exception {

        FastVector atts = new FastVector(2);
        atts.addElement(new Attribute("filename", (FastVector) null));
        atts.addElement(new Attribute("contents", (FastVector) null));
        Instances data = new Instances("text_files_in_" + directoryPath, atts, 0);

        File dir = new File(directoryPath);
        String[] files = dir.list();
        for (int i = 0; i < files.length; i++) {
            if (files[i].endsWith(".txt")) {
                try {
                    double[] newInst = new double[2];
                    newInst[0] = (double) data.attribute(0).addStringValue(files[i]);
                    File txt = new File(directoryPath + File.separator + files[i]);
                    InputStreamReader is;
                    is = new InputStreamReader(new FileInputStream(txt));
                    StringBuffer txtStr = new StringBuffer();
                    int c;
                    while ((c = is.read()) != -1) {
                        txtStr.append((char) c);
                    }
                    newInst[1] = (double) data.attribute(1).addStringValue(txtStr.toString());
                    data.add(new Instance(1.0, newInst));
                } catch (Exception e) {
                    //System.err.println("failed to convert file: " + directoryPath + File.separator + files[i]);
                }
            }
        }
        return data;
    }

    public static void main(String[] args) {

        if (args.length == 1) {
            TextDirectoryToArff tdta = new TextDirectoryToArff();
            try {
                Instances dataset = tdta.createDataset(args[0]);
                System.out.println(dataset);
            } catch (Exception e) {
                System.err.println(e.getMessage());
                e.printStackTrace();
            }
        } else {
            System.out.println("Usage: java TextDirectoryToArff <directory name>");
        }
    }
}