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The S-Space Package is a collection of algorithms for building Semantic Spaces as well as a highly-scalable library for designing new distributional semantics algorithms. Distributional algorithms process text corpora and represent the semantic for words as high dimensional feature vectors. This package also includes matrices, vectors, and numerous clustering algorithms. These approaches are known by many names, such as word spaces, semantic spaces, or distributed semantics and rest upon the Distributional Hypothesis: words that appear in similar contexts have similar meanings.

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/*
 * Copyright 2010 Keith Stevens 
 *
 * This file is part of the S-Space package and is covered under the terms and
 * conditions therein.
 *
 * The S-Space package is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation and distributed hereunder to you.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND NO REPRESENTATIONS OR WARRANTIES,
 * EXPRESS OR IMPLIED ARE MADE.  BY WAY OF EXAMPLE, BUT NOT LIMITATION, WE MAKE
 * NO REPRESENTATIONS OR WARRANTIES OF MERCHANT- ABILITY OR FITNESS FOR ANY
 * PARTICULAR PURPOSE OR THAT THE USE OF THE LICENSED SOFTWARE OR DOCUMENTATION
 * WILL NOT INFRINGE ANY THIRD PARTY PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER
 * RIGHTS.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see .
 */

package edu.ucla.sspace.tools;

import edu.ucla.sspace.common.ArgOptions;

import edu.ucla.sspace.text.DocumentPreprocessor;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.PrintWriter;


/**
 * An informal tool which cleans the 20
 * NewsGroups corpus.  This cleaner removes all of the meta data for each
 * newsgroup posting.  Email characters, such as "<" are separated from normal
 * text.  This cleaner is expected to be run with the "20_newsgroups" directory
 * that is provided in the standard tarball distributed by UCI.  Output will be
 * written to a specified file where each line will contain all the contents of
 * a single posting.
 *
 * @author Keith Stevens
 */
public class TwentyNewsGroupsCleaner {

    public static void main(String[] args) throws Exception{
        if (args.length != 2) {
            System.out.println(
                    "usage: java TwentyNewsGroupCleaner  ");
            System.exit(1);
        }

        DocumentPreprocessor processor = new DocumentPreprocessor();
        PrintWriter pw = new PrintWriter(args[1]);

        File baseNGDir = new File(args[0]);
        // Iterate over the newsgroup directories in the main directory.
        for (File newsGroupDir : baseNGDir.listFiles()) {

            // Skip any non-directories.
            if (!newsGroupDir.isDirectory())
                continue;

            // Iterate over the individual postings in each newsgroup.
            for (File newsGroupEntry : newsGroupDir.listFiles()) {
                BufferedReader br = 
                    new BufferedReader(new FileReader(newsGroupEntry));
                StringBuilder sb = new StringBuilder();
                boolean startedContent = false;

                // Scan through the posting to find the "Lines" line.  This line
                // marks the beginning of the real newsgroup data.
                for (String line = null; (line = br.readLine()) != null; ) {
                    if (startedContent)
                        sb.append(line).append(" ");
                    if (line.startsWith("Lines:"))
                        startedContent = true;
                }

                // Clean and write the posting's content to the output file.
                sb.append("\n");
                String cleanedContent = processor.process(sb.toString());
                System.out.println(newsGroupEntry.getAbsolutePath());
                pw.printf("%s\n", cleanedContent);
                br.close();
            }
        }
        pw.close();
    }
}