org.languagetool.dev.dumpcheck.WikipediaSentenceExtractor.java Source code

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Here is the source code for org.languagetool.dev.dumpcheck.WikipediaSentenceExtractor.java

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/* LanguageTool, a natural language style checker
 * Copyright (C) 2014 Daniel Naber (http://www.danielnaber.de)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
 * USA
 */
package org.languagetool.dev.dumpcheck;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.compress.compressors.CompressorException;
import org.apache.commons.compress.compressors.CompressorStreamFactory;
import org.languagetool.Language;
import org.languagetool.Languages;

/**
 * Command line tool to extract sentences from a (optionally bz2-compressed) Wikipedia XML dump.
 * @since 2.6
 */
class WikipediaSentenceExtractor {

    private void extract(Language language, String xmlDumpPath) throws IOException, CompressorException {
        try (FileInputStream fis = new FileInputStream(xmlDumpPath);
                BufferedInputStream bis = new BufferedInputStream(fis)) {
            InputStream input;
            if (xmlDumpPath.endsWith(".bz2")) {
                input = new CompressorStreamFactory().createCompressorInputStream(bis);
            } else if (xmlDumpPath.endsWith(".xml")) {
                input = bis;
            } else {
                throw new IllegalArgumentException("Unknown file name, expected '.xml' or '.bz2': " + xmlDumpPath);
            }
            int sentenceCount = 0;
            WikipediaSentenceSource source = new WikipediaSentenceSource(input, language);
            while (source.hasNext()) {
                String sentence = source.next().getText();
                if (skipSentence(sentence)) {
                    continue;
                }
                System.out.println(sentence);
                sentenceCount++;
                if (sentenceCount % 1000 == 0) {
                    System.err.println("Exporting sentence #" + sentenceCount + "...");
                }
            }
        }
    }

    private boolean skipSentence(String sentence) {
        return sentence.trim().length() == 0 || Character.isLowerCase(sentence.trim().charAt(0));
    }

    public static void main(String[] args) throws IOException, CompressorException {
        if (args.length != 2) {
            System.out.println("Usage: " + WikipediaSentenceExtractor.class.getSimpleName()
                    + " <langCode> <wikipediaXmlDump>");
            System.exit(1);
        }
        WikipediaSentenceExtractor extractor = new WikipediaSentenceExtractor();
        extractor.extract(Languages.getLanguageForShortCode(args[0]), args[1]);
    }
}