org.languagetool.dev.index.Indexer Maven / Gradle / Ivy
/* LanguageTool, a natural language style checker
* Copyright (C) 2005 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.index;
import java.io.*;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.miscellaneous.PerFieldAnalyzerWrapper;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.FieldType;
import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.languagetool.JLanguageTool;
import org.languagetool.Language;
import org.languagetool.Languages;
import org.languagetool.dev.dumpcheck.Sentence;
import org.languagetool.tokenizers.SentenceTokenizer;
import static org.languagetool.dev.index.PatternRuleQueryBuilder.FIELD_NAME;
import static org.languagetool.dev.index.PatternRuleQueryBuilder.FIELD_NAME_LOWERCASE;
import static org.languagetool.dev.index.PatternRuleQueryBuilder.SOURCE_FIELD_NAME;
/**
* A class with a main() method that takes a text file and indexes its sentences, including POS tags
*
* @author Tao Lin, Miaojuan Dai
*/
public class Indexer implements AutoCloseable {
static final String TITLE_FIELD_NAME = "title";
private final IndexWriter writer;
private final SentenceTokenizer sentenceTokenizer;
public Indexer(Directory dir, Language language) {
try {
final Analyzer analyzer = getAnalyzer(language);
final IndexWriterConfig writerConfig = getIndexWriterConfig(analyzer);
writerConfig.setOpenMode(OpenMode.CREATE);
writer = new IndexWriter(dir, writerConfig);
sentenceTokenizer = language.getSentenceTokenizer();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static void main(String[] args) throws IOException {
ensureCorrectUsageOrExit(args);
run(args[0], args[1], args[2]);
}
static Analyzer getAnalyzer(Language language) {
final Map analyzerMap = new HashMap<>();
analyzerMap.put(FIELD_NAME, new LanguageToolAnalyzer(new JLanguageTool(language), false));
analyzerMap.put(FIELD_NAME_LOWERCASE, new LanguageToolAnalyzer(new JLanguageTool(language), true));
return new PerFieldAnalyzerWrapper(new DoNotUseAnalyzer(), analyzerMap);
}
static IndexWriterConfig getIndexWriterConfig(Analyzer analyzer) {
return new IndexWriterConfig(analyzer);
}
private static void ensureCorrectUsageOrExit(String[] args) {
if (args.length != 3) {
System.err.println("Usage: Indexer ");
System.err.println("\ttextFile path to a text file to be indexed (line end implies sentence end)");
System.err.println("\tindexDir path to a directory storing the index");
System.err.println("\tlanguageCode short language code, e.g. en for English");
System.exit(1);
}
}
private static void run(String textFile, String indexDir, String languageCode) throws IOException {
final File file = new File(textFile);
if (!file.exists() || !file.canRead()) {
System.out.println("Text file '" + file.getAbsolutePath()
+ "' does not exist or is not readable, please check the path");
System.exit(1);
}
try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
System.out.println("Indexing to directory '" + indexDir + "'...");
try (FSDirectory directory = FSDirectory.open(new File(indexDir).toPath())) {
final Language language = Languages.getLanguageForShortName(languageCode);
try (Indexer indexer = new Indexer(directory, language)) {
indexer.indexText(reader);
}
}
}
System.out.println("Index complete!");
}
public static void run(String content, Directory dir, Language language) throws IOException {
final BufferedReader br = new BufferedReader(new StringReader(content));
try (Indexer indexer = new Indexer(dir, language)) {
indexer.indexText(br);
}
}
public void indexSentence(Sentence sentence, int docCount) throws IOException {
final BufferedReader reader = new BufferedReader(new StringReader(sentence.getText()));
String line;
while ((line = reader.readLine()) != null) {
add(line, sentence.getSource(), sentence.getTitle(), docCount);
}
}
public void indexText(BufferedReader reader) throws IOException {
String line;
StringBuilder paragraph = new StringBuilder();
while ((line = reader.readLine()) != null) {
if (!(line.equals("")) && paragraph.length() + line.length() < Integer.MAX_VALUE) {
paragraph.append(line).append("\n");
} else {
final List sentences = sentenceTokenizer.tokenize(paragraph.toString());
for (String sentence : sentences) {
add(sentence.replaceAll(" \n"," "), null, null, -1);
}
if (paragraph.length() + line.length() >= Integer.MAX_VALUE) {
final List last_sentences = sentenceTokenizer.tokenize(line);
for (String sentence : last_sentences) {
add(sentence, null, null, -1);
}
}
paragraph.setLength(0);
}
}
if (paragraph.length() > 0) {
final List sentences = sentenceTokenizer.tokenize(paragraph.toString());
for (String sentence : sentences) {
add(sentence, null, null, -1);
}
}
}
public void add(Document doc) throws IOException {
writer.addDocument(doc);
}
private void add(String sentence, String source, String title, int docCount) throws IOException {
final Document doc = new Document();
final FieldType type = new FieldType();
type.setStored(true);
type.setIndexOptions(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS);
type.setTokenized(true);
doc.add(new Field(FIELD_NAME, sentence, type));
doc.add(new Field(FIELD_NAME_LOWERCASE, sentence, type));
if (docCount != -1) {
final FieldType countType = new FieldType();
countType.setStored(true);
countType.setIndexOptions(IndexOptions.NONE);
doc.add(new Field("docCount", String.valueOf(docCount), countType));
}
if (title != null) {
final FieldType titleType = new FieldType();
titleType.setStored(true);
titleType.setIndexOptions(IndexOptions.NONE);
titleType.setTokenized(false);
doc.add(new Field(TITLE_FIELD_NAME, title, titleType));
}
if (source != null) {
final FieldType sourceType = new FieldType();
sourceType.setStored(true);
sourceType.setIndexOptions(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS);
sourceType.setTokenized(false);
doc.add(new Field(SOURCE_FIELD_NAME, source, sourceType));
}
writer.addDocument(doc);
}
@Override
public void close() throws IOException {
writer.close();
}
}
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