org.apache.lucene.search.spell.PlainTextDictionary Maven / Gradle / Ivy
package org.apache.lucene.search.spell;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.util.Comparator;
import java.io.*;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.BytesRefIterator;
import org.apache.lucene.util.IOUtils;
/**
* Dictionary represented by a text file.
*
* Format allowed: 1 word per line:
* word1
* word2
* word3
*/
public class PlainTextDictionary implements Dictionary {
private BufferedReader in;
public PlainTextDictionary(File file) throws FileNotFoundException {
in = new BufferedReader(new FileReader(file));
}
public PlainTextDictionary(InputStream dictFile) {
in = new BufferedReader(new InputStreamReader(dictFile));
}
/**
* Creates a dictionary based on a reader.
*/
public PlainTextDictionary(Reader reader) {
in = new BufferedReader(reader);
}
public BytesRefIterator getWordsIterator() throws IOException {
return new FileIterator();
}
final class FileIterator implements BytesRefIterator {
private boolean done = false;
private final BytesRef spare = new BytesRef();
//@Override - not until Java 6
public BytesRef next() throws IOException {
if (done) {
return null;
}
boolean success = false;
BytesRef result;
try {
String line;
if ((line = in.readLine()) != null) {
spare.copyChars(line);
result = spare;
} else {
done = true;
IOUtils.close(in);
result = null;
}
success = true;
} finally {
if (!success) {
IOUtils.closeWhileHandlingException(in);
}
}
return result;
}
//@Override - not until Java 6
public Comparator getComparator() {
return null;
}
}
}