package org.apache.lucene.analysis.ja.dict;
/*
* 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.io.BufferedInputStream;
import java.io.InputStream;
import java.io.IOException;
import org.apache.lucene.store.InputStreamDataInput;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.util.fst.FST;
import org.apache.lucene.util.fst.PositiveIntOutputs;
/**
* Binary dictionary implementation for a known-word dictionary model:
* Words are encoded into an FST mapping to a list of wordIDs.
*/
public final class TokenInfoDictionary extends BinaryDictionary {
public static final String FST_FILENAME_SUFFIX = "$fst.dat";
private final TokenInfoFST fst;
private TokenInfoDictionary() throws IOException {
super();
IOException priorE = null;
InputStream is = null;
FST<Long> fst = null;
try {
is = getResource(FST_FILENAME_SUFFIX);
is = new BufferedInputStream(is);
fst = new FST<Long>(new InputStreamDataInput(is), PositiveIntOutputs.getSingleton());
} catch (IOException ioe) {
priorE = ioe;
} finally {
IOUtils.closeWhileHandlingException(priorE, is);
}
// TODO: some way to configure?
this.fst = new TokenInfoFST(fst, true);
}
public TokenInfoFST getFST() {
return fst;
}
public static TokenInfoDictionary getInstance() {
return SingletonHolder.INSTANCE;
}
private static class SingletonHolder {
static final TokenInfoDictionary INSTANCE;
static {
try {
INSTANCE = new TokenInfoDictionary();
} catch (IOException ioe) {
throw new RuntimeException("Cannot load TokenInfoDictionary.", ioe);
}
}
}
}