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.IOException;
import java.io.InputStream;
import org.apache.lucene.codecs.CodecUtil;
import org.apache.lucene.store.DataInput;
import org.apache.lucene.store.InputStreamDataInput;
import org.apache.lucene.util.IOUtils;
/**
* n-gram connection cost data
*/
public final class ConnectionCosts {
public static final String FILENAME_SUFFIX = ".dat";
public static final String HEADER = "kuromoji_cc";
public static final int VERSION = 1;
private final short[][] costs; // array is backward IDs first since get is called using the same backward ID consecutively. maybe doesn't matter.
private ConnectionCosts() throws IOException {
IOException priorE = null;
InputStream is = null;
short[][] costs = null;
try {
is = BinaryDictionary.getClassResource(getClass(), FILENAME_SUFFIX);
is = new BufferedInputStream(is);
final DataInput in = new InputStreamDataInput(is);
CodecUtil.checkHeader(in, HEADER, VERSION, VERSION);
int forwardSize = in.readVInt();
int backwardSize = in.readVInt();
costs = new short[backwardSize][forwardSize];
int accum = 0;
for (int j = 0; j < costs.length; j++) {
final short[] a = costs[j];
for (int i = 0; i < a.length; i++) {
int raw = in.readVInt();
accum += (raw >>> 1) ^ -(raw & 1);
a[i] = (short)accum;
}
}
} catch (IOException ioe) {
priorE = ioe;
} finally {
IOUtils.closeWhileHandlingException(priorE, is);
}
this.costs = costs;
}
public int get(int forwardId, int backwardId) {
return costs[backwardId][forwardId];
}
public static ConnectionCosts getInstance() {
return SingletonHolder.INSTANCE;
}
private static class SingletonHolder {
static final ConnectionCosts INSTANCE;
static {
try {
INSTANCE = new ConnectionCosts();
} catch (IOException ioe) {
throw new RuntimeException("Cannot load ConnectionCosts.", ioe);
}
}
}
}