package org.apache.lucene.analysis.ja.util;
/*
* 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.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.lucene.analysis.ja.dict.ConnectionCosts;
import org.apache.lucene.codecs.CodecUtil;
import org.apache.lucene.store.DataOutput;
import org.apache.lucene.store.OutputStreamDataOutput;
public final class ConnectionCostsWriter {
private final short[][] costs; // array is backward IDs first since get is called using the same backward ID consecutively. maybe doesn't matter.
private final int forwardSize;
private final int backwardSize;
/**
* Constructor for building. TODO: remove write access
*/
public ConnectionCostsWriter(int forwardSize, int backwardSize) {
this.forwardSize = forwardSize;
this.backwardSize = backwardSize;
this.costs = new short[backwardSize][forwardSize];
}
public void add(int forwardId, int backwardId, int cost) {
this.costs[backwardId][forwardId] = (short)cost;
}
public void write(String baseDir) throws IOException {
String filename = baseDir + File.separator +
ConnectionCosts.class.getName().replace('.', File.separatorChar) + ConnectionCosts.FILENAME_SUFFIX;
new File(filename).getParentFile().mkdirs();
OutputStream os = new FileOutputStream(filename);
try {
os = new BufferedOutputStream(os);
final DataOutput out = new OutputStreamDataOutput(os);
CodecUtil.writeHeader(out, ConnectionCosts.HEADER, ConnectionCosts.VERSION);
out.writeVInt(forwardSize);
out.writeVInt(backwardSize);
int last = 0;
assert costs.length == backwardSize;
for (short[] a : costs) {
assert a.length == forwardSize;
for (int i = 0; i < a.length; i++) {
int delta = (int)a[i] - last;
out.writeVInt((delta >> 31) ^ (delta << 1));
last = a[i];
}
}
} finally {
os.close();
}
}
}