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ConnectionCosts.java
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ConnectionCosts.java
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/*
* 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.
*/
package org.apache.lucene.analysis.ja.dict;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import org.apache.lucene.util.IOSupplier;
import org.apache.lucene.util.IOUtils;
/** n-gram connection cost data */
public final class ConnectionCosts extends org.apache.lucene.analysis.morph.ConnectionCosts {
/**
* Create a {@link ConnectionCosts} from an external resource path.
*
* @param connectionCostsFile where to load connection costs resource
* @throws IOException if resource was not found or broken
*/
public ConnectionCosts(Path connectionCostsFile) throws IOException {
this(() -> Files.newInputStream(connectionCostsFile));
}
private ConnectionCosts() throws IOException {
this(ConnectionCosts::getClassResource);
}
/**
* Create a {@link ConnectionCosts} from an input stream supplier.
*
* @param connectionCostResource supplies a stream where connection costs resource can be read
* @throws IOException if the supplied stream could not be read
*/
public ConnectionCosts(IOSupplier<InputStream> connectionCostResource) throws IOException {
super(
connectionCostResource, DictionaryConstants.CONN_COSTS_HEADER, DictionaryConstants.VERSION);
}
private static InputStream getClassResource() throws IOException {
final String resourcePath = ConnectionCosts.class.getSimpleName() + FILENAME_SUFFIX;
return IOUtils.requireResourceNonNull(
ConnectionCosts.class.getResourceAsStream(resourcePath), resourcePath);
}
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);
}
}
}
}