org.apache.lucene.collation.tokenattributes.CollatedTermAttributeImpl Maven / Gradle / Ivy
/*
* 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.collation.tokenattributes;
import java.text.Collator;
import org.apache.lucene.analysis.tokenattributes.CharTermAttributeImpl;
import org.apache.lucene.util.BytesRef;
/**
* Extension of {@link CharTermAttributeImpl} that encodes the term
* text as a binary Unicode collation key instead of as UTF-8 bytes.
*/
public class CollatedTermAttributeImpl extends CharTermAttributeImpl {
private final Collator collator;
/**
* Create a new CollatedTermAttributeImpl
* @param collator Collation key generator
*/
public CollatedTermAttributeImpl(Collator collator) {
// clone in case JRE doesn't properly sync,
// or to reduce contention in case they do
this.collator = (Collator) collator.clone();
}
@Override
public BytesRef getBytesRef() {
final BytesRef ref = this.builder.get();
ref.bytes = collator.getCollationKey(toString()).toByteArray();
ref.offset = 0;
ref.length = ref.bytes.length;
return ref;
}
}