package org.apache.lucene.collation.tokenattributes;
/*
* 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 org.apache.lucene.analysis.tokenattributes.CharTermAttributeImpl;
import org.apache.lucene.util.BytesRef;
import com.ibm.icu.text.Collator;
import com.ibm.icu.text.RawCollationKey;
/**
* Extension of {@link CharTermAttributeImpl} that encodes the term
* text as a binary Unicode collation key instead of as UTF-8 bytes.
*/
public class ICUCollatedTermAttributeImpl extends CharTermAttributeImpl {
private final Collator collator;
private final RawCollationKey key = new RawCollationKey();
/**
* Create a new ICUCollatedTermAttributeImpl
* @param collator Collation key generator
*/
public ICUCollatedTermAttributeImpl(Collator collator) {
// clone the collator: see http://userguide.icu-project.org/collation/architecture
try {
this.collator = (Collator) collator.clone();
} catch (CloneNotSupportedException e) {
throw new RuntimeException(e);
}
}
@Override
public int fillBytesRef() {
BytesRef bytes = getBytesRef();
collator.getRawCollationKey(toString(), key);
bytes.bytes = key.bytes;
bytes.offset = 0;
bytes.length = key.size;
return bytes.hashCode();
}
}