package org.apache.lucene.search;
/*
* 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.index.FilteredTermsEnum;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.StringHelper;
/**
* Subclass of FilteredTermEnum for enumerating all terms that match the
* specified prefix filter term.
* <p>Term enumerations are always ordered by
* {@link BytesRef#compareTo}. Each term in the enumeration is
* greater than all that precede it.</p>
*/
public class PrefixTermsEnum extends FilteredTermsEnum {
private final BytesRef prefixRef;
public PrefixTermsEnum(TermsEnum tenum, BytesRef prefixText) {
super(tenum);
setInitialSeekTerm(this.prefixRef = prefixText);
}
@Override
protected AcceptStatus accept(BytesRef term) {
if (StringHelper.startsWith(term, prefixRef)) {
return AcceptStatus.YES;
} else {
return AcceptStatus.END;
}
}
}