| /* |
| * 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.index; |
| |
| |
| import org.apache.lucene.search.MultiTermQuery; // javadocs |
| import org.apache.lucene.util.BytesRef; |
| |
| /** |
| * Subclass of FilteredTermsEnum for enumerating a single term. |
| * <p> |
| * For example, this can be used by {@link MultiTermQuery}s |
| * that need only visit one term, but want to preserve |
| * MultiTermQuery semantics such as {@link |
| * MultiTermQuery#getRewriteMethod}. |
| */ |
| public final class SingleTermsEnum extends FilteredTermsEnum { |
| private final BytesRef singleRef; |
| |
| /** |
| * Creates a new <code>SingleTermsEnum</code>. |
| * <p> |
| * After calling the constructor the enumeration is already pointing to the term, |
| * if it exists. |
| */ |
| public SingleTermsEnum(TermsEnum tenum, BytesRef termText) { |
| super(tenum); |
| singleRef = termText; |
| setInitialSeekTerm(termText); |
| } |
| |
| @Override |
| protected AcceptStatus accept(BytesRef term) { |
| return term.equals(singleRef) ? AcceptStatus.YES : AcceptStatus.END; |
| } |
| |
| } |