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package org.apache.lucene.search;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.io.IOException;
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import org.apache.lucene.index.IndexReader;
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import org.apache.lucene.index.Term;
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* Subclass of FilteredTermEnum for enumerating a single term.
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* This can be used by {@link MultiTermQuery}s that need only visit one term,
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* but want to preserve MultiTermQuery semantics such as
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* {@link MultiTermQuery#rewriteMethod}.
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public class SingleTermEnum extends FilteredTermEnum {
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private Term singleTerm;
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private boolean endEnum = false;
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* Creates a new <code>SingleTermEnum</code>.
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* After calling the constructor the enumeration is already pointing to the term,
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public SingleTermEnum(IndexReader reader, Term singleTerm) throws IOException {
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this.singleTerm = singleTerm;
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setEnum(reader.terms(singleTerm));
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public float difference() {
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protected boolean endEnum() {
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protected boolean termCompare(Term term) {
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if (term.equals(singleTerm)) {