1 package org.apache.lucene.search;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
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9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
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20 import java.io.IOException;
22 import org.apache.lucene.index.IndexReader;
23 import org.apache.lucene.index.Term;
26 * Subclass of FilteredTermEnum for enumerating a single term.
28 * This can be used by {@link MultiTermQuery}s that need only visit one term,
29 * but want to preserve MultiTermQuery semantics such as
30 * {@link MultiTermQuery#rewriteMethod}.
32 public class SingleTermEnum extends FilteredTermEnum {
33 private Term singleTerm;
34 private boolean endEnum = false;
37 * Creates a new <code>SingleTermEnum</code>.
39 * After calling the constructor the enumeration is already pointing to the term,
42 public SingleTermEnum(IndexReader reader, Term singleTerm) throws IOException {
44 this.singleTerm = singleTerm;
45 setEnum(reader.terms(singleTerm));
49 public float difference() {
54 protected boolean endEnum() {
59 protected boolean termCompare(Term term) {
60 if (term.equals(singleTerm)) {