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Lucene example source code file (PrefixTermEnum.java)
The Lucene PrefixTermEnum.java source codepackage 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 java.io.IOException; import org.apache.lucene.index.IndexReader; import org.apache.lucene.index.Term; /** * Subclass of FilteredTermEnum for enumerating all terms that match the * specified prefix filter term. * <p> * Term enumerations are always ordered by Term.compareTo(). Each term in * the enumeration is greater than all that precede it. * */ public class PrefixTermEnum extends FilteredTermEnum { private final Term prefix; private boolean endEnum = false; public PrefixTermEnum(IndexReader reader, Term prefix) throws IOException { this.prefix = prefix; setEnum(reader.terms(new Term(prefix.field(), prefix.text()))); } @Override public float difference() { return 1.0f; } @Override protected boolean endEnum() { return endEnum; } protected Term getPrefixTerm() { return prefix; } @Override protected boolean termCompare(Term term) { if (term.field() == prefix.field() && term.text().startsWith(prefix.text())) { return true; } endEnum = true; return false; } } Other Lucene examples (source code examples)Here is a short list of links related to this Lucene PrefixTermEnum.java source code file: |
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