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Lucene example source code file (Query.java)
The Lucene Query.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 java.util.HashSet; import java.util.Set; import org.apache.lucene.index.IndexReader; import org.apache.lucene.index.Term; /** The abstract base class for queries. <p>Instantiable subclasses are: <ul> <li> {@link TermQuery} <li> {@link MultiTermQuery} <li> {@link BooleanQuery} <li> {@link WildcardQuery} <li> {@link PhraseQuery} <li> {@link PrefixQuery} <li> {@link MultiPhraseQuery} <li> {@link FuzzyQuery} <li> {@link TermRangeQuery} <li> {@link NumericRangeQuery} <li> {@link org.apache.lucene.search.spans.SpanQuery} </ul> <p>A parser for queries is contained in: <ul> <li>{@link org.apache.lucene.queryParser.QueryParser QueryParser} </ul> */ public abstract class Query implements java.io.Serializable, Cloneable { private float boost = 1.0f; // query boost factor /** Sets the boost for this query clause to <code>b. Documents * matching this clause will (in addition to the normal weightings) have * their score multiplied by <code>b. */ public void setBoost(float b) { boost = b; } /** Gets the boost for this clause. Documents matching * this clause will (in addition to the normal weightings) have their score * multiplied by <code>b. The boost is 1.0 by default. */ public float getBoost() { return boost; } /** Prints a query to a string, with <code>field assumed to be the * default field and omitted. * <p>The representation used is one that is supposed to be readable * by {@link org.apache.lucene.queryParser.QueryParser QueryParser}. However, * there are the following limitations: * <ul> * <li>If the query was created by the parser, the printed * representation may not be exactly what was parsed. For example, * characters that need to be escaped will be represented without * the required backslash.</li> * <li>Some of the more complicated queries (e.g. span queries) * don't have a representation that can be parsed by QueryParser.</li> * </ul> */ public abstract String toString(String field); /** Prints a query to a string. */ @Override public String toString() { return toString(""); } /** * Expert: Constructs an appropriate Weight implementation for this query. * * <p> * Only implemented by primitive queries, which re-write to themselves. */ public Weight createWeight(Searcher searcher) throws IOException { throw new UnsupportedOperationException(); } /** * Expert: Constructs and initializes a Weight for a <b>top-level query. * @deprecated never ever use this method in {@link Weight} implementations. * Subclasses of {@code Query} should use {@link #createWeight}, instead. */ @Deprecated public final Weight weight(Searcher searcher) throws IOException { return searcher.createNormalizedWeight(this); } /** Expert: called to re-write queries into primitive queries. For example, * a PrefixQuery will be rewritten into a BooleanQuery that consists * of TermQuerys. */ public Query rewrite(IndexReader reader) throws IOException { return this; } /** Expert: called when re-writing queries under MultiSearcher. * * Create a single query suitable for use by all subsearchers (in 1-1 * correspondence with queries). This is an optimization of the OR of * all queries. We handle the common optimization cases of equal * queries and overlapping clauses of boolean OR queries (as generated * by MultiTermQuery.rewrite()). * Be careful overriding this method as queries[0] determines which * method will be called and is not necessarily of the same type as * the other queries. */ public Query combine(Query[] queries) { HashSet<Query> uniques = new HashSet Other Lucene examples (source code examples)Here is a short list of links related to this Lucene Query.java source code file: |
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