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Lucene example source code file (ReutersQueryMaker.java)
The Lucene ReutersQueryMaker.java source codepackage org.apache.lucene.benchmark.byTask.feeds; /** * 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 org.apache.lucene.analysis.Analyzer; import org.apache.lucene.index.Term; import org.apache.lucene.queryParser.QueryParser; import org.apache.lucene.search.Query; import org.apache.lucene.search.WildcardQuery; import org.apache.lucene.search.spans.SpanFirstQuery; import org.apache.lucene.search.spans.SpanNearQuery; import org.apache.lucene.search.spans.SpanQuery; import org.apache.lucene.search.spans.SpanTermQuery; import org.apache.lucene.benchmark.byTask.tasks.NewAnalyzerTask; import org.apache.lucene.util.Version; import java.util.ArrayList; import java.util.Arrays; import java.util.List; /** * A QueryMaker that makes queries devised manually (by Grant Ingersoll) for * searching in the Reuters collection. */ public class ReutersQueryMaker extends AbstractQueryMaker implements QueryMaker { private static String [] STANDARD_QUERIES = { //Start with some short queries "Salomon", "Comex", "night trading", "Japan Sony", //Try some Phrase Queries "\"Sony Japan\"", "\"food needs\"~3", "\"World Bank\"^2 AND Nigeria", "\"World Bank\" -Nigeria", "\"Ford Credit\"~5", //Try some longer queries "airline Europe Canada destination", "Long term pressure by trade " + "ministers is necessary if the current Uruguay round of talks on " + "the General Agreement on Trade and Tariffs (GATT) is to " + "succeed" }; private static Query[] getPrebuiltQueries(String field) { // be wary of unanalyzed text return new Query[] { new SpanFirstQuery(new SpanTermQuery(new Term(field, "ford")), 5), new SpanNearQuery(new SpanQuery[]{new SpanTermQuery(new Term(field, "night")), new SpanTermQuery(new Term(field, "trading"))}, 4, false), new SpanNearQuery(new SpanQuery[]{new SpanFirstQuery(new SpanTermQuery(new Term(field, "ford")), 10), new SpanTermQuery(new Term(field, "credit"))}, 10, false), new WildcardQuery(new Term(field, "fo*")), }; } /** * Parse the strings containing Lucene queries. * * @param qs array of strings containing query expressions * @param a analyzer to use when parsing queries * @return array of Lucene queries */ private static Query[] createQueries(List<Object> qs, Analyzer a) { QueryParser qp = new QueryParser(Version.LUCENE_CURRENT, DocMaker.BODY_FIELD, a); List<Object> queries = new ArrayList |
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