while using Lucene I implemented 2 new methods which i found useful (while implementing advanced search (find anything, find all)). If u would like to use it here is a source file.
Lp, Andraz
package org.apache.lucene.queryParser; /* ==================================================================== * The Apache Software License, Version 1.1 * * Copyright (c) 2001 The Apache Software Foundation. All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, * if any, must include the following acknowledgment: * "This product includes software developed by the * Apache Software Foundation (http://www.apache.org/)." * Alternately, this acknowledgment may appear in the software itself, * if and wherever such third-party acknowledgments normally appear. * * 4. The names "Apache" and "Apache Software Foundation" * must not be used to endorse or promote products * derived from this software without prior written permission. For * written permission, please contact [EMAIL PROTECTED] * * 5. Products derived from this software may not be called "Apache", * nor may "Apache" appear in their name, without * prior written permission of the Apache Software Foundation. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. */
import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.queryParser.CharStream; import org.apache.lucene.queryParser.ParseException; import org.apache.lucene.queryParser.QueryParser; import org.apache.lucene.queryParser.QueryParserTokenManager; import org.apache.lucene.search.BooleanQuery; import org.apache.lucene.search.Query; /** * A QueryParser which constructs queries to search multiple fields. * * @author <a href="mailto:[EMAIL PROTECTED]">Kelvin Tan</a> * @version $Revision: 1.3 $ */ public class MultiFieldQueryParser extends QueryParser { public static final int NORMAL_FIELD = 0; public static final int REQUIRED_FIELD = 1; public static final int PROHIBITED_FIELD = 2; public MultiFieldQueryParser(QueryParserTokenManager tm) { super(tm); } public MultiFieldQueryParser(CharStream stream) { super(stream); } public MultiFieldQueryParser(String f, Analyzer a) { super(f, a); } /** * <p> * Parses a query which searches on the fields specified. * <p> * If x fields are specified, this effectively constructs: * <pre> * <code> * (field1:query) (field2:query) (field3:query)...(fieldx:query) * </code> * </pre> * * @param query Query string to parse * @param fields Fields to search on * @param analyzer Analyzer to use * @throws ParseException if query parsing fails * @throws TokenMgrError if query parsing fails */ public static Query parse(String query, String[] fields, Analyzer analyzer) throws ParseException { BooleanQuery bQuery = new BooleanQuery(); for (int i = 0; i < fields.length; i++) { Query q = parse(query, fields[i], analyzer); bQuery.add(q, false, false); } return bQuery; } /** * <p> * Parses a query which searches on the fields specified. * <p> * If x fields are specified, this effectively constructs: * <pre> * <code> * (field1:query1) (field2:query2) (field3:query3)...(fieldx:queryx) * </code> * </pre> * @param queries Queries strings to parse * @param fields Fields to search on * @param analyzer Analyzer to use * @throws ParseException if query parsing fails * @throws TokenMgrError if query parsing fails */ public static Query parse(String[] queries, String[] fields, Analyzer analyzer) throws ParseException { if (queries.length != fields.length) throw new ParseException("queries.length != fields.length"); // TODO Exception handling BooleanQuery bQuery = new BooleanQuery(); for (int i = 0; i < fields.length; i++) { Query q = parse(queries[i], fields[i], analyzer); bQuery.add(q, false, false); } return bQuery; } /** * <p> * Parses a query, searching on the fields specified. * Use this if you need to specify certain fields as required, * and others as prohibited. * <p><pre> * Usage: * <code> * String[] fields = {"filename", "contents", "description"}; * int[] flags = {MultiFieldQueryParser.NORMAL FIELD, * MultiFieldQueryParser.REQUIRED FIELD, * MultiFieldQueryParser.PROHIBITED FIELD,}; * parse(query, fields, flags, analyzer); * </code> * </pre> *<p> * The code above would construct a query: * <pre> * <code> * (filename:query1) +(contents:query2) -(description:query3) * </code> * </pre> * * @param query Query string to parse * @param fields Fields to search on * @param flags Flags describing the fields * @param analyzer Analyzer to use * @throws ParseException if query parsing fails * @throws TokenMgrError if query parsing fails */ public static Query parse(String query, String[] fields, int[] flags, Analyzer analyzer) throws ParseException { BooleanQuery bQuery = new BooleanQuery(); for (int i = 0; i < fields.length; i++) { Query q = parse(query, fields[i], analyzer); int flag = flags[i]; switch (flag) { case REQUIRED_FIELD: bQuery.add(q, true, false); break; case PROHIBITED_FIELD: bQuery.add(q, false, true); break; default: bQuery.add(q, false, false); break; } } return bQuery; } /** * <p> * Parses a query, searching on the fields specified. * Use this if you need to specify certain fields as required, * and others as prohibited. * <p><pre> * Usage: * <code> * String[] fields = {"filename", "contents", "description"}; * int[] flags = {MultiFieldQueryParser.NORMAL FIELD, * MultiFieldQueryParser.REQUIRED FIELD, * MultiFieldQueryParser.PROHIBITED FIELD,}; * parse(query, fields, flags, analyzer); * </code> * </pre> *<p> * The code above would construct a query: * <pre> * <code> * (filename:query1) +(contents:query2) -(description:query3) * </code> * </pre> * * @param queries Queries string to parse * @param fields Fields to search on * @param flags Flags describing the fields * @param analyzer Analyzer to use * @throws ParseException if query parsing fails * @throws TokenMgrError if query parsing fails */ public static Query parse(String[] queries, String[] fields, int[] flags, Analyzer analyzer) throws ParseException { if (queries.length != fields.length) throw new ParseException("queries.length != fields.length"); // TODO Exception handling BooleanQuery bQuery = new BooleanQuery(); for (int i = 0; i < fields.length; i++) { Query q = parse(queries[i], fields[i], analyzer); int flag = flags[i]; switch (flag) { case REQUIRED_FIELD: bQuery.add(q, true, false); break; case PROHIBITED_FIELD: bQuery.add(q, false, true); break; default: bQuery.add(q, false, false); break; } } return bQuery; } }
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