开源搜索系统 Red-Piranha.7z

package com.redpiranha.server.input.search; /* * Copyright (C) 2001- 2004 Paul Browne, http://www.firstpartners.net, * * released under terms of the GPL license * http://www.opensource.org/licenses/gpl-license.php * * This product includes software developed by the * Apache Software Foundation (http://www.apache.org)." * */ import org.apache.log4j.Logger; import java.io.Serializable; import java.util.Date; import com.redpiranha.common.*; /** * Builds Search Queries * * @author BROWNEPA * @version $Revision: 1.12 $ */ public class SearchQueryBuilder implements Serializable { /** * Special Characters , as used by Lucene */ private static final String LUCENE_SPECIAL_CHARACTERS = ":\"?*~[]^+-()\\&"; /** * The logger. */ private static final Logger log = Logger.getLogger(SearchQueryBuilder.class); /** * Handle to instance of self */ private static SearchQueryBuilder thisBuilder = new SearchQueryBuilder(); /** * Constructor - private - use get instance */ private SearchQueryBuilder() { } /** * Get a (Single) instance of this SearchQueryBuilder * * @return SearchQueryBuilder */ public static SearchQueryBuilder getInstance() { return thisBuilder; } /** * Generate a Search Query * * @param inQueryString * * @return SearchQuery */ public SearchQuery buildQuery(String inQueryString) { log.debug("buildQuery(" + inQueryString + ")"); //null -empty query check if ((inQueryString == null)||(inQueryString.equals(""))) { return new SearchQuery(""); } //Convert to lower case inQueryString = inQueryString.toLowerCase(); if (containsLuceneCharacters(inQueryString)) { return buildPassThroughQuery(inQueryString); } //Default to pass through return buildDefaultQuery(inQueryString); } /** * Advanced Search Builder * @param fromDate * @param toDate * @param searchField1 * @param searchField2 * @param searchField3 * @param searchText1 * @param searchText2 * @param searchText3 * @param andOr2 * @param andOr3 * @param wordsPhrase1 * @param wordsPhrase2 * @param wordsPhrase3 * @return SearchQuery - build from these phrases */ public SearchQuery buildQuery(Date fromDate, Date toDate, String searchField1, String searchField2, String searchField3, String searchText1, String searchText2, String searchText3, String andOr2, String andOr3, String wordsPhrase1, String wordsPhrase2, String wordsPhrase3) { //Local Variables StringBuffer queryContents = new StringBuffer(); //Change nulls to empty strings if (searchText1==null){searchText1="";} if (searchText2==null){searchText2="";} if (searchText3==null){searchText3="";} //Check that we have some text to search against if ((searchText1.equals(""))&&(searchText2.equals(""))&&(searchText2.equals(""))){ log.debug("building empty search query"); return new SearchQuery(""); } //Convert terms to lower case searchText1=searchText1.toLowerCase(); searchText2=searchText2.toLowerCase(); searchText3=searchText3.toLowerCase(); //Build the Search Query in two parts - 1 the text , word-phrase , should , and or etc queryContents.append(generateTxtWrdAndOrBodyTitle(null ,searchField1,wordsPhrase1,searchText1)); queryContents.append(generateTxtWrdAndOrBodyTitle(andOr2,searchField2,wordsPhrase2,searchText2)); queryContents.append(generateTxtWrdAndOrBodyTitle(andOr3,searchField3,wordsPhrase3,searchText3)); //Append the Date Search Information - if needed if((fromDate!=null)&&(toDate!=null)){ queryContents.append(generateDateSection(fromDate,toDate)); } return new SearchQuery(queryContents.toString()); } /** * Generate the Date section of the query * @param fromDate * @param toDate * @return String representing the dates requested , in lucene format */ private String generateDateSection(Date fromDate , Date toDate){ //local variables StringBuffer returnValue = new StringBuffer(); returnValue.append(" AND ("+/**SearchConstants.DOCUMENT_DATE**/""); returnValue.append(":["); returnValue.append(fromDate.getTime()); returnValue.append(" TO "); returnValue.append(toDate.getTime()); returnValue.append("])"); return returnValue.toString(); } /** * Build a query , using the defaults fields , wildcards etc * * @param inQueryString criteria * * @return Simpel Search Query */ private SearchQuery buildDefaultQuery(String inQueryString) { log.debug("buildDefaultQuery(" + inQueryString + ")"); //Local Variables StringBuffer queryContents = new StringBuffer(); /* queryContents.append(SearchConstants.DOCUMENT_CONTENTS + ":" + inQueryString + "*"); queryContents.append(" OR "); queryContents.append(SearchConstants.DOCUMENT_NAME + ":" + inQueryString + "*"); queryContents.append(" OR "); queryContents.append(SearchConstants.DB_ID + ":" + inQueryString + "*"); queryContents.append(" OR "); queryContents.append(SearchConstants.DOCUMENT_FILE_NAME + ":" + inQueryString + "*"); queryContents.append(" OR "); queryContents.append(SearchConstants.DOCUMENT_DATE + ":" + inQueryString + "*"); queryContents.append(" OR "); queryContents.append(SearchConstants.DOCUMENT_OWNER + ":" + inQueryString + "*"); queryContents.append(" OR "); queryContents.append(SearchConstants.DOCUMENT_SOURCE + ":" + inQueryString + "*"); */ return new SearchQuery(queryContents.toString()); } /** * Build a pass through query - ie using as much of the original query String as possible * * @param inQueryString * * @return SearchQuery */ private SearchQuery buildPassThroughQuery(String inQueryString) { log.debug("buildPassThroughQuery(" + inQueryString + ")"); return new SearchQuery(inQueryString); } /** * Check to see if the querystring contains any lucene special characters * * @param inQueryString - to inspect * * @return boolean - true if special characters are present */ private boolean containsLuceneCharacters(String inQueryString) { String thisLetter; log.debug("containsLuceneCharacters(" + inQueryString + ")"); //Loop through special characters for (int a = 0; a < LUCENE_SPECIAL_CHARACTERS.length(); a++) { thisLetter = LUCENE_SPECIAL_CHARACTERS.substring(a, a + 1); if (inQueryString.indexOf(thisLetter) > -1) {