+++ /dev/null
-/**
- * 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.
- */
-
-package org.apache.lucene.xmlparser.webdemo;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.util.Enumeration;
-import java.util.Properties;
-import java.util.StringTokenizer;
-
-import javax.servlet.RequestDispatcher;
-import javax.servlet.ServletConfig;
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-
-import org.apache.lucene.analysis.Analyzer;
-import org.apache.lucene.analysis.standard.StandardAnalyzer;
-import org.apache.lucene.document.Document;
-import org.apache.lucene.document.Field;
-import org.apache.lucene.index.CorruptIndexException;
-import org.apache.lucene.index.IndexWriter;
-import org.apache.lucene.search.IndexSearcher;
-import org.apache.lucene.search.Query;
-import org.apache.lucene.search.ScoreDoc;
-import org.apache.lucene.search.TopDocs;
-import org.apache.lucene.store.RAMDirectory;
-import org.apache.lucene.xmlparser.CorePlusExtensionsParser;
-import org.apache.lucene.xmlparser.QueryTemplateManager;
-
-public class FormBasedXmlQueryDemo extends HttpServlet {
-
- private QueryTemplateManager queryTemplateManager;
- private CorePlusExtensionsParser xmlParser;
- private IndexSearcher searcher;
- private Analyzer analyzer=new StandardAnalyzer(org.apache.lucene.util.Version.LUCENE_CURRENT);
-
- @Override
- public void init(ServletConfig config) throws ServletException {
- super.init(config);
- try {
- openExampleIndex();
-
- //load servlet configuration settings
- String xslFile=config.getInitParameter("xslFile");
- String defaultStandardQueryParserField = config.getInitParameter("defaultStandardQueryParserField");
-
-
- //Load and cache choice of XSL query template using QueryTemplateManager
- queryTemplateManager=new QueryTemplateManager(
- getServletContext().getResourceAsStream("/WEB-INF/"+xslFile));
-
- //initialize an XML Query Parser for use by all threads
- xmlParser=new CorePlusExtensionsParser(defaultStandardQueryParserField,analyzer);
- } catch (Exception e) {
- throw new ServletException("Error loading query template",e);
- }
- }
-
- @Override
- protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
- //Take all completed form fields and add to a Properties object
- Properties completedFormFields=new Properties();
- Enumeration pNames = request.getParameterNames();
- while(pNames.hasMoreElements()){
- String propName=(String) pNames.nextElement();
- String value=request.getParameter(propName);
- if((value!=null)&&(value.trim().length()>0)){
- completedFormFields.setProperty(propName, value);
- }
- }
-
- try{
-
- //Create an XML query by populating template with given user criteria
- org.w3c.dom.Document xmlQuery=queryTemplateManager.getQueryAsDOM(completedFormFields);
-
- //Parse the XML to produce a Lucene query
- Query query=xmlParser.getQuery(xmlQuery.getDocumentElement());
-
- //Run the query
- TopDocs topDocs = searcher.search(query,10);
-
- //and package the results and forward to JSP
- if(topDocs!=null) {
- ScoreDoc[] sd = topDocs.scoreDocs;
- Document[] results=new Document[sd.length];
- for (int i = 0; i < results.length; i++) {
- results[i]=searcher.doc(sd[i].doc);
- request.setAttribute("results", results);
- }
- }
- RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/index.jsp");
- dispatcher.forward(request,response);
- }
- catch(Exception e){
- throw new ServletException("Error processing query",e);
- }
- }
-
- private void openExampleIndex() throws CorruptIndexException, IOException {
-
- //Create a RAM-based index from our test data file
- RAMDirectory rd=new RAMDirectory();
- IndexWriter writer=new IndexWriter (rd,analyzer,IndexWriter.MaxFieldLength.LIMITED);
- InputStream dataIn=getServletContext().getResourceAsStream("/WEB-INF/data.tsv");
- BufferedReader br = new BufferedReader(new InputStreamReader(dataIn));
- String line = br.readLine();
- while(line!=null)
- {
- line=line.trim();
- if(line.length()>0)
- {
- //parse row and create a document
- StringTokenizer st=new StringTokenizer(line,"\t");
- Document doc=new Document();
- doc.add(new Field("location",st.nextToken(),Field.Store.YES,
- Field.Index.ANALYZED_NO_NORMS));
- doc.add(new Field("salary",st.nextToken(),Field.Store.YES,
- Field.Index.ANALYZED_NO_NORMS));
- doc.add(new Field("type",st.nextToken(),Field.Store.YES,
- Field.Index.ANALYZED_NO_NORMS));
- doc.add(new Field("description",st.nextToken(),Field.Store.YES,
- Field.Index.ANALYZED));
- writer.addDocument(doc);
- }
- line=br.readLine();
- }
- writer.close();
-
- //open searcher
- searcher=new IndexSearcher(rd, true);
- }
-}
fnp / pylucene.git / blobdiff