--- /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