+++ /dev/null
-package org.apache.lucene.xmlparser;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.Enumeration;
-import java.util.HashMap;
-import java.util.Properties;
-
-import javax.xml.parsers.DocumentBuilder;
-import javax.xml.parsers.DocumentBuilderFactory;
-import javax.xml.parsers.ParserConfigurationException;
-import javax.xml.transform.Result;
-import javax.xml.transform.Templates;
-import javax.xml.transform.Transformer;
-import javax.xml.transform.TransformerConfigurationException;
-import javax.xml.transform.TransformerException;
-import javax.xml.transform.TransformerFactory;
-import javax.xml.transform.dom.DOMResult;
-import javax.xml.transform.dom.DOMSource;
-import javax.xml.transform.stream.StreamResult;
-
-import org.w3c.dom.Document;
-import org.w3c.dom.Element;
-import org.xml.sax.SAXException;
-
-/**
- * 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.
- */
-/**
- * Provides utilities for turning query form input (such as from a web page or Swing gui) into
- * Lucene XML queries by using XSL templates. This approach offers a convenient way of externalizing
- * and changing how user input is turned into Lucene queries.
- * Database applications often adopt similar practices by externalizing SQL in template files that can
- * be easily changed/optimized by a DBA.
- * The static methods can be used on their own or by creating an instance of this class you can store and
- * re-use compiled stylesheets for fast use (e.g. in a server environment)
- */
-public class QueryTemplateManager
-{
- static DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance ();
- static TransformerFactory tFactory = TransformerFactory.newInstance();
-
- HashMap<String,Templates> compiledTemplatesCache=new HashMap<String,Templates>();
- Templates defaultCompiledTemplates=null;
-
-
- public QueryTemplateManager()
- {
-
- }
- public QueryTemplateManager(InputStream xslIs) throws TransformerConfigurationException, ParserConfigurationException, SAXException, IOException
- {
- addDefaultQueryTemplate(xslIs);
- }
- public void addDefaultQueryTemplate(InputStream xslIs) throws TransformerConfigurationException, ParserConfigurationException, SAXException, IOException
- {
- defaultCompiledTemplates=getTemplates(xslIs);
- }
- public void addQueryTemplate(String name, InputStream xslIs) throws TransformerConfigurationException, ParserConfigurationException, SAXException, IOException
- {
- compiledTemplatesCache.put(name,getTemplates(xslIs));
- }
- public String getQueryAsXmlString(Properties formProperties,String queryTemplateName) throws SAXException, IOException, ParserConfigurationException, TransformerException
- {
- Templates ts= compiledTemplatesCache.get(queryTemplateName);
- return getQueryAsXmlString(formProperties, ts);
- }
-
- public Document getQueryAsDOM(Properties formProperties,String queryTemplateName) throws SAXException, IOException, ParserConfigurationException, TransformerException
- {
- Templates ts= compiledTemplatesCache.get(queryTemplateName);
- return getQueryAsDOM(formProperties, ts);
- }
- public String getQueryAsXmlString(Properties formProperties) throws SAXException, IOException, ParserConfigurationException, TransformerException
- {
- return getQueryAsXmlString(formProperties, defaultCompiledTemplates);
- }
-
- public Document getQueryAsDOM(Properties formProperties) throws SAXException, IOException, ParserConfigurationException, TransformerException
- {
- return getQueryAsDOM(formProperties, defaultCompiledTemplates);
- }
-
-
- /**
- * Fast means of constructing query using a precompiled stylesheet
- */
- public static String getQueryAsXmlString(Properties formProperties, Templates template) throws SAXException, IOException, ParserConfigurationException, TransformerException
- {
- ByteArrayOutputStream baos=new ByteArrayOutputStream();
- StreamResult result=new StreamResult(baos);
- transformCriteria(formProperties,template,result);
- return baos.toString();
- }
-
- /**
- * Slow means of constructing query parsing a stylesheet from an input stream
- */
- public static String getQueryAsXmlString(Properties formProperties, InputStream xslIs) throws SAXException, IOException, ParserConfigurationException, TransformerException
- {
- ByteArrayOutputStream baos=new ByteArrayOutputStream();
- StreamResult result=new StreamResult(baos);
- transformCriteria(formProperties,xslIs,result);
- return baos.toString();
- }
-
-
- /**
- * Fast means of constructing query using a cached,precompiled stylesheet
- */
- public static Document getQueryAsDOM(Properties formProperties, Templates template) throws SAXException, IOException, ParserConfigurationException, TransformerException
- {
- DOMResult result=new DOMResult();
- transformCriteria(formProperties,template,result);
- return (Document)result.getNode();
- }
-
-
- /**
- * Slow means of constructing query - parses stylesheet from input stream
- */
- public static Document getQueryAsDOM(Properties formProperties, InputStream xslIs) throws SAXException, IOException, ParserConfigurationException, TransformerException
- {
- DOMResult result=new DOMResult();
- transformCriteria(formProperties,xslIs,result);
- return (Document)result.getNode();
- }
-
-
-
-
- /**
- * Slower transformation using an uncompiled stylesheet (suitable for development environment)
- */
- public static void transformCriteria(Properties formProperties, InputStream xslIs, Result result) throws SAXException, IOException, ParserConfigurationException, TransformerException
- {
- dbf.setNamespaceAware(true);
- DocumentBuilder builder = dbf.newDocumentBuilder();
- org.w3c.dom.Document xslDoc = builder.parse(xslIs);
- DOMSource ds = new DOMSource(xslDoc);
-
- Transformer transformer =null;
- synchronized (tFactory)
- {
- transformer = tFactory.newTransformer(ds);
- }
- transformCriteria(formProperties,transformer,result);
- }
-
- /**
- * Fast transformation using a pre-compiled stylesheet (suitable for production environments)
- */
- public static void transformCriteria(Properties formProperties, Templates template, Result result) throws SAXException, IOException, ParserConfigurationException, TransformerException
- {
- transformCriteria(formProperties,template.newTransformer(),result);
- }
-
-
-
- public static void transformCriteria(Properties formProperties, Transformer transformer, Result result) throws SAXException, IOException, ParserConfigurationException, TransformerException
- {
- dbf.setNamespaceAware(true);
-
- //Create an XML document representing the search index document.
- DocumentBuilder db = dbf.newDocumentBuilder ();
- org.w3c.dom.Document doc = db.newDocument ();
- Element root = doc.createElement ("Document");
- doc.appendChild (root);
-
- Enumeration keysEnum = formProperties.keys();
- while(keysEnum.hasMoreElements())
- {
- String propName=(String) keysEnum.nextElement();
- String value=formProperties.getProperty(propName);
- if((value!=null)&&(value.length()>0))
- {
- DOMUtils.insertChild(root,propName,value);
- }
- }
- //Use XSLT to to transform into an XML query string using the queryTemplate
- DOMSource xml=new DOMSource(doc);
- transformer.transform(xml,result);
- }
-
- /**
- * Parses a query stylesheet for repeated use
- */
- public static Templates getTemplates(InputStream xslIs) throws ParserConfigurationException, SAXException, IOException, TransformerConfigurationException
- {
- dbf.setNamespaceAware(true);
- DocumentBuilder builder = dbf.newDocumentBuilder();
- org.w3c.dom.Document xslDoc = builder.parse(xslIs);
- DOMSource ds = new DOMSource(xslDoc);
- return tFactory.newTemplates(ds);
- }
-}
fnp / pylucene.git / blobdiff