001/**
002 * Copyright 2005-2015 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.kuali.rice.edl.impl;
017
018import org.kuali.rice.core.api.util.RiceUtilities;
019import org.w3c.dom.Document;
020import org.w3c.dom.Element;
021import org.w3c.dom.NodeList;
022
023import javax.xml.parsers.DocumentBuilderFactory;
024import javax.xml.xpath.XPath;
025import javax.xml.xpath.XPathConstants;
026import javax.xml.xpath.XPathFactory;
027import java.io.InputStream;
028import java.util.LinkedHashMap;
029import java.util.Map;
030
031/**
032 * Builds a EDLGlobalConfig.
033 *
034 * @author Kuali Rice Team (rice.collab@kuali.org)
035 */
036public class EDLGlobalConfigFactory {
037
038        private static final String CONFIG_PROCESSOR_XPATH_XPRSN = "xpathExp";
039        private static final String CONFIG_PROCESSOR_CLASS_NAME = "className";
040
041
042        public static EDLGlobalConfig createEDLGlobalConfig(String edlConfigLocation) throws Exception {
043                EDLGlobalConfig edlConfig = new EDLGlobalConfig();
044                InputStream configStream = RiceUtilities.getResourceAsStream(edlConfigLocation);
045                Document configXml = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(configStream);
046
047                edlConfig.setPreProcessors(createProcessorMap("//preProcessors/preProcessor", configXml));
048                edlConfig.setPostProcessors(createProcessorMap("//postProcessors/postProcessor", configXml));
049                edlConfig.setStateComponents(createProcessorMap("//stateComponents/stateComponent", configXml));
050                edlConfig.setConfigProcessors(createConfigProcessorMap("//configProcessors/configProcessor", configXml));
051
052                return edlConfig;
053        }
054
055        private static Map createProcessorMap(String xpathExpression, Document doc) throws Exception {
056                Map processors = new LinkedHashMap();//preserve parsing order
057                XPath xpath = XPathFactory.newInstance().newXPath();
058                NodeList globalProcessorDeclarations = (NodeList)xpath.evaluate(xpathExpression, doc, XPathConstants.NODESET);
059                for (int i = 0; i < globalProcessorDeclarations.getLength(); i++) {
060                        Element globalProcessorDeclaraion = (Element)globalProcessorDeclarations.item(i);
061                        processors.put(globalProcessorDeclaraion, Class.forName(globalProcessorDeclaraion.getFirstChild().getNodeValue()));
062                }
063                return processors;
064        }
065
066        private static Map createConfigProcessorMap(String xpathExpression, Document doc) throws Exception {
067                Map configProcessors = new LinkedHashMap();//preserve parsing order
068                XPath xpath = XPathFactory.newInstance().newXPath();
069                NodeList globalConfigProcessorDeclarations = (NodeList)xpath.evaluate(xpathExpression, doc, XPathConstants.NODESET);
070                for (int i = 0; i < globalConfigProcessorDeclarations.getLength(); i++) {
071                        Element globalProcessorDeclaraion = (Element)globalConfigProcessorDeclarations.item(i);
072                        String xpathEx = (String)xpath.evaluate(CONFIG_PROCESSOR_XPATH_XPRSN, globalProcessorDeclaraion, XPathConstants.STRING);
073                        String className = (String)xpath.evaluate(CONFIG_PROCESSOR_CLASS_NAME, globalProcessorDeclaraion, XPathConstants.STRING);
074                        configProcessors.put(xpathEx, Class.forName(className));
075                }
076                return configProcessors;
077        }
078}