| /* |
| * 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.oodt.cas.workflow.instrepo; |
| |
| //OODT imports |
| import org.apache.oodt.commons.xml.DOMUtil; |
| |
| //JDK imports |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.List; |
| import java.util.Vector; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| import javax.xml.parsers.DocumentBuilder; |
| import javax.xml.parsers.DocumentBuilderFactory; |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Element; |
| import org.w3c.dom.NodeList; |
| import org.xml.sax.InputSource; |
| |
| /** |
| * @author mattmann |
| * @version $Revision$ |
| * |
| * <p> |
| * Describe your class here |
| * </p>. |
| */ |
| public final class WorkflowInstanceMetadataReader implements |
| WorkflowInstanceMetMapKeys { |
| |
| /* our log stream */ |
| private static Logger LOG = Logger |
| .getLogger(WorkflowInstanceMetadataReader.class.getName()); |
| |
| private WorkflowInstanceMetadataReader() throws InstantiationException { |
| throw new InstantiationException("Don't construct utility classes!"); |
| } |
| |
| public static WorkflowInstanceMetMap parseMetMapFile(String mapFilePath) |
| throws Exception { |
| Document doc = getDocumentRoot(mapFilePath); |
| Element rootElem = doc.getDocumentElement(); |
| WorkflowInstanceMetMap map = new WorkflowInstanceMetMap(); |
| |
| // make sure that there is a default tag |
| Element defaultElem = DOMUtil.getFirstElement(rootElem, |
| DEFAULT_WORKFLOW_MAP); |
| |
| if (defaultElem == null) { |
| throw new Exception("file: [" + mapFilePath |
| + "] must specify a default workflow to field map!"); |
| } |
| |
| map.addDefaultFields(readFields(defaultElem)); |
| |
| NodeList workflowMapNodes = rootElem |
| .getElementsByTagName(WORKFLOW_TAG_NAME); |
| |
| if (workflowMapNodes != null && workflowMapNodes.getLength() > 0) { |
| for (int i = 0; i < workflowMapNodes.getLength(); i++) { |
| Element workflowMapElem = (Element) workflowMapNodes.item(i); |
| String workflowId = workflowMapElem |
| .getAttribute(WORKFLOW_TAG_ID_ATTR); |
| List workflowFields = readFields(workflowMapElem); |
| map.addWorkflowToMap(workflowId, workflowFields); |
| } |
| } |
| |
| return map; |
| |
| } |
| |
| private static List readFields(Element rootFldElem) { |
| NodeList defaultFldNodes = rootFldElem.getElementsByTagName(FIELD_TAG); |
| List fields = null; |
| |
| if (defaultFldNodes != null && defaultFldNodes.getLength() > 0) { |
| fields = new Vector(defaultFldNodes.getLength()); |
| for (int i = 0; i < defaultFldNodes.getLength(); i++) { |
| Element defaultFldElem = (Element) defaultFldNodes.item(i); |
| fields.add(defaultFldElem.getAttribute(FIELD_TAG_NAME_ATTR)); |
| } |
| } |
| |
| return fields; |
| } |
| |
| private static Document getDocumentRoot(String xmlFile) { |
| // open up the XML file |
| DocumentBuilderFactory factory = null; |
| DocumentBuilder parser = null; |
| Document document = null; |
| InputSource inputSource = null; |
| |
| InputStream xmlInputStream = null; |
| |
| try { |
| xmlInputStream = new File(xmlFile).toURL().openStream(); |
| } catch (IOException e) { |
| LOG.log(Level.WARNING, |
| "IOException when getting input stream from [" + xmlFile |
| + "]: returning null document root"); |
| return null; |
| } |
| |
| inputSource = new InputSource(xmlInputStream); |
| |
| try { |
| factory = DocumentBuilderFactory.newInstance(); |
| parser = factory.newDocumentBuilder(); |
| document = parser.parse(inputSource); |
| } catch (Exception e) { |
| LOG.warning("Unable to parse xml file [" + xmlFile + "]." |
| + "Reason is [" + e + "]"); |
| return null; |
| } |
| |
| return document; |
| } |
| |
| } |