Java tutorial
/* * JBoss, Home of Professional Open Source * Copyright 2005, JBoss Inc., and individual contributors as indicated * by the @authors tag. See the copyright.txt in the distribution for a * full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ package org.jbpm.configuration; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.jbpm.JbpmContext; import org.jbpm.svc.Services; import org.jbpm.util.XmlUtil; import org.w3c.dom.Element; public class JbpmContextInfo extends AbstractObjectInfo { private static final long serialVersionUID = 1L; Map serviceFactoryObjectInfos = null; Map serviceFactories = null; List serviceNames = null; ObjectInfo[] saveOperationObjectInfos = null; List saveOperations = null; public JbpmContextInfo(Element jbpmContextElement, ObjectFactoryParser objectFactoryParser) { super(verifyDefaultName(jbpmContextElement), objectFactoryParser); if (jbpmContextElement.hasAttribute("singleton")) { throw new ConfigurationException("attribute 'singleton' is not allowed in element 'jbpm-context'"); } // parse the services serviceFactoryObjectInfos = new HashMap(); List serviceElements = XmlUtil.elements(jbpmContextElement, "service"); serviceNames = new ArrayList(); Iterator iter = serviceElements.iterator(); while (iter.hasNext()) { Element serviceElement = (Element) iter.next(); if (!serviceElement.hasAttribute("name")) { throw new ConfigurationException( "name is required in service element " + XmlUtil.toString(serviceElement)); } String serviceName = serviceElement.getAttribute("name"); serviceNames.add(serviceName); ObjectInfo serviceFactoryObjectInfo = null; Element factoryElement = XmlUtil.element(serviceElement, "factory"); if (factoryElement != null) { Element factoryBeanElement = XmlUtil.element(factoryElement); if (factoryBeanElement == null) { throw new ConfigurationException("element 'factory' requires either a bean or ref element"); } serviceFactoryObjectInfo = objectFactoryParser.parse(factoryBeanElement); if (serviceElement.hasAttribute("factory")) { log.warn("duplicate factory specification for service " + serviceName + ", using the factory element"); } } else if (serviceElement.hasAttribute("factory")) { String factoryClassName = serviceElement.getAttribute("factory"); BeanInfo beanInfo = new BeanInfo(); beanInfo.setClassName(factoryClassName); serviceFactoryObjectInfo = beanInfo; } else { throw new ConfigurationException( "element 'service' requires either a factory attribute or a factory element"); } serviceFactoryObjectInfos.put(serviceName, serviceFactoryObjectInfo); } // parse the save operations Element saveOperationsElement = XmlUtil.element(jbpmContextElement, "save-operations"); if (saveOperationsElement != null) { List saveOperationElements = XmlUtil.elements(saveOperationsElement, "save-operation"); saveOperationObjectInfos = new ObjectInfo[saveOperationElements.size()]; for (int i = 0; i < saveOperationElements.size(); i++) { Element saveOperationElement = (Element) saveOperationElements.get(i); if (saveOperationElement.hasAttribute("class")) { String saveOperationClassName = saveOperationElement.getAttribute("class"); BeanInfo beanInfo = new BeanInfo(); beanInfo.setClassName(saveOperationClassName); saveOperationObjectInfos[i] = beanInfo; } else { Element saveOperationBeanElement = XmlUtil.element(saveOperationElement); if (saveOperationBeanElement == null) { throw new ConfigurationException( "element 'save-operation' requires either a class attribute or an element of type 'bean' or 'ref'"); } saveOperationObjectInfos[i] = objectFactoryParser.parse(saveOperationBeanElement); } } } } static Element verifyDefaultName(Element jbpmContextElement) { if (!jbpmContextElement.hasAttribute("name")) { jbpmContextElement.setAttribute("name", JbpmContext.DEFAULT_JBPM_CONTEXT_NAME); } return jbpmContextElement; } public synchronized Object createObject(ObjectFactoryImpl objectFactory) { if (serviceFactories == null) { serviceFactories = new HashMap(); Iterator iter = serviceFactoryObjectInfos.entrySet().iterator(); while (iter.hasNext()) { Map.Entry entry = (Map.Entry) iter.next(); String serviceName = (String) entry.getKey(); ObjectInfo serviceFactoryObjectInfo = (ObjectInfo) entry.getValue(); serviceFactories.put(serviceName, serviceFactoryObjectInfo.createObject(objectFactory)); } } if ((saveOperations == null) && (saveOperationObjectInfos != null)) { saveOperations = new ArrayList(); for (int i = 0; i < saveOperationObjectInfos.length; i++) { Object saveOperation = saveOperationObjectInfos[i].createObject(objectFactory); saveOperations.add(saveOperation); } } Services services = new Services(serviceFactories, serviceNames, saveOperations); if (log.isDebugEnabled()) log.debug("creating jbpm context with service factories '" + serviceFactories.keySet() + "'"); return new JbpmContext(services, objectFactory); } private static Log log = LogFactory.getLog(JbpmContextInfo.class); }