/* * 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.io.Serializable; import java.lang.reflect.Constructor; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.List; import org.w3c.dom.Element; import org.jbpm.JbpmException; import org.jbpm.util.ArrayUtil; import org.jbpm.util.ClassLoaderUtil; import org.jbpm.util.XmlUtil; public class ConstructorInfo implements Serializable { private static final long serialVersionUID = 1L; private String className; private String factoryRefName; private String factoryClassName; private String factoryMethodName; private final String[] parameterClassNames; private final ObjectInfo[] parameterInfos; public ConstructorInfo(Element constructorElement, ObjectFactoryParser configParser) { // factory if (constructorElement.hasAttribute("factory")) { factoryRefName = constructorElement.getAttribute("factory"); if (!constructorElement.hasAttribute("method")) { throw new JbpmException("missing method attribute in constructor"); } factoryMethodName = constructorElement.getAttribute("method"); } // factory-class else if (constructorElement.hasAttribute("factory-class")) { factoryClassName = constructorElement.getAttribute("factory-class"); if (!constructorElement.hasAttribute("method")) { throw new JbpmException("missing method attribute in constructor"); } factoryMethodName = constructorElement.getAttribute("method"); } else { if (constructorElement.hasAttribute("method")) { throw new JbpmException("missing factory or factory-class attribute in constructor"); } // class if (constructorElement.hasAttribute("class")) { className = constructorElement.getAttribute("class"); } else { throw new JbpmException("missing class, factory or factory-class attribute in constructor"); } } // parameterTypesNames and parameterInfos List parameterElements = XmlUtil.elements(constructorElement, "parameter"); parameterClassNames = new String[parameterElements.size()]; parameterInfos = new ObjectInfo[parameterElements.size()]; for (int i = 0; i < parameterElements.size(); i++) { Element parameterElement = (Element) parameterElements.get(i); if (!parameterElement.hasAttribute("class")) { throw new JbpmException("missing class attribute in constructor parameter"); } parameterClassNames[i] = parameterElement.getAttribute("class"); Element parameterInfoElement = XmlUtil.element(parameterElement); if (parameterInfoElement == null) { throw new JbpmException("missing subelement in constructor parameter"); } parameterInfos[i] = configParser.parse(parameterInfoElement); } } public Object createObject(ObjectFactoryImpl objectFactory) { Object[] args = getArgs(objectFactory); Class[] parameterTypes = getParameterTypes(objectFactory); if (factoryRefName != null || factoryClassName != null) { Object factory; Class factoryClass; if (factoryRefName != null) { factory = objectFactory.getObject(factoryRefName); factoryClass = factory.getClass(); } else { factory = null; try { factoryClass = ClassLoaderUtil.classForName(factoryClassName); } catch (ClassNotFoundException e) { throw new JbpmException("factory class not found: " + factoryClassName, e); } } Method factoryMethod = findMethod(factoryClass, parameterTypes); try { return factoryMethod.invoke(factory, args); } catch (IllegalAccessException e) { throw new JbpmException(getClass() + " has no access to " + factoryMethod, e); } catch (InvocationTargetException e) { throw new JbpmException(factoryMethod + " threw exception", e.getCause()); } } else { try { Class clazz = objectFactory.classForName(className); Constructor constructor = clazz.getDeclaredConstructor(parameterTypes); try { return constructor.newInstance(args); } catch (InstantiationException e) { throw new JbpmException("failed to instantiate " + clazz, e); } catch (IllegalAccessException e) { throw new JbpmException(getClass() + " has no access to " + constructor, e); } catch (InvocationTargetException e) { throw new JbpmException(constructor + " threw exception", e.getCause()); } } catch (ClassNotFoundException e) { throw new JbpmException("class not found: " + className, e); } catch (NoSuchMethodException e) { throw new JbpmException("constructor not found: " + className + ArrayUtil.toString(parameterTypes), e); } } } protected Class[] getParameterTypes(ObjectFactoryImpl objectFactory) { int nbrOfParameters = parameterClassNames != null ? parameterClassNames.length : 0; Class[] parameterTypes = new Class[nbrOfParameters]; for (int i = 0; i < nbrOfParameters; i++) { String parameterClassName = parameterClassNames[i]; try { parameterTypes[i] = objectFactory.classForName(parameterClassName); } catch (ClassNotFoundException e) { throw new JbpmException("class not found: " + parameterClassName, e); } } return parameterTypes; } protected Object[] getArgs(ObjectFactoryImpl objectFactory) { int nbrOfParameters = (parameterClassNames != null ? parameterClassNames.length : 0); Object[] args = new Object[nbrOfParameters]; for (int i = 0; i < nbrOfParameters; i++) { args[i] = objectFactory.getObject(parameterInfos[i]); } return args; } public Method findMethod(Class clazz, Class[] parameterTypes) { try { // look for public method return clazz.getMethod(factoryMethodName, parameterTypes); } catch (NoSuchMethodException e) { // look for any method up the class hierarchy do { try { return clazz.getDeclaredMethod(factoryMethodName, parameterTypes); } catch (NoSuchMethodException e2) { clazz = clazz.getSuperclass(); } } while (clazz != null); // give up throw new JbpmException("no such method: " + factoryMethodName, e); } } }