/*
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* JBoss, Home of Professional Open Source
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* Copyright 2005, JBoss Inc., and individual contributors as indicated
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* by the @authors tag. See the copyright.txt in the distribution for a
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* full listing of individual contributors.
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this software; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
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*/
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package org.jbpm.pvm.internal.wire.binding;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.Set;
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import org.jbpm.pvm.internal.util.XmlUtil;
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import org.jbpm.pvm.internal.wire.Descriptor;
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import org.jbpm.pvm.internal.wire.descriptor.ArgDescriptor;
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import org.jbpm.pvm.internal.wire.descriptor.ObjectDescriptor;
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import org.jbpm.pvm.internal.wire.operation.Operation;
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import org.jbpm.pvm.internal.wire.xml.WireParser;
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import org.jbpm.pvm.internal.xml.Bindings;
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import org.jbpm.pvm.internal.xml.Parse;
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import org.jbpm.pvm.internal.xml.Parser;
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import org.w3c.dom.Element;
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/** parses a descriptor for creating a java object through reflection.
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*
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* See schema docs for more details.
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*
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* @author Tom Baeyens
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* @author Guillaume Porcher (documentation)
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*/
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public class ObjectBinding extends WireDescriptorBinding {
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public static final String TAG = "object";
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public static final ObjectBinding INSTANCE = new ObjectBinding();
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public ObjectBinding() {
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super(TAG);
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}
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public static boolean isObjectDescriptor(Element element) {
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if (XmlUtil.attribute(element, "class")!=null) {
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return true;
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}
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if (XmlUtil.attribute(element, "factory")!=null) {
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return true;
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}
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if (XmlUtil.element(element, "factory")!=null) {
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return true;
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}
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return false;
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}
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public Object parse(Element element, Parse parse, Parser parser) {
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ObjectDescriptor descriptor = new ObjectDescriptor();
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Parser wireParser = (Parser) parser;
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String className = XmlUtil.attribute(element, "class");
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String expr = XmlUtil.attribute(element, "expr");
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String factoryObjectName = XmlUtil.attribute(element, "factory");
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Element factoryElement = XmlUtil.element(element, "factory");
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if (className!=null) {
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descriptor.setClassName(className);
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if (factoryObjectName!=null) {
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parse.addProblem("attribute 'factory' is specified together with attribute 'class' in element 'object': "+XmlUtil.toString(element), element);
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}
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if (factoryElement!=null) {
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parse.addProblem("element 'factory' is specified together with attribute 'class' in element 'object': "+XmlUtil.toString(element), element);
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}
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Element constructorElement = XmlUtil.element(element, "constructor");
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if (constructorElement!=null) {
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List<Element> argElements = XmlUtil.elements(constructorElement, "arg");
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List<ArgDescriptor> argDescriptors = wireParser.parseArgs(argElements, parse);
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descriptor.setArgDescriptors(argDescriptors);
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if (element.hasAttribute("method")) {
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parse.addProblem("attributes 'class' and 'method' indicate static method and also a 'constructor' element is specified for element 'object': "+XmlUtil.toString(element), element);
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}
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}
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} else if (factoryObjectName!=null) {
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descriptor.setFactoryObjectName(factoryObjectName);
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if (factoryElement!=null) {
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parse.addProblem("element 'factory' is specified together with attribute 'factory' in element 'object': "+XmlUtil.toString(element), element);
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}
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} else if (factoryElement!=null) {
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Element factoryDescriptorElement = XmlUtil.element(factoryElement);
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Descriptor factoryDescriptor = (Descriptor) parser.parseElement(factoryDescriptorElement, parse, WireParser.CATEGORY_DESCRIPTOR);
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descriptor.setFactoryDescriptor(factoryDescriptor);
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} else if (expr!=null) {
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descriptor.setExpr(expr);
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String lang = XmlUtil.attribute(element, "lang");
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descriptor.setLang(lang);
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} else {
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parse.addProblem("element 'object' must have one of {attribute 'class', attribute 'expr', attribute 'factory' or element 'factory'}: "+XmlUtil.toString(element), element);
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}
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// method
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if (element.hasAttribute("method")) {
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descriptor.setMethodName(element.getAttribute("method"));
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List<Element> argElements = XmlUtil.elements(element, "arg");
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List<ArgDescriptor> argDescriptors = wireParser.parseArgs(argElements, parse);
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descriptor.setArgDescriptors(argDescriptors);
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} else if ( (factoryObjectName!=null)
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|| (factoryElement!=null)
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) {
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parse.addProblem("element 'object' with a element 'factory' or a attribute 'factory' must have a attribute 'method': "+XmlUtil.toString(element), element);
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}
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if( (className == null)
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&& (XmlUtil.element(element, "constructor") != null)
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) {
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parse.addProblem("element 'object' with a 'constructor' element must have 'class' attribute: "+XmlUtil.toString(element), element);
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}
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// read the operations elements
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List<Operation> operations = null;
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List<Element> elements = XmlUtil.elements(element);
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Set<String> operationTagNames = null;
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Bindings bindings = parser.getBindings();
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if (bindings!=null) {
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operationTagNames = bindings.getTagNames(WireParser.CATEGORY_OPERATION);
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} else {
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operationTagNames = Collections.EMPTY_SET;
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}
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for (Element childElement: elements) {
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if (operationTagNames.contains(childElement.getTagName())) {
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Operation operation = (Operation) parser.parseElement(childElement, parse, WireParser.CATEGORY_OPERATION);
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if (operations==null) {
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operations = new ArrayList<Operation>();
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}
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operations.add(operation);
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}
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}
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descriptor.setOperations(operations);
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// autowiring
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Boolean isAutoWireEnabled = XmlUtil.attributeBoolean(element, "auto-wire", false, parse);
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if (isAutoWireEnabled!=null) {
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descriptor.setAutoWireEnabled(isAutoWireEnabled.booleanValue());
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}
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return descriptor;
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}
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}
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