/*
* 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.pvm.internal.wire.binding;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import org.jbpm.pvm.internal.util.XmlUtil;
import org.jbpm.pvm.internal.wire.Descriptor;
import org.jbpm.pvm.internal.wire.descriptor.ArgDescriptor;
import org.jbpm.pvm.internal.wire.descriptor.ObjectDescriptor;
import org.jbpm.pvm.internal.wire.operation.Operation;
import org.jbpm.pvm.internal.wire.xml.WireParser;
import org.jbpm.pvm.internal.xml.Bindings;
import org.jbpm.pvm.internal.xml.Parse;
import org.jbpm.pvm.internal.xml.Parser;
import org.w3c.dom.Element;
/** parses a descriptor for creating a java object through reflection.
*
* See schema docs for more details.
*
* @author Tom Baeyens
* @author Guillaume Porcher (documentation)
*/
public class ObjectBinding extends WireDescriptorBinding {
public static final String TAG = "object";
public ObjectBinding() {
super(TAG);
}
public static boolean isObjectDescriptor(Element element) {
if (XmlUtil.attribute(element, "class")!=null) {
return true;
}
if (XmlUtil.attribute(element, "factory")!=null) {
return true;
}
if (XmlUtil.element(element, "factory")!=null) {
return true;
}
return false;
}
public Object parse(Element element, Parse parse, Parser parser) {
ObjectDescriptor descriptor = new ObjectDescriptor();
Parser wireParser = (Parser) parser;
String className = XmlUtil.attribute(element, "class");
String expr = XmlUtil.attribute(element, "expr");
String factoryObjectName = XmlUtil.attribute(element, "factory");
Element factoryElement = XmlUtil.element(element, "factory");
if (className!=null) {
descriptor.setClassName(className);
if (factoryObjectName!=null) {
parse.addProblem("attribute 'factory' is specified together with attribute 'class' in element 'object': "+XmlUtil.toString(element), element);
}
if (factoryElement!=null) {
parse.addProblem("element 'factory' is specified together with attribute 'class' in element 'object': "+XmlUtil.toString(element), element);
}
Element constructorElement = XmlUtil.element(element, "constructor");
if (constructorElement!=null) {
List<Element> argElements = XmlUtil.elements(constructorElement, "arg");
List<ArgDescriptor> argDescriptors = wireParser.parseArgs(argElements, parse);
descriptor.setArgDescriptors(argDescriptors);
if (element.hasAttribute("method")) {
parse.addProblem("attributes 'class' and 'method' indicate static method and also a 'constructor' element is specified for element 'object': "+XmlUtil.toString(element), element);
}
}
} else if (factoryObjectName!=null) {
descriptor.setFactoryObjectName(factoryObjectName);
if (factoryElement!=null) {
parse.addProblem("element 'factory' is specified together with attribute 'factory' in element 'object': "+XmlUtil.toString(element), element);
}
} else if (factoryElement!=null) {
Element factoryDescriptorElement = XmlUtil.element(factoryElement);
Descriptor factoryDescriptor = (Descriptor) parser.parseElement(factoryDescriptorElement, parse, WireParser.CATEGORY_DESCRIPTOR);
descriptor.setFactoryDescriptor(factoryDescriptor);
} else if (expr!=null) {
descriptor.setExpr(expr);
String lang = XmlUtil.attribute(element, "lang");
descriptor.setLang(lang);
} else {
parse.addProblem("element 'object' must have one of {attribute 'class', attribute 'expr', attribute 'factory' or element 'factory'}: "+XmlUtil.toString(element), element);
}
// method
if (element.hasAttribute("method")) {
descriptor.setMethodName(element.getAttribute("method"));
List<Element> argElements = XmlUtil.elements(element, "arg");
List<ArgDescriptor> argDescriptors = wireParser.parseArgs(argElements, parse);
descriptor.setArgDescriptors(argDescriptors);
} else if ( (factoryObjectName!=null)
|| (factoryElement!=null)
) {
parse.addProblem("element 'object' with a element 'factory' or a attribute 'factory' must have a attribute 'method': "+XmlUtil.toString(element), element);
}
if( (className == null)
&& (XmlUtil.element(element, "constructor") != null)
) {
parse.addProblem("element 'object' with a 'constructor' element must have 'class' attribute: "+XmlUtil.toString(element), element);
}
// read the operations elements
List<Operation> operations = null;
List<Element> elements = XmlUtil.elements(element);
Set<String> operationTagNames = null;
Bindings bindings = parser.getBindings();
if (bindings!=null) {
operationTagNames = bindings.getTagNames(WireParser.CATEGORY_OPERATION);
} else {
operationTagNames = Collections.EMPTY_SET;
}
for (Element childElement: elements) {
if (operationTagNames.contains(childElement.getTagName())) {
Operation operation = (Operation) parser.parseElement(childElement, parse, WireParser.CATEGORY_OPERATION);
if (operations==null) {
operations = new ArrayList<Operation>();
}
operations.add(operation);
}
}
descriptor.setOperations(operations);
// autowiring
Boolean isAutoWireEnabled = XmlUtil.attributeBoolean(element, "auto-wire", false, parse);
if (isAutoWireEnabled!=null) {
descriptor.setAutoWireEnabled(isAutoWireEnabled.booleanValue());
}
return descriptor;
}
}