/*
* 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.wire.binding;
import org.jbpm.wire.Descriptor;
import org.jbpm.wire.descriptor.ObjectDescriptor;
import org.jbpm.wire.operation.FieldOperation;
import org.jbpm.wire.xml.WireParser;
import org.jbpm.xml.Binding;
import org.jbpm.xml.Parse;
import org.jbpm.xml.Parser;
import org.jbpm.xml.XmlUtil;
import org.w3c.dom.Element;
/**
* <p>This {@link Binding} specifies a {@link FieldOperation} (for field injection).</p>
*
* <p>A field injection is defined by a <b><code>{@literal <field>}</code></b> xml element.</p>
*
* <p>This element has a attribute "name", which specifies the name of the field to inject.</p>
* <p>This element should contain a child element that defines a {@link Descriptor}.
* This descriptor will be used to create the object that will be assigned to the field</p>
*
* <h3>Example</h3>
*
* Consider the following class:
* <pre> public class Foo {
* String bar;
* }</pre>
*
* The following Xml declaration will create an object 'o' of class 'Foo' (see {@link ObjectDescriptor}), and
* the value <code>hello</code> will be assigned to <code>o.bar</code>.
*
* <pre> <objects>
* <object name='o' class='Foo'>
* <field name='bar'>
* <string value='hello' />
* </field>
* </object>
* </objects></pre>
*
* @author Tom Baeyens
* @author Guillaume Porcher (documentation)
*
* @see ObjectBinding
* @see WireParser
*/
public class FieldBinding implements Binding {
public Object parse(Element element, Parse parse, Parser parser) {
FieldOperation fieldOperation = new FieldOperation();
if (element.hasAttribute("name")) {
fieldOperation.setFieldName(element.getAttribute("name"));
} else {
parse.addProblem("field must have name : "+XmlUtil.toString(element));
}
Element descriptorElement = XmlUtil.element(element);
if (descriptorElement!=null) {
Descriptor descriptor = (Descriptor) parser.parseElement(descriptorElement, parse, WireParser.CATEGORY_DESCRIPTOR);
if (descriptor!=null) {
fieldOperation.setDescriptor(descriptor);
} else {
parse.addProblem("unknown descriptor element "+descriptorElement.getTagName()+" inside field operation: "+XmlUtil.toString(element));
}
} else {
parse.addProblem("field must have 1 descriptor element out of "+parser.getBindings().getTagNames(WireParser.CATEGORY_DESCRIPTOR)+" as content: "+XmlUtil.toString(element));
}
return fieldOperation;
}
}