/**
 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jbpm.bpmn2.xml;

import java.util.HashSet;

import org.drools.core.xml.BaseAbstractHandler;
import org.drools.core.xml.ExtensibleXmlParser;
import org.drools.core.xml.Handler;
import org.jbpm.bpmn2.core.Interface;
import org.jbpm.bpmn2.core.Interface.Operation;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

public class OperationHandler extends BaseAbstractHandler implements Handler {
	
	@SuppressWarnings("unchecked")
	public OperationHandler() {
		if ((this.validParents == null) && (this.validPeers == null)) {
			this.validParents = new HashSet();
			this.validParents.add(Interface.class);

			this.validPeers = new HashSet();
			this.validPeers.add(null);
			this.validPeers.add(Operation.class);

			this.allowNesting = false;
		}
	}

    public Object start(final String uri, final String localName,
			            final Attributes attrs, final ExtensibleXmlParser parser)
			throws SAXException {
		parser.startElementBuilder(localName, attrs);

		String id = attrs.getValue("id");
		String name = attrs.getValue("name");
		String implRef = attrs.getValue("implementationRef");
		
		Interface i = (Interface) parser.getParent();
        Operation operation = i.addOperation(id, name);
        if (implRef != null) {
            operation.setImplementationRef(implRef);
        }
		return operation;
	}

	public Object end(final String uri, final String localName,
			          final ExtensibleXmlParser parser) throws SAXException {
		parser.endElementBuilder();
		return parser.getCurrent();
	}

	public Class<?> generateNodeFor() {
		return Operation.class;
	}

}