org.drools.bpmn2.xml.SequenceFlowHandler Maven / Gradle / Ivy

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/**
 * Copyright 2010 JBoss Inc
 *
 * 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.drools.bpmn2.xml;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;

import org.drools.bpmn2.core.SequenceFlow;
import org.drools.process.core.context.variable.Variable;
import org.drools.ruleflow.core.RuleFlowProcess;
import org.drools.workflow.core.Node;
import org.drools.workflow.core.NodeContainer;
import org.drools.workflow.core.node.CompositeNode;
import org.drools.xml.BaseAbstractHandler;
import org.drools.xml.ExtensibleXmlParser;
import org.drools.xml.Handler;
import org.w3c.dom.Element;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

public class SequenceFlowHandler extends BaseAbstractHandler implements Handler {

	public SequenceFlowHandler() {
        initValidParents();
        initValidPeers();
        this.allowNesting = false;
    }
    
    protected void initValidParents() {
        this.validParents = new HashSet>();
        this.validParents.add(NodeContainer.class);
    }
    
    protected void initValidPeers() {
        this.validPeers = new HashSet>();
        this.validPeers.add(null);
        this.validPeers.add(Variable.class);
        this.validPeers.add(Node.class);
        this.validPeers.add(SequenceFlow.class);
    }
    
	@SuppressWarnings("unchecked")
	public Object start(final String uri, final String localName,
			            final Attributes attrs, final ExtensibleXmlParser parser)
			throws SAXException {
		parser.startElementBuilder(localName, attrs);

		final String id = attrs.getValue("id");
		final String sourceRef = attrs.getValue("sourceRef");
		final String targetRef = attrs.getValue("targetRef");
		final String bendpoints = attrs.getValue("g:bendpoints");
		final String name = attrs.getValue("name");

		NodeContainer nodeContainer = (NodeContainer) parser.getParent();
		
		List connections = null;
		if (nodeContainer instanceof RuleFlowProcess) {
			connections = (List)
				((RuleFlowProcess) nodeContainer).getMetaData(ProcessHandler.CONNECTIONS);			
			if (connections == null) {
				connections = new ArrayList();
				((RuleFlowProcess) nodeContainer).setMetaData(ProcessHandler.CONNECTIONS, connections);
			}
		} else if (nodeContainer instanceof CompositeNode) {
			connections = (List)
				((CompositeNode) nodeContainer).getMetaData(ProcessHandler.CONNECTIONS);			
			if (connections == null) {
				connections = new ArrayList();
				((CompositeNode) nodeContainer).setMetaData(ProcessHandler.CONNECTIONS, connections);
			}
		}
		SequenceFlow connection = new SequenceFlow(id, sourceRef, targetRef);
		connection.setBendpoints(bendpoints);
		connection.setName(name);
		
		connections.add(connection);

		return connection;
	}

	public Object end(final String uri, final String localName,
			          final ExtensibleXmlParser parser) throws SAXException {
		final Element element = parser.endElementBuilder();
		SequenceFlow sequenceFlow = (SequenceFlow) parser.getCurrent();
        
		org.w3c.dom.Node xmlNode = element.getFirstChild();
        while (xmlNode != null) {
        	String nodeName = xmlNode.getNodeName();
        	if ("conditionExpression".equals(nodeName)) {
        		String expression = xmlNode.getTextContent();
        		org.w3c.dom.Node languageNode = xmlNode.getAttributes().getNamedItem("language");
        		if (languageNode != null) {
        			String language = languageNode.getNodeValue();
        			if (XmlBPMNProcessDumper.JAVA_LANGUAGE.equals(language)) {
        				sequenceFlow.setLanguage("java");
        			} else if (XmlBPMNProcessDumper.RULE_LANGUAGE.equals(language)) {
        				sequenceFlow.setType("rule");
        			} else if (XmlBPMNProcessDumper.XPATH_LANGUAGE.equals(language)) {
                        sequenceFlow.setLanguage("XPath");
                    } else {
        			    throw new IllegalArgumentException("Unknown language " + language);
        			}
        		}
        		sequenceFlow.setExpression(expression);
        	}
        	xmlNode = xmlNode.getNextSibling();
        }
        return sequenceFlow;
	}

	public Class generateNodeFor() {
		return SequenceFlow.class;
	}

}