Package org.jbpm.bpmn2.xml

Source Code of org.jbpm.bpmn2.xml.DataObjectHandler

/**
* 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.jbpm.bpmn2.xml;

import java.util.HashSet;
import java.util.List;
import java.util.Map;

import org.drools.process.core.datatype.DataType;
import org.drools.process.core.datatype.impl.type.ObjectDataType;
import org.drools.xml.BaseAbstractHandler;
import org.drools.xml.ExtensibleXmlParser;
import org.drools.xml.Handler;
import org.jbpm.bpmn2.core.ItemDefinition;
import org.jbpm.bpmn2.core.SequenceFlow;
import org.jbpm.compiler.xml.ProcessBuildData;
import org.jbpm.process.core.ContextContainer;
import org.jbpm.process.core.context.variable.Variable;
import org.jbpm.process.core.context.variable.VariableScope;
import org.jbpm.workflow.core.Node;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

public class DataObjectHandler extends BaseAbstractHandler implements Handler {

  public DataObjectHandler() {
        initValidParents();
        initValidPeers();
        this.allowNesting = false;
    }
   
    protected void initValidParents() {
        this.validParents = new HashSet<Class<?>>();
        this.validParents.add(ContextContainer.class);
    }
   
    protected void initValidPeers() {
        this.validPeers = new HashSet<Class<?>>();
        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 itemSubjectRef = attrs.getValue("itemSubjectRef");

    Object parent = parser.getParent();
    if (parent instanceof ContextContainer) {
        ContextContainer contextContainer = (ContextContainer) parent;
        VariableScope variableScope = (VariableScope)
                contextContainer.getDefaultContext(VariableScope.VARIABLE_SCOPE);
      List variables = variableScope.getVariables();
      Variable variable = new Variable();
      variable.setMetaData("DataObject", "true");
      variable.setName(id);
      // retrieve type from item definition
      DataType dataType = new ObjectDataType();
      Map<String, ItemDefinition> itemDefinitions = (Map<String, ItemDefinition>)
              ((ProcessBuildData) parser.getData()).getMetaData("ItemDefinitions");
          if (itemDefinitions != null) {
            ItemDefinition itemDefinition = itemDefinitions.get(itemSubjectRef);
            if (itemDefinition != null) {
              dataType = new ObjectDataType(itemDefinition.getStructureRef());
            }
          }
      variable.setType(dataType);
      variables.add(variable);
      return variable;
    }

    return new Variable();
  }

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

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

}
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