package org.drools.jpdl.instance.node;
import org.drools.jpdl.core.node.Decision;
import org.drools.workflow.instance.NodeInstance;
import org.jbpm.JbpmException;
import org.jbpm.graph.node.DecisionCondition;
import org.jbpm.graph.node.DecisionHandler;
import org.jbpm.instantiation.Delegation;
import org.jbpm.jpdl.el.impl.JbpmExpressionEvaluator;
public class DecisionInstance extends JpdlNodeInstance {
private static final long serialVersionUID = 1L;
public Decision getDecision() {
return (Decision) getNode();
}
public void execute(NodeInstance from, String type) {
String transitionName = null;
try {
Delegation decisionDelegation = getDecision().getDecisionDelegation();
if (decisionDelegation != null) {
DecisionHandler decisionHandler = (DecisionHandler) decisionDelegation.instantiate();
transitionName = decisionHandler.decide(new JpdlExecutionContext());
} else if (getDecision().getDecisionExpression() != null) {
String decisionExpression = getDecision().getDecisionExpression();
Object result = JbpmExpressionEvaluator.evaluate(
decisionExpression, new JpdlExecutionContext());
if (result == null) {
throw new JbpmException("decision expression '" +
decisionExpression + "' returned null");
}
transitionName = result.toString();
} else if (getDecision().getDecisionConditions() != null) {
for (DecisionCondition decisionCondition: getDecision().getDecisionConditions()) {
Object result = JbpmExpressionEvaluator.evaluate(
decisionCondition.getExpression(), new JpdlExecutionContext());
if (Boolean.TRUE.equals(result)) {
transitionName = decisionCondition.getTransitionName();
break;
}
}
} else {
// TODO
/*Iterator iter = leavingTransitions.iterator();
while (iter.hasNext() && (transition==null)) {
Transition candidate = (Transition) iter.next();
String conditionExpression = candidate.getCondition();
if (conditionExpression!=null) {
Object result = JbpmExpressionEvaluator.evaluate(conditionExpression, executionContext);
if (Boolean.TRUE.equals(result)) {
transition = candidate;
}
}
}*/
}
if (transitionName == null) {
leave();
} else {
leave(transitionName);
}
} catch (Exception exception) {
raiseException(exception);
}
}
}