package org.drools.ruleflow.instance.impl;
/*
* Copyright 2005 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.
*/
import java.util.Iterator;
import java.util.List;
import org.drools.common.RuleFlowGroupNode;
import org.drools.ruleflow.core.Connection;
import org.drools.ruleflow.core.Constraint;
import org.drools.ruleflow.core.Split;
import org.drools.ruleflow.instance.RuleFlowNodeInstance;
import org.drools.spi.Activation;
import org.drools.spi.RuleFlowGroup;
/**
* Runtime counterpart of a split node.
*
* @author <a href="mailto:kris_verlaenen@hotmail.com">Kris Verlaenen</a>
*/
public class RuleFlowSplitInstanceImpl extends RuleFlowNodeInstanceImpl
implements
RuleFlowNodeInstance {
protected Split getSplitNode() {
return (Split) getNode();
}
public void trigger(final RuleFlowNodeInstance from) {
final Split split = getSplitNode();
switch ( split.getType() ) {
case Split.TYPE_AND :
List outgoing = split.getOutgoingConnections();
for ( final Iterator iterator = outgoing.iterator(); iterator.hasNext(); ) {
final Connection connection = (Connection) iterator.next();
getProcessInstance().getNodeInstance( connection.getTo() ).trigger( this );
}
break;
case Split.TYPE_XOR :
outgoing = split.getOutgoingConnections();
int priority = Integer.MAX_VALUE;
Connection selected = null;
RuleFlowGroup systemRuleFlowGroup = getProcessInstance().getAgenda().getRuleFlowGroup("DROOLS_SYSTEM");
for ( final Iterator iterator = outgoing.iterator(); iterator.hasNext(); ) {
final Connection connection = (Connection) iterator.next();
Constraint constraint = split.getConstraint(connection);
if (constraint != null && constraint.getPriority() < priority) {
String rule = "RuleFlow-Split-" + getProcessInstance().getProcess().getId() + "-" +
getNode().getId() + "-" + connection.getTo().getId();
for (Iterator activations = systemRuleFlowGroup.iterator(); activations.hasNext(); ) {
Activation activation = ((RuleFlowGroupNode) activations.next()).getActivation();
if (rule.equals(activation.getRule().getName())) {
selected = connection;
priority = constraint.getPriority();
break;
}
}
}
}
if (selected == null) {
throw new IllegalArgumentException("XOR split could not find at least one valid outgoing connection for split " + getSplitNode().getName());
}
getProcessInstance().getNodeInstance( selected.getTo() ).trigger( this );
break;
case Split.TYPE_OR :
outgoing = split.getOutgoingConnections();
boolean found = false;
systemRuleFlowGroup = getProcessInstance().getAgenda().getRuleFlowGroup("DROOLS_SYSTEM");
for ( final Iterator iterator = outgoing.iterator(); iterator.hasNext(); ) {
final Connection connection = (Connection) iterator.next();
Constraint constraint = split.getConstraint(connection);
if (constraint != null) {
String rule = "RuleFlow-Split-" + getProcessInstance().getProcess().getId() + "-" +
getNode().getId() + "-" + connection.getTo().getId();
for (Iterator activations = systemRuleFlowGroup.iterator(); activations.hasNext(); ) {
Activation activation = ((RuleFlowGroupNode) activations.next()).getActivation();
if (rule.equals(activation.getRule().getName())) {
getProcessInstance().getNodeInstance( connection.getTo() ).trigger( this );
found = true;
break;
}
}
}
if (!found) {
throw new IllegalArgumentException("OR split could not find at least one valid outgoing connection for split " + getSplitNode().getName());
}
}
break;
default :
throw new IllegalArgumentException( "Illegal split type " + split.getType() );
}
}
}