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.io.Serializable;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.drools.base.ClassTypeResolver;
import org.drools.base.TypeResolver;
import org.drools.base.mvel.DroolsMVELFactory;
import org.drools.ruleflow.core.ActionNode;
import org.drools.ruleflow.core.impl.DroolsConsequenceAction;
import org.drools.ruleflow.instance.RuleFlowNodeInstance;
import org.mvel.ExpressionCompiler;
import org.mvel.MVEL;
import org.mvel.ParserContext;
/**
* Runtime counterpart of an action node.
*
* @author <a href="mailto:kris_verlaenen@hotmail.com">Kris Verlaenen</a>
*/
public class ActionNodeInstanceImpl extends RuleFlowNodeInstanceImpl {
protected ActionNode getActionNode() {
return (ActionNode) getNode();
}
public void trigger(final RuleFlowNodeInstance from) {
Object action = getActionNode().getAction();
if (action instanceof DroolsConsequenceAction) {
String actionString = ((DroolsConsequenceAction) action).getConsequence();
ExpressionCompiler compiler = new ExpressionCompiler(actionString);
ParserContext parserContext = new ParserContext();
// imports
List imports = getProcessInstance().getRuleFlowProcess().getImports();
Set importSet = new HashSet();
if (imports != null) {
importSet.addAll(imports);
for (Iterator iterator = imports.iterator(); iterator.hasNext(); ) {
String importClassName = (String) iterator.next();
if ( importClassName.endsWith( ".*" ) ) {
importClassName = importClassName.substring(0, importClassName.indexOf(".*"));
parserContext.addPackageImport(importClassName);
} else {
try {
parserContext.addImport(Class.forName(importClassName));
} catch (ClassNotFoundException e) {
// class not found, do nothing
}
}
}
}
TypeResolver typeResolver = new ClassTypeResolver(importSet, Thread.currentThread().getContextClassLoader());
// compile expression
Serializable expression = compiler.compile(parserContext);
// globals
Map globalDefs = getProcessInstance().getRuleFlowProcess().getGlobals();
Map globals = new HashMap();
if (globalDefs != null) {
for (Iterator iterator = globalDefs.entrySet().iterator(); iterator.hasNext(); ) {
Map.Entry entry = (Map.Entry) iterator.next();
try {
globals.put(entry.getKey(), typeResolver.resolveType((String) entry.getValue()));
} catch (ClassNotFoundException exc) {
throw new IllegalArgumentException("Could not find type " + entry.getValue() + " of global " + entry.getKey());
}
}
}
// execute
DroolsMVELFactory factory = new DroolsMVELFactory(Collections.EMPTY_MAP, null, globals);
factory.setContext(null, null, null, getProcessInstance().getWorkingMemory(), null);
MVEL.executeExpression(expression, null, factory);
} else {
throw new RuntimeException("Unknown action: " + action);
}
triggerCompleted();
}
public void triggerCompleted() {
getProcessInstance().getNodeInstance( getActionNode().getTo().getTo() ).trigger( this );
getProcessInstance().removeNodeInstance(this);
}
}