/*
* 2012-3 Red Hat Inc. and/or its affiliates and other contributors.
*
* 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.overlord.rtgov.activity.processor.mvel;
import org.mvel2.MVEL;
import org.overlord.rtgov.activity.model.ActivityType;
import org.overlord.rtgov.activity.processor.InformationTransformer;
/**
* This class represents a MVEL based information transformer.
*
*/
public class MVELInformationTransformer extends InformationTransformer {
private String _expression=null;
private Object _compiledExpression=null;
/**
* This method returns the expression.
*
* @return The expression
*/
public String getExpression() {
return (_expression);
}
/**
* This method sets the expression.
*
* @param expr The expression
*/
public void setExpression(String expr) {
_expression = expr;
}
/**
* {@inheritDoc}
*/
@Override
public void init() throws Exception {
super.init();
// Initialize the mvel script expression
_compiledExpression = MVEL.compileExpression(getExpression());
}
/**
* {@inheritDoc}
*/
public String transform(Object information, java.util.Map<String, Object> headers, ActivityType activityType) {
java.util.Map<String,Object> vars=new java.util.HashMap<String, Object>();
vars.put("information", information);
vars.put("headers", headers);
vars.put("activity", activityType);
Object result=MVEL.executeExpression(_compiledExpression, vars);
return (result == null ? null : result.toString());
}
}