/*
* 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.drools.runtime.pipeline.impl;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import org.drools.runtime.pipeline.Expression;
import org.drools.runtime.pipeline.PipelineContext;
import org.drools.runtime.pipeline.Receiver;
import org.mvel2.MVEL;
import org.mvel2.ParserContext;
import org.mvel2.compiler.ExpressionCompiler;
public class MvelExpression extends BaseEmitter
implements
Expression,
Receiver {
private Serializable expr;
public MvelExpression(String text) {
final ParserContext parserContext = new ParserContext();
parserContext.setStrictTypeEnforcement( false );
ExpressionCompiler compiler = new ExpressionCompiler( text );
this.expr = compiler.compile( parserContext );
}
public void receive(Object object,
PipelineContext context) {
Object result = null;
try {
Map<String, Object> vars = new HashMap<String, Object>(1);
vars.put( "context", context );
result = MVEL.executeExpression( this.expr,
object,
vars );
} catch ( Exception e ) {
handleException( this,
object,
e );
}
emit( result,
context );
}
}