/*
* 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.lang;
import java.util.HashMap;
import java.util.Map;
import org.drools.lang.descr.PackageDescr;
import org.drools.rule.builder.DroolsCompilerComponentFactory;
import org.mvel2.integration.impl.MapVariableResolverFactory;
import org.mvel2.optimizers.OptimizerFactory;
import org.mvel2.templates.SimpleTemplateRegistry;
import org.mvel2.templates.TemplateCompiler;
import org.mvel2.templates.TemplateRegistry;
import org.mvel2.templates.TemplateRuntime;
import org.mvel2.templates.res.Node;
/**
* Dumps a PackageDescr into a DRL String
*/
public class DrlDumper {
protected final TemplateRegistry REPORT_REGISTRY = new SimpleTemplateRegistry();
protected ExpressionRewriter mvel = new MVELDumper();
public DrlDumper() {
OptimizerFactory.setDefaultOptimizer( "reflective" );
REPORT_REGISTRY.addNamedTemplate( "drl",
TemplateCompiler.compileTemplate( DrlDumper.class.getResourceAsStream( "drl.mvel" ),
(Map<String, Class< ? extends Node>>) null ) );
/**
* Process these templates
*/
TemplateRuntime.execute( REPORT_REGISTRY.getNamedTemplate( "drl" ),
null,
REPORT_REGISTRY );
}
public String dump( final PackageDescr pkg ) {
Map<String, Object> context = new HashMap<String, Object>();
context.put( "pkg",
pkg );
context.put( "mvel",
mvel );
return (String) TemplateRuntime.execute( REPORT_REGISTRY.getNamedTemplate( "drl" ),
null,
new MapVariableResolverFactory( context ),
REPORT_REGISTRY );
}
}