/*
* Copyright 2006 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.rule.builder.dialect.mvel;
import java.util.List;
import java.util.Map;
import org.drools.base.mvel.MVELCompilationUnit;
import org.drools.base.mvel.MVELReturnValueExpression;
import org.drools.compiler.DescrBuildError;
import org.drools.compiler.Dialect;
import org.drools.lang.descr.ReturnValueRestrictionDescr;
import org.drools.rule.Declaration;
import org.drools.rule.MVELDialectRuntimeData;
import org.drools.rule.ReturnValueRestriction;
import org.drools.rule.builder.ReturnValueBuilder;
import org.drools.rule.builder.RuleBuildContext;
/**
* @author etirelli
*
*/
public class MVELReturnValueBuilder
implements
ReturnValueBuilder {
public void build(final RuleBuildContext context,
final List[] usedIdentifiers,
final Declaration[] previousDeclarations,
final Declaration[] localDeclarations,
final ReturnValueRestriction returnValueRestriction,
final ReturnValueRestrictionDescr returnValueRestrictionDescr) {
try {
MVELDialect dialect = (MVELDialect) context.getDialect( context.getDialect().getId() );
Dialect.AnalysisResult analysis = context.getDialect().analyzeExpression( context,
returnValueRestrictionDescr,
returnValueRestrictionDescr.getContent(),
new Map[]{context.getDeclarationResolver().getDeclarationClasses(context.getRule()), context.getPackageBuilder().getGlobals()} );
MVELCompilationUnit unit = dialect.getMVELCompilationUnit((String) returnValueRestrictionDescr.getContent(), analysis, previousDeclarations, localDeclarations, null, context);
MVELReturnValueExpression expr = new MVELReturnValueExpression( unit,
context.getDialect().getId() );
returnValueRestriction.setReturnValueExpression( expr );
MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( context.getDialect().getId() );
data.addCompileable( returnValueRestriction,
expr );
expr.compile( context.getPackageBuilder().getRootClassLoader() );
} catch ( final Exception e ) {
context.getErrors().add( new DescrBuildError( context.getParentDescr(),
context.getRuleDescr(),
null,
"Unable to build expression for 'returnValue' : " + e.getMessage() + "'" + context.getRuleDescr().getSalience() + "'" ) );
}
}
}