/*
* 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;
import java.util.Iterator;
import org.drools.lang.descr.BaseDescr;
import org.drools.lang.descr.ForallDescr;
import org.drools.lang.descr.PatternDescr;
import org.drools.rule.Forall;
import org.drools.rule.Pattern;
import org.drools.rule.RuleConditionElement;
public class ForallBuilder
implements
RuleConditionBuilder {
public RuleConditionElement build(final RuleBuildContext context,
final BaseDescr descr) {
return build( context,
descr,
null );
}
public RuleConditionElement build(final RuleBuildContext context,
final BaseDescr descr,
final Pattern prefixPattern) {
final ForallDescr forallDescr = (ForallDescr) descr;
final PatternBuilder patternBuilder = (PatternBuilder) context.getDialect().getBuilder( PatternDescr.class );
final Pattern basePattern = (Pattern) patternBuilder.build( context,
forallDescr.getBasePattern() );
if ( basePattern == null ) {
return null;
}
final Forall forall = new Forall( basePattern );
// adding the newly created forall CE to the build stack
// this is necessary in case of local declaration usage
context.getBuildStack().push( forall );
for ( final Iterator it = forallDescr.getRemainingPatterns().iterator(); it.hasNext(); ) {
final Pattern anotherPattern = (Pattern) patternBuilder.build( context,
(PatternDescr) it.next() );
forall.addRemainingPattern( anotherPattern );
}
// poping the forall
context.getBuildStack().pop();
return forall;
}
}