/*
* 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.core.reteoo.builder;
import org.drools.core.reteoo.LeftTupleSource;
import org.drools.core.rule.QueryElement;
import org.drools.core.rule.RuleConditionElement;
public class QueryElementBuilder
implements
ReteooComponentBuilder {
/**
* @inheritDoc
*/
public void build(final BuildContext context,
final BuildUtils utils,
final RuleConditionElement rce) {
final QueryElement qe = (QueryElement) rce;
context.pushRuleComponent( qe );
final int currentOffset = context.getCurrentPatternOffset();
qe.getResultPattern().setOffset( currentOffset );
utils.checkUnboundDeclarations( context,
qe.getRequiredDeclarations() );
context.setTupleSource( (LeftTupleSource) utils.attachNode( context,
context.getComponentFactory().getNodeFactoryService().buildQueryElementNode(
context.getNextId(),
context.getTupleSource(),
qe,
context.isTupleMemoryEnabled(),
qe.isOpenQuery(),
context ) ) );
context.popRuleComponent();
context.incrementCurrentPatternOffset();
}
/**
* @inheritDoc
*/
public boolean requiresLeftActivation(final BuildUtils utils,
final RuleConditionElement rce) {
return true;
}
}