/*
* 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.reteoo.builder;
import java.util.List;
import org.drools.common.BetaConstraints;
import org.drools.reteoo.FromNode;
import org.drools.reteoo.LeftTupleSource;
import org.drools.rule.From;
import org.drools.rule.RuleConditionElement;
import org.drools.spi.AlphaNodeFieldConstraint;
import org.drools.spi.BetaNodeFieldConstraint;
public class FromBuilder
implements
ReteooComponentBuilder {
/* (non-Javadoc)
* @see org.drools.reteoo.builder.ReteooComponentBuilder#build(org.drools.reteoo.builder.BuildContext, org.drools.reteoo.builder.BuildUtils, org.drools.rule.RuleConditionElement)
*/
public void build(final BuildContext context,
final BuildUtils utils,
final RuleConditionElement rce) {
final From from = (From) rce;
context.pushRuleComponent( from );
@SuppressWarnings("unchecked")
BetaConstraints betaConstraints = utils.createBetaNodeConstraint( context, (List<BetaNodeFieldConstraint>) context.getBetaconstraints(), true );
context.setTupleSource( (LeftTupleSource) utils.attachNode( context,
new FromNode( context.getNextId(),
from.getDataProvider(),
context.getTupleSource(),
(AlphaNodeFieldConstraint[]) context.getAlphaConstraints().toArray( new AlphaNodeFieldConstraint[context.getAlphaConstraints().size()] ),
betaConstraints,
context.isTupleMemoryEnabled(),
context,
from ) ) );
context.setAlphaConstraints( null );
context.setBetaconstraints( null );
context.popRuleComponent();
}
/**
* @inheritDoc
*/
public boolean requiresLeftActivation(final BuildUtils utils,
final RuleConditionElement rce) {
return true;
}
}