Package org.drools.reteoo.builder

Source Code of org.drools.reteoo.builder.FromBuilder

/*
* 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.reteoo.ReteooComponentFactory;
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.kie.reteoo.builder.ReteooComponentBuilder#build(org.kie.reteoo.builder.BuildContext, org.kie.reteoo.builder.BuildUtils, org.kie.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,
                context.getComponentFactory().getNodeFactoryService().buildFromNode( context.getNextId(),
                                                                                     from.getDataProvider(),
                                                                                     context.getTupleSource(),
                                                                                     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;
    }

}
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