org.drools.core.reteoo.builder.ReactiveFromBuilder Maven / Gradle / Ivy
/*
* Copyright 2015 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*
* 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.common.BetaConstraints;
import org.drools.core.reteoo.ReactiveFromNode;
import org.drools.core.rule.From;
import org.drools.core.rule.RuleConditionElement;
import org.drools.core.rule.constraint.XpathConstraint;
import org.drools.core.spi.AlphaNodeFieldConstraint;
import java.util.List;
public class ReactiveFromBuilder implements ReteooComponentBuilder {
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, context.getBetaconstraints(), true );
AlphaNodeFieldConstraint[] alphaNodeFieldConstraints = context.getAlphaConstraints() != null ?
context.getAlphaConstraints().toArray( new AlphaNodeFieldConstraint[context.getAlphaConstraints().size()] ) :
new AlphaNodeFieldConstraint[0];
ReactiveFromNode node = context.getComponentFactory().getNodeFactoryService()
.buildReactiveFromNode(context.getNextId(),
from.getDataProvider(),
context.getTupleSource(),
alphaNodeFieldConstraints,
betaConstraints,
context.isTupleMemoryEnabled(),
context,
from);
context.setTupleSource( utils.attachNode( context, node ) );
context.setAlphaConstraints(null);
context.setBetaconstraints( null );
context.incrementCurrentPatternOffset();
int patternOffset = context.getCurrentPatternOffset();
List xpathConstraints = context.getXpathConstraints();
for (XpathConstraint xpathConstraint : xpathConstraints) {
for ( XpathConstraint.XpathChunk chunk : xpathConstraint.getChunks() ) {
context.setAlphaConstraints( chunk.getAlphaConstraints() );
context.setBetaconstraints( chunk.getBetaConstraints() );
context.setXpathConstraints( chunk.getXpathConstraints() );
build( context, utils, chunk.asFrom() );
}
}
context.setCurrentPatternOffset( patternOffset );
}
public boolean requiresLeftActivation(final BuildUtils utils,
final RuleConditionElement rce) {
return true;
}
}