/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.compiler.dag;
import java.util.Collections;
import java.util.List;
import eu.stratosphere.api.common.operators.base.DeltaIterationBase.SolutionSetPlaceHolder;
import eu.stratosphere.compiler.DataStatistics;
import eu.stratosphere.compiler.dataproperties.GlobalProperties;
import eu.stratosphere.compiler.dataproperties.LocalProperties;
import eu.stratosphere.compiler.plan.Channel;
import eu.stratosphere.compiler.plan.PlanNode;
import eu.stratosphere.compiler.plan.SolutionSetPlanNode;
/**
* The optimizer's internal representation of the solution set of a workset iteration.
*/
public class SolutionSetNode extends AbstractPartialSolutionNode {
private final WorksetIterationNode iterationNode;
public SolutionSetNode(SolutionSetPlaceHolder<?> psph, WorksetIterationNode iterationNode) {
super(psph);
this.iterationNode = iterationNode;
}
// --------------------------------------------------------------------------------------------
public void setCandidateProperties(GlobalProperties gProps, LocalProperties lProps, Channel initialInput) {
if (this.cachedPlans != null) {
throw new IllegalStateException();
} else {
this.cachedPlans = Collections.<PlanNode>singletonList(new SolutionSetPlanNode(this, "SolutionSet("+this.getPactContract().getName()+")", gProps, lProps, initialInput));
}
}
public SolutionSetPlanNode getCurrentSolutionSetPlanNode() {
if (this.cachedPlans != null) {
return (SolutionSetPlanNode) this.cachedPlans.get(0);
} else {
throw new IllegalStateException();
}
}
public WorksetIterationNode getIterationNode() {
return this.iterationNode;
}
@Override
public void computeOutputEstimates(DataStatistics statistics) {
copyEstimates(this.iterationNode.getInitialSolutionSetPredecessorNode());
}
// --------------------------------------------------------------------------------------------
/**
* Gets the contract object for this data source node.
*
* @return The contract.
*/
@Override
public SolutionSetPlaceHolder<?> getPactContract() {
return (SolutionSetPlaceHolder<?>) super.getPactContract();
}
@Override
public String getName() {
return "Solution Set";
}
@Override
public void computeUnclosedBranchStack() {
if (this.openBranches != null) {
return;
}
PactConnection solutionSetInput = this.iterationNode.getFirstIncomingConnection();
OptimizerNode solutionSetSource = solutionSetInput.getSource();
addClosedBranches(solutionSetSource.closedBranchingNodes);
List<UnclosedBranchDescriptor> fromInput = solutionSetSource.getBranchesForParent(solutionSetInput);
this.openBranches = (fromInput == null || fromInput.isEmpty()) ? Collections.<UnclosedBranchDescriptor>emptyList() : fromInput;
}
}