| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.wayang.core.optimizer.cardinality; |
| |
| import org.apache.wayang.core.api.Configuration; |
| import org.apache.wayang.core.optimizer.OptimizationContext; |
| import org.apache.wayang.core.plan.wayangplan.InputSlot; |
| import org.apache.wayang.core.plan.wayangplan.LoopHeadAlternative; |
| import org.apache.wayang.core.plan.wayangplan.LoopHeadOperator; |
| import org.apache.wayang.core.plan.wayangplan.OperatorAlternative; |
| import org.apache.wayang.core.plan.wayangplan.OutputSlot; |
| import org.apache.wayang.core.plan.wayangplan.Slot; |
| import org.apache.wayang.core.util.Tuple; |
| |
| import java.util.Collection; |
| import java.util.function.BiFunction; |
| import java.util.stream.Collectors; |
| |
| /** |
| * {@link CardinalityPusher} implementation for {@link LoopHeadAlternative}s. |
| */ |
| public class LoopHeadAlternativeCardinalityPusher extends AbstractAlternativeCardinalityPusher { |
| |
| Collection<Tuple<OperatorAlternative.Alternative, CardinalityPusher>> alternativePushers; |
| |
| public LoopHeadAlternativeCardinalityPusher( |
| final LoopHeadAlternative loopHeadAlternative, |
| Collection<InputSlot<?>> relevantInputSlots, |
| Collection<OutputSlot<?>> relevantOutputSlots, |
| BiFunction<OperatorAlternative.Alternative, Configuration, CardinalityPusher> pusherRetriever, |
| final Configuration configuration |
| ) { |
| super(Slot.toIndices(relevantInputSlots), Slot.toIndices(relevantOutputSlots)); |
| this.alternativePushers = loopHeadAlternative.getAlternatives().stream() |
| .map(alternative -> { |
| final CardinalityPusher alternativePusher = pusherRetriever.apply(alternative, configuration); |
| return new Tuple<>(alternative, alternativePusher); |
| }) |
| .collect(Collectors.toList()); |
| } |
| |
| |
| @Override |
| public void pushThroughAlternatives(OptimizationContext.OperatorContext opCtx, Configuration configuration) { |
| final OptimizationContext optCtx = opCtx.getOptimizationContext(); |
| for (Tuple<OperatorAlternative.Alternative, CardinalityPusher> alternativePusher : this.alternativePushers) { |
| LoopHeadOperator loopHeadOperator = (LoopHeadOperator) alternativePusher.field0.getContainedOperator(); |
| final OptimizationContext.OperatorContext lhoCtx = optCtx.getOperatorContext(loopHeadOperator); |
| alternativePusher.field1.push(lhoCtx, configuration); |
| } |
| } |
| |
| } |