| /* |
| * 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.java.mapping; |
| |
| import org.apache.wayang.basic.data.Tuple2; |
| import org.apache.wayang.basic.operators.ZipWithIdOperator; |
| import org.apache.wayang.core.function.ExecutionContext; |
| import org.apache.wayang.core.function.FunctionDescriptor; |
| import org.apache.wayang.core.function.TransformationDescriptor; |
| import org.apache.wayang.core.mapping.Mapping; |
| import org.apache.wayang.core.mapping.OperatorPattern; |
| import org.apache.wayang.core.mapping.PlanTransformation; |
| import org.apache.wayang.core.mapping.ReplacementSubplanFactory; |
| import org.apache.wayang.core.mapping.SubplanPattern; |
| import org.apache.wayang.core.types.DataSetType; |
| import org.apache.wayang.java.operators.JavaMapOperator; |
| import org.apache.wayang.java.platform.JavaPlatform; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| |
| /** |
| * Mapping from {@link ZipWithIdMapping} to a subplan. |
| */ |
| @SuppressWarnings("unchecked") |
| public class ZipWithIdMapping implements Mapping { |
| |
| @Override |
| public Collection<PlanTransformation> getTransformations() { |
| return Collections.singleton(new PlanTransformation( |
| this.createSubplanPattern(), |
| this.createReplacementSubplanFactory(), |
| JavaPlatform.getInstance() |
| )); |
| } |
| |
| private SubplanPattern createSubplanPattern() { |
| final OperatorPattern operatorPattern = new OperatorPattern( |
| "zipwithid", new ZipWithIdOperator<>(DataSetType.none()), false); |
| return SubplanPattern.createSingleton(operatorPattern); |
| } |
| |
| private ReplacementSubplanFactory createReplacementSubplanFactory() { |
| return new ReplacementSubplanFactory.OfSingleOperators<ZipWithIdOperator<Object>>( |
| (matchedOperator, epoch) -> { |
| final DataSetType<Object> inputType = matchedOperator.getInputType(); |
| final DataSetType<Tuple2<Long, Object>> outputType = matchedOperator.getOutputType(); |
| return new JavaMapOperator<>( |
| inputType, |
| outputType, |
| new TransformationDescriptor<>( |
| new FunctionDescriptor.ExtendedSerializableFunction<Object, Tuple2<Long, Object>>() { |
| |
| private long nextId; |
| |
| @Override |
| public void open(ExecutionContext ctx) { |
| this.nextId = 0L; |
| } |
| |
| @Override |
| public Tuple2<Long, Object> apply(Object o) { |
| return new Tuple2<>(this.nextId++, o); |
| } |
| }, |
| inputType.getDataUnitType().toBasicDataUnitType(), |
| outputType.getDataUnitType().toBasicDataUnitType() |
| ) |
| ).at(epoch); |
| } |
| ); |
| } |
| } |