| /* |
| * 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.beam.runners.core.construction; |
| |
| import com.google.common.collect.Iterables; |
| import java.util.Map; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.runners.AppliedPTransform; |
| import org.apache.beam.sdk.runners.PTransformOverrideFactory; |
| import org.apache.beam.sdk.transforms.Create; |
| import org.apache.beam.sdk.transforms.Create.Values; |
| import org.apache.beam.sdk.transforms.PTransform; |
| import org.apache.beam.sdk.values.PBegin; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.apache.beam.sdk.values.PCollection.IsBounded; |
| import org.apache.beam.sdk.values.PValue; |
| import org.apache.beam.sdk.values.TupleTag; |
| import org.apache.beam.sdk.values.WindowingStrategy; |
| |
| /** |
| * An implementation of {@link Create} that returns a primitive {@link PCollection}. |
| */ |
| public class PrimitiveCreate<T> extends PTransform<PBegin, PCollection<T>> { |
| private final Create.Values<T> transform; |
| private final Coder<T> coder; |
| |
| private PrimitiveCreate(Create.Values<T> transform, Coder<T> coder) { |
| this.transform = transform; |
| this.coder = coder; |
| } |
| |
| @Override |
| public PCollection<T> expand(PBegin input) { |
| return PCollection.createPrimitiveOutputInternal( |
| input.getPipeline(), WindowingStrategy.globalDefault(), IsBounded.BOUNDED, coder); |
| } |
| |
| public Iterable<T> getElements() { |
| return transform.getElements(); |
| } |
| |
| /** |
| * A {@link PTransformOverrideFactory} that creates instances of {@link PrimitiveCreate}. |
| */ |
| public static class Factory<T> |
| implements PTransformOverrideFactory<PBegin, PCollection<T>, Values<T>> { |
| @Override |
| public PTransformReplacement<PBegin, PCollection<T>> getReplacementTransform( |
| AppliedPTransform<PBegin, PCollection<T>, Values<T>> transform) { |
| return PTransformReplacement.of( |
| transform.getPipeline().begin(), |
| new PrimitiveCreate<T>( |
| transform.getTransform(), |
| ((PCollection<T>) Iterables.getOnlyElement(transform.getOutputs().values())) |
| .getCoder())); |
| } |
| |
| @Override |
| public Map<PValue, ReplacementOutput> mapOutputs( |
| Map<TupleTag<?>, PValue> outputs, PCollection<T> newOutput) { |
| return ReplacementOutputs.singleton(outputs, newOutput); |
| } |
| } |
| } |
| |