| /* |
| * 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 static org.apache.beam.vendor.guava.v20_0.com.google.common.base.Preconditions.checkArgument; |
| |
| import java.util.Map; |
| import java.util.Set; |
| import org.apache.beam.sdk.runners.AppliedPTransform; |
| import org.apache.beam.sdk.transforms.PTransform; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.apache.beam.sdk.values.PValue; |
| import org.apache.beam.sdk.values.TupleTag; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.Iterables; |
| |
| /** */ |
| public class PTransformReplacements { |
| /** |
| * Gets the singleton input of an {@link AppliedPTransform}, ignoring any additional inputs |
| * returned by {@link PTransform#getAdditionalInputs()}. |
| */ |
| public static <T> PCollection<T> getSingletonMainInput( |
| AppliedPTransform<? extends PCollection<? extends T>, ?, ?> application) { |
| return getSingletonMainInput( |
| application.getInputs(), application.getTransform().getAdditionalInputs().keySet()); |
| } |
| |
| private static <T> PCollection<T> getSingletonMainInput( |
| Map<TupleTag<?>, PValue> inputs, Set<TupleTag<?>> ignoredTags) { |
| PCollection<T> mainInput = null; |
| for (Map.Entry<TupleTag<?>, PValue> input : inputs.entrySet()) { |
| if (!ignoredTags.contains(input.getKey())) { |
| checkArgument( |
| mainInput == null, |
| "Got multiple inputs that are not additional inputs for a " |
| + "singleton main input: %s and %s", |
| mainInput, |
| input.getValue()); |
| checkArgument( |
| input.getValue() instanceof PCollection, |
| "Unexpected input type %s", |
| input.getValue().getClass()); |
| mainInput = (PCollection<T>) input.getValue(); |
| } |
| } |
| checkArgument( |
| mainInput != null, |
| "No main input found in inputs: Inputs %s, Side Input tags %s", |
| inputs, |
| ignoredTags); |
| return mainInput; |
| } |
| |
| public static <T> PCollection<T> getSingletonMainOutput( |
| AppliedPTransform<?, PCollection<T>, ? extends PTransform<?, PCollection<T>>> transform) { |
| return (PCollection<T>) Iterables.getOnlyElement(transform.getOutputs().values()); |
| } |
| } |