| /* |
| * 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.Collection; |
| import java.util.Map; |
| import org.apache.beam.sdk.runners.AppliedPTransform; |
| import org.apache.beam.sdk.transforms.PTransform; |
| 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.ImmutableList; |
| |
| /** Utilities for extracting subsets of inputs from an {@link AppliedPTransform}. */ |
| public class TransformInputs { |
| /** |
| * Gets all inputs of the {@link AppliedPTransform} that are not returned by {@link |
| * PTransform#getAdditionalInputs()}. |
| */ |
| public static Collection<PValue> nonAdditionalInputs(AppliedPTransform<?, ?, ?> application) { |
| ImmutableList.Builder<PValue> mainInputs = ImmutableList.builder(); |
| PTransform<?, ?> transform = application.getTransform(); |
| for (Map.Entry<TupleTag<?>, PValue> input : application.getInputs().entrySet()) { |
| if (!transform.getAdditionalInputs().containsKey(input.getKey())) { |
| mainInputs.add(input.getValue()); |
| } |
| } |
| checkArgument( |
| !mainInputs.build().isEmpty() || application.getInputs().isEmpty(), |
| "Expected at least one main input if any inputs exist"); |
| return mainInputs.build(); |
| } |
| } |