| /* |
| * 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.auto.service.AutoService; |
| import java.util.Collections; |
| import java.util.Map; |
| import org.apache.beam.model.pipeline.v1.RunnerApi; |
| import org.apache.beam.model.pipeline.v1.RunnerApi.FunctionSpec; |
| import org.apache.beam.runners.core.construction.PTransformTranslation.TransformPayloadTranslator; |
| import org.apache.beam.sdk.runners.AppliedPTransform; |
| import org.apache.beam.sdk.transforms.Flatten; |
| import org.apache.beam.sdk.transforms.PTransform; |
| import org.apache.beam.sdk.transforms.windowing.Window.Assign; |
| |
| /** |
| * Utility methods for translating a {@link Assign} to and from {@link RunnerApi} representations. |
| */ |
| public class FlattenTranslator |
| extends TransformPayloadTranslator.WithDefaultRehydration<Flatten.PCollections<?>> { |
| |
| public static TransformPayloadTranslator create() { |
| return new FlattenTranslator(); |
| } |
| |
| private FlattenTranslator() {} |
| |
| @Override |
| public String getUrn(Flatten.PCollections<?> transform) { |
| return PTransformTranslation.FLATTEN_TRANSFORM_URN; |
| } |
| |
| @Override |
| public FunctionSpec translate( |
| AppliedPTransform<?, ?, Flatten.PCollections<?>> transform, SdkComponents components) { |
| return RunnerApi.FunctionSpec.newBuilder().setUrn(getUrn(transform.getTransform())).build(); |
| } |
| |
| /** Registers {@link FlattenTranslator}. */ |
| @AutoService(TransformPayloadTranslatorRegistrar.class) |
| public static class Registrar implements TransformPayloadTranslatorRegistrar { |
| @Override |
| public Map<? extends Class<? extends PTransform>, ? extends TransformPayloadTranslator> |
| getTransformPayloadTranslators() { |
| return Collections.singletonMap(Flatten.PCollections.class, new FlattenTranslator()); |
| } |
| |
| @Override |
| public Map<String, TransformPayloadTranslator> getTransformRehydrators() { |
| return Collections.emptyMap(); |
| } |
| } |
| } |