| /* |
| * 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.v26_0_jre.com.google.common.base.Preconditions.checkArgument; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import org.apache.beam.model.pipeline.v1.SchemaApi; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.coders.IterableCoder; |
| import org.apache.beam.sdk.coders.KvCoder; |
| import org.apache.beam.sdk.coders.LengthPrefixCoder; |
| import org.apache.beam.sdk.coders.RowCoder; |
| import org.apache.beam.sdk.schemas.Schema; |
| import org.apache.beam.sdk.transforms.windowing.BoundedWindow; |
| import org.apache.beam.sdk.util.InstanceBuilder; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.beam.sdk.util.WindowedValue.FullWindowedValueCoder; |
| import org.apache.beam.vendor.grpc.v1p21p0.com.google.protobuf.InvalidProtocolBufferException; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableList; |
| |
| /** {@link CoderTranslator} implementations for known coder types. */ |
| class CoderTranslators { |
| private CoderTranslators() {} |
| |
| static <T extends Coder<?>> CoderTranslator<T> atomic(final Class<T> clazz) { |
| return new SimpleStructuredCoderTranslator<T>() { |
| @Override |
| public List<? extends Coder<?>> getComponents(T from) { |
| return Collections.emptyList(); |
| } |
| |
| @Override |
| public T fromComponents(List<Coder<?>> components) { |
| return InstanceBuilder.ofType(clazz).build(); |
| } |
| }; |
| } |
| |
| static CoderTranslator<KvCoder<?, ?>> kv() { |
| return new SimpleStructuredCoderTranslator<KvCoder<?, ?>>() { |
| @Override |
| public List<? extends Coder<?>> getComponents(KvCoder<?, ?> from) { |
| return ImmutableList.of(from.getKeyCoder(), from.getValueCoder()); |
| } |
| |
| @Override |
| public KvCoder<?, ?> fromComponents(List<Coder<?>> components) { |
| return KvCoder.of(components.get(0), components.get(1)); |
| } |
| }; |
| } |
| |
| static CoderTranslator<IterableCoder<?>> iterable() { |
| return new SimpleStructuredCoderTranslator<IterableCoder<?>>() { |
| @Override |
| public List<? extends Coder<?>> getComponents(IterableCoder<?> from) { |
| return Collections.singletonList(from.getElemCoder()); |
| } |
| |
| @Override |
| public IterableCoder<?> fromComponents(List<Coder<?>> components) { |
| return IterableCoder.of(components.get(0)); |
| } |
| }; |
| } |
| |
| static CoderTranslator<Timer.Coder<?>> timer() { |
| return new SimpleStructuredCoderTranslator<Timer.Coder<?>>() { |
| @Override |
| public List<? extends Coder<?>> getComponents(Timer.Coder<?> from) { |
| return from.getCoderArguments(); |
| } |
| |
| @Override |
| public Timer.Coder<?> fromComponents(List<Coder<?>> components) { |
| return Timer.Coder.of(components.get(0)); |
| } |
| }; |
| } |
| |
| static CoderTranslator<LengthPrefixCoder<?>> lengthPrefix() { |
| return new SimpleStructuredCoderTranslator<LengthPrefixCoder<?>>() { |
| @Override |
| public List<? extends Coder<?>> getComponents(LengthPrefixCoder<?> from) { |
| return Collections.singletonList(from.getValueCoder()); |
| } |
| |
| @Override |
| public LengthPrefixCoder<?> fromComponents(List<Coder<?>> components) { |
| return LengthPrefixCoder.of(components.get(0)); |
| } |
| }; |
| } |
| |
| static CoderTranslator<FullWindowedValueCoder<?>> fullWindowedValue() { |
| return new SimpleStructuredCoderTranslator<FullWindowedValueCoder<?>>() { |
| @Override |
| public List<? extends Coder<?>> getComponents(FullWindowedValueCoder<?> from) { |
| return ImmutableList.of(from.getValueCoder(), from.getWindowCoder()); |
| } |
| |
| @Override |
| public FullWindowedValueCoder<?> fromComponents(List<Coder<?>> components) { |
| return WindowedValue.getFullCoder( |
| components.get(0), (Coder<BoundedWindow>) components.get(1)); |
| } |
| }; |
| } |
| |
| static CoderTranslator<RowCoder> row() { |
| return new CoderTranslator<RowCoder>() { |
| @Override |
| public List<? extends Coder<?>> getComponents(RowCoder from) { |
| return ImmutableList.of(); |
| } |
| |
| @Override |
| public byte[] getPayload(RowCoder from) { |
| return SchemaTranslation.schemaToProto(from.getSchema()).toByteArray(); |
| } |
| |
| @Override |
| public RowCoder fromComponents(List<Coder<?>> components, byte[] payload) { |
| checkArgument( |
| components.isEmpty(), "Expected empty component list, but received: " + components); |
| Schema schema; |
| try { |
| schema = SchemaTranslation.fromProto(SchemaApi.Schema.parseFrom(payload)); |
| } catch (InvalidProtocolBufferException e) { |
| throw new RuntimeException("Unable to parse schema for RowCoder: ", e); |
| } |
| return RowCoder.of(schema); |
| } |
| }; |
| } |
| |
| public abstract static class SimpleStructuredCoderTranslator<T extends Coder<?>> |
| implements CoderTranslator<T> { |
| @Override |
| public final T fromComponents(List<Coder<?>> components, byte[] payload) { |
| return fromComponents(components); |
| } |
| |
| protected abstract T fromComponents(List<Coder<?>> components); |
| } |
| } |