| /* |
| * 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.sdk.coders; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.List; |
| import org.apache.beam.sdk.util.CoderUtils; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.ImmutableList; |
| import org.xerial.snappy.Snappy; |
| |
| /** |
| * Wraps an existing coder with Snappy compression. It makes sense to use this coder only when it's |
| * likely that the encoded value is quite large and compressible. |
| */ |
| public class SnappyCoder<T> extends StructuredCoder<T> { |
| private final Coder<T> innerCoder; |
| |
| /** Wraps the given coder into a {@link SnappyCoder}. */ |
| public static <T> SnappyCoder<T> of(Coder<T> innerCoder) { |
| return new SnappyCoder<>(innerCoder); |
| } |
| |
| private SnappyCoder(Coder<T> innerCoder) { |
| this.innerCoder = innerCoder; |
| } |
| |
| @Override |
| public void encode(T value, OutputStream os) throws IOException { |
| ByteArrayCoder.of() |
| .encode(Snappy.compress(CoderUtils.encodeToByteArray(innerCoder, value)), os); |
| } |
| |
| @Override |
| public T decode(InputStream is) throws IOException { |
| return CoderUtils.decodeFromByteArray( |
| innerCoder, Snappy.uncompress(ByteArrayCoder.of().decode(is))); |
| } |
| |
| @Override |
| public List<? extends Coder<?>> getCoderArguments() { |
| return ImmutableList.of(innerCoder); |
| } |
| |
| @Override |
| public void verifyDeterministic() throws NonDeterministicException { |
| innerCoder.verifyDeterministic(); |
| } |
| } |