content: /*
   * 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.io;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.util.Collections;
  import java.util.List;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.coders.CoderException;
  import org.apache.beam.sdk.coders.StructuredCoder;
  import org.apache.beam.sdk.coders.VarIntCoder;
  import org.apache.beam.sdk.io.fs.MatchResult;
  import org.apache.beam.sdk.io.fs.MatchResult.Metadata;
  import org.apache.beam.sdk.io.fs.MetadataCoder;
  import org.checkerframework.checker.initialization.qual.Initialized;
  import org.checkerframework.checker.nullness.qual.NonNull;
  import org.checkerframework.checker.nullness.qual.UnknownKeyFor;
  
  /** A {@link Coder} for {@link org.apache.beam.sdk.io.FileIO.ReadableFile}. */
  public class ReadableFileCoder extends StructuredCoder<FileIO.ReadableFile> {
  
    private final Coder<Metadata> metadataCoder;
  
    public static ReadableFileCoder of(Coder<Metadata> metadataCoder) {
      return new ReadableFileCoder(metadataCoder);
    }
  
    public static ReadableFileCoder of() {
      return new ReadableFileCoder(MetadataCoder.of());
    }
  
    public Coder<Metadata> getMetadataCoder() {
      return metadataCoder;
    }
  
    private ReadableFileCoder(Coder<Metadata> metadataCoder) {
      this.metadataCoder = metadataCoder;
    }
  
    @Override
    public void encode(
        FileIO.ReadableFile value, @UnknownKeyFor @NonNull @Initialized OutputStream outStream)
        throws CoderException, IOException {
      getMetadataCoder().encode(value.getMetadata(), outStream);
      VarIntCoder.of().encode(value.getCompression().ordinal(), outStream);
    }
  
    @Override
    public FileIO.ReadableFile decode(@UnknownKeyFor @NonNull @Initialized InputStream inStream)
        throws CoderException, IOException {
      MatchResult.Metadata metadata = getMetadataCoder().decode(inStream);
      Compression compression = Compression.values()[VarIntCoder.of().decode(inStream)];
      return new FileIO.ReadableFile(metadata, compression);
    }
  
    @Override
    public @UnknownKeyFor @NonNull @Initialized List<? extends Coder<?>> getCoderArguments() {
      return Collections.singletonList(metadataCoder);
    }
  
    @Override
    public void verifyDeterministic() throws NonDeterministicException {
      // ignore the default Metadata coder for backward compatible
      if (!getMetadataCoder().equals(MetadataCoder.of())) {
        verifyDeterministic(this, "Metadata coder must be deterministic", getMetadataCoder());
      }
    }
  }
  