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.fs;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import org.apache.beam.sdk.coders.AtomicCoder;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.coders.VarIntCoder;
  import org.apache.beam.sdk.coders.VarLongCoder;
  import org.apache.beam.sdk.io.fs.MatchResult.Metadata;
  
  /**
   * A {@link Coder} for {@link Metadata}.
   *
   * <p>The {@link Metadata#lastModifiedMillis()} field was added after this coder was already
   * deployed, so this class decodes a default value for backwards compatibility. See {@link
   * MetadataCoderV2} for retaining timestamp information.
   */
  public class MetadataCoder extends AtomicCoder<Metadata> {
    private static final MetadataCoder INSTANCE = new MetadataCoder();
    private static final ResourceIdCoder RESOURCE_ID_CODER = ResourceIdCoder.of();
    private static final VarIntCoder INT_CODER = VarIntCoder.of();
    private static final VarLongCoder LONG_CODER = VarLongCoder.of();
  
    private MetadataCoder() {}
  
    /** Returns the singleton {@link MetadataCoder} instance. */
    public static MetadataCoder of() {
      return INSTANCE;
    }
  
    @Override
    public void encode(Metadata value, OutputStream os) throws IOException {
      RESOURCE_ID_CODER.encode(value.resourceId(), os);
      INT_CODER.encode(value.isReadSeekEfficient() ? 1 : 0, os);
      LONG_CODER.encode(value.sizeBytes(), os);
    }
  
    @Override
    public Metadata decode(InputStream is) throws IOException {
      return decodeBuilder(is).build();
    }
  
    Metadata.Builder decodeBuilder(InputStream is) throws IOException {
      ResourceId resourceId = RESOURCE_ID_CODER.decode(is);
      boolean isReadSeekEfficient = INT_CODER.decode(is) == 1;
      long sizeBytes = LONG_CODER.decode(is);
      return Metadata.builder()
          .setResourceId(resourceId)
          .setIsReadSeekEfficient(isReadSeekEfficient)
          .setSizeBytes(sizeBytes);
    }
  
    @Override
    public boolean consistentWithEquals() {
      return true;
    }
  }
  