tajo-storage/tajo-storage-hdfs/src/main/java/org/apache/tajo/storage/fragment/FileFragmentSerde.java

/*
 * 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.tajo.storage.fragment;

import com.google.protobuf.GeneratedMessage.Builder;
import org.apache.hadoop.fs.Path;
import org.apache.tajo.storage.StorageFragmentProtos.FileFragmentProto;

import java.util.ArrayList;
import java.util.List;

public class FileFragmentSerde implements FragmentSerde<FileFragment, FileFragmentProto> {

  @Override
  public Builder newBuilder() {
    return FileFragmentProto.newBuilder();
  }

  @Override
  public FileFragmentProto serialize(FileFragment fragment) {
    FileFragmentProto.Builder builder = FileFragmentProto.newBuilder();
    builder.setId(fragment.inputSourceId);
    builder.setStartOffset(fragment.startKey);
    builder.setLength(fragment.length);
    builder.setPath(fragment.getPath().toString());
    if(fragment.getDiskIds() != null) {
      List<Integer> idList = new ArrayList<>();
      for(int eachId: fragment.getDiskIds()) {
        idList.add(eachId);
      }
      builder.addAllDiskIds(idList);
    }

    if(fragment.hostNames != null) {
      builder.addAllHosts(fragment.hostNames);
    }
    return builder.build();
  }

  @Override
  public FileFragment deserialize(FileFragmentProto proto) {
    return new FileFragment(
        proto.getId(),
        new Path(proto.getPath()),
        proto.getStartOffset(),
        proto.getLength(),
        proto.getHostsList().toArray(new String[proto.getHostsCount()]),
        proto.getDiskIdsList().toArray(new Integer[proto.getDiskIdsCount()]));
  }
}