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A module that is everything required to understands Druid Segments

There is a newer version: 31.0.0

/*
 * 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.druid.timeline.partition;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.RangeSet;
import org.apache.druid.data.input.InputRow;

import java.util.List;
import java.util.Map;

/**
 * {@link ShardSpec} with no partitioning in a time chunk, i.e. a single segment
 * per time chunk. This shard spec has been deprecated and is not generated by
 * the Druid code anymore. The class has been retained only for backward
 * compatibility reasons.
 * 
 * For more information, refer to
 * PR #6883.
 *
 * @deprecated Since Druid 0.15.0. Segments generated by Druid 0.15.0 onwards
 * do not use this shard spec.
 */
@Deprecated
public class NoneShardSpec implements ShardSpec
{
  private static final NoneShardSpec INSTANCE = new NoneShardSpec();

  @JsonCreator
  public static NoneShardSpec instance()
  {
    return INSTANCE;
  }

  private NoneShardSpec()
  {
    // empty
  }

  @Override
  public  PartitionChunk createChunk(T obj)
  {
    return new SingleElementPartitionChunk<>(obj);
  }

  @Override
  @JsonIgnore
  public int getPartitionNum()
  {
    return 0;
  }

  @Override
  public int getNumCorePartitions()
  {
    return 0;
  }

  @Override
  public ShardSpecLookup getLookup(final List shardSpecs)
  {
    return (long timestamp, InputRow row) -> shardSpecs.get(0);
  }

  @Override
  public List getDomainDimensions()
  {
    return ImmutableList.of();
  }

  @Override
  public boolean possibleInDomain(Map> domain)
  {
    return true;
  }

  @Override
  public String getType()
  {
    return Type.NONE;
  }

  @Override
  public boolean equals(Object obj)
  {
    return obj instanceof NoneShardSpec;
  }

  @Override
  public int hashCode()
  {
    return 0;
  }

  @Override
  public String toString()
  {
    return "NoneShardSpec";
  }
}