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A module that is everything required to understands Druid Segments
There is a newer version: 0.12.3
/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.query.spec;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import io.druid.common.utils.JodaUtils;
import io.druid.query.Query;
import io.druid.query.QueryRunner;
import io.druid.query.QuerySegmentWalker;
import io.druid.query.SegmentDescriptor;
import org.joda.time.Interval;

import java.util.List;

/**
 */
public class MultipleSpecificSegmentSpec implements QuerySegmentSpec
{
  private final List descriptors;

  private volatile List intervals = null;

  @JsonCreator
  public MultipleSpecificSegmentSpec(
      @JsonProperty("segments") List descriptors
  )
  {
    this.descriptors = descriptors;
  }

  @JsonProperty("segments")
  public List getDescriptors()
  {
    return descriptors;
  }

  @Override
  public List getIntervals()
  {
    if (intervals != null) {
      return intervals;
    }

    intervals = JodaUtils.condenseIntervals(
        Iterables.transform(
            descriptors,
            new Function()
            {
              @Override
              public Interval apply(SegmentDescriptor input)
              {
                return input.getInterval();
              }
            }
        )
    );

    return intervals;
  }

  @Override
  public  QueryRunner lookup(Query query, QuerySegmentWalker walker)
  {
    return walker.getQueryRunnerForSegments(query, descriptors);
  }

  @Override
  public String toString()
  {
    return "MultipleSpecificSegmentSpec{" +
           "descriptors=" + descriptors +
           '}';
  }

  @Override
  public boolean equals(Object o)
  {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    MultipleSpecificSegmentSpec that = (MultipleSpecificSegmentSpec) o;

    if (descriptors != null ? !descriptors.equals(that.descriptors) : that.descriptors != null) return false;
    if (intervals != null ? !intervals.equals(that.intervals) : that.intervals != null) return false;

    return true;
  }

  @Override
  public int hashCode()
  {
    int result = descriptors != null ? descriptors.hashCode() : 0;
    result = 31 * result + (intervals != null ? intervals.hashCode() : 0);
    return result;
  }
}