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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;

import com.google.common.collect.Ordering;
import com.google.common.primitives.Longs;
import io.druid.granularity.QueryGranularity;

import java.util.Comparator;

/**
 */
public class ResultGranularTimestampComparator implements Comparator>
{
  private final QueryGranularity gran;

  public ResultGranularTimestampComparator(QueryGranularity granularity)
  {
    this.gran = granularity;
  }

  @Override
  public int compare(Result r1, Result r2)
  {
    return Longs.compare(
        gran.truncate(r1.getTimestamp().getMillis()),
        gran.truncate(r2.getTimestamp().getMillis())
    );
  }

  public static  Ordering> create(QueryGranularity granularity, boolean descending) {
    Comparator> comparator = new ResultGranularTimestampComparator<>(granularity);
    return descending ? Ordering.from(comparator).reverse() : Ordering.from(comparator);
  }
}