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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.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import com.google.common.collect.Ordering;
import com.metamx.common.ISE;
import com.metamx.common.guava.Sequence;
import io.druid.query.spec.QuerySegmentSpec;
import org.joda.time.Duration;
import org.joda.time.Interval;

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

/**
 */
public abstract class BaseQuery> implements Query
{
  public static  int getContextPriority(Query query, int defaultValue)
  {
    return parseInt(query, "priority", defaultValue);
  }

  public static  boolean getContextBySegment(Query query, boolean defaultValue)
  {
    return parseBoolean(query, "bySegment", defaultValue);
  }

  public static  boolean getContextPopulateCache(Query query, boolean defaultValue)
  {
    return parseBoolean(query, "populateCache", defaultValue);
  }

  public static  boolean getContextUseCache(Query query, boolean defaultValue)
  {
    return parseBoolean(query, "useCache", defaultValue);
  }

  public static  boolean getContextFinalize(Query query, boolean defaultValue)
  {
    return parseBoolean(query, "finalize", defaultValue);
  }

  public static  int getContextUncoveredIntervalsLimit(Query query, int defaultValue)
  {
    return parseInt(query, "uncoveredIntervalsLimit", defaultValue);
  }

  private static  int parseInt(Query query, String key, int defaultValue)
  {
    Object val = query.getContextValue(key);
    if (val == null) {
      return defaultValue;
    }
    if (val instanceof String) {
      return Integer.parseInt((String) val);
    } else if (val instanceof Integer) {
      return (int) val;
    } else {
      throw new ISE("Unknown type [%s]", val.getClass());
    }
  }

  private static  boolean parseBoolean(Query query, String key, boolean defaultValue)
  {
    Object val = query.getContextValue(key);
    if (val == null) {
      return defaultValue;
    }
    if (val instanceof String) {
      return Boolean.parseBoolean((String) val);
    } else if (val instanceof Boolean) {
      return (boolean) val;
    } else {
      throw new ISE("Unknown type [%s]. Cannot parse!", val.getClass());
    }
  }

  public static final String QUERYID = "queryId";
  private final DataSource dataSource;
  private final boolean descending;
  private final Map context;
  private final QuerySegmentSpec querySegmentSpec;
  private volatile Duration duration;

  public BaseQuery(
      DataSource dataSource,
      QuerySegmentSpec querySegmentSpec,
      boolean descending,
      Map context
  )
  {
    Preconditions.checkNotNull(dataSource, "dataSource can't be null");
    Preconditions.checkNotNull(querySegmentSpec, "querySegmentSpec can't be null");

    this.dataSource = dataSource;
    this.context = context;
    this.querySegmentSpec = querySegmentSpec;
    this.descending = descending;
  }

  @JsonProperty
  @Override
  public DataSource getDataSource()
  {
    return dataSource;
  }

  @JsonProperty
  @Override
  public boolean isDescending()
  {
    return descending;
  }

  @JsonProperty("intervals")
  public QuerySegmentSpec getQuerySegmentSpec()
  {
    return querySegmentSpec;
  }

  @Override
  public Sequence run(QuerySegmentWalker walker, Map context)
  {
    return run(querySegmentSpec.lookup(this, walker), context);
  }

  public Sequence run(QueryRunner runner, Map context)
  {
    return runner.run(this, context);
  }

  @Override
  public List getIntervals()
  {
    return querySegmentSpec.getIntervals();
  }

  @Override
  public Duration getDuration()
  {
    if (duration == null) {
      Duration totalDuration = new Duration(0);
      for (Interval interval : querySegmentSpec.getIntervals()) {
        if (interval != null) {
          totalDuration = totalDuration.plus(interval.toDuration());
        }
      }
      duration = totalDuration;
    }

    return duration;
  }

  @Override
  @JsonProperty
  public Map getContext()
  {
    return context;
  }

  @Override
  public  ContextType getContextValue(String key)
  {
    return context == null ? null : (ContextType) context.get(key);
  }

  @Override
  public  ContextType getContextValue(String key, ContextType defaultValue)
  {
    ContextType retVal = getContextValue(key);
    return retVal == null ? defaultValue : retVal;
  }

  protected Map computeOverridenContext(Map overrides)
  {
    Map overridden = Maps.newTreeMap();
    final Map context = getContext();
    if (context != null) {
      overridden.putAll(context);
    }
    overridden.putAll(overrides);

    return overridden;
  }

  @Override
  public Ordering getResultOrdering()
  {
    Ordering retVal = Ordering.natural();
    return descending ? retVal.reverse() : retVal;
  }

  @Override
  public String getId()
  {
    return (String) getContextValue(QUERYID);
  }

  @Override
  public Query withId(String id)
  {
    return withOverriddenContext(ImmutableMap.of(QUERYID, id));
  }

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

    BaseQuery baseQuery = (BaseQuery) o;

    if (descending != baseQuery.descending) {
      return false;
    }
    if (context != null ? !context.equals(baseQuery.context) : baseQuery.context != null) {
      return false;
    }
    if (dataSource != null ? !dataSource.equals(baseQuery.dataSource) : baseQuery.dataSource != null) {
      return false;
    }
    if (duration != null ? !duration.equals(baseQuery.duration) : baseQuery.duration != null) {
      return false;
    }
    if (querySegmentSpec != null
        ? !querySegmentSpec.equals(baseQuery.querySegmentSpec)
        : baseQuery.querySegmentSpec != null) {
      return false;
    }

    return true;
  }

  @Override
  public int hashCode()
  {
    int result = dataSource != null ? dataSource.hashCode() : 0;
    result = 31 * result + (descending ? 1 : 0);
    result = 31 * result + (context != null ? context.hashCode() : 0);
    result = 31 * result + (querySegmentSpec != null ? querySegmentSpec.hashCode() : 0);
    result = 31 * result + (duration != null ? duration.hashCode() : 0);
    return result;
  }
}