io.druid.query.timeboundary.TimeBoundaryQuery Maven / Gradle / Ivy

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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.timeboundary;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.metamx.common.StringUtils;
import io.druid.common.utils.JodaUtils;
import io.druid.query.BaseQuery;
import io.druid.query.DataSource;
import io.druid.query.Query;
import io.druid.query.Result;
import io.druid.query.spec.MultipleIntervalSegmentSpec;
import io.druid.query.spec.QuerySegmentSpec;
import org.joda.time.DateTime;
import org.joda.time.Interval;

import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

/**
 */
public class TimeBoundaryQuery extends BaseQuery>
{
  public static final Interval MY_Y2K_INTERVAL = new Interval(
      new DateTime("0000-01-01"),
      new DateTime("3000-01-01")
  );
  public static final String MAX_TIME = "maxTime";
  public static final String MIN_TIME = "minTime";

  private static final byte CACHE_TYPE_ID = 0x0;

  private final String bound;

  @JsonCreator
  public TimeBoundaryQuery(
      @JsonProperty("dataSource") DataSource dataSource,
      @JsonProperty("intervals") QuerySegmentSpec querySegmentSpec,
      @JsonProperty("bound") String bound,
      @JsonProperty("context") Map context
  )
  {
    super(
        dataSource,
        (querySegmentSpec == null) ? new MultipleIntervalSegmentSpec(Arrays.asList(MY_Y2K_INTERVAL))
                                   : querySegmentSpec,
        false,
        context
    );

    this.bound = bound == null ? "" : bound;
  }

  @Override
  public boolean hasFilters()
  {
    return false;
  }

  @Override
  public String getType()
  {
    return Query.TIME_BOUNDARY;
  }

  @JsonProperty
  public String getBound()
  {
    return bound;
  }

  @Override
  public TimeBoundaryQuery withOverriddenContext(Map contextOverrides)
  {
    return new TimeBoundaryQuery(
        getDataSource(),
        getQuerySegmentSpec(),
        bound,
        computeOverridenContext(contextOverrides)
    );
  }

  @Override
  public TimeBoundaryQuery withQuerySegmentSpec(QuerySegmentSpec spec)
  {
    return new TimeBoundaryQuery(
        getDataSource(),
        spec,
        bound,
        getContext()
    );
  }

  @Override
  public Query> withDataSource(DataSource dataSource)
  {
    return new TimeBoundaryQuery(
        dataSource,
        getQuerySegmentSpec(),
        bound,
        getContext()
    );
  }

  public byte[] getCacheKey()
  {
    final byte[] boundBytes = StringUtils.toUtf8(bound);
    return ByteBuffer.allocate(1 + boundBytes.length)
                     .put(CACHE_TYPE_ID)
                     .put(boundBytes)
                     .array();
  }

  public Iterable> buildResult(DateTime timestamp, DateTime min, DateTime max)
  {
    List> results = Lists.newArrayList();
    Map result = Maps.newHashMap();

    if (min != null) {
      result.put(MIN_TIME, min);
    }
    if (max != null) {
      result.put(MAX_TIME, max);
    }
    if (!result.isEmpty()) {
      results.add(new Result<>(timestamp, new TimeBoundaryResultValue(result)));
    }

    return results;
  }

  public Iterable> mergeResults(List> results)
  {
    if (results == null || results.isEmpty()) {
      return Lists.newArrayList();
    }

    DateTime min = new DateTime(JodaUtils.MAX_INSTANT);
    DateTime max = new DateTime(JodaUtils.MIN_INSTANT);
    for (Result result : results) {
      TimeBoundaryResultValue val = result.getValue();

      DateTime currMinTime = val.getMinTime();
      if (currMinTime != null && currMinTime.isBefore(min)) {
        min = currMinTime;
      }
      DateTime currMaxTime = val.getMaxTime();
      if (currMaxTime != null && currMaxTime.isAfter(max)) {
        max = currMaxTime;
      }
    }

    final DateTime ts;
    final DateTime minTime;
    final DateTime maxTime;

    if (bound.equalsIgnoreCase(MIN_TIME)) {
      ts = min;
      minTime = min;
      maxTime = null;
    } else if (bound.equalsIgnoreCase(MAX_TIME)) {
      ts = max;
      minTime = null;
      maxTime = max;
    } else {
      ts = min;
      minTime = min;
      maxTime = max;
    }

    return buildResult(ts, minTime, maxTime);
  }

  @Override
  public String toString()
  {
    return "TimeBoundaryQuery{" +
           "dataSource='" + getDataSource() + '\'' +
           ", querySegmentSpec=" + getQuerySegmentSpec() +
           ", duration=" + getDuration() +
           ", bound=" + bound +
           '}';
  }

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

    TimeBoundaryQuery that = (TimeBoundaryQuery) o;

    if (!bound.equals(that.bound)) {
      return false;
    }

    return true;
  }

  @Override
  public int hashCode()
  {
    int result = super.hashCode();
    result = 31 * result + bound.hashCode();
    return result;
  }
}