io.druid.query.BySegmentQueryRunner Maven / Gradle / Ivy

/*
 * 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.Lists;
import io.druid.java.util.common.guava.Sequence;
import io.druid.java.util.common.guava.Sequences;
import org.joda.time.DateTime;

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

/**
 */
public class BySegmentQueryRunner implements QueryRunner
{
  private final String segmentIdentifier;
  private final DateTime timestamp;
  private final QueryRunner base;

  public BySegmentQueryRunner(
      String segmentIdentifier,
      DateTime timestamp,
      QueryRunner base
  )
  {
    this.segmentIdentifier = segmentIdentifier;
    this.timestamp = timestamp;
    this.base = base;
  }

  @Override
  @SuppressWarnings("unchecked")
  public Sequence run(final QueryPlus queryPlus, Map responseContext)
  {
    if (QueryContexts.isBySegment(queryPlus.getQuery())) {
      final Sequence baseSequence = base.run(queryPlus, responseContext);
      final List results = Sequences.toList(baseSequence, Lists.newArrayList());
      return Sequences.simple(
          Collections.singletonList(
              (T) new Result>(
                  timestamp,
                  new BySegmentResultValueClass(
                      results,
                      segmentIdentifier,
                      queryPlus.getQuery().getIntervals().get(0)
                  )
              )
          )
      );
    }
    return base.run(queryPlus, responseContext);
  }
}