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A module that is everything required to understands Druid Segments

There is a newer version: 30.0.0

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 org.apache.druid.query.operator;

import org.apache.druid.query.operator.window.Processor;
import org.apache.druid.query.rowsandcols.RowsAndColumns;

import java.io.Closeable;

/**
 * An Operator that applies a {@link Processor}, see javadoc on that interface for an explanation.
 */
public class WindowProcessorOperator implements Operator
{
  private final Processor windowProcessor;
  private final Operator child;

  public WindowProcessorOperator(
      Processor windowProcessor,
      Operator child
  )
  {
    this.windowProcessor = windowProcessor;
    this.child = child;
  }

  @Override
  public Closeable goOrContinue(Closeable continuation, Receiver receiver)
  {
    return child.goOrContinue(
        continuation,
        new Receiver()
        {
          @Override
          public Signal push(RowsAndColumns rac)
          {
            return receiver.push(windowProcessor.process(rac));
          }

          @Override
          public void completed()
          {
            receiver.completed();
          }
        }
    );
  }
}