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A module that is everything required to understands Druid Segments

There is a newer version: 30.0.1

/*
 * 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.frame.write.columnar;

import org.apache.datasketches.memory.WritableMemory;
import org.apache.druid.frame.allocation.MemoryAllocator;
import org.apache.druid.segment.BaseDoubleColumnValueSelector;

public class DoubleFrameColumnWriter implements FrameColumnWriter
{
  private final BaseDoubleColumnValueSelector selector;
  private final DoubleFrameMaker maker;

  DoubleFrameColumnWriter(
      BaseDoubleColumnValueSelector selector,
      MemoryAllocator allocator,
      boolean hasNulls
  )
  {
    this.selector = selector;
    this.maker = new DoubleFrameMaker(allocator, hasNulls);
  }

  @Override
  public boolean addSelection()
  {
    if (selector.isNull()) {
      return maker.addNull();
    } else {
      return maker.add(selector.getDouble());
    }
  }

  @Override
  public void undo()
  {
    maker.undo();
  }

  @Override
  public long size()
  {
    return maker.size();
  }

  @Override
  public long writeTo(final WritableMemory memory, final long startPosition)
  {
    return maker.writeTo(memory, startPosition);
  }

  @Override
  public void close()
  {
    maker.close();
  }
}