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A module that is everything required to understands Druid Segments

There is a newer version: 31.0.0

/*
 * 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.segment;

/**
 * Implementation of {@link TransformableRowIterator} that just delegates all methods to some baseIterator (adapter
 * pattern). Subclass should override some methods.
 */
public abstract class ForwardingRowIterator implements TransformableRowIterator
{
  protected final TransformableRowIterator baseIterator;

  protected ForwardingRowIterator(TransformableRowIterator baseIterator)
  {
    this.baseIterator = baseIterator;
  }

  @Override
  public void mark()
  {
    baseIterator.mark();
  }

  @Override
  public TimeAndDimsPointer getMarkedPointer()
  {
    return baseIterator.getMarkedPointer();
  }

  @Override
  public boolean hasTimeAndDimsChangedSinceMark()
  {
    return baseIterator.hasTimeAndDimsChangedSinceMark();
  }

  @Override
  public RowPointer getPointer()
  {
    return baseIterator.getPointer();
  }

  @Override
  public boolean moveToNext()
  {
    return baseIterator.moveToNext();
  }

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