org.apache.druid.segment.index.IndexedStringDictionaryEncodedStringValueIndex Maven / Gradle / Ivy

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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.segment.index;

import org.apache.druid.collections.bitmap.BitmapFactory;
import org.apache.druid.collections.bitmap.ImmutableBitmap;
import org.apache.druid.segment.data.Indexed;
import org.apache.druid.segment.index.semantic.DictionaryEncodedStringValueIndex;

import javax.annotation.Nullable;

public final class IndexedStringDictionaryEncodedStringValueIndex>
    implements DictionaryEncodedStringValueIndex
{
  private final BitmapFactory bitmapFactory;
  private final TDictionary dictionary;
  private final Indexed bitmaps;

  public IndexedStringDictionaryEncodedStringValueIndex(
      BitmapFactory bitmapFactory,
      TDictionary dictionary,
      Indexed bitmaps
  )
  {
    this.bitmapFactory = bitmapFactory;
    this.dictionary = dictionary;
    this.bitmaps = bitmaps;
  }

  @Override
  public int getCardinality()
  {
    return dictionary.size();
  }

  @Nullable
  @Override
  public String getValue(int index)
  {
    return dictionary.get(index);
  }

  @Override
  public BitmapFactory getBitmapFactory()
  {
    return bitmapFactory;
  }

  @Override
  public ImmutableBitmap getBitmap(int idx)
  {
    if (idx < 0) {
      return bitmapFactory.makeEmptyImmutableBitmap();
    }

    final ImmutableBitmap bitmap = bitmaps.get(idx);
    return bitmap == null ? bitmapFactory.makeEmptyImmutableBitmap() : bitmap;
  }
}