com.metamx.collections.bitmap.BitSetBitmapFactory Maven / Gradle / Ivy

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/*
 * Copyright 2011 - 2015 Metamarkets Group Inc.
 *
 * Licensed 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 com.metamx.collections.bitmap;

import java.nio.ByteBuffer;
import java.util.BitSet;

/**
 * BitSetBitmapFactory implements BitmapFactory as a wrapper for java.util.BitSet
 */
public class BitSetBitmapFactory implements BitmapFactory
{
  @Override
  public MutableBitmap makeEmptyMutableBitmap()
  {
    return new WrappedBitSetBitmap();
  }

  @Override
  public ImmutableBitmap makeEmptyImmutableBitmap()
  {
    return makeEmptyMutableBitmap();
  }

  @Override
  public ImmutableBitmap makeImmutableBitmap(MutableBitmap mutableBitmap)
  {
    return mutableBitmap;
  }

  @Override
  public ImmutableBitmap mapImmutableBitmap(ByteBuffer b)
  {
    return new WrappedBitSetBitmap(BitSet.valueOf(b.array()));
  }

  @Override
  public ImmutableBitmap union(Iterable b)
  {
    WrappedBitSetBitmap newSet = null;
    for (ImmutableBitmap bm : b) {
      if (null == newSet) {
        newSet = new WrappedBitSetBitmap(((WrappedBitSetBitmap) bm).cloneBitSet());
      } else {
        newSet.union(bm);
      }
    }
    return newSet;
  }

  @Override
  public ImmutableBitmap intersection(Iterable b)
  {

    WrappedBitSetBitmap newSet = null;
    for (ImmutableBitmap bm : b) {
      if (null == newSet) {
        newSet = new WrappedBitSetBitmap(((WrappedBitSetBitmap) bm).cloneBitSet());
      } else {
        newSet.intersection(bm);
      }
    }
    return newSet;
  }

  @Override
  public ImmutableBitmap complement(ImmutableBitmap b)
  {
    BitSet bitSet = ((WrappedBitSetBitmap) b).cloneBitSet();
    bitSet.flip(0, bitSet.size());
    return new WrappedBitSetBitmap(bitSet);
  }

  @Override
  public ImmutableBitmap complement(
      ImmutableBitmap b, int length
  )
  {
    return null;
  }
}