io.druid.segment.data.ConciseBitmapSerdeFactory Maven / Gradle / Ivy
/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.segment.data;
import java.nio.ByteBuffer;
import com.google.common.collect.Ordering;
import io.druid.collections.bitmap.BitmapFactory;
import io.druid.collections.bitmap.ConciseBitmapFactory;
import io.druid.collections.bitmap.ImmutableBitmap;
import io.druid.collections.bitmap.WrappedImmutableConciseBitmap;
import io.druid.extendedset.intset.ImmutableConciseSet;
/**
*/
public class ConciseBitmapSerdeFactory implements BitmapSerdeFactory
{
private static final ObjectStrategy objectStrategy = new ImmutableConciseSetObjectStrategy();
private static final BitmapFactory bitmapFactory = new ConciseBitmapFactory();
@Override
public ObjectStrategy getObjectStrategy()
{
return objectStrategy;
}
@Override
public BitmapFactory getBitmapFactory()
{
return bitmapFactory;
}
private static final Ordering CONCISE_COMPARATOR = new Ordering()
{
@Override
public int compare(
WrappedImmutableConciseBitmap conciseSet, WrappedImmutableConciseBitmap conciseSet1
)
{
if (conciseSet.isEmpty() && conciseSet1.isEmpty()) {
return 0;
}
if (conciseSet.isEmpty()) {
return -1;
}
if (conciseSet1.isEmpty()) {
return 1;
}
return conciseSet.compareTo(conciseSet1);
}
}.nullsFirst();
private static class ImmutableConciseSetObjectStrategy
implements ObjectStrategy
{
@Override
public Class getClazz()
{
return ImmutableBitmap.class;
}
@Override
public WrappedImmutableConciseBitmap fromByteBuffer(ByteBuffer buffer, int numBytes)
{
buffer.limit(buffer.position() + numBytes);
return new WrappedImmutableConciseBitmap(new ImmutableConciseSet(buffer));
}
@Override
public byte[] toBytes(ImmutableBitmap val)
{
if (val == null || val.isEmpty()) {
return new byte[]{};
}
return val.toBytes();
}
@Override
public int compare(ImmutableBitmap o1, ImmutableBitmap o2)
{
return CONCISE_COMPARATOR.compare((WrappedImmutableConciseBitmap) o1, (WrappedImmutableConciseBitmap) o2);
}
}
@Override
public String toString()
{
return "ConciseBitmapSerdeFactory{}";
}
@Override
public boolean equals(Object o)
{
return this == o || o instanceof ConciseBitmapSerdeFactory;
}
@Override
public int hashCode()
{
return 0;
}
}