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A module that is everything required to understands Druid Segments
/*
* 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 com.google.common.collect.Ordering;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
public class CompressedByteBufferObjectStrategy extends FixedSizeCompressedObjectStrategy
{
public static final Ordering ORDERING = Ordering.natural().nullsFirst();
public static CompressedByteBufferObjectStrategy getBufferForOrder(final ByteOrder order, final CompressionStrategy compression, final int sizePer)
{
return new CompressedByteBufferObjectStrategy(order, compression, sizePer);
}
public CompressedByteBufferObjectStrategy(
ByteOrder order,
CompressionStrategy compression,
final int sizePer
)
{
super(
order, new BufferConverter()
{
@Override
public ByteBuffer convert(ByteBuffer buf)
{
return buf;
}
@Override
public int compare(ByteBuffer lhs, ByteBuffer rhs)
{
return ORDERING.compare(lhs, rhs);
}
@Override
public int sizeOf(int count)
{
return count; // 1 byte per element
}
@Override
public ByteBuffer combine(ByteBuffer into, ByteBuffer from)
{
return into.put(from);
}
}, compression, sizePer
);
}
}
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