io.druid.segment.data.CompressedLongBufferObjectStrategy.java Source code

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Here is the source code for io.druid.segment.data.CompressedLongBufferObjectStrategy.java

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/*
 * Druid - a distributed column store.
 * Copyright 2012 - 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 io.druid.segment.data;

import com.google.common.collect.Ordering;
import com.google.common.primitives.Longs;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.LongBuffer;

/**
*/
public class CompressedLongBufferObjectStrategy extends FixedSizeCompressedObjectStrategy<LongBuffer> {
    public static CompressedLongBufferObjectStrategy getBufferForOrder(final ByteOrder order,
            final CompressionStrategy compression, final int sizePer) {
        return new CompressedLongBufferObjectStrategy(order, compression, sizePer);
    }

    private CompressedLongBufferObjectStrategy(final ByteOrder order, final CompressionStrategy compression,
            final int sizePer) {
        super(order, new BufferConverter<LongBuffer>() {
            @Override
            public LongBuffer convert(ByteBuffer buf) {
                return buf.asLongBuffer();
            }

            @Override
            public int compare(LongBuffer lhs, LongBuffer rhs) {
                return Ordering.natural().nullsFirst().compare(lhs, rhs);
            }

            @Override
            public int sizeOf(int count) {
                return count * Longs.BYTES;
            }

            @Override
            public LongBuffer combine(ByteBuffer into, LongBuffer from) {
                return into.asLongBuffer().put(from);
            }
        }, compression, sizePer);
    }
}