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MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap memory. It is a fast, scalable and easy to use embedded Java database.

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package org.mapdb.serializer;

import org.mapdb.DataInput2;
import org.mapdb.DataOutput2;

import java.io.IOException;
import java.util.Comparator;

/**
 * Created by jan on 2/28/16.
 */
public class SerializerLongPacked extends SerializerLong {
    @Override
    public void serialize(DataOutput2 out, Long value) throws IOException {
        out.packLong(value);
    }

    @Override
    public Long deserialize(DataInput2 in, int available) throws IOException {
        return new Long(in.unpackLong());
    }

    @Override
    public void valueArraySerialize(DataOutput2 out, Object vals) throws IOException {
        for (long o : (long[])vals) {
            out.packLong(o);
        }
    }

    @Override
    public long[] valueArrayDeserialize(DataInput2 in, int size) throws IOException {
        long[] ret = new long[size];
        in.unpackLongArray(ret, 0, size);
        return ret;
    }

    @Override
    public int fixedSize() {
        return -1;
    }

    @Override
    public int valueArrayBinarySearch(Long key, DataInput2 input, int keysLen, Comparator comparator) throws IOException {
        if (comparator != this)
            return super.valueArrayBinarySearch(key, input, keysLen, comparator);
        long key2 = key;
        for (int pos = 0; pos < keysLen; pos++) {
            long from = input.unpackLong();

            if (key2 <= from) {
                input.unpackLongSkip(keysLen - pos - 1);
                return (key2 == from) ? pos : -(pos + 1);
            }
        }

        //not found
        return -(keysLen + 1);
    }

    @Override
    public Long valueArrayBinaryGet(DataInput2 input, int keysLen, int pos) throws IOException {
        input.unpackLongSkip(pos);
        return input.unpackLong();
    }



}