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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 org.mapdb.Serializer;

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

public class SerializerString implements GroupSerializer {

    @Override
    public void serialize(DataOutput2 out, String value) throws IOException {
        out.writeUTF(value);
    }

    @Override
    public String deserialize(DataInput2 in, int available) throws IOException {
        return in.readUTF();
    }

    @Override
    public boolean isTrusted() {
        return true;
    }


    @Override
    public void valueArraySerialize(DataOutput2 out2, Object vals) throws IOException {
        for(char[] v:(char[][])vals){
            out2.packInt(v.length);
            for(char c:v){
                out2.packInt(c);
            }
        }
    }

    @Override
    public char[][] valueArrayDeserialize(DataInput2 in2, int size) throws IOException {
        char[][] ret = new char[size][];
        for(int i=0;i>> 1;
            int compare = comparator.compare(key, new String(array[mid]));

            if (compare == 0)
                return mid;
            else if (compare < 0)
                hi = mid - 1;
            else
                lo = mid + 1;
        }
        return -(lo + 1);
    }

    @Override
    public String valueArrayGet(Object vals, int pos) {
        return new String(((char[][])vals)[pos]);
    }

    @Override
    public int valueArraySize(Object vals) {
        return ((char[][])vals).length;
    }

    @Override
    public char[][] valueArrayEmpty() {
        return new char[0][];
    }

    @Override
    public char[][] valueArrayPut(Object vals, int pos, String newValue) {
        char[][] array = (char[][]) vals;
        final char[][] ret = Arrays.copyOf(array, array.length+1);
        if(pos