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Jedis is a blazingly small and sane Redis java client. This is a fork of master
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package redis.clients.jedis.util;

import java.io.Serializable;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class JedisByteHashMap implements Map, Cloneable, Serializable {
  private static final long serialVersionUID = -6971431362627219416L;
  private transient Map internalMap = new HashMap();

  @Override
  public void clear() {
    internalMap.clear();
  }

  @Override
  public boolean containsKey(Object key) {
    if (key instanceof byte[]) return internalMap.containsKey(new ByteArrayWrapper((byte[]) key));
    return internalMap.containsKey(key);
  }

  @Override
  public boolean containsValue(Object value) {
    return internalMap.containsValue(value);
  }

  @Override
  public Set> entrySet() {
    Iterator> iterator = internalMap.entrySet()
        .iterator();
    HashSet> hashSet = new HashSet>();
    while (iterator.hasNext()) {
      Entry entry = iterator.next();
      hashSet.add(new JedisByteEntry(entry.getKey().data, entry.getValue()));
    }
    return hashSet;
  }

  @Override
  public byte[] get(Object key) {
    if (key instanceof byte[]) return internalMap.get(new ByteArrayWrapper((byte[]) key));
    return internalMap.get(key);
  }

  @Override
  public boolean isEmpty() {
    return internalMap.isEmpty();
  }

  @Override
  public Set keySet() {
    Set keySet = new HashSet();
    Iterator iterator = internalMap.keySet().iterator();
    while (iterator.hasNext()) {
      keySet.add(iterator.next().data);
    }
    return keySet;
  }

  @Override
  public byte[] put(byte[] key, byte[] value) {
    return internalMap.put(new ByteArrayWrapper(key), value);
  }

  @Override
  @SuppressWarnings("unchecked")
  public void putAll(Map m) {
    Iterator iterator = m.entrySet().iterator();
    while (iterator.hasNext()) {
      Entry next = (Entry) iterator
          .next();
      internalMap.put(new ByteArrayWrapper(next.getKey()), next.getValue());
    }
  }

  @Override
  public byte[] remove(Object key) {
    if (key instanceof byte[]) return internalMap.remove(new ByteArrayWrapper((byte[]) key));
    return internalMap.remove(key);
  }

  @Override
  public int size() {
    return internalMap.size();
  }

  @Override
  public Collection values() {
    return internalMap.values();
  }

  private static final class ByteArrayWrapper {
    private final byte[] data;

    public ByteArrayWrapper(byte[] data) {
      if (data == null) {
        throw new NullPointerException();
      }
      this.data = data;
    }

    @Override
    public boolean equals(Object other) {
      if (!(other instanceof ByteArrayWrapper)) {
        return false;
      }
      return Arrays.equals(data, ((ByteArrayWrapper) other).data);
    }

    @Override
    public int hashCode() {
      return Arrays.hashCode(data);
    }
  }

  private static final class JedisByteEntry implements Entry {
    private byte[] value;
    private byte[] key;

    public JedisByteEntry(byte[] key, byte[] value) {
      this.key = key;
      this.value = value;
    }

    @Override
    public byte[] getKey() {
      return this.key;
    }

    @Override
    public byte[] getValue() {
      return this.value;
    }

    @Override
    public byte[] setValue(byte[] value) {
      this.value = value;
      return value;
    }

  }
}