Key-value message class in Java

package guide;

import java.nio.ByteBuffer;
import java.util.Arrays;

import org.zeromq.ZMQ;
import org.zeromq.ZMQ.Socket;

/**
*
* A simple getKey value message class
* @author Danish Shrestha <moc.liamg|60ahtserhsd#moc.liamg|60ahtserhsd>
*
*/

public class kvsimple
{
private final String key;
private long sequence;
private final byte[] body;

public kvsimple(String key, long sequence, byte[] body)
{
this.key = key;
this.sequence = sequence;
this.body = body; // clone if needed
}

public String getKey()
{
return key;
}

public long getSequence()
{
return sequence;
}

public void setSequence(long sequence)
{
this.sequence = sequence;
}

public byte[] getBody()
{
return body;
}

public void send(Socket publisher)
{

publisher.send(key.getBytes(ZMQ.CHARSET), ZMQ.SNDMORE);

ByteBuffer bb = ByteBuffer.allocate(8);
bb.asLongBuffer().put(sequence);
publisher.send(bb.array(), ZMQ.SNDMORE);

publisher.send(body, 0);
}

public static kvsimple recv(Socket updates)
{
byte[] data = updates.recv(0);
if (data == null || !updates.hasReceiveMore())
return null;
String key = new String(data, ZMQ.CHARSET);
data = updates.recv(0);
if (data == null || !updates.hasReceiveMore())
return null;
Long sequence = ByteBuffer.wrap(data).getLong();
byte[] body = updates.recv(0);
if (body == null || updates.hasReceiveMore())
return null;

return new kvsimple(key, sequence, body);
}

@Override
public String toString()
{
return "kvsimple [getKey=" + key + ", getSequence=" + sequence + ", body=" + Arrays.toString(body) + "]";
}

@Override
public int hashCode()
{
final int prime = 31;
int result = 1;
result = prime * result + Arrays.hashCode(body);
result = prime * result + ((key == null) ? 0 : key.hashCode());
result = prime * result + (int) (sequence ^ (sequence >>> 32));
return result;
}

@Override
public boolean equals(Object obj)
{
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
kvsimple other = (kvsimple) obj;
if (!Arrays.equals(body, other.body))
return false;
if (key == null) {
if (other.key != null)
return false;
}
else if (!key.equals(other.key))
return false;
if (sequence != other.sequence)
return false;
return true;
}

}