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zeromq POJO implementation
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/*
    Copyright (c) 2010 250bpm s.r.o.
    Copyright (c) 2010-2011 Other contributors as noted in the AUTHORS file

    This file is part of 0MQ.

    0MQ is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    0MQ is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see .
*/
package zmq;

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

public class Blob {

    private byte[] buf;
    private int hash = 0;
    
    public Blob(byte[] data_) {
        buf = Arrays.copyOf(data_, data_.length);
    }
    
    public Blob(int size) {
       buf = new byte[size];
    }
    
    public Blob(ByteBuffer buf_) {
       buf = Utils.bytes(buf_);
    }

    public Blob put(int pos, byte b) {
        buf[pos] = b;
        hash = 0;
        return this;
    }
    
    public Blob put(int pos, byte[] data) {
        System.arraycopy(data, 0, buf, pos, data.length);
        hash = 0;
        return this;
    }

    public int size() {
        return buf.length;
    }

    public byte[] data() {
        return buf;
    }
    
    @Override
    public boolean equals(Object t) {

        if (t instanceof Blob)
            return Arrays.equals(buf, ((Blob)t).buf);
        return false;
    }
    
    @Override
    public int hashCode() {
        if (hash == 0) {
            for (byte b: buf) {
                hash = 31 * hash + b;
            }
        }
        return hash;
    }
}