ByteUtils.java

package org.opendedup.util;

import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Iterator;

public class ByteUtils {
	
	public static byte [] serializeHashMap(HashMap<String,String> map) {
		StringBuffer keys = new StringBuffer();
		Iterator<String> iter = map.keySet().iterator();
		while(iter.hasNext()) {
			String key = iter.next();
			keys.append(key);
			if(iter.hasNext())
				keys.append(",");
		}
		StringBuffer values = new StringBuffer();
		iter = map.values().iterator();
		while(iter.hasNext()) {
			String key = iter.next();
			values.append(key);
			if(iter.hasNext())
				values.append(",");
		}
		byte [] kb = keys.toString().getBytes();
		byte [] vb = values.toString().getBytes();
		byte [] out = new byte[kb.length + vb.length + 8];
		ByteBuffer buf = ByteBuffer.wrap(out);
		buf.putInt(kb.length);
		buf.put(kb);
		buf.putInt(vb.length);
		buf.put(vb);
		return buf.array();
	}
	
	public static HashMap<String,String> deSerializeHashMap(byte [] b) {
		ByteBuffer buf = ByteBuffer.wrap(b);
		byte [] kb = new byte[buf.getInt()];
		buf.get(kb);
		byte [] vb = new byte[buf.getInt()];
		buf.get(vb);
		String [] keys = new String(kb).split(",");
		String [] values = new String(vb).split(",");
		HashMap<String,String> map = new HashMap<String,String>();
		for(int i = 0;i< keys.length;i++) {
			map.put(keys[i], values[i]);
		}
		return map;
	}

}