protectedonescomp.java

real-time design patterns in Real-time java

package designPatterns;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.io.StreamCorruptedException;


public class ProtectedOnesComp {
	private byte[] bytearr;
	private byte[] onescompl;

	public void storeObj(Serializable object) throws IOException {
		// Serialize to a byte array
		ObjectOutput out;
		ByteArrayOutputStream bos = new ByteArrayOutputStream() ;

		out = new ObjectOutputStream(bos) ;
		out.writeObject(object);
		out.close();
		bytearr = bos.toByteArray();
		onesComp();
	}

	public Serializable getObj() throws StreamCorruptedException, IOException, ClassNotFoundException {
		// Deserialize from a byte array
		ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(bytearr));
        Serializable obj = (Serializable) in.readObject();
        in.close();
        return obj;
	}
	
	public boolean check() {
		boolean result = true;
		for (int i = 0; i < bytearr.length; i++) {
			if (onescompl[i] != (byte)~bytearr[i]) {
				result = false;
				break;
			}
		}
		return result;
	}

	private void onesComp() {
		onescompl = new byte[bytearr.length];
		for (int i = 0; i < bytearr.length; i++) {
			onescompl[i] = (byte)~bytearr[i];
		}
	}
}