Mapping byte stream to Java object

[Ahmed Basheer]

If I need to split the byte array and populate data fields of the Java object what is efficient way of doing the same. Walking through the byte array seems like easier way but may not be efficient. Any ideas would be appreciated.

Thanks,
Basheer

[Stan James]

I think we'll need a bit more detail. Can you show a SHORT bit of code around the problem, maybe what input and output you expect?

[Ahmed Basheer]

Here is the example:

let me populate bytearray;
byte bytebuffer[] = new byte[3];
bytebuffer[0]=0x11;
bytebuffer[1]=0xA3;
bytebuffer[2]=0x11;
bytebuffer[3]=0xF3;

This byte array is populated in such a way that first byte and first 4 bits in the 2nd byte contain "id1". lower 4 bits in 2nd byte contain "id2" and third byte contains "id3" and fourth byte contains "id4".

The Java object that should be mapped is like this

// The ExampleObject is like a java bean and byte array should map to this java bean.

ExampleObject {

private short id1;

private byte id2;

private byte id3;

private byte id4;

public setId1(short id1) { this.id1=id1}
...
public short getId1( return id1; }

...

}

I know the byte array and I know the name of the fields and I know the java object, need to figure out the best way to map. Some fields as you can see id1 could not be byte aligned. I can walk through the byte array but is there any other way.

In c++ you can cast struct to the byte stream and you have access to the data fields of structs. Does java offer any convinient way?

Thanks,
Basheer