Appending another byte array to the same record in a record store

[cryptyritu]

Hi,
I want to append a byte array in a previously created record in a record store. Eg: I have a string "Nokia" in a record in a recordstore. I want to add "Forum" in it, to make it "NokiaForum". I tried using recordStore.setRecord(iD, byte[], offset); but it always overwrited the record.

Then I used this method :

public static void setRecord(int id, String dataToAppend, int offset){
        try {
            byte[] outputRecord;
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            DataOutputStream outputDataStream = new DataOutputStream(outputStream);

                outputDataStream.writeUTF(replacement);
                outputDataStream.flush();
                outputRecord = outputStream.toByteArray();
                if(recordStore.getNumRecords()>0){
                    int ar = recordStore.getRecord(1, outputRecord, outputRecord.length);
                    System.out.println("number of bytes added"+ar);
            }
                recordStore.setRecord(1, outputRecord, 0, outputRecord.length);
            outputStream.reset();
            outputStream.close();
            outputDataStream.close();
        } catch (Exception error) {
            error.printStackTrace();
        }
    }

But this gives array index out of bounds exception. Please someone provide some code to achieve this.

Thanks,

[njzk2]

read again the getRecord method documentation.
what is replacement ?

what you want to do is basically :
open the record store, fetch your record, measure the length of it, measure the length of the data to append, create a new byte array long enougth to store both, copy your record at the begining, copy your new data after, set the record, close the record store.

[Mmusehani]

public void setRecord(RecordStore rs, int id, String dataToAppend) throws Exception
	{
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		byte[] data = rs.getRecord(id);

		baos.write(data);
		baos.write(dataToAppend.getBytes());
		data = baos.toByteArray();

		rs.setRecord(id, data, 0, data.length);
	}