The class ByteArrayTransfer provides a platform specific mechanism for converting a java byte[] to a platform specific representation of the byte array and vice versa.

ByteArrayTransfer is never used directly but is sub-classed by transfer agents that convert between data in a java format such as a String and a platform specific byte array.

If the data you are converting does not map to a byte[], you should sub-class Transfer directly and do your own mapping to a platform data type.

The following snippet shows a subclass of ByteArrayTransfer that transfers data defined by the class MyType.

 public class MyType {
	public String fileName;
	public long fileLength;
	public long lastModified;
 }
 

 public class MyTypeTransfer extends ByteArrayTransfer {

	private static final String MYTYPENAME = "my_type_name";
	private static final int MYTYPEID = registerType(MYTYPENAME);
	private static MyTypeTransfer _instance = new MyTypeTransfer();

 private MyTypeTransfer() {}

 public static MyTypeTransfer getInstance () {
 	return _instance;
 }
 public void javaToNative (Object object, TransferData transferData) {
 	if (object == null || !(object instanceof MyType[])) return;

 	if (isSupportedType(transferData)) {
 		MyType[] myTypes = (MyType[]) object;
 		try {
 			// write data to a byte array and then ask super to convert to pMedium
 			ByteArrayOutputStream out = new ByteArrayOutputStream();
 			DataOutputStream writeOut = new DataOutputStream(out);
 			for (int i = 0, length = myTypes.length; i < length;  i++){
 				byte[] buffer = myTypes[i].fileName.getBytes();
 				writeOut.writeInt(buffer.length);
 				writeOut.write(buffer);
 				writeOut.writeLong(myTypes[i].fileLength);
 				writeOut.writeLong(myTypes[i].lastModified);
 			}
 			byte[] buffer = out.toByteArray();
 			writeOut.close();

 			super.javaToNative(buffer, transferData);

 		} catch (IOException e) {
 		}
 	}
 }
 public Object nativeToJava(TransferData transferData){

 	if (isSupportedType(transferData)) {

 		byte[] buffer = (byte[])super.nativeToJava(transferData);
 		if (buffer == null) return null;

 		MyType[] myData = new MyType[0];
 		try {
 			ByteArrayInputStream in = new ByteArrayInputStream(buffer);
 			DataInputStream readIn = new DataInputStream(in);
 			while(readIn.available() > 20) {
 				MyType datum = new MyType();
 				int size = readIn.readInt();
 				byte[] name = new byte[size];
 				readIn.read(name);
 				datum.fileName = new String(name);
 				datum.fileLength = readIn.readLong();
 				datum.lastModified = readIn.readLong();
 				MyType[] newMyData = new MyType[myData.length + 1];
 				System.arraycopy(myData, 0, newMyData, 0, myData.length);
 				newMyData[myData.length] = datum;
 				myData = newMyData;
 			}
 			readIn.close();
 		} catch (IOException ex) {
 			return null;
 		}
 		return myData;
 	}

 	return null;
 }
 protected String[] getTypeNames(){
 	return new String[]{MYTYPENAME};
 }
 protected int[] getTypeIds(){
 	return new int[] {MYTYPEID};
 }
 }