This implementation of <code>javaToNative</code> converts a java <code>byte[]</code> to a platform specific representation.
This implementation of <code>nativeToJava</code> converts a platform specific representation of a byte array to a java <code>byte[]</code>.
Returns a list of the platform specific data types that can be converted using this transfer agent.
Returns true if the <code>TransferData</code> data type can be converted using this transfer agent, or false otherwise (including if transferData is <code>null</code>).
Returns the platform specific names of the data types that can be converted using this transfer agent.
Returns the platform specific ids of the data types that can be converted using this transfer agent.
Converts a java representation of data to a platform specific representation of the data.
Converts a platform specific representation of data to a java representation.
Registers a name for a data type and returns the associated unique identifier.
Test that the object is of the correct format for this Transfer class.
The class <code>ByteArrayTransfer</code> provides a platform specific mechanism for converting a java <code>byte[]</code> to a platform specific representation of the byte array and vice versa.
<p><code>ByteArrayTransfer</code> is never used directly but is sub-classed by transfer agents that convert between data in a java format such as a <code>String</code> and a platform specific byte array.
<p>If the data you are converting <b>does not</b> map to a <code>byte[]</code>, you should sub-class <code>Transfer</code> directly and do your own mapping to a platform data type.</p>
<p>The following snippet shows a subclass of ByteArrayTransfer that transfers data defined by the class <code>MyType</code>.</p>
<pre><code> public class MyType { public String fileName; public long fileLength; public long lastModified; } </code></pre>
<pre><code> 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 is 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 = myTypesi.fileName.getBytes(); writeOut.writeInt(buffer.length); writeOut.write(buffer); writeOut.writeLong(myTypesi.fileLength); writeOut.writeLong(myTypesi.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 is 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 bytesize; 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); newMyDatamyData.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}; } } </code></pre>
@see Transfer