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java.lang.Object org.eclipse.swt.dnd.Transfer org.eclipse.swt.dnd.ByteArrayTransfer
public abstract class ByteArrayTransfer
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};
}
}
Transfer
Constructor Summary | |
---|---|
ByteArrayTransfer()
|
Method Summary | |
---|---|
TransferData[] |
getSupportedTypes()
Returns a list of the platform specific data types that can be converted using this transfer agent. |
boolean |
isSupportedType(TransferData transferData)
Returns true if the TransferData data type can be converted
using this transfer agent, or false otherwise (including if transferData is
null ). |
void |
javaToNative(java.lang.Object object,
TransferData transferData)
This implementation of javaToNative converts a java
byte[] to a platform specific representation. |
java.lang.Object |
nativeToJava(TransferData transferData)
This implementation of nativeToJava converts a platform
specific representation of a byte array to a java byte[] . |
Methods inherited from class org.eclipse.swt.dnd.Transfer |
---|
getTypeIds, getTypeNames, registerType, validate |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
---|
public ByteArrayTransfer()
Method Detail |
---|
public TransferData[] getSupportedTypes()
Transfer
Only the data type fields of the TransferData
objects are
filled in.
getSupportedTypes
in class Transfer
public boolean isSupportedType(TransferData transferData)
Transfer
TransferData
data type can be converted
using this transfer agent, or false otherwise (including if transferData is
null
).
isSupportedType
in class Transfer
transferData
- a platform specific description of a data type; only
the data type fields of the TransferData
object need
to be filled in
public void javaToNative(java.lang.Object object, TransferData transferData)
javaToNative
converts a java
byte[]
to a platform specific representation.
javaToNative
in class Transfer
object
- a java byte[]
containing the data to be
convertedtransferData
- an empty TransferData
object that will be
filled in on return with the platform specific format of the dataTransfer.nativeToJava(org.eclipse.swt.dnd.TransferData)
public java.lang.Object nativeToJava(TransferData transferData)
nativeToJava
converts a platform
specific representation of a byte array to a java byte[]
.
nativeToJava
in class Transfer
transferData
- the platform specific representation of the data to be
converted
byte[]
containing the converted data if the
conversion was successful; otherwise nullTransfer.javaToNative(java.lang.Object, org.eclipse.swt.dnd.TransferData)
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Copyright (c) EclipseSource and others 2002, 2013. All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0