org.eclipse.emf.edit.ui.dnd
Class LocalTransfer

java.lang.Object
  org.eclipse.swt.dnd.Transfer
      org.eclipse.swt.dnd.ByteArrayTransfer
          org.eclipse.emf.edit.ui.dnd.LocalTransfer

public class LocalTransfer
extends ByteArrayTransfer

This derived implementation of a byte array transfer short circuits the transfer process so that a local transfer does not serialize the object and hence can and will return the original object, not just a clone. You only really need ever know about LocalTransfer.getInstance(), so that you can include it in when adding drag support to a viewer. See EditingDomainViewerDropAdapter and ViewerDragAdapter for more details.

As an added guard, the time is recorded and serialized in javaToNative to that native to java can ensure that it's returns the value that was really to have been transferred.

Field Summary

protected static LocalTransfer	instance This is initialized and returned by getInstance().
protected java.lang.Object	object This records the data being transferred.
protected long	startTime This records the time at which the transfer data was recorded.
protected static int	TYPE_ID This is the ID that is registered to the name.
protected static java.lang.String	TYPE_NAME This is the register transfer type name.

Constructor Summary

protected

LocalTransfer() This creates an instance; typically you get one from getInstance().

Method Summary

static LocalTransfer	getInstance() This returns the one instance of this transfer agent.
protected int[]	getTypeIds() This returns the transfer IDs that this agent supports.
java.lang.String[]	getTypeNames() This returns the transfer names that this agent supports.
void	javaToNative(java.lang.Object object, TransferData transferData) This records the object and current time and encodes only the current time into the transfer data.
java.lang.Object	nativeToJava(TransferData transferData) This decodes the time of the transfer and returns the recorded the object if the recorded time and the decoded time match.

Methods inherited from class org.eclipse.swt.dnd.ByteArrayTransfer

getSupportedTypes, isSupportedType

Methods inherited from class org.eclipse.swt.dnd.Transfer

registerType, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

TYPE_NAME

protected static final java.lang.String TYPE_NAME

This is the register transfer type name.

See Also:

Constant Field Values

TYPE_ID

protected static final int TYPE_ID

This is the ID that is registered to the name.

instance

protected static LocalTransfer instance

This is initialized and returned by getInstance().

startTime

protected long startTime

This records the time at which the transfer data was recorded.

object

protected java.lang.Object object

This records the data being transferred.

Constructor Detail

LocalTransfer

protected LocalTransfer()

This creates an instance; typically you get one from getInstance().

Method Detail

getInstance

public static LocalTransfer getInstance()

This returns the one instance of this transfer agent.

getTypeIds

protected int[] getTypeIds()

This returns the transfer IDs that this agent supports.

Specified by:

getTypeIds in class Transfer

getTypeNames

public java.lang.String[] getTypeNames()

This returns the transfer names that this agent supports.

Specified by:

getTypeNames in class Transfer

javaToNative

public void javaToNative(java.lang.Object object,
                         TransferData transferData)

This records the object and current time and encodes only the current time into the transfer data.

Overrides:

javaToNative in class ByteArrayTransfer

nativeToJava

public java.lang.Object nativeToJava(TransferData transferData)

This decodes the time of the transfer and returns the recorded the object if the recorded time and the decoded time match.

Overrides:

nativeToJava in class ByteArrayTransfer