Module java.datatransfer

Package java.awt.datatransfer

Class Clipboard

java.lang.Object

java.awt.datatransfer.Clipboard

public class Clipboard
extends Object

A class that implements a mechanism to transfer data using cut/copy/paste operations.

FlavorListeners may be registered on an instance of the Clipboard class to be notified about changes to the set of DataFlavors available on this clipboard (see addFlavorListener(java.awt.datatransfer.FlavorListener)).

Since:

1.1

See Also:

Toolkit.getSystemClipboard(), Toolkit.getSystemSelection()

Field Summary

Fields

Modifier and Type	Field	Description
protected Transferable	contents	Contents of the clipboard.
protected ClipboardOwner	owner	The owner of the clipboard.

Constructor Summary

Constructors

Constructor	Description
Clipboard(String name)	Creates a clipboard object.

Method Summary

Modifier and Type	Method	Description
void	addFlavorListener(FlavorListener listener)	Registers the specified FlavorListener to receive FlavorEvents from this clipboard.
DataFlavor[]	getAvailableDataFlavors()	Returns an array of DataFlavors in which the current contents of this clipboard can be provided.
Transferable	getContents(Object requestor)	Returns a transferable object representing the current contents of the clipboard.
Object	getData(DataFlavor flavor)	Returns an object representing the current contents of this clipboard in the specified DataFlavor.
FlavorListener[]	getFlavorListeners()	Returns an array of all the FlavorListeners currently registered on this Clipboard.
String	getName()	Returns the name of this clipboard object.
boolean	isDataFlavorAvailable(DataFlavor flavor)	Returns whether or not the current contents of this clipboard can be provided in the specified DataFlavor.
void	removeFlavorListener(FlavorListener listener)	Removes the specified FlavorListener so that it no longer receives FlavorEvents from this Clipboard.
void	setContents(Transferable contents, ClipboardOwner owner)	Sets the current contents of the clipboard to the specified transferable object and registers the specified clipboard owner as the owner of the new contents.

Methods inherited from class java.lang.Object

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

Field Detail

owner

protected ClipboardOwner owner

The owner of the clipboard.

contents

protected Transferable contents

Contents of the clipboard.

Constructor Detail

Clipboard

public Clipboard(String name)

Creates a clipboard object.

Parameters:

name - for the clipboard

See Also:

Toolkit.getSystemClipboard()

Method Detail

getName

public String getName()

Returns the name of this clipboard object.

Returns:

the name of this clipboard object

See Also:

Toolkit.getSystemClipboard()

setContents

public void setContents(Transferable contents,
                        ClipboardOwner owner)

Sets the current contents of the clipboard to the specified transferable object and registers the specified clipboard owner as the owner of the new contents.

If there is an existing owner different from the argument owner, that owner is notified that it no longer holds ownership of the clipboard contents via an invocation of ClipboardOwner.lostOwnership() on that owner. An implementation of setContents() is free not to invoke lostOwnership() directly from this method. For example, lostOwnership() may be invoked later on a different thread. The same applies to FlavorListeners registered on this clipboard.

The method throws IllegalStateException if the clipboard is currently unavailable. For example, on some platforms, the system clipboard is unavailable while it is accessed by another application.

Parameters:

contents - the transferable object representing the clipboard content

owner - the object which owns the clipboard content

Throws:

IllegalStateException - if the clipboard is currently unavailable

See Also:

Toolkit.getSystemClipboard()

getContents

public Transferable getContents(Object requestor)

Returns a transferable object representing the current contents of the clipboard. If the clipboard currently has no contents, it returns null. The parameter Object requestor is not currently used. The method throws IllegalStateException if the clipboard is currently unavailable. For example, on some platforms, the system clipboard is unavailable while it is accessed by another application.

Parameters:

requestor - the object requesting the clip data (not used)

Returns:

the current transferable object on the clipboard

Throws:

IllegalStateException - if the clipboard is currently unavailable

See Also:

Toolkit.getSystemClipboard()

getAvailableDataFlavors

public DataFlavor[] getAvailableDataFlavors()

Returns an array of DataFlavors in which the current contents of this clipboard can be provided. If there are no DataFlavors available, this method returns a zero-length array.

Returns:

an array of DataFlavors in which the current contents of this clipboard can be provided

Throws:

IllegalStateException - if this clipboard is currently unavailable

Since:

1.5

isDataFlavorAvailable

public boolean isDataFlavorAvailable(DataFlavor flavor)

Returns whether or not the current contents of this clipboard can be provided in the specified DataFlavor.

Parameters:

flavor - the requested DataFlavor for the contents

Returns:

true if the current contents of this clipboard can be provided in the specified DataFlavor; false otherwise

Throws:

NullPointerException - if flavor is null

IllegalStateException - if this clipboard is currently unavailable

Since:

1.5

getData

public Object getData(DataFlavor flavor)
               throws UnsupportedFlavorException,
                      IOException

Returns an object representing the current contents of this clipboard in the specified DataFlavor. The class of the object returned is defined by the representation class of flavor.

Parameters:

flavor - the requested DataFlavor for the contents

Returns:

an object representing the current contents of this clipboard in the specified DataFlavor

Throws:

NullPointerException - if flavor is null

IllegalStateException - if this clipboard is currently unavailable

UnsupportedFlavorException - if the requested DataFlavor is not available

IOException - if the data in the requested DataFlavor can not be retrieved

Since:

1.5

See Also:

DataFlavor.getRepresentationClass()

addFlavorListener

public void addFlavorListener(FlavorListener listener)

Registers the specified FlavorListener to receive FlavorEvents from this clipboard. If listener is null, no exception is thrown and no action is performed.

Parameters:

listener - the listener to be added

Since:

1.5

See Also:

removeFlavorListener(java.awt.datatransfer.FlavorListener), getFlavorListeners(), FlavorListener, FlavorEvent

removeFlavorListener

public void removeFlavorListener(FlavorListener listener)

Removes the specified FlavorListener so that it no longer receives FlavorEvents from this Clipboard. This method performs no function, nor does it throw an exception, if the listener specified by the argument was not previously added to this Clipboard. If listener is null, no exception is thrown and no action is performed.

Parameters:

listener - the listener to be removed

Since:

1.5

See Also:

addFlavorListener(java.awt.datatransfer.FlavorListener), getFlavorListeners(), FlavorListener, FlavorEvent

getFlavorListeners

public FlavorListener[] getFlavorListeners()

Returns an array of all the FlavorListeners currently registered on this Clipboard.

Returns:

all of this clipboard's FlavorListeners or an empty array if no listeners are currently registered

Since:

1.5

See Also:

addFlavorListener(java.awt.datatransfer.FlavorListener), removeFlavorListener(java.awt.datatransfer.FlavorListener), FlavorListener, FlavorEvent