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.

`FlavorListener`s may be registered on an instance of the Clipboard class to be notified about changes to the set of `DataFlavor`s 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 `FlavorEvent`s from this clipboard.
  `DataFlavor[]`
  `getAvailableDataFlavors()`
  Returns an array of `DataFlavor`s 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 `FlavorListener`s 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 `FlavorEvent`s 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 declared in class java.lang.Object

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

- ## Field Details

  - ### owner

    protected ClipboardOwner owner
    The owner of the clipboard.

  - ### contents

    protected Transferable contents
    Contents of the clipboard.

- ## Constructor Details

  - ### Clipboard

    public Clipboard(String name)
    Creates a clipboard object.
    Parameters:
      `name` - for the clipboard
    See Also:
      - `Toolkit.getSystemClipboard()`

- ## Method Details

  - ### 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 `FlavorListener`s 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 `DataFlavor`s in which the current contents of this clipboard can be provided. If there are no `DataFlavor`s available, this method returns a zero-length array.
    Returns:
      an array of `DataFlavor`s 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 `FlavorEvent`s 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 `FlavorEvent`s 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 `FlavorListener`s currently registered on this `Clipboard`.
    Returns:
      all of this clipboard's `FlavorListener`s 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`