package forkk.multimc.data;
import java.awt.Point;
import java.awt.datatransfer.DataFlavor;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.PrintStream;
import java.io.Reader;
import java.util.Iterator;
import java.util.List;
/**
* This class makes it easy to drag and drop files from the operating system to
* a Java program. Any <tt>java.awt.Component</tt> can be dropped onto, but only
* <tt>javax.swing.JComponent</tt>s will indicate the drop event with a changed
* border.
* <p/>
* To use this class, construct a new <tt>FileDrop</tt> by passing it the target
* component and a <tt>Listener</tt> to receive notification when file(s) have
* been dropped. Here is an example:
* <p/>
* <code><pre>
* JPanel myPanel = new JPanel();
* new FileDrop( myPanel, new FileDrop.Listener()
* { public void filesDropped( java.io.File[] files )
* {
* // handle file drop
* ...
* } // end filesDropped
* }); // end FileDrop.Listener
* </pre></code>
* <p/>
* You can specify the border that will appear when files are being dragged by
* calling the constructor with a <tt>javax.swing.border.Border</tt>. Only
* <tt>JComponent</tt>s will show any indication with a border.
* <p/>
* You can turn on some debugging features by passing a <tt>PrintStream</tt>
* object (such as <tt>System.out</tt>) into the full constructor. A
* <tt>null</tt> value will result in no extra debugging information being
* output.
* <p/>
*
* <p>
* I'm releasing this code into the Public Domain. Enjoy.
* </p>
* <p>
* <em>Original author: Robert Harder, rharder@usa.net</em>
* </p>
* <p>
* 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added.
* </p>
*
* @author Robert Harder
* @author rharder@users.sf.net
* @version 1.0.1
*/
public class FileDrop
{
private transient javax.swing.border.Border normalBorder;
private transient java.awt.dnd.DropTargetListener dropListener;
/** Discover if the running JVM is modern enough to have drag and drop. */
private static Boolean supportsDnD;
// Default border color
private static java.awt.Color defaultBorderColor = new java.awt.Color(0f,
0f, 1f, 0.25f);
/**
* Constructs a {@link FileDrop} with a default light-blue border and, if
* <var>c</var> is a {@link java.awt.Container}, recursively sets all
* elements contained within as drop targets, though only the top level
* container will change borders.
*
* @param c
* Component on which files will be dropped.
* @param listener
* Listens for <tt>filesDropped</tt>.
* @since 1.0
*/
public FileDrop(final java.awt.Component c, final Listener listener)
{
this(null, // Logging stream
c, // Drop target
javax.swing.BorderFactory.createMatteBorder(2, 2, 2, 2,
defaultBorderColor), // Drag border
true, // Recursive
listener);
} // end constructor
/**
* Constructor with a default border and the option to recursively set drop
* targets. If your component is a <tt>java.awt.Container</tt>, then each of
* its children components will also listen for drops, though only the
* parent will change borders.
*
* @param c
* Component on which files will be dropped.
* @param recursive
* Recursively set children as drop targets.
* @param listener
* Listens for <tt>filesDropped</tt>.
* @since 1.0
*/
public FileDrop(final java.awt.Component c, final boolean recursive,
final Listener listener)
{
this(null, // Logging stream
c, // Drop target
javax.swing.BorderFactory.createMatteBorder(2, 2, 2, 2,
defaultBorderColor), // Drag border
recursive, // Recursive
listener);
} // end constructor
/**
* Constructor with a default border and debugging optionally turned on.
* With Debugging turned on, more status messages will be displayed to
* <tt>out</tt>. A common way to use this constructor is with
* <tt>System.out</tt> or <tt>System.err</tt>. A <tt>null</tt> value for the
* parameter <tt>out</tt> will result in no debugging output.
*
* @param out
* PrintStream to record debugging info or null for no debugging.
* @param out
* @param c
* Component on which files will be dropped.
* @param listener
* Listens for <tt>filesDropped</tt>.
* @since 1.0
*/
public FileDrop(final java.io.PrintStream out, final java.awt.Component c,
final Listener listener)
{
this(out, // Logging stream
c, // Drop target
javax.swing.BorderFactory.createMatteBorder(2, 2, 2, 2,
defaultBorderColor), false, // Recursive
listener);
} // end constructor
/**
* Constructor with a default border, debugging optionally turned on and the
* option to recursively set drop targets. If your component is a
* <tt>java.awt.Container</tt>, then each of its children components will
* also listen for drops, though only the parent will change borders. With
* Debugging turned on, more status messages will be displayed to
* <tt>out</tt>. A common way to use this constructor is with
* <tt>System.out</tt> or <tt>System.err</tt>. A <tt>null</tt> value for the
* parameter <tt>out</tt> will result in no debugging output.
*
* @param out
* PrintStream to record debugging info or null for no debugging.
* @param out
* @param c
* Component on which files will be dropped.
* @param recursive
* Recursively set children as drop targets.
* @param listener
* Listens for <tt>filesDropped</tt>.
* @since 1.0
*/
public FileDrop(final java.io.PrintStream out, final java.awt.Component c,
final boolean recursive, final Listener listener)
{
this(out, // Logging stream
c, // Drop target
javax.swing.BorderFactory.createMatteBorder(2, 2, 2, 2,
defaultBorderColor), // Drag border
recursive, // Recursive
listener);
} // end constructor
/**
* Constructor with a specified border
*
* @param c
* Component on which files will be dropped.
* @param dragBorder
* Border to use on <tt>JComponent</tt> when dragging occurs.
* @param listener
* Listens for <tt>filesDropped</tt>.
* @since 1.0
*/
public FileDrop(final java.awt.Component c,
final javax.swing.border.Border dragBorder, final Listener listener)
{
this(null, // Logging stream
c, // Drop target
dragBorder, // Drag border
false, // Recursive
listener);
} // end constructor
/**
* Constructor with a specified border and the option to recursively set
* drop targets. If your component is a <tt>java.awt.Container</tt>, then
* each of its children components will also listen for drops, though only
* the parent will change borders.
*
* @param c
* Component on which files will be dropped.
* @param dragBorder
* Border to use on <tt>JComponent</tt> when dragging occurs.
* @param recursive
* Recursively set children as drop targets.
* @param listener
* Listens for <tt>filesDropped</tt>.
* @since 1.0
*/
public FileDrop(final java.awt.Component c,
final javax.swing.border.Border dragBorder,
final boolean recursive, final Listener listener)
{
this(null, c, dragBorder, recursive, listener);
} // end constructor
/**
* Constructor with a specified border and debugging optionally turned on.
* With Debugging turned on, more status messages will be displayed to
* <tt>out</tt>. A common way to use this constructor is with
* <tt>System.out</tt> or <tt>System.err</tt>. A <tt>null</tt> value for the
* parameter <tt>out</tt> will result in no debugging output.
*
* @param out
* PrintStream to record debugging info or null for no debugging.
* @param c
* Component on which files will be dropped.
* @param dragBorder
* Border to use on <tt>JComponent</tt> when dragging occurs.
* @param listener
* Listens for <tt>filesDropped</tt>.
* @since 1.0
*/
public FileDrop(final java.io.PrintStream out, final java.awt.Component c,
final javax.swing.border.Border dragBorder, final Listener listener)
{
this(out, // Logging stream
c, // Drop target
dragBorder, // Drag border
false, // Recursive
listener);
} // end constructor
/**
* Full constructor with a specified border and debugging optionally turned
* on. With Debugging turned on, more status messages will be displayed to
* <tt>out</tt>. A common way to use this constructor is with
* <tt>System.out</tt> or <tt>System.err</tt>. A <tt>null</tt> value for the
* parameter <tt>out</tt> will result in no debugging output.
*
* @param out
* PrintStream to record debugging info or null for no debugging.
* @param c
* Component on which files will be dropped.
* @param dragBorder
* Border to use on <tt>JComponent</tt> when dragging occurs.
* @param recursive
* Recursively set children as drop targets.
* @param listener
* Listens for <tt>filesDropped</tt>.
* @since 1.0
*/
public FileDrop(final java.io.PrintStream out, final java.awt.Component c,
final javax.swing.border.Border dragBorder,
final boolean recursive, final Listener listener)
{
if (supportsDnD())
{ // Make a drop listener
dropListener = new java.awt.dnd.DropTargetListener()
{
@Override
public void dragEnter(java.awt.dnd.DropTargetDragEvent evt)
{
log(out, "FileDrop: dragEnter event.");
// Is this an acceptable drag event?
if (isDragOk(out, evt))
{
// If it's a Swing component, set its border
if (c instanceof javax.swing.JComponent)
{
javax.swing.JComponent jc = (javax.swing.JComponent) c;
normalBorder = jc.getBorder();
log(out, "FileDrop: normal border saved.");
jc.setBorder(dragBorder);
log(out, "FileDrop: drag border set.");
} // end if: JComponent
// Acknowledge that it's okay to enter
// evt.acceptDrag(
// java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE );
evt.acceptDrag(java.awt.dnd.DnDConstants.ACTION_COPY);
log(out, "FileDrop: event accepted.");
} // end if: drag ok
else
{ // Reject the drag event
evt.rejectDrag();
log(out, "FileDrop: event rejected.");
} // end else: drag not ok
} // end dragEnter
@Override
public void dragOver(java.awt.dnd.DropTargetDragEvent evt)
{ // This is called continually as long as the mouse is
// over the drag target.
} // end dragOver
@Override
public void drop(java.awt.dnd.DropTargetDropEvent evt)
{
log(out, "FileDrop: drop event.");
try
{ // Get whatever was dropped
java.awt.datatransfer.Transferable tr = evt
.getTransferable();
// Is it a file list?
if (tr.isDataFlavorSupported(java.awt.datatransfer.DataFlavor.javaFileListFlavor))
{
// Say we'll take it.
// evt.acceptDrop (
// java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE );
evt.acceptDrop(java.awt.dnd.DnDConstants.ACTION_COPY);
log(out, "FileDrop: file list accepted.");
// Get a useful list
List<?> fileList = (java.util.List<?>) tr
.getTransferData(java.awt.datatransfer.DataFlavor.javaFileListFlavor);
@SuppressWarnings("unused")
Iterator<?> iterator = fileList.iterator();
// Convert list to array
java.io.File[] filesTemp = new java.io.File[fileList
.size()];
fileList.toArray(filesTemp);
final java.io.File[] files = filesTemp;
// Alert listener to drop.
if (listener != null)
listener.filesDropped(files, evt.getLocation());
// Mark that drop is completed.
evt.getDropTargetContext().dropComplete(true);
log(out, "FileDrop: drop complete.");
} // end if: file list
else
// this section will check for a reader flavor.
{
// Thanks, Nathan!
// BEGIN 2007-09-12 Nathan Blomquist -- Linux
// (KDE/Gnome) support added.
DataFlavor[] flavors = tr.getTransferDataFlavors();
boolean handled = false;
for (int zz = 0; zz < flavors.length; zz++)
{
if (flavors[zz].isRepresentationClassReader())
{
// Say we'll take it.
// evt.acceptDrop (
// java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE
// );
evt.acceptDrop(java.awt.dnd.DnDConstants.ACTION_COPY);
log(out, "FileDrop: reader accepted.");
Reader reader = flavors[zz]
.getReaderForText(tr);
BufferedReader br = new BufferedReader(
reader);
if (listener != null)
listener.filesDropped(createFileArray(
br, out), evt.getLocation());
// Mark that drop is completed.
evt.getDropTargetContext().dropComplete(
true);
log(out, "FileDrop: drop complete.");
handled = true;
break;
}
}
if (!handled)
{
log(out,
"FileDrop: not a file list or reader - abort.");
evt.rejectDrop();
}
// END 2007-09-12 Nathan Blomquist -- Linux
// (KDE/Gnome) support added.
} // end else: not a file list
} // end try
catch (java.io.IOException io)
{
log(out, "FileDrop: IOException - abort:");
io.printStackTrace(out);
evt.rejectDrop();
} // end catch IOException
catch (java.awt.datatransfer.UnsupportedFlavorException ufe)
{
log(out,
"FileDrop: UnsupportedFlavorException - abort:");
ufe.printStackTrace(out);
evt.rejectDrop();
} // end catch: UnsupportedFlavorException
finally
{
// If it's a Swing component, reset its border
if (c instanceof javax.swing.JComponent)
{
javax.swing.JComponent jc = (javax.swing.JComponent) c;
jc.setBorder(normalBorder);
log(out, "FileDrop: normal border restored.");
} // end if: JComponent
} // end finally
} // end drop
@Override
public void dragExit(java.awt.dnd.DropTargetEvent evt)
{
log(out, "FileDrop: dragExit event.");
// If it's a Swing component, reset its border
if (c instanceof javax.swing.JComponent)
{
javax.swing.JComponent jc = (javax.swing.JComponent) c;
jc.setBorder(normalBorder);
log(out, "FileDrop: normal border restored.");
} // end if: JComponent
} // end dragExit
@Override
public void dropActionChanged(
java.awt.dnd.DropTargetDragEvent evt)
{
log(out, "FileDrop: dropActionChanged event.");
// Is this an acceptable drag event?
if (isDragOk(out, evt))
{ // evt.acceptDrag(
// java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE );
evt.acceptDrag(java.awt.dnd.DnDConstants.ACTION_COPY);
log(out, "FileDrop: event accepted.");
} // end if: drag ok
else
{
evt.rejectDrag();
log(out, "FileDrop: event rejected.");
} // end else: drag not ok
} // end dropActionChanged
}; // end DropTargetListener
// Make the component (and possibly children) drop targets
makeDropTarget(out, c, recursive);
} // end if: supports dnd
else
{
log(out, "FileDrop: Drag and drop is not supported with this JVM");
} // end else: does not support DnD
} // end constructor
private static boolean supportsDnD()
{ // Static Boolean
if (supportsDnD == null)
{
boolean support = false;
try
{
@SuppressWarnings("unused")
Class<?> arbitraryDndClass = Class
.forName("java.awt.dnd.DnDConstants");
support = true;
} // end try
catch (Exception e)
{
support = false;
} // end catch
supportsDnD = new Boolean(support);
} // end if: first time through
return supportsDnD.booleanValue();
} // end supportsDnD
// BEGIN 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added.
private static String ZERO_CHAR_STRING = "" + (char) 0;
private static File[] createFileArray(BufferedReader bReader,
PrintStream out)
{
try
{
java.util.List<File> list = new java.util.ArrayList<File>();
java.lang.String line = null;
while ((line = bReader.readLine()) != null)
{
try
{
// kde seems to append a 0 char to the end of the reader
if (ZERO_CHAR_STRING.equals(line))
continue;
java.io.File file = new java.io.File(new java.net.URI(line));
list.add(file);
} catch (Exception ex)
{
log(out, "Error with " + line + ": " + ex.getMessage());
}
}
return list.toArray(new File[list.size()]);
} catch (IOException ex)
{
log(out, "FileDrop: IOException");
}
return new File[0];
}
// END 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added.
private void makeDropTarget(final java.io.PrintStream out,
final java.awt.Component c, boolean recursive)
{
// Make drop target
final java.awt.dnd.DropTarget dt = new java.awt.dnd.DropTarget();
try
{
dt.addDropTargetListener(dropListener);
} // end try
catch (java.util.TooManyListenersException e)
{
e.printStackTrace();
log(out,
"FileDrop: Drop will not work due to previous error. Do you have another listener attached?");
} // end catch
// Listen for hierarchy changes and remove the drop target when the
// parent gets cleared out.
c.addHierarchyListener(new java.awt.event.HierarchyListener()
{
@Override
public void hierarchyChanged(java.awt.event.HierarchyEvent evt)
{
log(out, "FileDrop: Hierarchy changed.");
java.awt.Component parent = c.getParent();
if (parent == null)
{
c.setDropTarget(null);
log(out, "FileDrop: Drop target cleared from component.");
} // end if: null parent
else
{
new java.awt.dnd.DropTarget(c, dropListener);
log(out, "FileDrop: Drop target added to component.");
} // end else: parent not null
} // end hierarchyChanged
}); // end hierarchy listener
if (c.getParent() != null)
new java.awt.dnd.DropTarget(c, dropListener);
if (recursive && (c instanceof java.awt.Container))
{
// Get the container
java.awt.Container cont = (java.awt.Container) c;
// Get it's components
java.awt.Component[] comps = cont.getComponents();
// Set it's components as listeners also
for (int i = 0; i < comps.length; i++)
makeDropTarget(out, comps[i], recursive);
} // end if: recursively set components as listener
} // end dropListener
/** Determine if the dragged data is a file list. */
private boolean isDragOk(final java.io.PrintStream out,
final java.awt.dnd.DropTargetDragEvent evt)
{
boolean ok = false;
// Get data flavors being dragged
java.awt.datatransfer.DataFlavor[] flavors = evt
.getCurrentDataFlavors();
// See if any of the flavors are a file list
int i = 0;
while (!ok && i < flavors.length)
{
// BEGIN 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support
// added.
// Is the flavor a file list?
final DataFlavor curFlavor = flavors[i];
if (curFlavor
.equals(java.awt.datatransfer.DataFlavor.javaFileListFlavor)
|| curFlavor.isRepresentationClassReader())
{
ok = true;
}
// END 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support
// added.
i++;
} // end while: through flavors
// If logging is enabled, show data flavors
if (out != null)
{
if (flavors.length == 0)
log(out, "FileDrop: no data flavors.");
for (i = 0; i < flavors.length; i++)
log(out, flavors[i].toString());
} // end if: logging enabled
return ok;
} // end isDragOk
/** Outputs <tt>message</tt> to <tt>out</tt> if it's not null. */
private static void log(java.io.PrintStream out, String message)
{ // Log message if requested
if (out != null)
out.println(message);
} // end log
/**
* Removes the drag-and-drop hooks from the component and optionally from
* the all children. You should call this if you add and remove components
* after you've set up the drag-and-drop. This will recursively unregister
* all components contained within <var>c</var> if <var>c</var> is a
* {@link java.awt.Container}.
*
* @param c
* The component to unregister as a drop target
* @since 1.0
*/
public static boolean remove(java.awt.Component c)
{
return remove(null, c, true);
} // end remove
/**
* Removes the drag-and-drop hooks from the component and optionally from
* the all children. You should call this if you add and remove components
* after you've set up the drag-and-drop.
*
* @param out
* Optional {@link java.io.PrintStream} for logging drag and drop
* messages
* @param c
* The component to unregister
* @param recursive
* Recursively unregister components within a container
* @since 1.0
*/
public static boolean remove(java.io.PrintStream out, java.awt.Component c,
boolean recursive)
{ // Make sure we support dnd.
if (supportsDnD())
{
log(out, "FileDrop: Removing drag-and-drop hooks.");
c.setDropTarget(null);
if (recursive && (c instanceof java.awt.Container))
{
java.awt.Component[] comps = ((java.awt.Container) c)
.getComponents();
for (int i = 0; i < comps.length; i++)
remove(out, comps[i], recursive);
return true;
} // end if: recursive
else
return false;
} // end if: supports DnD
else
return false;
} // end remove
/* ******** I N N E R I N T E R F A C E L I S T E N E R ******** */
/**
* Implement this inner interface to listen for when files are dropped. For
* example your class declaration may begin like this: <code><pre>
* public class MyClass implements FileDrop.Listener
* ...
* public void filesDropped( java.io.File[] files )
* {
* ...
* } // end filesDropped
* ...
* </pre></code>
*
* @since 1.1
*/
public static interface Listener
{
/**
* This method is called when files have been successfully dropped.
*
* @param files
* An array of <tt>File</tt>s that were dropped.
* @param point the point the files were dropped on
* @since 1.0
*/
public abstract void filesDropped(java.io.File[] files, Point point);
} // end inner-interface Listener
/* ******** I N N E R C L A S S ******** */
/**
* This is the event that is passed to the
* {@link FileDropListener#filesDropped filesDropped(...)} method in your
* {@link FileDropListener} when files are dropped onto a registered drop
* target.
*
* <p>
* I'm releasing this code into the Public Domain. Enjoy.
* </p>
*
* @author Robert Harder
* @author rob@iharder.net
* @version 1.2
*/
@SuppressWarnings("serial")
public static class Event extends java.util.EventObject
{
private java.io.File[] files;
/**
* Constructs an {@link Event} with the array of files that were dropped
* and the {@link FileDrop} that initiated the event.
*
* @param files
* The array of files that were dropped
* @source The event source
* @since 1.1
*/
public Event(java.io.File[] files, Object source)
{
super(source);
this.files = files;
} // end constructor
/**
* Returns an array of files that were dropped on a registered drop
* target.
*
* @return array of files that were dropped
* @since 1.1
*/
public java.io.File[] getFiles()
{
return files;
} // end getFiles
} // end inner class Event
/* ******** I N N E R C L A S S ******** */
/**
* At last an easy way to encapsulate your custom objects for dragging and
* dropping in your Java programs! When you need to create a
* {@link java.awt.datatransfer.Transferable} object, use this class to wrap
* your object. For example:
*
* <pre>
* <code>
* ...
* MyCoolClass myObj = new MyCoolClass();
* Transferable xfer = new TransferableObject( myObj );
* ...
* </code>
* </pre>
*
* Or if you need to know when the data was actually dropped, like when
* you're moving data out of a list, say, you can use the
* {@link TransferableObject.Fetcher} inner class to return your object Just
* in Time. For example:
*
* <pre>
* <code>
* ...
* final MyCoolClass myObj = new MyCoolClass();
*
* TransferableObject.Fetcher fetcher = new TransferableObject.Fetcher()
* { public Object getObject(){ return myObj; }
* }; // end fetcher
*
* Transferable xfer = new TransferableObject( fetcher );
* ...
* </code>
* </pre>
*
* The {@link java.awt.datatransfer.DataFlavor} associated with
* {@link TransferableObject} has the representation class
* <tt>net.iharder.dnd.TransferableObject.class</tt> and MIME type
* <tt>application/x-net.iharder.dnd.TransferableObject</tt>. This data
* flavor is accessible via the static {@link #DATA_FLAVOR} property.
*
*
* <p>
* I'm releasing this code into the Public Domain. Enjoy.
* </p>
*
* @author Robert Harder
* @author rob@iharder.net
* @version 1.2
*/
public static class TransferableObject implements
java.awt.datatransfer.Transferable
{
/**
* The MIME type for {@link #DATA_FLAVOR} is
* <tt>application/x-net.iharder.dnd.TransferableObject</tt>.
*
* @since 1.1
*/
public final static String MIME_TYPE = "application/x-net.iharder.dnd.TransferableObject";
/**
* The default {@link java.awt.datatransfer.DataFlavor} for
* {@link TransferableObject} has the representation class
* <tt>net.iharder.dnd.TransferableObject.class</tt> and the MIME type
* <tt>application/x-net.iharder.dnd.TransferableObject</tt>.
*
* @since 1.1
*/
public final static java.awt.datatransfer.DataFlavor DATA_FLAVOR = new java.awt.datatransfer.DataFlavor(
FileDrop.TransferableObject.class, MIME_TYPE);
private Fetcher fetcher;
private Object data;
private java.awt.datatransfer.DataFlavor customFlavor;
/**
* Creates a new {@link TransferableObject} that wraps <var>data</var>.
* Along with the {@link #DATA_FLAVOR} associated with this class, this
* creates a custom data flavor with a representation class determined
* from <code>data.getClass()</code> and the MIME type
* <tt>application/x-net.iharder.dnd.TransferableObject</tt>.
*
* @param data
* The data to transfer
* @since 1.1
*/
public TransferableObject(Object data)
{
this.data = data;
this.customFlavor = new java.awt.datatransfer.DataFlavor(
data.getClass(), MIME_TYPE);
} // end constructor
/**
* Creates a new {@link TransferableObject} that will return the object
* that is returned by <var>fetcher</var>. No custom data flavor is set
* other than the default {@link #DATA_FLAVOR}.
*
* @see Fetcher
* @param fetcher
* The {@link Fetcher} that will return the data object
* @since 1.1
*/
public TransferableObject(Fetcher fetcher)
{
this.fetcher = fetcher;
} // end constructor
/**
* Creates a new {@link TransferableObject} that will return the object
* that is returned by <var>fetcher</var>. Along with the
* {@link #DATA_FLAVOR} associated with this class, this creates a
* custom data flavor with a representation class <var>dataClass</var>
* and the MIME type
* <tt>application/x-net.iharder.dnd.TransferableObject</tt>.
*
* @see Fetcher
* @param dataClass
* The {@link java.lang.Class} to use in the custom data
* flavor
* @param fetcher
* The {@link Fetcher} that will return the data object
* @since 1.1
*/
public TransferableObject(Class<?> dataClass, Fetcher fetcher)
{
this.fetcher = fetcher;
this.customFlavor = new java.awt.datatransfer.DataFlavor(dataClass,
MIME_TYPE);
} // end constructor
/**
* Returns the custom {@link java.awt.datatransfer.DataFlavor}
* associated with the encapsulated object or <tt>null</tt> if the
* {@link Fetcher} constructor was used without passing a
* {@link java.lang.Class}.
*
* @return The custom data flavor for the encapsulated object
* @since 1.1
*/
public java.awt.datatransfer.DataFlavor getCustomDataFlavor()
{
return customFlavor;
} // end getCustomDataFlavor
/* ******** T R A N S F E R A B L E M E T H O D S ******** */
/**
* Returns a two- or three-element array containing first the custom
* data flavor, if one was created in the constructors, second the
* default {@link #DATA_FLAVOR} associated with
* {@link TransferableObject}, and third the
* {@link java.awt.datatransfer.DataFlavor.stringFlavor}.
*
* @return An array of supported data flavors
* @since 1.1
*/
@Override
public java.awt.datatransfer.DataFlavor[] getTransferDataFlavors()
{
if (customFlavor != null)
return new java.awt.datatransfer.DataFlavor[] { customFlavor,
DATA_FLAVOR,
java.awt.datatransfer.DataFlavor.stringFlavor }; // end
// flavors
// array
else
return new java.awt.datatransfer.DataFlavor[] { DATA_FLAVOR,
java.awt.datatransfer.DataFlavor.stringFlavor }; // end
// flavors
// array
} // end getTransferDataFlavors
/**
* Returns the data encapsulated in this {@link TransferableObject}. If
* the {@link Fetcher} constructor was used, then this is when the
* {@link Fetcher#getObject getObject()} method will be called. If the
* requested data flavor is not supported, then the
* {@link Fetcher#getObject getObject()} method will not be called.
*
* @param flavor
* The data flavor for the data to return
* @return The dropped data
* @since 1.1
*/
@Override
public Object getTransferData(java.awt.datatransfer.DataFlavor flavor)
throws java.awt.datatransfer.UnsupportedFlavorException,
java.io.IOException
{
// Native object
if (flavor.equals(DATA_FLAVOR))
return fetcher == null ? data : fetcher.getObject();
// String
if (flavor.equals(java.awt.datatransfer.DataFlavor.stringFlavor))
return fetcher == null ? data.toString() : fetcher.getObject()
.toString();
// We can't do anything else
throw new java.awt.datatransfer.UnsupportedFlavorException(flavor);
} // end getTransferData
/**
* Returns <tt>true</tt> if <var>flavor</var> is one of the supported
* flavors. Flavors are supported using the <code>equals(...)</code>
* method.
*
* @param flavor
* The data flavor to check
* @return Whether or not the flavor is supported
* @since 1.1
*/
@Override
public boolean isDataFlavorSupported(
java.awt.datatransfer.DataFlavor flavor)
{
// Native object
if (flavor.equals(DATA_FLAVOR))
return true;
// String
if (flavor.equals(java.awt.datatransfer.DataFlavor.stringFlavor))
return true;
// We can't do anything else
return false;
} // end isDataFlavorSupported
/* ******** I N N E R I N T E R F A C E F E T C H E R ******** */
/**
* Instead of passing your data directly to the
* {@link TransferableObject} constructor, you may want to know exactly
* when your data was received in case you need to remove it from its
* source (or do anyting else to it). When the {@link #getTransferData
* getTransferData(...)} method is called on the
* {@link TransferableObject}, the {@link Fetcher}'s {@link #getObject
* getObject()} method will be called.
*
* @author Robert Harder
* @copyright 2001
* @version 1.1
* @since 1.1
*/
public static interface Fetcher
{
/**
* Return the object being encapsulated in the
* {@link TransferableObject}.
*
* @return The dropped object
* @since 1.1
*/
public abstract Object getObject();
} // end inner interface Fetcher
} // end class TransferableObject
} // end class FileDrop