package op.system;
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.io.*;
/**
* 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/>
* <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 = Color.yellow; //new java.awt.Color(0f, 0f, 1f, 0.25f);
/**
* Constructs a {@link op.system.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 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 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 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 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() {
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
public void dragOver(java.awt.dnd.DropTargetDragEvent evt) { // This is called continually as long as the mouse is
// over the drag target.
} // end dragOver
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(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
java.util.List fileList = (java.util.List)
tr.getTransferData(DataFlavor.javaFileListFlavor);
java.util.Iterator iterator = fileList.iterator();
// Convert list to array
File[] filesTemp = new File[fileList.size()];
fileList.toArray(filesTemp);
final File[] files = filesTemp;
// Alert listener to drop.
if (listener != null)
listener.filesDropped(files);
// 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));
// 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 (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
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
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 {
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 list = new java.util.ArrayList();
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;
File file = new File(new java.net.URI(line));
list.add(file);
} catch (Exception ex) {
log(out, "Error with " + line + ": " + ex.getMessage());
}
}
return (File[]) 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 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(evt -> {
log(out, "FileDrop: Hierarchy changed.");
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 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 PrintStream out, final java.awt.dnd.DropTargetDragEvent evt) {
boolean ok = false;
// Get data flavors being dragged
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(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(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(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.
* @since 1.0
*/
public abstract void filesDropped(File[] files);
} // 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/>
* <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 Event extends java.util.EventObject {
private File[] files;
/**
* Constructs an {@link op.system.FileDrop.Event} with the array
* of files that were dropped and the
* {@link op.system.FileDrop} that initiated the event.
*
* @param files The array of files that were dropped
* @source The event source
* @since 1.1
*/
public Event(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 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 op.system.FileDrop.TransferableObject.Fetcher}
* inner class to return your object Just in Time.
* For example:
* <pre><code>
* ...
* final MyCoolClass myObj = new MyCoolClass();
* <p/>
* TransferableObject.Fetcher fetcher = new TransferableObject.Fetcher()
* { public Object getObject(){ return myObj; }
* }; // end fetcher
* <p/>
* Transferable xfer = new TransferableObject( fetcher );
* ...
* </code></pre>
* <p/>
* The {@link java.awt.datatransfer.DataFlavor} associated with
* {@link op.system.FileDrop.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/>
* <p/>
* <p>I'm releasing this code into the Public Domain. Enjoy.</p>
*
* http://iharder.sourceforge.net/current/java/filedrop/
*
* @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 op.system.FileDrop.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 DataFlavor DATA_FLAVOR =
new DataFlavor(TransferableObject.class, MIME_TYPE);
private Fetcher fetcher;
private Object data;
private DataFlavor customFlavor;
/**
* Creates a new {@link op.system.FileDrop.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 DataFlavor(data.getClass(), MIME_TYPE);
} // end constructor
/**
* Creates a new {@link op.system.FileDrop.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}.
*
* @param fetcher The {@link op.system.FileDrop.TransferableObject.Fetcher} that will return the data object
* @see op.system.FileDrop.TransferableObject.Fetcher
* @since 1.1
*/
public TransferableObject(Fetcher fetcher) {
this.fetcher = fetcher;
} // end constructor
/**
* Creates a new {@link op.system.FileDrop.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>.
*
* @param dataClass The {@link Class} to use in the custom data flavor
* @param fetcher The {@link op.system.FileDrop.TransferableObject.Fetcher} that will return the data object
* @see op.system.FileDrop.TransferableObject.Fetcher
* @since 1.1
*/
public TransferableObject(Class dataClass, Fetcher fetcher) {
this.fetcher = fetcher;
this.customFlavor = new 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 op.system.FileDrop.TransferableObject.Fetcher}
* constructor was used without passing a {@link Class}.
*
* @return The custom data flavor for the encapsulated object
* @since 1.1
*/
public 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 op.system.FileDrop.TransferableObject}, and third the
* {@link java.awt.datatransfer.DataFlavor.stringFlavor}.
*
* @return An array of supported data flavors
* @since 1.1
*/
public DataFlavor[] getTransferDataFlavors() {
if (customFlavor != null)
return new DataFlavor[]
{customFlavor,
DATA_FLAVOR,
DataFlavor.stringFlavor
}; // end flavors array
else
return new DataFlavor[]
{DATA_FLAVOR,
DataFlavor.stringFlavor
}; // end flavors array
} // end getTransferDataFlavors
/**
* Returns the data encapsulated in this {@link op.system.FileDrop.TransferableObject}.
* If the {@link op.system.FileDrop.TransferableObject.Fetcher} constructor was used, then this is when
* the {@link op.system.FileDrop.TransferableObject.Fetcher#getObject getObject()} method will be called.
* If the requested data flavor is not supported, then the
* {@link op.system.FileDrop.TransferableObject.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
*/
public Object getTransferData(DataFlavor flavor)
throws java.awt.datatransfer.UnsupportedFlavorException, IOException {
// Native object
if (flavor.equals(DATA_FLAVOR))
return fetcher == null ? data : fetcher.getObject();
// String
if (flavor.equals(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
*/
public boolean isDataFlavorSupported(DataFlavor flavor) {
// Native object
if (flavor.equals(DATA_FLAVOR))
return true;
// String
if (flavor.equals(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 op.system.FileDrop.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 op.system.FileDrop.TransferableObject}, the {@link op.system.FileDrop.TransferableObject.Fetcher}'s
* {@link #getObject getObject()} method will be called.
*
* @author Robert Harder
* @version 1.1
* @copyright 2001
* @since 1.1
*/
public static interface Fetcher {
/**
* Return the object being encapsulated in the
* {@link op.system.FileDrop.TransferableObject}.
*
* @return The dropped object
* @since 1.1
*/
public abstract Object getObject();
} // end inner interface Fetcher
} // end class TransferableObject
} // end class FileDrop