1 /*

     2  * Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package sun.awt.X11;

    27 

    28 import java.util.ArrayList;

    29 import java.util.Collections;

    30 import java.util.Iterator;

    31 import java.util.List;

    32 

    33 /**

    34  * This class is a registry for the supported drag and drop protocols.

    35  *

    36  * @since 1.5

    37  */

    38 final class XDragAndDropProtocols {

    39     private final static List dragProtocols;

    40     private final static List dropProtocols;

    41 

    42     public static final String XDnD = "XDnD";

    43     public static final String MotifDnD = "MotifDnD";

    44 

    45     static {

    46         // Singleton listener for all drag source protocols.

    47         XDragSourceProtocolListener dragSourceProtocolListener =

    48             XDragSourceContextPeer.getXDragSourceProtocolListener();

    49         // Singleton listener for all drop target protocols.

    50         XDropTargetProtocolListener dropTargetProtocolListener =

    51             XDropTargetContextPeer.getXDropTargetProtocolListener();

    52 

    53         List tDragSourceProtocols = new ArrayList();

    54         XDragSourceProtocol xdndDragSourceProtocol =

    55             XDnDDragSourceProtocol.createInstance(dragSourceProtocolListener);

    56         tDragSourceProtocols.add(xdndDragSourceProtocol);

    57         XDragSourceProtocol motifdndDragSourceProtocol =

    58             MotifDnDDragSourceProtocol.createInstance(dragSourceProtocolListener);

    59         tDragSourceProtocols.add(motifdndDragSourceProtocol);

    60 

    61         List tDropTargetProtocols = new ArrayList();

    62         XDropTargetProtocol xdndDropTargetProtocol =

    63             XDnDDropTargetProtocol.createInstance(dropTargetProtocolListener);

    64         tDropTargetProtocols.add(xdndDropTargetProtocol);

    65         XDropTargetProtocol motifdndDropTargetProtocol =

    66             MotifDnDDropTargetProtocol.createInstance(dropTargetProtocolListener);

    67         tDropTargetProtocols.add(motifdndDropTargetProtocol);

    68 

    69         dragProtocols = Collections.unmodifiableList(tDragSourceProtocols);

    70         dropProtocols = Collections.unmodifiableList(tDropTargetProtocols);

    71     }

    72 

    73     static Iterator getDragSourceProtocols() {

    74         return dragProtocols.iterator();

    75     }

    76 

    77     static Iterator getDropTargetProtocols() {

    78         return dropProtocols.iterator();

    79     }

    80 

    81     /*

    82      * Returns a XDragSourceProtocol whose name equals to the specified string

    83      * or null if no such protocol is registered.

    84      */

    85     public static XDragSourceProtocol getDragSourceProtocol(String name) {

    86         // Protocol name cannot be null.

    87         if (name == null) {

    88             return null;

    89         }

    90 

    91         Iterator dragProtocols = XDragAndDropProtocols.getDragSourceProtocols();

    92         while (dragProtocols.hasNext()) {

    93             XDragSourceProtocol dragProtocol =

    94                 (XDragSourceProtocol)dragProtocols.next();

    95             if (dragProtocol.getProtocolName().equals(name)) {

    96                 return dragProtocol;

    97             }

    98         }

    99 

   100         return null;

   101     }

   102 

   103     /*

   104      * Returns a XDropTargetProtocol which name equals to the specified string

   105      * or null if no such protocol is registered.

   106      */

   107     public static XDropTargetProtocol getDropTargetProtocol(String name) {

   108         // Protocol name cannot be null.

   109         if (name == null) {

   110             return null;

   111         }

   112 

   113         Iterator dropProtocols = XDragAndDropProtocols.getDropTargetProtocols();

   114         while (dropProtocols.hasNext()) {

   115             XDropTargetProtocol dropProtocol =

   116                 (XDropTargetProtocol)dropProtocols.next();

   117             if (dropProtocol.getProtocolName().equals(name)) {

   118                 return dropProtocol;

   119             }

   120         }

   121 

   122         return null;

   123     }

   124 }