/*

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

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

 *

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

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

 * published by the Free Software Foundation.  Sun designates this

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

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

 *

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

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

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

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

 * accompanied this code).

 *

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

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

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

 *

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

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

 * have any questions.

 */

package sun.awt.X11;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Iterator;

import java.util.List;

/**

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

 *

 * @since 1.5

 */

final class XDragAndDropProtocols {

    private final static List dragProtocols;

    private final static List dropProtocols;

    public static final String XDnD = "XDnD";

    public static final String MotifDnD = "MotifDnD";

    static {

        // Singleton listener for all drag source protocols.

        XDragSourceProtocolListener dragSourceProtocolListener =

            XDragSourceContextPeer.getXDragSourceProtocolListener();

        // Singleton listener for all drop target protocols.

        XDropTargetProtocolListener dropTargetProtocolListener =

            XDropTargetContextPeer.getXDropTargetProtocolListener();

        List tDragSourceProtocols = new ArrayList();

        XDragSourceProtocol xdndDragSourceProtocol =

            XDnDDragSourceProtocol.createInstance(dragSourceProtocolListener);

        tDragSourceProtocols.add(xdndDragSourceProtocol);

        XDragSourceProtocol motifdndDragSourceProtocol =

            MotifDnDDragSourceProtocol.createInstance(dragSourceProtocolListener);

        tDragSourceProtocols.add(motifdndDragSourceProtocol);

        List tDropTargetProtocols = new ArrayList();

        XDropTargetProtocol xdndDropTargetProtocol =

            XDnDDropTargetProtocol.createInstance(dropTargetProtocolListener);

        tDropTargetProtocols.add(xdndDropTargetProtocol);

        XDropTargetProtocol motifdndDropTargetProtocol =

            MotifDnDDropTargetProtocol.createInstance(dropTargetProtocolListener);

        tDropTargetProtocols.add(motifdndDropTargetProtocol);

        dragProtocols = Collections.unmodifiableList(tDragSourceProtocols);

        dropProtocols = Collections.unmodifiableList(tDropTargetProtocols);

    }

    static Iterator getDragSourceProtocols() {

        return dragProtocols.iterator();

    }

    static Iterator getDropTargetProtocols() {

        return dropProtocols.iterator();

    }

    /*

     * Returns a XDragSourceProtocol whose name equals to the specified string

     * or null if no such protocol is registered.

     */

    public static XDragSourceProtocol getDragSourceProtocol(String name) {

        // Protocol name cannot be null.

        if (name == null) {

            return null;

        }

        Iterator dragProtocols = XDragAndDropProtocols.getDragSourceProtocols();

        while (dragProtocols.hasNext()) {

            XDragSourceProtocol dragProtocol =

                (XDragSourceProtocol)dragProtocols.next();

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

                return dragProtocol;

            }

        }

        return null;

    }

    /*

     * Returns a XDropTargetProtocol which name equals to the specified string

     * or null if no such protocol is registered.

     */

    public static XDropTargetProtocol getDropTargetProtocol(String name) {

        // Protocol name cannot be null.

        if (name == null) {

            return null;

        }

        Iterator dropProtocols = XDragAndDropProtocols.getDropTargetProtocols();

        while (dropProtocols.hasNext()) {

            XDropTargetProtocol dropProtocol =

                (XDropTargetProtocol)dropProtocols.next();

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

                return dropProtocol;

            }

        }

        return null;

    }

}