Name: sdC67446 Date: 05/22/98


spec for constructor
java.awt.dnd.DragSourceContext(java.awt.dnd.peer.DragSourceContextPeer dscp,
DragGestureEvent trigger, Cursor dragCursor, Image dragImage, Point dragOrigin,
Transferable t, DragSourceListener dsl) says nothing about behavior for
null parameters.
Currently ctor throws NullPointerException for parameters:
dscp, trigger and t, and ignore null for other parameters.

More convenient behavior here is to throw NullPointerException
for all null parameters or else it should be figured in spec.

Also ctor throws unexpected NullPointerException and IllegalArgumentException
if trigger instance is incomplete:
trigger.getComponent()==null,
trigger.getDragSource()==null,
trigger.getDragAction()==DnDConstants.ACTION_NONE,
rigger.getSourceAsDragGestureRecognizer().getSourceActions()) == DnDConstants.ACTION_NONE.

Here is what doc says:
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public DragSourceContext(java.awt.dnd.peer.DragSourceContextPeer dscp,
                         DragGestureEvent trigger,
                         Cursor dragCursor,
                         Image dragImage,
                         Point offset,
                         Transferable t,
                         DragSourceListener dsl)

      construct a DragSourceContext (called from DragSource)
      Parameters:
            dscp - The DragSourceContextPeer for this Drag
            trigger - The triggering event
            dragCursor - The initial Cursor
            dragImage - The image to drag (or null)
            offset - The offset of the image origin from
                     the hotspot at the instant of the
                     triggering event
            t - The Transferable
            dsl - The DragSourceListener

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