An EditorFactory is the basis of pluggable editor components. One
can configure the debugger with a new EditorFactory, which
completely replaces how the debugger displays source code.
Opens the given file in a new window. The debugger has already
taken care of ensuring that the file can be found. The debugger
will typically not create two Editor objects for the same source
file, as it keeps track of open files. The EditorCommands object
provided to the Editor by the debugger allows the Editor to
notify the debugger of events such as a breakpoint being set or
a window being closed.
Retrieves the current topmost file of all of the Editors this
EditorFactory has opened. This is used for the debugger user
interface to request that a breakpoint be set. (Editors can also
request that breakpoints be set via the EditorCommands, but this
is intended to support external editors with their own
keystrokes for performing this operation.) Returns null if there
is no file currently being edited.