resolve_object.pro
5.62 KB
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;+
; NAME:
; RESOLVE_OBJECT
;
; PURPOSE:
;
; The purpose of this function is to resolve object methods in files that have the object
; methods in the same file as the object class definition module (i.e., object__define.pro).
; It is particularly useful in restoring object methods for objects that have been saved and
; are being restored. Restored objects often do not know about their methods unless an object
; of the same object class has been previously compiled in that IDL session.
;
; AUTHOR:
;
; FANNING SOFTWARE CONSULTING
; David Fanning, Ph.D.
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: david@idlcoyote.com
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
;
; CATEGORY:
;
; Utilities
;
; CALLING SEQUENCE:
;
; Resolve_Object, obj_or_class
;
; ARGUMENTS:
;
; obj_or_class: Either an IDL object or the class name of an IDL object. Required parameter.
;
; KEYWORDRS:
;
; ROUTINE_INFO: Not strictly used by the user of the program, but this provides a mechanism by which
; currently compiled routine names can be checked, so that object code is not being
; recompiled unnecessarily. It is actually used internally in the code in a sort of
; recursive approach to handling object superclasses.
;
; INFORMATION:
;
; A discussion of this routine, and of the problem the routine was written to address can
; be found here:
;
; http://www.idlcoyote.com/tips/saved_objects.html
;
; MODIFICATION HISTORY:
;
; Written by: David W. Fanning, August 20, 2009, and based on code written by JD Smith and
; discussed in the article above.
;-
;******************************************************************************************;
; Copyright (c) 2009, by Fanning Software Consulting, Inc. ;
; All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
PRO Resolve_Object, obj_or_class, ROUTINE_INFO=ri
ON_ERROR, 2 ; Return to caller.
IF N_Params() NE 0 THEN BEGIN
IF Size(obj_or_class, /TNAME) EQ 'STRING' THEN BEGIN
class = StrUpCase(obj_or_class)
ENDIF ELSE BEGIN
IF ~Obj_Valid(obj_or_class) THEN BEGIN
Message, 'Object is not valid.'
ENDIF
class = Obj_Class(obj_or_class)
ENDELSE
ENDIF ELSE Message, 'One argument, either an object or an object class name, is required.'
IF N_Elements(ri) EQ 0 THEN ri = Routine_Info()
FOR j=0,N_Elements(class)-1 DO BEGIN
defpro = class[j]+'__DEFINE'
IF (Where(ri EQ defpro))[0] EQ -1 THEN BEGIN
;; Compile and define the class. Silent error handler
;; to skip the case where the superclass is a built-in
;; IDL routine.
Catch, theError
IF theError NE 0 THEN BEGIN
CONTINUE
GOTO, skipcall
ENDIF
Call_Procedure, defpro
skipcall:
Catch, /CANCEL
ENDIF
; Do superclass objects here.
supers = Obj_Class(class[j], /SUPERCLASS, COUNT=cnt)
IF cnt GT 0 THEN Resolve_Object, supers, ROUTINE_INFO=ri
ENDFOR
END