Changes between Initial Version and Version 1 of FDORfc44

Timestamp:

11/10/09 10:28:22 (15 years ago)

Author:

oresthalustchak

Comment:

--

FDORfc44

@@ +1 @@
+= FDO RFC 44 - Add IF Expression Function =
+
+This page contains an change request (RFC) for the FDO Open Source project.  
+More FDO RFCs can be found on the [wiki:FDORfcs RFCs] page.
+
+
+== Status == 
+ 
+||RFC Template Version||(1.0)|| 
+||Submission Date|| Nov. 10, 2009 ||
+||Last Modified|| Orest Halustchak [[Timestamp]]||
+||Author||Orest Halustchak||
+||RFC Status||Not Ready for Review|| 
+||Implementation Status||draft||
+||Proposed Milestone||3.5.0.0||
+||Assigned PSC guide(s)||Orest Halustchak||
+||'''Voting History'''|| ||
+||+1|| ||
+||+0|| ||
+||-0|| ||
+||-1|| ||
+ 
+== Motivation ==
+
+This enhancement is to allow an application using an FDO expression to generate different values from a boolean expression. Typically this is to generate a different string value from a boolean expression. The MapGuide stylization engine includes a similar function, but it is not available at the FDO level and will be useful for users at this level.
+
+== Overview ==
+
+This RFC proposes a new FDO expression function called IF that takes a boolean expression and chooses between two data values for the output. This function will be based on the stylization function and will be a migration of that implementation.
+
+== Proposed Solution ==
+
+Define a new FDO Expression function called IF.
+
+{{{
+    ///  
+    /// Result, ValueIfTrue, and ValueIfFalse are the same data type. They can be any FDO numeric, string, or date/time data type.
+    /// If Boolean Expression evaluates to true, then ValueIfTrue is returned. If Boolean Expression evaluates to false or is null, 
+    /// then ValueIfFalse is returned.
+
+    Result = IF(Boolean Expression, ValueIfTrue, ValueIfFalse)
+  
+    /// 
+    /// E.g. IF(BoolProperty, ‘Oui’, ‘Non’) would generate ‘Oui’ if BoolProperty is true, otherwise ‘Non’.
+    /// E.g. IF(BoolProperty, 1, -1) would generate 1 or -1.
+
+}}}
+
+
+== Provider Implementation ==
+
+TBD.
+
+== Test Plan ==
+Expand unit tests to test the proposed enhancements defined above. 
+
+== Funding/Resources ==
+
+Autodesk to provide resources / funding.
+