Create code that can guess the return type of an expression -----------------------------------------------------------
Key: GEOT-1807 URL: http://jira.codehaus.org/browse/GEOT-1807 Project: GeoTools Issue Type: Improvement Components: core filter Affects Versions: 2.5-M0, 2.4.2 Reporter: Andrea Aime The literal/converter approach we're assuming that a target class is more or less always available when it comes to extract a usable value out of a literal. Unfortunately in many cases that is hard, for example 2 + 5 (7 or "25") 2.0 + 5 (7.0, 7 or "2.05"?) 5 + (5 + property) -> how do we use the property type when evaluating what the first 5 is going to be? A TypeVisitor is needed that takes an expression and drills down into it trying to understand what its resulting type will be. The result should be a type and a level of confidence, such as Integer, Assumption Double, Fact In the case 2 + 5 we'd end up with (Integer, Assumption), that is, we assume integer is going to be fine, but we have no actual attribute type telling us so. In the case 5 + (5 + property) we should end up with (Integer, Fact) since we know about the property type -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.codehaus.org/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Geotools-devel mailing list Geotools-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-devel