Its look like that a new method has been added in the Function interface (see
attached diff), and GeoTools implementation do not yet implement it.
Given that the documentation in the returns tag said "Optional", I assume that
it is okay to just implement them as "return null" in GeoTools.
Martin
Index: geoapi/src/main/java/org/opengis/filter/expression/Function.java
===================================================================
--- geoapi/src/main/java/org/opengis/filter/expression/Function.java
(révision 1192)
+++ geoapi/src/main/java/org/opengis/filter/expression/Function.java (copie
de travail)
@@ -29,6 +29,7 @@
* by that specification.
*
* @version <A HREF="http://www.opengis.org/docs/02-059.pdf";>Implementation
specification 1.0</A>
+ * @version <A HREF="http://www.opengeospatial.org/standards/symbol";>Symbology
Encoding Implementation Specification 1.1.0</A>
* @author Chris Dillard (SYS Technologies)
* @since GeoAPI 2.0
*/
@@ -49,4 +50,14 @@
* parameters to the function.
*/
List<Expression> getParameters();
+
+ /**
+ * The value of the fallbackValue attribute is used as a default value, if
the SE
+ * implementation does not support the function. If the implementation
supports the
+ * function, then the result value is determined by executing the function.
+ *
+ * @return Optional Literal to use if an implementation for this function
is not available
+ */
+ @XmlElement("fallbackValue")
+ Literal getFallbackValue();
}
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