Function Elements
Functions used in EL expressions are mapped to static methods in a
Java class using any number of <function>
elements after the <tag-file> elements, if
any. As with the other main elements, a number of nested elements
define the details: <description>,
<display-name>,
<icon>, <name>,
<function-class>,
<function-signature>, and
<example>.
The optional <description>,
<display-name>, and
<icon> elements can be used to describe the
function in the same way as for all other items.
The mandatory <name> element contains the
function name. Each function must have a unique name within the tag
library.
The name of the class that contains the implementation of the
function is specified by the mandatory
<function-class>
element as a fully qualified class name
(i.e., including the package name).
The mandatory
<function-signature>
element specifies the function
parameters and return type in the format
returnType
functionName(parameterType,
...), e.g.:
java.lang.String truncate(java.lang.String, int)
The optional nested <example> element is
used the same as in all other elements.
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