The bean named shibboleth.Functions.Expression executes a Spring Expression Language (SpEL) expression to implement an arbitrary Function signature.
The bean named shibboleth.BiFunctions.Expression 4.1 executes a Spring Expression Language (SpEL) expression to implement an arbitrary BiFunction signature.
An Expression Function is instantiated by supplying a string argument that contains a SpEL expression to evaluate.
Example
<bean id="MyFunction" parent="shibboleth.Functions.Expression" c:expression="#input + 42" />