Script expressions can use a variety of scripting languages. Currently supported languages are:
Script Expression Structure
All the script expressions have the same internal structure no matter where and how they are used. The structure is illustrated in the following code snippet.
<expression> <script> <language>http://midpoint.evolveum.com/xml/ns/public/expression/language#Groovy</language> <code> 'Mr. ' + user.getFamilyName(); </code> </script> </expression>
Meaning of individual script expression fields is as follows:
Language URL. Specifies the language in which the expression is written. If not specified it defaults to Groovy language.
TODO See below for more details. If not specified and allowed by the expression usage it defaults to relative mode.
Expression code. Depends on the script language used for the expression. This is usually a string, but it also may be an XML. Please note that the code is embedded in the XML therefore proper XML escaping is required
The XPath expressions used in midPoint are most frequently using variables. For example, the following XPath expression will evaluate to the content of the
fullName property of a user (using
c as a namespace prefix):
<code> $c:user/c:fullName </code>
<code> user.getFullName(); </code>
See Expression page for more generic information about the use of variables in expressions.
Absolute and Relative Script Expressions
The expressions are designed to be extensible and the expression language is not fixed. New expression languages may come in the future if there is a demand for them.