Calling Java Instance-Level Methods
Instance-level methods (that is, non-static methods)
are called by supplying an extra first argument of type Java Object which is the
object on which the method is to be invoked. A Java Object is usually created by calling an extension
function (e.g. a constructor) that returns an object; it may also be passed to the style sheet as the
value of a global parameter. Matching of method names is done as for static methods.
If there are several methods in the class that match the localname, the system again tries to
find the one that is the best fit, according to the types of the supplied arguments.
For example, the following XSLT stylesheet prints the date and time. (In XSLT 2.0, of course,
this no longer requires extension functions, but the example is still valid.)
<xsl:if test="function-available('date:to-string') and
The equivalent in XQuery is:
declare namespace date="java:java.util.Date";
As with static methods, an instance-level Java method called as an extension function may have an extra first argument of
This argument is not
supplied by the calling XPath or XQuery code, but by Saxon itself.
XPathContext object provides methods to access many
internal Saxon resources, the most useful being
getContextItem() which returns the context item
from the dynamic context. The XPathContext object is not available with constructors.
If any exceptions are thrown by the method, or if a matching method cannot be found,
processing of the stylesheet will be abandoned. If the tracing option has been set (-T) on the
command line, a full stack trace will be output. The exception will be wrapped in a
TransformerException and passed to any user-specified
ErrorListener can also produce extra diagnostics.