Converting Arguments to Java Extension Functions

This section describes how XPath values supplied in a call to a Java extension function are converted to Java values.

There are three phases of decision-making:

  • First, Saxon decides which method to call. See Choosing among overloaded methods above.

  • Saxon allocates a converter, wherever possible at compile time, based on the static type of the supplied argument and the Java type expected by the method.

  • At run-time the converter performs the conversion from the supplied value to the required type. Some converters will make further decisions based on run-time types at this stage.

The process of argument conversion is described further in the following pages.