com.saxonica.functions.extfn

Class GeneralFilterFunction.GeneralFilterFunctionCall

java.lang.Object

net.sf.saxon.lib.ExtensionFunctionCall

com.saxonica.functions.extfn.GeneralFilterFunction.GeneralFilterFunctionCall

All Implemented Interfaces:

Callable

Direct Known Subclasses:

HighestOrLowest

Enclosing class:

GeneralFilterFunction

public abstract static class GeneralFilterFunction.GeneralFilterFunctionCall
extends ExtensionFunctionCall

Field Summary

Fields

Modifier and Type	Field and Description
protected Function	atomizer
protected String	defaultCollation

Constructor Summary

Constructors

Constructor and Description
GeneralFilterFunction.GeneralFilterFunctionCall()

Method Summary

Methods

Modifier and Type	Method and Description
void	copyLocalData(ExtensionFunctionCall destination) Copy local data from one copy of the function to another.
void	supplyStaticContext(StaticContext env, int locationId, Expression[] arguments) Supply static context information.

Methods inherited from class net.sf.saxon.lib.ExtensionFunctionCall

call, effectiveBooleanValue, getDefinition, getStreamingImplementation, rewrite, setDefinition

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

defaultCollation

protected String defaultCollation

atomizer

protected Function atomizer

Constructor Detail

GeneralFilterFunction.GeneralFilterFunctionCall

public GeneralFilterFunction.GeneralFilterFunctionCall()

Method Detail

supplyStaticContext

public void supplyStaticContext(StaticContext env,
                       int locationId,
                       Expression[] arguments)
                         throws XPathException

Supply static context information.

This method is called during compilation to provide information about the static context in which the function call appears. If the implementation of the function needs information from the static context, then it should save it now, as it will not be available later at run-time.

The implementation also has the opportunity to examine the expressions that appear in the arguments to the function call at this stage. These might already have been modified from the original expressions as written by the user. The implementation should not modify any of these expressions.

The default implementation of this method does nothing.

Overrides:

supplyStaticContext in class ExtensionFunctionCall

Parameters:

env - The static context in which the function call appears. The method must not modify the static context.

locationId - An integer code representing the location of the call to the extension function in the stylesheet; can be used in conjunction with the locationMap held in the static context for diagnostics

arguments - The XPath expressions supplied in the call to this function. The method must not modify this array, or any of the expressions contained in the array.

Throws:

XPathException - if the implementation is able to detect a static error in the way the function is being called (for example it might require that the types of the arguments are consistent with each other).

copyLocalData

public void copyLocalData(ExtensionFunctionCall destination)

Copy local data from one copy of the function to another. This method must be implemented in any implementation that maintains local data retained from the static context; the job of the method is to copy this local data to the supplied destination function.

Overrides:

copyLocalData in class ExtensionFunctionCall

Parameters:

destination - the function to which the local data must be copied. This will always be an instance of the same function class as the source function.