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public interface FunctionContext
Implemented by classes that know how to resolve XPath function names and namespaces to implementations of these functions.
By using a custom FunctionContext
, new or different
functions may be installed and available to XPath expression writers.
XPathFunctionContext
Method Summary | |
---|---|
Function |
getFunction(java.lang.String namespaceURI,
java.lang.String prefix,
java.lang.String localName)
An implementation should return a Function implementation object
based on the namespace URI and local name of the function-call
expression. |
Method Detail |
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Function getFunction(java.lang.String namespaceURI, java.lang.String prefix, java.lang.String localName) throws UnresolvableException
Function
implementation object
based on the namespace URI and local name of the function-call
expression.
It must not use the prefix parameter to select an implementation, because a prefix could be bound to any namespace; the prefix parameter could be used in debugging output or other generated information. The prefix may otherwise be completely ignored.
namespaceURI
- the namespace URI to which the prefix parameter
is bound in the XPath expression. If the function
call expression had no prefix, the namespace URI
is null
.prefix
- the prefix that was used in the function call
expressionlocalName
- the local name of the function-call expression.
If there is no prefix, then this is the whole
name of the function.
UnresolvableException
- when the function cannot be resolved
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