Class PublicStylesheetFunctionLibrary

java.lang.Object
net.sf.saxon.style.PublicStylesheetFunctionLibrary
All Implemented Interfaces:
FunctionLibrary

public class PublicStylesheetFunctionLibrary extends Object implements FunctionLibrary
A PublicStylesheetFunctionLibrary filters a StylesheetFunctionLibrary to include only those functions whose visibility is final or public. Used by xsl:evaluate
  • Constructor Details

    • PublicStylesheetFunctionLibrary

      public PublicStylesheetFunctionLibrary(FunctionLibrary base)
      Create a FunctionLibrary that provides access to public stylesheet functions
      Parameters:
      base - the base function library of which this one is a subset
  • Method Details

    • bind

      public Expression bind(SymbolicName.F functionName, Expression[] staticArgs, Map<StructuredQName,Integer> keywords, StaticContext env, List<String> reasons) throws XPathException
      Bind a function, given the URI and local parts of the function name, and the list of expressions supplied as arguments. This method is called at compile time.
      Specified by:
      bind in interface FunctionLibrary
      Parameters:
      functionName - The name of the function
      staticArgs - The expressions supplied statically in the function call. The intention is that the static type of the arguments (obtainable via getItemType() and getCardinality() may be used as part of the binding algorithm.
      keywords - May be null if no keywords are used in the function call. Otherwise, a map identifying the keywords appearing in the function call, and the 0-based position at which they appeared.
      env - The static context
      reasons - If no matching function is found by the function library, it may add a diagnostic explanation to this list explaining why none of the available functions could be used.
      Returns:
      An object representing the extension function to be called, if one is found; null if no extension function was found matching the required name and arity.
      Throws:
      XPathException - if a matching function was identified, but the call is incorrect, for example because it uses incorrect argument keywords
    • getFunctionItem

      public FunctionItem getFunctionItem(SymbolicName.F functionName, StaticContext staticContext) throws XPathException
      Test whether a function with a given name and arity is available; if so, return a function item that can be dynamically called.

      This supports the function-lookup() function in XPath 3.0.

      Specified by:
      getFunctionItem in interface FunctionLibrary
      Parameters:
      functionName - the qualified name of the function being called
      staticContext - the static context to be used by the function, in the event that it is a system function with dependencies on the static context
      Returns:
      if a function of this name and arity is available for calling, then a corresponding function item; or null if the function does not exist
      Throws:
      XPathException - in the event of certain errors, for example attempting to get a function that is private
    • isAvailable

      public boolean isAvailable(SymbolicName.F functionName, int languageLevel)
      Test whether a function with a given name and arity is available

      This supports the function-available() function in XSLT.

      Specified by:
      isAvailable in interface FunctionLibrary
      Parameters:
      functionName - the qualified name of the function being called
      languageLevel - the XPath language level (times 10, e.g. 31 for XPath 3.1)
      Returns:
      true if a function of this name and arity is available for calling
    • copy

      public FunctionLibrary copy()
      This method creates a copy of a FunctionLibrary: if the original FunctionLibrary allows new functions to be added, then additions to this copy will not affect the original, or vice versa.
      Specified by:
      copy in interface FunctionLibrary
      Returns:
      a copy of this function library. This must be an instance of the original class.