Package net.sf.saxon.functions.registry

Class ConstructorFunctionLibrary

  • All Implemented Interfaces:
    FunctionLibrary
    public class ConstructorFunctionLibrary
extends java.lang.Object
implements FunctionLibrary
    The ConstructorFunctionLibrary represents the collection of constructor functions for atomic types. These are provided for the built-in types such as xs:integer and xs:date, and also for user-defined atomic types.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      Expression bind​(SymbolicName.F functionName, Expression[] arguments, StaticContext env, java.util.List<java.lang.String> reasons)
      Bind a static function call, given the URI and local parts of the function name, and the list of expressions supplied as arguments.
      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.
      Function getFunctionItem​(SymbolicName.F functionName, StaticContext staticContext)
      Test whether a function with a given name and arity is available; if so, return a function item that can be dynamically called.
      boolean isAvailable​(SymbolicName.F functionName)
      Test whether a function with a given name and arity is available

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • ConstructorFunctionLibrary

        public ConstructorFunctionLibrary​(Configuration config)
        Create a SystemFunctionLibrary
        Parameters:
        config - the Configuration

    • Method Detail

      • getFunctionItem

        public Function 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)
        Description copied from interface: FunctionLibrary
        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, together with its arity. For legacy reasons, the arity may be set to -1 to mean any arity will do
        Returns:
        true if a function of this name and arity is available for calling

      • bind

        public Expression bind​(SymbolicName.F functionName,
                       Expression[] arguments,
                       StaticContext env,
                       java.util.List<java.lang.String> reasons)
        Bind a static function call, 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 QName of the function
        arguments - 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.
        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 constructor function to be called, if one is found; null if no constructor function was found matching the required name and arity.

      • 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.