Field Detail

• SAME_AS_FIRST_ARGUMENT

  protected static ItemType SAME_AS_FIRST_ARGUMENT

Method Detail

• makeEntry

  public static StandardFunction.Entry makeEntry​(java.lang.String name,
                                                 java.lang.Class implementationClass,
                                                 int opcode,
                                                 int minArguments,
                                                 int maxArguments,
                                                 ItemType itemType,
                                                 int cardinality)

  Make a table entry describing the signature of a function, with a reference to the implementation class.

  Parameters:

  name - the function name

  implementationClass - the class used to implement the function

  opcode - identifies the function when a single class implements several functions

  minArguments - the minimum number of arguments required

  maxArguments - the maximum number of arguments allowed

  itemType - the item type of the result of the function

  cardinality - the cardinality of the result of the function

  Returns:

  the entry describing the function. The entry is incomplete, it does not yet contain information about the function arguments.

• arg

  public static void arg​(StandardFunction.Entry e,
                         int a,
                         ItemType type,
                         int cardinality,
                         Value resultIfEmpty)

  Add information to a function entry about the argument types of the function

  Parameters:

  e - the entry for the function

  a - the position of the argument, counting from zero

  type - the item type of the argument

  cardinality - the cardinality of the argument

  resultIfEmpty - the value returned by the function if an empty sequence appears as the value, when this result is unaffected by any other arguments

• getFunction

  public static StandardFunction.Entry getFunction​(java.lang.String name,
                                                   int arity)

  Get the table entry for the function with a given name

  Parameters:

  name - the name of the function. This may be an unprefixed local-name for functions in the system namespace, or may use the conventional prefix "saxon:" in the case of Saxon extension functions that are specially recognized

  Returns:

  if the function name is known, an Entry containing information about the function. Otherwise, null