Constructor Detail

• StringFn

  public StringFn​()

Method Detail

• simplify

  public Expression simplify​(ExpressionVisitor visitor)
                      throws XPathException

  Simplify and validate. This is a pure function so it can be simplified in advance if the arguments are known

  Overrides:

  simplify in class FunctionCall

  Parameters:

  visitor - an expression visitor

  Returns:

  the simplified expression

  Throws:

  XPathException - if an error is discovered during expression rewriting

• addDocToPathMap

  public PathMap.PathMapNodeSet addDocToPathMap​(PathMap pathMap,
                                                PathMap.PathMapNodeSet pathMapNodes)

  Add a representation of a doc() call or similar function to a PathMap. This is a convenience method called by the addToPathMap() methods for doc(), document(), collection() and similar functions. These all create a new root expression in the path map.

  Overrides:

  addDocToPathMap in class SystemFunction

  Parameters:

  pathMap - the PathMap to which the expression should be added

  pathMapNodes - the node in the PathMap representing the focus at the point where this expression is called. Set to null if this expression appears at the top level.

  Returns:

  the pathMapNode representing the focus established by this expression, in the case where this expression is the first operand of a path expression or filter expression

• evaluateItem

  public Item evaluateItem​(XPathContext c)
                    throws XPathException

  Evaluate the function

  Specified by:

  evaluateItem in interface EvaluableItem

  Overrides:

  evaluateItem in class Expression

  Parameters:

  c - The context in which the expression is to be evaluated

  Returns:

  the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence

  Throws:

  XPathException - if any dynamic error occurs evaluating the expression