Constructor Detail

• Reverse

  public Reverse​()

Method Detail

• getItemType

  public ItemType getItemType​(TypeHierarchy th)

  Determine the item type of the value returned by the function

  Overrides:

  getItemType in class SystemFunction

  Parameters:

  th - the type hierarchy cache

  Returns:

  a value such as Type.STRING, Type.BOOLEAN, Type.NUMBER, Type.NODE, or Type.ITEM (meaning not known at compile time)

• computeSpecialProperties

  public int computeSpecialProperties​()

  Description copied from class: SystemFunction
  Determine the special properties of this expression. The general rule is that a system function call is non-creative if its return type is atomic, or if all its arguments are non-creative. This is overridden for the generate-id() function, which is considered creative if its operand is creative (because the result depends on the identity of the operand)

  Overrides:

  computeSpecialProperties in class SystemFunction

  Returns:

  the special properties, as a bit-significant integer

• iterate

  public SequenceIterator iterate​(XPathContext context)
                           throws XPathException

  Description copied from class: Expression
  Return an Iterator to iterate over the values of a sequence. The value of every expression can be regarded as a sequence, so this method is supported for all expressions. This default implementation handles iteration for expressions that return singleton values: for non-singleton expressions, the subclass must provide its own implementation.

  Specified by:

  iterate in interface SequenceIterable

  Overrides:

  iterate in class Expression

  Parameters:

  context - supplies the context for evaluation

  Returns:

  a SequenceIterator that can be used to iterate over the result of the expression

  Throws:

  XPathException - if any dynamic error occurs evaluating the expression

• effectiveBooleanValue

  public boolean effectiveBooleanValue​(XPathContext context)
                                throws XPathException

  Description copied from class: Expression
  Get the effective boolean value of the expression. This returns false if the value is the empty sequence, a zero-length string, a number equal to zero, or the boolean false. Otherwise it returns true.

  Overrides:

  effectiveBooleanValue in class Expression

  Parameters:

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

  Returns:

  the effective boolean value

  Throws:

  XPathException - if any dynamic error occurs evaluating the expression