Package net.sf.saxon.expr.elab

Class UpdateElaborator

  • Direct Known Subclasses:
    Put.PutFnElaborator
    public abstract class UpdateElaborator
extends Elaborator
    Abstract evaluator for XQuery Update expressions. Most evaluation modes (pull, push, item) etc are not supported for such expressions, so the relevant methods throw an error. The concrete subclass must provide an Elaborator.elaborateForUpdate() method

    • Constructor Detail

      • UpdateElaborator

        public UpdateElaborator()

    • Method Detail

      • eagerly

        public SequenceEvaluator eagerly()
        Description copied from class: Elaborator
        Get a function that evaluates the underlying expression eagerly
        Overrides:
        eagerly in class Elaborator
        Returns:
        an evaluator for the expression that returns a GroundedValue. The class SequenceEvaluator is declared to return a Sequence not a GroundedValue; we can't specialize it because it's a limitation of C# delegates, but the result can safely be cast to GroundedValue.

      • elaborateForPush

        public PushEvaluator elaborateForPush()
        Description copied from class: Elaborator
        Get a function that evaluates the underlying expression in push mode, by writing events to an Outputter
        Specified by:
        elaborateForPush in class Elaborator
        Returns:
        an evaluator for the expression in push mode

      • elaborateForItem

        public ItemEvaluator elaborateForItem()
        Description copied from class: Elaborator
        Get a function that evaluates the underlying expression in the form of a Item. This must only be called for expressions whose result has cardinality zero or one.
        Specified by:
        elaborateForItem in class Elaborator
        Returns:
        an evaluator for the expression that returns an Item, or null to represent an empty sequence.

      • elaborateForBoolean

        public BooleanEvaluator elaborateForBoolean()
        Description copied from class: Elaborator
        Get a function that evaluates the underlying expression in the form of a boolean, this being the effective boolean value of the expression.
        Specified by:
        elaborateForBoolean in class Elaborator
        Returns:
        an evaluator for the expression that returns a boolean.

      • elaborateForUnicodeString

        public UnicodeStringEvaluator elaborateForUnicodeString​(boolean zeroLengthWhenAbsent)
        Description copied from class: Elaborator
        Get a function that evaluates the underlying expression in the form of a unicode string, this being the result of applying fn:string() to the result of the expression.
        Specified by:
        elaborateForUnicodeString in class Elaborator
        Parameters:
        zeroLengthWhenAbsent - if true, then when the result of the expression is an empty sequence, the result of the StringEvaluator should be a zero-length string. If false, the return value should be null. For an expression or function that never returns an empty sequence (for example, a call on string() or normalize-space()), the argument has no effect.
        Returns:
        an evaluator for the expression that returns a string.