Package net.sf.saxon.expr.elab

Class BooleanElaborator

java.lang.Object
net.sf.saxon.expr.elab.Elaborator
net.sf.saxon.expr.elab.BooleanElaborator
Direct Known Subclasses:
AndExpression.AndElaborator, BooleanFn.BooleanFnElaborator, CompareToIntegerConstant.CompareToIntegerConstantElaborator, CompareToStringConstant.CompareToStringConstantElaborator, Contains.ContainsFnElaborator, GeneralComparison.GeneralComparisonElaborator, InstanceOfExpression.InstanceOfElaborator, IntegerRangeTest.IntegerRangeTestElaborator, IsLastExpression.IsLastElaborator, Matches.MatchesFnElaborator, NotFn.NotFnElaborator, OrExpression.OrElaborator, QuantifiedExpression.QuantifiedExprElaborator
public abstract class BooleanElaborator extends Elaborator
Abstract superclass for elaborators whose primary evaluation method is to return a single boolean. This class provides olternative modes of evaluation (such as pull and item evaluation), all implemented in terms of the boolean evaluator which must be supplied in a subclass.

  • Constructor Details

    • BooleanElaborator

      public BooleanElaborator()

  • Method Details

    • elaborateForPull

      public PullEvaluator elaborateForPull()
      Description copied from class: Elaborator
      Get a function that evaluates the underlying expression in the form of a SequenceIterator
      Specified by:
      elaborateForPull in class Elaborator
      Returns:
      an evaluator for the expression that returns a SequenceIterator

    • 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 abstract 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.