Package net.sf.saxon.expr.elab

Interface Summary

Interface	Description
BooleanEvaluator	Interface implemented by expressions that return a boolean result.
ItemEvaluator	Interface implemented by classes that evaluate an expression to deliver a single item
Pingable	A Pingable represents an object that can receive an event with no associated information.
PullEvaluator	Interface implemented by evaluators that evaluate an expression in "pull" mode, that is, by delivering a SequenceIterator over the results.
PushEvaluator
SequenceEvaluator
StringEvaluator	A StringEvaluator is a function that typically encapsulates the logic for evaluating an expression that returns a string.
UnicodeStringEvaluator	A StringEvaluator is a function that typically encapsulates the logic for evaluating an expression that returns a string, in the form of a UnicodeString
UpdateEvaluator	Interface implemented by XQuery Update expressions, to evaluate an update expression by adding update primitives to a supplied pending update list.

Class Summary

Class	Description
BooleanElaborator	Abstract superclass for elaborators whose primary evaluation method is to return a single boolean.
ComplexNodePushElaborator	Elaborator for element construction expressions (both fixed and computed).
EagerPullEvaluator	A SequenceEvaluator that evaluates an expression eagerly, in pull mode.
EagerPushEvaluator	A SequenceEvaluator that evaluates an expression eagerly, in push mode.
Elaborator	This class is at the heart of the mechanism for elaborating expressions.
FallbackElaborator	The FallbackElaborator performs elaboration of expressions for which no more specific elaborator is available.
IndexedVariableEvaluator	Evaluator for a variable that needs to be indexed, because the optimizer has identified that it will contain a sequence that is accessed using predicates based on the content Note, indexing is only used in Saxon-EE; the implementation in Saxon-HE is a dummy.
ItemElaborator	An ItemElaborator is an abstract superclass for use by expressions that deliver zero or one items as their result.
LazyPullEvaluator	SequenceEvaluator that evaluates an expression lazily in pull mode; that is, it delivers a LazySequence which defers actual evaluation until the value is actually needed.
LearningEvaluator	A LearningEvaluator initially performs lazy incremental evaluation of an expression; but if this proves unproductive, it switches after a while to eager evaluation.
LiteralEvaluator	A SequenceEvaluator for literals.
LocalVariableEvaluator
MemoClosureEvaluator	A MemoClosureEvaluator is a SequenceEvaluator that evaluates an expression lazily and incrementally; it evaluates new items in the result as and when they are needed.
OptionalItemEvaluator	A SequenceEvaluator for expressions that return a sequence of zero or one items.
PullElaborator	Abstract implementation of Elaborator for expressions that primarily evaluate in pull mode, that is, by returning a SequenceIterator over the result.
PushElaborator	Abstract superclass for elaborators whose primary evaluation method is in push mode.
SharedAppendEvaluator	Evaluator for expressions that are evaluated in "shared append" mode.
SimpleNodePushElaborator	Abstract elaborator for expressions that evaluate simple nodes (text nodes, comments, attributes, etc) in push mode.
SingleItemEvaluator	A SequenceEvaluator for expressions that return a single item (exactly one, never an empty sequence).
StreamingArgumentEvaluator	Elaborator for the first argument of a streamable stylesheet function
StringElaborator	An abstract Elaborator for expressions that evaluate their result as a single string (that is, as an instance of UnicodeString); they may also return null to indicate that the result is an empty sequence.
UpdateElaborator	Abstract evaluator for XQuery Update expressions.