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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.UnaryExpression
net.sf.saxon.expr.TailCallLoop
A TailCallLoop wraps the body of a function that contains tail-recursive function calls. On completion of the "real" body of the function it tests whether the function has executed a tail call, and if so, iterates to evaluate the tail call.
| Field Summary |
| Fields inherited from class net.sf.saxon.expr.UnaryExpression |
operand |
| Fields inherited from class net.sf.saxon.expr.ComputedExpression |
locationId, staticProperties |
| Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
| Constructor Summary | |
TailCallLoop(UserFunction function)
Constructor |
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| Method Summary | |
protected java.lang.String |
displayOperator(Configuration config)
Give a string representation of the operator for use in diagnostics |
Item |
evaluateItem(XPathContext context)
Evaluate as an Item. |
int |
getImplementationMethod()
An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process(). |
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the items returned by the expression |
SequenceIterator |
iterate(XPathContext context)
Iterate over the sequence of values |
void |
process(XPathContext context)
Process the function body |
Expression |
simplify(StaticContext env)
Simplify an expression |
Expression |
typeCheck(StaticContext env,
ItemType contextItemType)
Type-check the expression |
| Methods inherited from class net.sf.saxon.expr.UnaryExpression |
computeCardinality, computeSpecialProperties, display, equals, getBaseExpression, hashCode, iterateSubExpressions, optimize, promote, replaceSubExpression |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public TailCallLoop(UserFunction function)
| Method Detail |
public Expression simplify(StaticContext env)
throws XPathException
simplify in interface Expressionsimplify in class UnaryExpressionXPathException
public Expression typeCheck(StaticContext env,
ItemType contextItemType)
throws XPathException
typeCheck in interface ExpressiontypeCheck in class UnaryExpressionXPathExceptionpublic int getImplementationMethod()
getImplementationMethod in interface ExpressiongetImplementationMethod in class ComputedExpression
public SequenceIterator iterate(XPathContext context)
throws XPathException
iterate in interface Expressioniterate in class ComputedExpressioncontext - supplies the context for evaluation
XPathException - if any dynamic error occurs evaluating the
expression
public Item evaluateItem(XPathContext context)
throws XPathException
evaluateItem in interface ExpressionevaluateItem in class ComputedExpressioncontext - The context in which the expression is to be evaluated
XPathException - if any dynamic error occurs evaluating the
expression
public void process(XPathContext context)
throws XPathException
process in interface Expressionprocess in class ComputedExpressioncontext - The dynamic context, giving access to the current node,
the current variables, etc.
XPathExceptionpublic ItemType getItemType(TypeHierarchy th)
getItemType in interface ExpressiongetItemType in class UnaryExpressionth -
protected java.lang.String displayOperator(Configuration config)
displayOperator in class UnaryExpressionconfig -
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