net.sf.saxon.xpath
public class XPathFunctionCall extends FunctionCall
Constructor Summary | |
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XPathFunctionCall(XPathFunction function)
Default constructor |
Method Summary | |
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PathMap.PathMapNodeSet | addToPathMap(PathMap pathMap, PathMap.PathMapNodeSet pathMapNodeSet)
Add a representation of this expression to a PathMap. |
protected SequenceIterator | call(ValueRepresentation[] argValues, XPathContext context)
Call an extension function previously identified using the bind() method. |
void | checkArguments(ExpressionVisitor visitor)
Method called by the expression parser when all arguments have been supplied |
int | computeCardinality()
Determine the cardinality of the result |
Expression | copy()
Copy an expression. |
int | getIntrinsicDependencies()
Determine which aspects of the context the expression depends on. |
ItemType | getItemType(TypeHierarchy th)
Determine the data type of the expression, if possible. |
SequenceIterator | iterate(XPathContext context)
Evaluate the function. |
Expression | preEvaluate(ExpressionVisitor visitor)
preEvaluate: this method suppresses compile-time evaluation by doing nothing
(because the external function might have side-effects and might use the context) |
The default implementation of this method assumes that an expression does no navigation other than the navigation done by evaluating its subexpressions, and that the subexpressions are evaluated in the same context as the containing expression. The method must be overridden for any expression where these assumptions do not hold. For example, implementations exist for AxisExpression, ParentExpression, and RootExpression (because they perform navigation), and for the doc(), document(), and collection() functions because they create a new navigation root. Implementations also exist for PathExpression and FilterExpression because they have subexpressions that are evaluated in a different context from the calling expression.
Parameters: pathMap the PathMap to which the expression should be added pathMapNodeSet
Returns: the pathMapNode representing the focus established by this expression, in the case where this expression is the first operand of a path expression or filter expression. For an expression that does navigation, it represents the end of the arc in the path map that describes the navigation route. For other expressions, it is the same as the input pathMapNode.
Parameters: argValues The values of the arguments context The XPath dynamic context
Returns: The value returned by the extension function
Returns: ZERO_OR_MORE (we don't know)
Returns: the copy of the original expression
This method will always return a result, though it may be the best approximation that is available at the time.
Parameters: th the type hierarchy cache
Returns: the item type
Parameters: context The context in which the function is to be evaluated
Returns: a Value representing the result of the function.
Throws: XPathException if the function cannot be evaluated.
Parameters: visitor an expression visitor