net.sf.saxon.expr
Interface Binding

All Known Implementing Classes:

Assign, Assignation, EagerLetExpression, ForExpression, GeneralVariable, GlobalParam, GlobalVariable, JAXPVariable, LetExpression, LocalParam, LocalVariable, QuantifiedExpression, UserFunctionParameter, WithParam, XPathVariable

public interface Binding

Binding is a interface used to represent the run-time properties and methods associated with a variable: specifically, a method to get the value of the variable.

Method Summary

ValueRepresentation	evaluateVariable(XPathContext context) Evaluate the variable
int	getLocalSlotNumber() If this is a local variable held on the local stack frame, return the corresponding slot number.
boolean	isAssignable() Test whether it is permitted to assign to the variable using the saxon:assign extension element.
boolean	isGlobal() Indicate whether the binding is local or global.

Method Detail

evaluateVariable

ValueRepresentation evaluateVariable(XPathContext context)
                                     throws XPathException

Evaluate the variable

Throws:

XPathException

isGlobal

boolean isGlobal()

Indicate whether the binding is local or global. A global binding is one that has a fixed value for the life of a query or transformation; any other binding is local.

isAssignable

boolean isAssignable()

Test whether it is permitted to assign to the variable using the saxon:assign extension element. This will only be for an XSLT global variable where the extra attribute saxon:assignable="yes" is present.

getLocalSlotNumber

int getLocalSlotNumber()

If this is a local variable held on the local stack frame, return the corresponding slot number. In other cases, return -1.