Package net.sf.saxon.expr
Interface Binding
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- All Known Implementing Classes:
Assign
,Assignation
,EagerLetExpression
,ForExpression
,GeneralVariable
,GlobalParam
,GlobalVariable
,JAXPVariable
,LetExpression
,LocalParam
,LocalVariable
,PositionVariable
,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.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description ValueRepresentation
evaluateVariable(XPathContext context)
Evaluate the variableint
getLocalSlotNumber()
If this is a local variable held on the local stack frame, return the corresponding slot number.SequenceType
getRequiredType()
Get the declared type of the variableStructuredQName
getVariableQName()
Get the name of the variableboolean
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.
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Method Detail
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getRequiredType
SequenceType getRequiredType()
Get the declared type of the variable- Returns:
- the declared type
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evaluateVariable
ValueRepresentation evaluateVariable(XPathContext context) throws XPathException
Evaluate the variable- Parameters:
context
- the XPath dynamic evaluation context- Returns:
- the result of evaluating the variable
- Throws:
XPathException
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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.- Returns:
- true if the binding is global
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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.- Returns:
- true if the binding is assignable
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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.- Returns:
- the slot number on the local stack frame
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getVariableQName
StructuredQName getVariableQName()
Get the name of the variable- Returns:
- the name of the variable, as a structured QName
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