Interface XPathVariableResolver
public interface XPathVariableResolver
XPathVariableResolver provides access to the set of user defined XPath variables.
The XPathVariableResolver and the XPath evaluator must adhere to a contract that
 cannot be directly enforced by the API.  Although variables may be mutable,
 that is, an application may wish to evaluate the same XPath expression more
 than once with different variable values, in the course of evaluating any
 single XPath expression, a variable's value must
 not change.
- Since:
- 1.5
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Method SummaryModifier and TypeMethodDescriptionresolveVariable(QName variableName) Find a variable in the set of available variables.
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Method Details- 
resolveVariableFind a variable in the set of available variables. If variableNameisnull, then aNullPointerExceptionis thrown.- Parameters:
- variableName- The- QNameof the variable name.
- Returns:
- The variables value, or nullif no variable namedvariableNameexists. The value returned must be of a type appropriate for the underlying object model.
- Throws:
- NullPointerException- If- variableNameis- null.
 
 
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