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Resolves variable bindings within an XPath expression.
Variables within an XPath expression are denoted using
notation such as $varName
or
$nsPrefix:varName
, and may
refer to a Boolean
, Double
, String
,
node-set (List
) or individual XML node.
When a variable is bound to a node-set, the
actual Java object returned should be a java.util.List
containing XML nodes from the object-model (e.g. dom4j, JDOM, DOM, etc.)
being used with the XPath.
A variable may validly be assigned the null
value,
but an unbound variable (one that this context does not know about)
should cause an UnresolvableException
to be thrown.
SimpleVariableContext
,
NamespaceContext
Method Summary | |
java.lang.Object |
getVariableValue(java.lang.String namespaceURI,
java.lang.String prefix,
java.lang.String localName)
An implementation should return the value of an XPath variable based on the namespace URI and local name of the variable-reference expression. |
Method Detail |
public java.lang.Object getVariableValue(java.lang.String namespaceURI, java.lang.String prefix, java.lang.String localName) throws UnresolvableException
It must not use the prefix parameter to select a variable, because a prefix could be bound to any namespace; the prefix parameter could be used in debugging output or other generated information. The prefix may otherwise be ignored.
namespaceURI
- the namespace URI to which the prefix parameter
is bound in the XPath expression. If the variable
reference expression had no prefix, the namespace
URI is null
.prefix
- the prefix that was used in the variable reference
expressionlocalName
- the local name of the variable-reference
expression. If there is no prefix, then this is
the whole name of the variable.
null
)
UnresolvableException
- when the variable cannot be resolved
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