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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 primitive types (Boolean, Number or String),
node-sets
or individual XML nodes.
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 (dom4j, JDOM, DOM, EXML)
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 | |
Object |
getVariableValue(String namespaceURI,
String prefix,
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 Object getVariableValue(String namespaceURI, String prefix, 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
expression.localName
- 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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