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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 | |
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; this value is ignored and has no effectlocalName - 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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