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java.lang.Object | +--org.jaxen.SimpleVariableContext
Simple default implementation for VariableContext
.
This is a simple table-based key-lookup implementation
for VariableContext
which can be programmatically
extended by setting additional variables.
Constructor Summary | |
SimpleVariableContext()
Construct. |
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. |
void |
setVariableValue(String localName,
Object value)
Set the value associated with a variable. |
void |
setVariableValue(String namespaceURI,
String localName,
Object value)
Set the value associated with a variable. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public SimpleVariableContext()
Construct with an empty variable lookup table.
Method Detail |
public void setVariableValue(String namespaceURI, String localName, Object value)
This method sets a variable that is
associated with any particular namespace.
These variables appear such as $prefix:foo
in an XPath expression. Prefix to URI resolution
is the responsibility of a NamespaceContext
.
Variables within a VariableContext
are
refered to purely based upon their namespace URI,
if any.
namespaceURI
- The namespace URI of the variable.localName
- The local name of the variablevalue
- The value to be bound to the variable.public void setVariableValue(String localName, Object value)
This method sets a variable that is not
associated with any particular namespace.
These variables appear such as $foo
in an XPath expression.
localName
- The local name of the variablevalue
- The value to be bound to the variable.public Object getVariableValue(String namespaceURI, String prefix, String localName) throws UnresolvableException
VariableContext
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.
getVariableValue
in interface VariableContext
org.jaxen.VariableContext
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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