class FilterExpression extends NodeSetExpression
staticContext
Constructor | Description |
---|---|
FilterExpression(Expression start,
Expression filter) |
Constructor
|
Modifier and Type | Method | Description |
---|---|---|
void |
display(int level) |
Diagnostic print of expression structure
|
NodeEnumeration |
enumerate(Context context,
boolean sort) |
Evaluate the filter expression in a given context to return a Node Enumeration
|
int |
getDependencies() |
Determine which aspects of the context the expression depends on.
|
boolean |
isContextDocumentNodeSet() |
Determine, in the case of an expression whose data type is Value.NODESET,
whether all the nodes in the node-set are guaranteed to come from the same
document as the context node.
|
Expression |
reduce(int dep,
Context context) |
Perform a partial evaluation of the expression, by eliminating specified dependencies
on the context.
|
Expression |
simplify() |
Simplify an expression
|
containsReferences, evaluateAsNumber, getStaticContext, indent, make, setStaticContext, usesCurrent
evaluate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsString, getDataType, outputStringValue, selectFirst
public FilterExpression(Expression start, Expression filter)
start
- A node-set expression denoting the absolute or relative set of nodes from which the
navigation path should start.filter
- An expression defining the filter predicatepublic Expression simplify() throws XPathException
simplify
in class Expression
XPathException
public NodeEnumeration enumerate(Context context, boolean sort) throws XPathException
enumerate
in class NodeSetExpression
context
- the evaluation contextsort
- true if the result must be in document orderXPathException
- when the expression does not return a nodeset.public int getDependencies()
getDependencies
in class Expression
public Expression reduce(int dep, Context context) throws XPathException
reduce
in class Expression
dep
- The dependencies to be removedcontext
- The context to be used for the partial evaluationXPathException
public boolean isContextDocumentNodeSet()
isContextDocumentNodeSet
in class Expression
public void display(int level)
display
in class Expression