class UnionExpression extends NodeSetExpression
Modifier and Type | Field and Description |
---|---|
protected Expression |
p1 |
protected Expression |
p2 |
staticContext
Constructor and Description |
---|
UnionExpression(Expression p1,
Expression p2)
Constructor
|
Modifier and Type | Method and Description |
---|---|
void |
display(int level)
Diagnostic print of expression structure
|
NodeEnumeration |
enumerate(Context c,
boolean sort)
Evaluate the union expression.
|
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 dependencies,
Context context)
Perform a partial evaluation of the expression, by eliminating specified dependencies
on the context.
|
Expression |
simplify()
Simplify an expression
|
evaluate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsString, getDataType, outputStringValue, selectFirst
containsReferences, evaluateAsNumber, getStaticContext, indent, make, setStaticContext, usesCurrent
protected Expression p1
protected Expression p2
public UnionExpression(Expression p1, Expression p2)
p1
- the left-hand operandp2
- the right-hand operandpublic Expression simplify() throws XPathException
simplify
in class Expression
XPathException
public NodeEnumeration enumerate(Context c, boolean sort) throws XPathException
enumerate
in class NodeSetExpression
c
- The context for evaluationsort
- Request the nodes in document order (they will be, regardless)XPathException
- when the expression does not return a nodeset.public int getDependencies()
getDependencies
in class Expression
public boolean isContextDocumentNodeSet()
isContextDocumentNodeSet
in class Expression
public Expression reduce(int dependencies, Context context) throws XPathException
reduce
in class Expression
dependencies
- The dependencies to be removedcontext
- The context to be used for the partial evaluationXPathException
public void display(int level)
display
in class Expression