org.apache.xpath.operations
Class UnaryOperation
- ExpressionNode, ExpressionOwner, Serializable, SourceLocator, XPathVisitable
public abstract class UnaryOperation
The unary operation base class.
asIterator , asIteratorRaw , asNode , assertion , bool , canTraverseOutsideSubtree , deepEquals , error , execute , execute , execute , execute , executeCharsToContentHandler , exprAddChild , exprGetChild , exprGetNumChildren , exprGetParent , exprSetParent , fixupVariables , getColumnNumber , getExpressionOwner , getLineNumber , getPublicId , getSystemId , isNodesetExpr , isStableNumber , num , warn , xstr |
canTraverseOutsideSubtree
public boolean canTraverseOutsideSubtree()
Tell if this expression or it's subexpressions can traverse outside
the current subtree.
- canTraverseOutsideSubtree in interface Expression
- true if traversal outside the context node's subtree can occur.
execute
public XObject execute(XPathContext xctxt)
throws TransformerException
Execute the operand and apply the unary operation to the result.
- execute in interface Expression
xctxt
- The runtime execution context.
- An XObject that represents the result of applying the unary
operation to the evaluated operand.
fixupVariables
public void fixupVariables(Vector vars,
int globalsSize)
This function is used to fixup variables from QNames to stack frame
indexes at stylesheet build time.
- fixupVariables in interface Expression
vars
- List of QNames that correspond to variables. This list
should be searched backwards for the first qualified name that
corresponds to the variable reference qname. The position of the
QName in the vector from the start of the vector will be its position
in the stack frame (but variables above the globalsTop value will need
to be offset to the current stack frame).
getOperand
public Expression getOperand()
- the operand of unary operation, as an Expression.
operate
public abstract XObject operate(XObject right)
throws TransformerException
Apply the operation to two operands, and return the result.
right
- non-null reference to the evaluated right operand.
- non-null reference to the XObject that represents the result of the operation.
setRight
public void setRight(Expression r)
Set the expression operand for the operation.
r
- The expression operand to which the unary operation will be
applied.
Copyright B) 2004 Apache XML Project. All Rights Reserved.