org.apache.xpath.operations
public abstract class UnaryOperation extends Expression implements ExpressionOwner
Method Summary | |
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void | callVisitors(ExpressionOwner owner, XPathVisitor visitor) |
boolean | canTraverseOutsideSubtree()
Tell if this expression or it's subexpressions can traverse outside
the current subtree.
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boolean | deepEquals(Expression expr) |
XObject | execute(XPathContext xctxt)
Execute the operand and apply the unary operation to the result.
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void | fixupVariables(Vector vars, int globalsSize)
This function is used to fixup variables from QNames to stack frame
indexes at stylesheet build time. |
Expression | getExpression() |
Expression | getOperand() |
abstract XObject | operate(XObject right)
Apply the operation to two operands, and return the result.
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void | setExpression(Expression exp) |
void | setRight(Expression r)
Set the expression operand for the operation.
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See Also: XPathVisitable
Returns: true if traversal outside the context node's subtree can occur.
See Also: deepEquals
Parameters: xctxt The runtime execution context.
Returns: An XObject that represents the result of applying the unary operation to the evaluated operand.
Throws: javax.xml.transform.TransformerException
Parameters: 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).
See Also: getExpression
Returns: the operand of unary operation, as an Expression.
Parameters: right non-null reference to the evaluated right operand.
Returns: non-null reference to the XObject that represents the result of the operation.
Throws: javax.xml.transform.TransformerException
See Also: setExpression
Parameters: r The expression operand to which the unary operation will be applied.