org.apache.xpath.operations
public class Operation 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 a binary operation by calling execute on each of the operands,
and then calling the operate method on the derived class.
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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 | getLeftOperand() |
Expression | getRightOperand() |
XObject | operate(XObject left, XObject right)
Apply the operation to two operands, and return the result.
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void | setExpression(Expression exp) |
void | setLeftRight(Expression l, Expression r)
Set the left and right operand expressions for this 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: The XObject result of the operation.
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 left operand of binary operation, as an Expression.
Returns: the right operand of binary operation, as an Expression.
Parameters: left non-null reference to the evaluated left operand. 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: l The left expression operand. r The right expression operand.