org.apache.xpath.operations
Class Neg

java.lang.Object
  |
  +--org.apache.xpath.Expression
        |
        +--org.apache.xpath.operations.UnaryOperation
              |
              +--org.apache.xpath.operations.Neg

public class Neg

extends UnaryOperation

The unary '-' operation expression executer.

See Also:

Serialized Form

Constructor Summary

Neg()

Method Summary

double	num(XPathContext xctxt) Evaluate this operation directly to a double.
XObject	operate(XObject right) Apply the operation to two operands, and return the result.

Methods inherited from class org.apache.xpath.operations.UnaryOperation

callVisitors, canTraverseOutsideSubtree, deepEquals, execute, fixupVariables, getExpression, getOperand, setExpression, setRight

Methods inherited from class org.apache.xpath.Expression

asIterator, asIteratorRaw, asNode, assertion, bool, error, execute, execute, execute, executeCharsToContentHandler, exprAddChild, exprGetChild, exprGetNumChildren, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isNodesetExpr, isStableNumber, warn, xstr

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Neg

public Neg()

Method Detail

operate

public XObject operate(XObject right)
                throws TransformerException

Apply the operation to two operands, and return the result.

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:

TransformerException -

Overrides:

operate in class UnaryOperation

num

public double num(XPathContext xctxt)
           throws TransformerException

Evaluate this operation directly to a double.

Parameters:

xctxt - The runtime execution context.

Returns:

The result of the operation as a double.

Throws:

TransformerException -

Overrides:

num in class Expression