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


Copyright 2006 Apache XML Project. All Rights Reserved.