org.apache.xpath.operations

Class Neg

Implemented Interfaces:
ExpressionNode, ExpressionOwner, java.io.Serializable, SourceLocator, XPathVisitable

public class Neg
extends UnaryOperation

The unary '-' operation expression executer.
See Also:
Serialized Form

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, operate, setExpression, setRight

Methods inherited from class org.apache.xpath.Expression

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

Method Details

num

public double num(XPathContext xctxt)
            throws javax.xml.transform.TransformerException
Evaluate this operation directly to a double.
Overrides:
num in interface Expression
Parameters:
xctxt - The runtime execution context.
Returns:
The result of the operation as a double.

operate

public XObject operate(XObject right)
            throws javax.xml.transform.TransformerException
Apply the operation to two operands, and return the result.
Overrides:
operate in interface UnaryOperation
Parameters:
right - non-null reference to the evaluated right operand.
Returns:
non-null reference to the XObject that represents the result of the operation.

Copyright B) 2005 Apache XML Project. All Rights Reserved.