org.apache.xpath.operations

Class Neg

java.lang.Object

org.apache.xpath.Expression

org.apache.xpath.operations.UnaryOperation

org.apache.xpath.operations.Neg

All Implemented Interfaces:

Serializable, SourceLocator, ExpressionNode, ExpressionOwner, XPathVisitable

public class Neg
extends UnaryOperation

The unary '-' operation expression executer.

See Also:

Serialized Form

Field Summary

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

m_right

Constructor Summary

Constructors

Constructor and Description
Neg()

Method Summary

Modifier and Type	Method and Description
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, isSameClass, isStableNumber, warn, xstr

Methods inherited from class java.lang.Object

clone, equals, finalize, 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.

Specified by:

operate in class 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.

Throws:

TransformerException

num

public double num(XPathContext xctxt)
           throws TransformerException

Evaluate this operation directly to a double.

Overrides:

num in class Expression

Parameters:

xctxt - The runtime execution context.

Returns:

The result of the operation as a double.

Throws:

TransformerException