org.apache.xpath.operations

Class Minus

java.lang.Object

org.apache.xpath.Expression

org.apache.xpath.operations.Operation

org.apache.xpath.operations.Minus

All Implemented Interfaces:

Serializable, SourceLocator, ExpressionNode, ExpressionOwner, XPathVisitable

public class Minus
extends Operation

The binary '-' operation expression executer.

See Also:

Serialized Form

Field Summary

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

m_left, m_right

Constructor Summary

Constructors

Constructor and Description
Minus()

Method Summary

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

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

callVisitors, canTraverseOutsideSubtree, deepEquals, execute, fixupVariables, getExpression, getLeftOperand, getRightOperand, setExpression, setLeftRight

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

Minus

public Minus()

Method Detail

operate

public XObject operate(XObject left,
                       XObject right)
                throws TransformerException

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

Overrides:

operate in class Operation

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:

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