org.apache.xpath.operations
Class Minus

java.lang.Object
  |
  +--org.apache.xpath.Expression
        |
        +--org.apache.xpath.operations.Operation
              |
              +--org.apache.xpath.operations.Minus

public class Minus

extends Operation

The binary '-' operation expression executer.

See Also:

Serialized Form

Constructor Summary

Minus()

Method Summary

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, isStableNumber, warn, xstr

Methods inherited from class java.lang.Object

equals, 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.

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 -

Overrides:

operate in class Operation

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