org.apache.xpath.operations
Class Plus

java.lang.Object
  extended by org.apache.xpath.Expression
      extended by org.apache.xpath.operations.Operation
          extended by org.apache.xpath.operations.Plus
All Implemented Interfaces:
java.io.Serializable, javax.xml.transform.SourceLocator, ExpressionNode, ExpressionOwner, XPathVisitable

public class Plus
extends Operation

The '+' operation expression executer.

See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.xpath.operations.Operation
Operation.LeftExprOwner
 
Field Summary
(package private) static long serialVersionUID
           
 
Fields inherited from class org.apache.xpath.operations.Operation
m_left, m_right
 
Constructor Summary
Plus()
           
 
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, isSameClass, isStableNumber, warn, xstr
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

serialVersionUID

static final long serialVersionUID
See Also:
Constant Field Values
Constructor Detail

Plus

public Plus()
Method Detail

operate

public XObject operate(XObject left,
                       XObject right)
                throws javax.xml.transform.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:
javax.xml.transform.TransformerException

num

public double num(XPathContext xctxt)
           throws javax.xml.transform.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:
javax.xml.transform.TransformerException