org.apache.xpath.operations

## Class Plus

- java.lang.Object
- - org.apache.xpath.Expression
  - - org.apache.xpath.operations.Operation
    - - org.apache.xpath.operations.Plus

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

      public class Plus
      extends Operation

  The '+' operation expression executer.
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `Plus()`

  - ### Method Summary

    Methods
    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, isStableNumber, warn, xstr`

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### Plus

          public Plus()

  - ### 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`

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