org.rrd4j.graph

## Class CDef

- java.lang.Object
- - org.rrd4j.graph.Source
  - - org.rrd4j.graph.CDef

-     class CDef
      extends Source

  Represents a computed data source (CDEF) in RRD graphs. A CDEF evaluates a Reverse Polish Notation (RPN) expression to compute values from other data sources. Enables mathematical operations and data transformations within the graphing system.

- - ### Field Summary

    - ### Fields inherited from class org.rrd4j.graph.Source

      `name`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `CDef(String name, String rpnExpression)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `(package private) void` | `requestData(DataProcessor dproc)` Requests data from this source and provides it to the data processor.

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

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

- - ### Constructor Detail

    - #### CDef

          CDef(String name,
               String rpnExpression)

  - ### Method Detail

    - #### requestData

          void requestData(DataProcessor dproc)

      Description copied from class: `Source`
      Requests data from this source and provides it to the data processor.
      Specified by:
        `requestData` in class `Source`
      Parameters:
        `dproc` - the data processor to receive the data