org.rrd4j.data

Class CDef

java.lang.Object

org.rrd4j.data.Source

org.rrd4j.data.CDef

All Implemented Interfaces:

NonRrdSource

class CDef
extends Source
implements NonRrdSource

RRD CDEF (Computed Data Source Definition) implementation.
Creates computed data sources using Reverse Polish Notation (RPN) expressions on existing data sources.

Field Summary

Fields inherited from class org.rrd4j.data.Source

timestamps, values

Constructor Summary

Constructors

Constructor and Description
CDef(String name, String rpnExpression)

Method Summary

Modifier and Type	Method and Description
void	calculate(long tStart, long tEnd, DataProcessor dataProcessor) Calculates values for the specified time range.
(package private) String	getRpnExpression()

Methods inherited from class org.rrd4j.data.Source

getName, getTimestamps, getValues, setTimestamps, setValues

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

calculate

public void calculate(long tStart,
                      long tEnd,
                      DataProcessor dataProcessor)

Calculates values for the specified time range.

Specified by:

calculate in interface NonRrdSource

Parameters:

tStart - start time for calculation

tEnd - end time for calculation

dataProcessor - DataProcessor object for accessing other data sources

getRpnExpression

String getRpnExpression()