Package org.rrd4j.data
Class Variable
java.lang.Object
org.rrd4j.data.Variable
- Direct Known Subclasses:
Variable.AVERAGE
,Variable.FIRST
,Variable.LAST
,Variable.LSLCORREL
,Variable.LSLINT
,Variable.LSLSLOPE
,Variable.MAX
,Variable.MIN
,Variable.PERCENTILE
,Variable.STDDEV
,Variable.TOTAL
An abstract class to help extract single value from a set of value (VDEF in rrdtool)
It can be used to add new fancy statistical calculation with rrd values
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Nested Class Summary
Modifier and TypeClassDescriptionstatic class
Calculate the average of the data points.(package private) static final class
The sort used by rrdtool for percent, where NaN < -INF < finite values < INFstatic class
Find the first valid data point and it's timestampstatic class
Find the first last valid point and it's timestampstatic class
Calculate the correlation coefficient of the least squares line.static class
Calculate the y-intercept of the least squares line.static class
Calculate the slop of the least squares line.static class
The biggest of the data points and it's time stamp (the first one) is stored.static class
The smallest of the data points and it's time stamp (the first one) is stored.(package private) static final class
Store all the informations about a datasource point, for predictive and consistent sortingstatic class
Find the point at the n-th percentile.static class
static class
Calculate the standard deviation for the data point.static class
Calculate the sum of the data points.static final class
This class store both the value and the time stamp It will be used by graph rendering legend -
Field Summary
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescription(package private) void
Used to calculate the needed value from a source, this method call the abstract methodfill(long[], double[], long, long)
.protected abstract Variable.Value
fill
(long[] timestamps, double[] values, long start, long end) This method is call with the needed values, extracted from the datasource to do the calculation.getValue()
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Field Details
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INVALIDVALUE
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Constructor Details
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Variable
public Variable()
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Method Details
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calculate
Used to calculate the needed value from a source, this method call the abstract methodfill(long[], double[], long, long)
.- Parameters:
s
-start
-end
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getValue
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fill
This method is call with the needed values, extracted from the datasource to do the calculation. Value is to be filled with both the double value and a possible timestamp, when it's used to find a specific point- Parameters:
timestamps
- the timestamps for the valuevalues
- the actual valuesstart
- the start of the periodend
- the end of the period- Returns:
- a filled Value object
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