org.opennms.netmgt.measurements.impl

Class SampleArrayFunctions

java.lang.Object

org.opennms.netmgt.measurements.impl.SampleArrayFunctions

public class SampleArrayFunctions
extends Object

Returns prior samples of given attribute from jexl context

Author:

cgallen

Constructor Summary

Constructors

Constructor and Description
SampleArrayFunctions(org.apache.commons.jexl2.JexlContext context) The context will be populated by jexl prior to expression execution

Method Summary

Modifier and Type	Method and Description
Double	arrayFirst(String sampleName, int n) Returns prior sample value of attribute 'sampleName' y = sample[i - n] If selected sample is before start of retrieved samples return first sample value sample[0]
Double	arrayNaN(String sampleName, int n) Returns prior sample value of attribute 'sampleName' y = sample[i - n] If selected sample is before start of retrieved samples return Not a Number (NaN)
Double	arrayStart(String sampleName, int n, double start) Returns prior sample value of attribute 'sampleName' y = sample[i - n] If selected sample is before start of retrieved samples return substitute sample value
Double	arrayZero(String sampleName, Integer n) Returns prior sample value of attribute 'sampleName' y = sample[i - n] If selected sample is before start of retrieved samples return zero (0)

Methods inherited from class java.lang.Object

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

Constructor Detail

SampleArrayFunctions

public SampleArrayFunctions(org.apache.commons.jexl2.JexlContext context)

The context will be populated by jexl prior to expression execution

Parameters:

context -

Method Detail

arrayZero

public Double arrayZero(String sampleName,
                        Integer n)

Returns prior sample value of attribute 'sampleName' y = sample[i - n] If selected sample is before start of retrieved samples return zero (0)

Parameters:

sampleName - name of attribute

i - number of samples prior to return

Returns:

sample n-i or Zero (0) if sample before start of received sequence. NaN if sampleName not in jexl context

arrayFirst

public Double arrayFirst(String sampleName,
                         int n)

Returns prior sample value of attribute 'sampleName' y = sample[i - n] If selected sample is before start of retrieved samples return first sample value sample[0]

Parameters:

sampleName - name of attribute

i - number of samples prior to return

Returns:

sample n-i or sample[0] if sample before start of received sequence. NaN if sampleName not in jexl context

arrayNaN

public Double arrayNaN(String sampleName,
                       int n)

Returns prior sample value of attribute 'sampleName' y = sample[i - n] If selected sample is before start of retrieved samples return Not a Number (NaN)

Parameters:

sampleName - name of attribute

i - number of samples prior to return

Returns:

sample n-i or not a number (NaN) if sample before start of received sequence. NaN if sampleName not in jexl context

arrayStart

public Double arrayStart(String sampleName,
                         int n,
                         double start)

Returns prior sample value of attribute 'sampleName' y = sample[i - n] If selected sample is before start of retrieved samples return substitute sample value

Parameters:

sampleName - name of attribute

i - number of samples prior to return

start - replace references before start of samples with this value

Returns:

sample n-i or substitute if sample before start of received sequence. NaN if sampleName not in jexl context