HistogramBuilder (apache-cassandra API)

java.lang.Object
- org.apache.cassandra.utils.HistogramBuilder

```
public class HistogramBuilder
extends java.lang.Object
```
Simple class for constructing an EsimtatedHistogram from a set of predetermined values

Field Summary

Fields
Modifier and Type Field Description

static long[] EMPTY_LONG_ARRAY

static long[] ZERO

Constructor Summary

Constructors
Constructor Description

HistogramBuilder()

HistogramBuilder(long[] values)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(long value)`
`EstimatedHistogram`	`buildWithStdevRangesAroundMean()`	See `buildWithStdevRangesAroundMean(int)`
`EstimatedHistogram`	`buildWithStdevRangesAroundMean(int maxdevs)`	Calculate the min, mean, max and standard deviation of the items in the builder, and generate an EstimatedHistogram with upto `maxdev` stdev size ranges either side of the mean, until min/max are hit; if either min/max are not reached a further range is inserted at the relevant ends.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - EMPTY_LONG_ARRAY
```
public static final long[] EMPTY_LONG_ARRAY
```
  - ZERO
```
public static final long[] ZERO
```
- Constructor Detail
  - HistogramBuilder
```
public HistogramBuilder()
```
  - HistogramBuilder
```
public HistogramBuilder(long[] values)
```
- Method Detail
  - add
```
public void add(long value)
```
  - buildWithStdevRangesAroundMean
```
public EstimatedHistogram buildWithStdevRangesAroundMean()
```
    See buildWithStdevRangesAroundMean(int)
    
    Returns:
    
    buildWithStdevRangesAroundMean(3)
  - buildWithStdevRangesAroundMean
```
public EstimatedHistogram buildWithStdevRangesAroundMean(int maxdevs)
```
    Calculate the min, mean, max and standard deviation of the items in the builder, and generate an EstimatedHistogram with upto maxdev stdev size ranges either side of the mean, until min/max are hit; if either min/max are not reached a further range is inserted at the relevant ends. e.g., with a maxdevs of 3, there may be up to 8 ranges (between 9 boundaries, the middle being the mean); the middle 6 will have the same size (stdev) with the outermost two stretching out to min and max.
    
    Parameters:
    
    maxdevs -
    
    Returns: