DoubleMeanValueAggregatorFunction (Apache Commons Functor 1.0-SNAPSHOT API)

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java.lang.Object
- org.apache.commons.functor.aggregator.functions.DoubleMeanValueAggregatorFunction

All Implemented Interfaces:

Function<List<Double>,Double>, Functor, UnaryFunctor<List<Double>>
```
public final class DoubleMeanValueAggregatorFunction
extends Object
implements Function<List<Double>,Double>
```
Aggregator function to be used with subclasses of AbstractListBackedAggregator which computes the arithmetic mean of all the numbers in the list.

- Constructor Summary
  
  Constructors
  Constructor and Description
  
  DoubleMeanValueAggregatorFunction()
- Method Summary
  
  Methods
  Modifier and Type Method and Description
  
  Double evaluate(List<Double> data)
  Does the actual computation and returns the result.
  
  String toString()
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - DoubleMeanValueAggregatorFunction
```
public DoubleMeanValueAggregatorFunction()
```
- Method Detail
  - evaluate
```
public Double evaluate(List<Double> data)
```
    Does the actual computation and returns the result. Please note that caller is responsible for synchronizing access to the list.
    
    Specified by:
    
    evaluate in interface Function<List<Double>,Double>
    
    Parameters:
    data - List to traverse and sum
    
    Returns:
    arithmetic mean (average) of all the data in the list or null if the list is empty.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

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