er.extensions.foundation
Class ERXArrayUtilities.MedianOperator

java.lang.Object
  er.extensions.foundation.ERXArrayUtilities.MedianOperator

All Implemented Interfaces:

NSArray.Operator

Enclosing class:

ERXArrayUtilities

public static class ERXArrayUtilities.MedianOperator
extends Object

Define an NSArray.Operator for the key median.

This allows for key value paths like:

myArray.valueForKey("@median.someMorePath");

which return the median of the array elements at the given key path. The median is the value for which half of the elements are above and half the elements are below. As such, an array sort is needed and this might be very costly depending of the size of the array.

Constructor Summary

ERXArrayUtilities.MedianOperator()
public empty constructor

Method Summary

Object	compute(NSArray array, String keypath) returns the median value for the values of the keypath.
NSArray	contents(NSArray array, String keypath)

Methods inherited from class java.lang.Object

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

Constructor Detail

ERXArrayUtilities.MedianOperator

public ERXArrayUtilities.MedianOperator()

public empty constructor

Method Detail

compute

public Object compute(NSArray array,
                      String keypath)

returns the median value for the values of the keypath.

Parameters:

array - array to be checked.

keypath - value of reverse.

Returns:

reversed array for keypath.

contents

public NSArray contents(NSArray array,
                        String keypath)