er.extensions.foundation

Class ERXArrayUtilities.UniqueOperator

java.lang.Object

er.extensions.foundation.ERXArrayUtilities.UniqueOperator

All Implemented Interfaces:

NSArray.Operator

Enclosing class:

ERXArrayUtilities

public static class ERXArrayUtilities.UniqueOperator
extends Object

Define an NSArray.Operator for the key unique.

This allows for key value paths like:

myArray.valueForKeyPath("@unique.someOtherPath");

Which in this case would return only those objects which are unique in myArray before continuing to process someOtherPath.

See Also:

BaseOperator

Constructor Summary

Constructors

Constructor and Description
UniqueOperator()

Method Summary

Modifier and Type	Method and Description
Object	compute(NSArray array, String keypath) Removes duplicates.
Object	contents(NSArray<?> array, String keypath) Rather than iterating through the array argument calling valueForKeyPath on each array object, this method operates by calling valueForKeyPath on the array argument instead.

Methods inherited from class java.lang.Object

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

Constructor Detail

UniqueOperator

public UniqueOperator()

Method Detail

compute

public Object compute(NSArray array,
                      String keypath)

Removes duplicates.

Parameters:

array - array to be uniqued.

keypath - the key path after removing duplicates from the array

Returns:

the value produced by following the keypath after removing duplicates

contents

public Object contents(NSArray<?> array,
                       String keypath)

Rather than iterating through the array argument calling valueForKeyPath on each array object, this method operates by calling valueForKeyPath on the array argument instead. This method is used by Wonder operators to chain multiple array operators in a single key path.

Parameters:

array - the array value for the operator

keypath - the keypath to call on the array argument

Returns:

the object value produced by valueForKeyPath, or the array itself if the keypath is empty