er.extensions.foundation
Class ERXArrayUtilities.UniqueOperator

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

All Implemented Interfaces:

com.webobjects.foundation.NSArray.Operator

Enclosing class:

ERXArrayUtilities

public static class ERXArrayUtilities.UniqueOperator
extends java.lang.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

ERXArrayUtilities.UniqueOperator()
public empty constructor

Method Summary

java.lang.Object	compute(com.webobjects.foundation.NSArray<?> array, java.lang.String keypath) Removes duplicates.
java.lang.Object	contents(com.webobjects.foundation.NSArray<?> array, java.lang.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

ERXArrayUtilities.UniqueOperator

public ERXArrayUtilities.UniqueOperator()

public empty constructor

Method Detail

compute

public java.lang.Object compute(com.webobjects.foundation.NSArray<?> array,
                                java.lang.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 java.lang.Object contents(com.webobjects.foundation.NSArray<?> array,
                                 java.lang.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