er.extensions.foundation

Class ERXArrayUtilities.IsEmptyOperator

java.lang.Object

er.extensions.foundation.ERXArrayUtilities.IsEmptyOperator

All Implemented Interfaces:

NSArray.Operator

Enclosing class:

ERXArrayUtilities

public static class ERXArrayUtilities.IsEmptyOperator
extends Object
implements NSArray.Operator

Define an NSArray.Operator for the key isEmpty.

This allows for key value paths like:

myArray.valueForKey("@isEmpty");

Which in this case would return true if the myArray.count() == 0, or false if it is not. This operator always ends computation. Any keypath following the isEmpty operator is simply ignored.

Constructor Summary

Constructors

Constructor and Description
IsEmptyOperator()

Method Summary

Modifier and Type	Method and Description
Object	compute(NSArray array, String keypath) returns true if the given array is empty, useful for WOHyperlink disabled binding.

Methods inherited from class java.lang.Object

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

Constructor Detail

IsEmptyOperator

public IsEmptyOperator()

Method Detail

compute

public Object compute(NSArray array,
                      String keypath)

returns true if the given array is empty, useful for WOHyperlink disabled binding.

Specified by:

compute in interface NSArray.Operator

Parameters:

array - array to be checked.

keypath - the keypath. This value is ignored.

Returns:

Boolean.TRUE if array is empty, Boolean.FALSE otherwise.