er.extensions.foundation
Class ERXArrayUtilities.IsEmptyOperator

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

All Implemented Interfaces:

com.webobjects.foundation.NSArray.Operator

Enclosing class:

ERXArrayUtilities

public static class ERXArrayUtilities.IsEmptyOperator
extends java.lang.Object
implements com.webobjects.foundation.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

ERXArrayUtilities.IsEmptyOperator()
public empty constructor

Method Summary

java.lang.Object

compute(com.webobjects.foundation.NSArray<?> array, java.lang.String keypath) returns true if the given array is empty, usefull for WOHyperlink disabled binding.

Methods inherited from class java.lang.Object

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

Constructor Detail

ERXArrayUtilities.IsEmptyOperator

public ERXArrayUtilities.IsEmptyOperator()

public empty constructor

Method Detail

compute

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

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

Specified by:

compute in interface com.webobjects.foundation.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.