Re: riddle me this (Nulls and committedSnapshotValueForKey)
Re: riddle me this (Nulls and committedSnapshotValueForKey)
- Subject: Re: riddle me this (Nulls and committedSnapshotValueForKey)
- From: Maik Musall <email@hidden>
- Date: Wed, 01 Aug 2012 17:14:13 +0200
Hi Theodore,
NSKeyValueCoding$Null is not null. You have to check against NSKeyValueCoding.NullValue.
Or generally use a utility method to cover everything, which surely exists somewhere in Wonder, or make your own. Suggestion:
public static boolean isNullOrEmpty( Object value ) {
if( value == null ) return true;
if( value == NSKeyValueCoding.NullValue ) return true;
if( value == JSONObject.NULL ) return true;
if( value instanceof String ) {
return ( ((String) value).trim().length() == 0);
} else if( value instanceof NSArray ) {
return ((NSArray) value).count() == 0;
} else if( value instanceof NSDictionary ) {
return ((NSDictionary) value).count() == 0;
} else if( value instanceof Collection ) {
return ((Collection) value).isEmpty();
} else if( value.getClass().isArray() ) { return Array.getLength( value ) == 0; }
return false;
}
Maik
Am 01.08.2012 um 17:01 schrieb Theodore Petrosky:
> if (committedSnapshotValueForKey(PROJECT_DESCRIPTION_KEY) == null) {
> NSLog.out.appendln(" == null ****** ");
> setOldPD("Null");
> } else {
> NSLog.out.appendln(" != null " + committedSnapshotValueForKey(PROJECT_DESCRIPTION_KEY));
> setOldPD("sdsd");
> //setOldPD((String) committedSnapshotValueForKey(PROJECT_DESCRIPTION_KEY));
> }
>
> if the old value is null I want to print something. but my error message is driving me to riddles.
>
> ERMODInspectPage - Configuration: EditProject - != null <com.webobjects.foundation.NSKeyValueCoding$Null>
>
> if the value was null why did this fall through to the else logic?
>
> API:
>
> Object er.extensions.eof.ERXEnterpriseObject.committedSnapshotValueForKey(String key)
>
> Determines what the value of the given key is in the committed snapshot
>
> Parameters:
> key to be checked in committed snapshot
> Returns:
> the committed snapshot value for the given key
>
> it says it returns a value, but when NULL returns com.webobjects.foundation.NSKeyValueCoding$Null
>
> And if when there is a value it returns: != null class class java.lang.String
>
> I guess I don't understand how to check for null.
>
> Ted
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