Wonder: ERXValueUtilities.isNull(obj)
Am 01.08.2012 um 17:14 schrieb Maik Musall:
> 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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