private String resolveAttribute(SimpleAttributeDefinition attr, OperationContext context, ModelNode model) throws OperationFailedException {
        final ModelNode node = attr.resolveModelAttribute(context, model);
        return node.isDefined() ? node.asString() : null;
    }
private String resolveAttribute(SimpleAttributeDefinition attr, OperationContext context, ModelNode model) throws OperationFailedException {
        final ModelNode node = attr.resolveModelAttribute(context, model);
        return node.isDefined() ? node.asString() : null;
    }
private String resolveAttribute ( SimpleAttributeDefinition attr , OperationContext context , ModelNode model ) throws OperationFailedException { final ModelNode node = attr . resolveModelAttribute ( context , model ) ; return node . isDefined ( ) ? node . asString ( ) : null ; }
Return null if the resolved attribute is not defined
Return null if the resolved attribute is not defined