com.orchestranetworks.schema

Interface ConstraintOnNull

public interface ConstraintOnNull

Defines a verification for values that are mandatory under certain circumstances.

Data model definition and life cycle

Any implementation of this interface must also implement the Constraint interface. As such, its data model declaration and its life cycle are the same as Constraint.

Restriction policy

As this interface serves as a restriction of the static data model constraint minOccurs, the method checkNull(ValueContextForValidation) is only called under the following conditions:

Data model definition	Perform checkNull()
minOccurs="0" and maxOccurs="1"	If no value is defined (null) and the dataset is activated
minOccurs > 0	No
maxOccurs > 1	No

NOTE: By default, constraints on null value are not checked on user input. In order to enable this check, the osd:checkNullInput property must be set and if the element is terminal, the dataset must also be activated.

See Also:

Constraint

Method Summary

Modifier and Type	Method and Description
void	checkNull(ValueContextForValidation aValidationContext) This method performs a check when no value is defined; adds error message if necessary.

Method Detail

checkNull

void checkNull(ValueContextForValidation aValidationContext)
        throws InvalidSchemaException

This method performs a check when no value is defined; adds error message if necessary.

Parameters:

aValidationContext - the context

Throws:

InvalidSchemaException - if a dynamic condition in the data model prevents the execution of this method.