com.softwareag.mdm.schema
Interface ConstraintOnNull

public interface ConstraintOnNull

Defines a check for values that become mandatory under certain circumstances.

Schema definition and life-cycle

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

Restriction policy

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

Schema definition	Perform checkNull()
minOccurs="0" and maxOccurs="1"	if no value is defined (this is null) and instance is activated
minOccurs > 0	never (not applicable)
maxOccurs > 1	never (not applicable)

See Also:

Constraint

Method Summary

void	checkNull(ValueContextForValidation aValidationContext) This method performs a check when no value is defined and it adds an error message if needed.

Method Detail

checkNull

public void checkNull(ValueContextForValidation aValidationContext)
               throws InvalidSchemaException

This method performs a check when no value is defined and it adds an error message if needed.

See this class comment that specifies when this method is called.

Parameters:

aValidationContext - the context

Throws:

InvalidSchemaException - if some schema's dynamic condition prevents the execution of this method.