CODEWITHSUNDEEP
javagenerics
FazoM
FazoM

Reputation: 4956

Checking type of generic class

I have an interface:

public interface IValidator<E extends IEntity>
{
    void validate(final E entity);
}

I would like to create a ValidatorService class, something like this:

public class ValidatorService
{
    private List<IValidator<IEntity>> validators;


    public void validate(IEntity e)
    {
        for(IValidator<IEntity> validator : this.validators)
        {
            //if( instanceof )???
            validator.validate(e);
        }
    }
}

How can I make sure that validators are applied only to their corresponding classes (please see '???' in code)? I.e.: if we have entity of type EntityA, then only validator IValidator will be invoked? I think I lack some knowledge of generics.. Thanks

Upvotes: 0

Views: 75

Answers (1)

SLaks
SLaks

Reputation: 888303

Due to type erasure, this is not possible.

Instead, you can add a Class<E> getEntityClass() method to the interface.

Upvotes: 4

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