AccountsSelector.apxc

public class AccountsSelector extends fflib_SObjectSelector {
	
    public List<Schema.SObjectField> getSObjectFieldList() {
        return new List<Schema.SObjectField> {
            Account.ID, Account.Description, Account.Name, Account.AnnualRevenue
        };
    }
    
    public Schema.SObjectType getSObjectType() {
        return Account.SObjectType;
    }
    
    public List<Account> selectById(Set<ID> idSet) {
        List<Account> acctList = new List <Account>();
        acctList = (List<Account>) selectSObjectsById(idSet);
        return acctList;        
    }
}