Define a CSAR validator interface which all CSAR validators should implement.

The interface should have a method to check if the validator apply to the model.

A suggestion of interfaces for a singleton validator:

CsarValidator

ValidationResult validate(org.openecomp.core.utilities.file.FileContentHandler fileContentHandler) //the method that will validate the package and create the error list

boolean applyTo(String model) //if the validator applies for that model

 int getOrder() //to check the order of execution of the validator (maybe there is no meaning for this)

ValidationResult

boolean isValid() //if the package is valid

List<String> getErrors() //return the error messages during the validation