Strategy Design Pattern, Generics and TypeSafety

Question

I want to create the following Strategy Pattern combined with Factory, but I want it to be typesafe. I have done the following till now:

public interface Parser&         


        

Answer 1

I usually use this format. I know that a lot of people does not like it but no one suggested a better approach so far.

public enum ParserType {
    APARSER(new AParser());

    private Parser parser; // this should be an interface which is implemented by AParser

    private ParseType(Parser parser){
        this.parser = parser;
    }

    public Parser getParserInstance() {
        return parser;
    }

}

You can pass Class objects around if you want a new instance every time:

public enum ParserType {
    APARSER(AParser.class);

    private Class parserClass;

    private ParseType(Class parserClass){
        this.parserClass = parserClass;
    }

    public Parser createParser() {
        return parserClass.newInstance(); // TODO: handle exceptions here
    }

}

Note: I'm eager to find a better approach so if you have some thoughts please share them in a comment.