Design pattern for default implementation with empty methods

Question

Is there a specific design pattern that describes the scenario where a non-abstract default implementation is provided that implements all or some of the method

Answer 1

Great question.

I have started using NoOp as a class name prefix for this pattern. It's short, clear, and not overloaded (like Empty [contains nothing?], Null [Null Object pattern, which is different?], Abstract [Does it provide some implementation?], or Base [Does it provide some implementation?]).

I may write this style of class when I have a third-party API which provides "Hooks" for isntrumentation during a complex operation. Consider the following two classes provided by a library:

public class LongRunningActionRunner {
    public void runSomethingLong(DecisionListener cdh) {
        // ...
    }
}

public interface DecisionListener {
    public void beforeFooHook();
    public void afterFooHook();
    public void beforeBarHook();
    public void afterBarHook();
    public void beforeBazHook();
    public void afterBazHook();
}

In this case, you might right a class using this pattern like this:

public class NoOpDecisionListener implements DecisionListener {
    @Override public Something beforeFooHook() {}
    @Override public Something afterFooHook() {}
    @Override public Something beforeBarHook() {}
    @Override public Something afterBarHook() {}
    @Override public Something beforeBazHook() {}
    @Override public Something afterBazHook() {}
}