有没有办法在Eclipse中自动生成包装器？

Question

I have to create several proxies, to add, for example, logging. Something like that:

interface IMath {
    public int add(a, b);
}

class Math implements IMath {
    public int add(a, b) { return a + b; }
}

class MathWithLogs implements IMath {
    private IMath realMath;
    public int add(a, b) {
        Log.d("tag", "valueable info");
        return realMath.add(a, b);
    }
}

Everything is fine as long as these interfaces aren't 20 methods and I have to add something to just one.

My question is, is there a way to autogenerate wrapper classes with some plugin for eclipse?

Or maybe there is a way to do something with annotations to invoke methods from realMath unless stated otherwise (like @Override)?

Answer 1

Right click in any source file (.java) and navigate to source -> Override/Implement Methods/Generate Delegate Methods.

The first will paste the body of all methods of your immediate interface. the second will do the same for all the hierarchy up to Object(I guess, not sure). Hope this helps.

Answer 2

是的，有一个名为“生成委托方法”的源生成器，它将完全按照您的要求执行。

Answer 3

It took me a while after reading the other answers to work out exactly what to do. The solution is:

1. Create your (initially empty) wrapper class which implements the required interface. Make sure to uncheck "Inherited abstract methods" when creating the class.
2. Inside your new wrapper class (which will show an error at the moment due to the fact that it lacks the interface implementations), create a field which has type equal to the required interface.
3. Right click the field you just created and select Source -> Generate Delegate Methods.
4. Check the methods you want to create and click OK.
5. Finally, add a single-arg constructor or a setter method for the field (it's not automatically generated as part of this process).