id:masataka_k:20060215 からのインスパイア。

public class ClassTmpl {
  private String _member;
  public Clazz(String test) {
    _member = test;
  }
  public String template() {
    return _member != null ? _member : "";
  }  
}

public class Mixin {
  private String _member;
  public void setMember(String member) {
    this._member = member;
  }
}
class ?clazz
    name ClassTmpl
    declares template() as ?method
apply(?clazz, ?method)

void process(ASTClass c, ASTMethod m) {
    ClassFragment fc = FragmentFactory.cloneOf(c);
    fc.replaceName("Hoge");

    MethodFragment fm = fc.getMethod(m);
    fm.replaceName("foo");

    MethodFragment setter = FragmentFactory.createMethod("Mixin.setMember(java.lang.String)");
    fc.addMethod(setter);

    fc.deploy();
}

こんな勢いですかね。