InputStream in = source();
InputStream wrapper = new InputStream() {
    @Override
    public int read() throws IOException {
        return 0;
    }

    @Override
    public int read(byte[] b) throws IOException {
        return in.read(b);

    }
};
sink(wrapper);

static class MyStream extends InputStream {
    private InputStream wrapped;

    MyStream(InputStream wrapped) {
        this.wrapped = wrapped;
    }

    @Override
    public int read() throws IOException {
        return 0;
    }

    @Override
    public int read(byte[] b) throws IOException {
        return wrapped.read(b);
    }
}

public static void test() {
  InputStream src = source();
  InputStream wrapper1 = new MyStream(src);
  InputStream wrapper2 = new MyStream(wrapper1);
  InputStream wrapper3 = new MyStream(wrapper2);
  sink(wrapper3);
}