import java.io.*;
import java.lang.reflect.*;
import javax.servlet.ServletResponse;
import net.sf.cglib.*;

public class LazyLoader {
    public static OutputStream getOutputStream(final ServletResponse response) {
        MethodInterceptor mi = new MethodInterceptor() {
            private Object delegate;
            public Object intercept(Object obj, Method method,
                                    Object[] args, MethodProxy proxy)
            throws Throwable {
                if (delegate == null)
                    delegate = response.getOutputStream();
                return proxy.invoke(delegate, args);
            }
        };
        return (OutputStream)Enhancer.enhance(OutputStream.class, null, mi, null, null,
                                              new ModifierFilter(Modifier.PROTECTED, 0));
    }
}