Problem with filter

[lezhik]

I want to write some class which must print some info. It contains an OutputStream to print this info, but I'd like to pass FilterOutputStream as a parameter to print method. How can I realize something like this?

 

[sedj]

>>>> FilterOutputStream as a parameter to print method.

I don't think this is possible - filter streams sit on top of instantiated IO streams to perform "filtering". You cannot pass them to print methods.

Here is an example of creating a FilterOutputStream -

FileOutputStream fos = new FileOutputStream("afile.txt");
FilterOutputStream fios = new FilterOutputStream(fos);
fios.write(1);
fios.write(2);
fios.flush();
fios.close();
fos.close();

 

[lezhik]

I need to pass filter method to print in some way, is it possible? Using of FilterOutputStream isn't necessary.

 

[sedj]

>>>> Using of FilterOutputStream isn't necessary

But in your first post, you said you needed to use the FilterOutputStream ???!!!

>>>>> need to pass filter method to print in some way

What does this mean ?? Filter what ?

 

[lezhik]

>>>But in your first post, you said you needed to use the FilterOutputStream ???!!!

It's better to do it with using FilterOutputStream, but the using of FilterOutputStream isn't necessary.

>>>Filter what ?

One of class metods writes some data to OutputStream (the stream is a class member), and want to filter this data. It'll be great if filter could be passed to print method as a parameter.

 

[sedj]

Can you not filter the data before you pass it to the OutputStream ?

As I said earlier, there are no standard methods to pass a "filter" to a print/write method of streams. Your only choice is to write a custom class that extends an OutputStream to do this, and override the print/write methods.

 

[lezhik]

Maybe class could be generated by it's name? I have code which using class Class do it. If it so maybe filter class name should be passed to function. But I don't know : is this solution is really good?

 

[sedj]

I don't follow ...