Dynamic iteration over collection of files

[najort]

Hi
Let's assume that I have collection of files. That collection of files my vary in future, there might be .class .xml .config etc. I would like to do some task for every of mentioned files. For example for .xml I would like to parse that file, for .config I would like to browse for some properties etc. My goal is to have that open for future changes without modifying previously created methods. My ideal solution is to add new methods (classes) for comming new types of file.


public List getListFiles(Zi pEntry entry) {
.............
return listFiles;
}

public void doSthWithFiles( List<File> listFiles) {
//here is my issue. I don't want to change that method
every time new file extension is comming. I would like
to do that by adding new method (class) without midifying that
method
}

Kind Regards
najort

[JosAH]

Hi
Let's assume that I have collection of files. That collection of files my vary in future, there might be .class .xml .config etc. I would like to do some task for every of mentioned files. For example for .xml I would like to parse that file, for .config I would like to browse for some properties etc. My goal is to have that open for future changes without modifying previously created methods. My ideal solution is to add new methods (classes) for comming new types of file.


public List getListFiles(Zi pEntry entry) {
.............
return listFiles;
}

public void doSthWithFiles( List<File> listFiles) {
//here is my issue. I don't want to change that method
every time new file extension is comming. I would like
to do that by adding new method (class) without midifying that
method
}

Kind Regards
najort

How about a factory that delivers 'Tasks' given the file extensions. A 'Task' would
be an interface:

[code=java]
public interface Task {
public void process(File file);
}
[/code]

The factory itself could consult a .properties file like this:

xml   = com.utils.XmlProcessor
txt   = com.utils.TextProcessor
# etc.

Given the extension of the file the factory obtains the name of the corresponding
class (Class.forName( name).newInstan ce()) and returns it as a Task; voila, you
can add new classes for new file extensions. All you have to do is write the class
and list it in the .properties file.

kind regards,

Jos

[najort]

Great Thanks
This is the solution I was waiting for.
Very quick and good.
Thanks again