CODEWITHSUNDEEP
javafilteringfilenames
XtremeBaumer
XtremeBaumer

Reputation: 6435

Java expand FilenameFilter

I have a method where upon calling a FilenameFilter is passed to (as anonymous inner class). Now, if a variable is set, I want to extend the FilenameFilter. Example:

new FilenameFilter() {

    @Override
    public boolean accept(File dir, String name) {
        return name.toLowerCase().endsWith(".txt");
    }
}

Should become:

new FilenameFilter() {

    @Override
    public boolean accept(File dir, String name) {
        return name.toLowerCase().endsWith(".txt") || new File(dir, name).isDirectory();
    }
}

How can I get the filtering from the first filter and add the directory check? (I don't want to implement the FilenameFilter with directories upon calling the method, because it might not be needed at all)

Solution based upon accepted answer. filenameFilter is the instance passed to the method:

new FilenameFilter() {

    @Override
    public boolean accept(File dir, String name) {
        return filenameFilter.accept(dir, name) || new File(dir, name).isDirectory();
    }
};

Upvotes: 1

Views: 213

Answers (1)

Evgeniy Dorofeev
Evgeniy Dorofeev

Reputation: 135992

You should extends the first filter:

class FilenameFilter1 implements FilenameFilter {
    @Override
    public boolean accept(File dir, String name) {
        return name.toLowerCase().endsWith(".txt");
    }
}

class FilenameFilter2 extends FilenameFilter1 {
    @Override
    public boolean accept(File dir, String name) {
        return super.accept(dir, name) && new File(dir, name).isDirectory();
    }
}

Upvotes: 1

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