DirectoriesOnlyFilter.java

package edu.stanford.hci.r3.util.files.filters;

import java.io.File;
import java.io.FileFilter;

import edu.stanford.hci.r3.util.files.FileUtils;
import edu.stanford.hci.r3.util.files.Visibility;

public class DirectoriesOnlyFilter implements FileFilter {

        private boolean useVisibility = true;

        private Visibility visibility = Visibility.VISIBLE;

        public DirectoriesOnlyFilter(boolean useVisibilityFlag) {
                useVisibility = useVisibilityFlag;
        }

        public DirectoriesOnlyFilter(Visibility v) {
                visibility = v;
        }

        public boolean accept(File f) {
                if (!f.isDirectory()) {
                        // this is a file; we keep only directories
                        return false;
                }

                if (!useVisibility) {
                        // we don't check the flag
                        return true;
                }

                // we check the visibility flag here
                // only true if visibility matches the specification
                // invisible && hidden works
                // visible && !hidden works
                // both && (hidden || !hidden) works
                if (visibility == Visibility.BOTH) {
                        return true;
                }
                return (visibility == Visibility.INVISIBLE) == FileUtils.isHiddenOrDotFile(f);
        }
}

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