Simple file browser interface.

FileBrowser.java

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package przyklady;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import java.util.TreeSet;

/**
 *
 * @author student
 */
public class FileBrowser implements Serializable, Comparable<FileBrowser> {

    private Set<FileBrowser> files;
    private String filename;
    private Date modified;
    long size;
    Type type;

    @Override
    public int compareTo(FileBrowser o) {
        return this.filename.compareTo(o.filename);
    }

    public enum Type {

        FILE,
        DIR;

        @Override
        public String toString() {
            switch (this) {
                case FILE:
                    return "F";
                case DIR:
                    return "D";
            }
            return null;
        }
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final FileBrowser other = (FileBrowser) obj;
        if (this.files != other.files && (this.files == null || !this.files.equals(other.files))) {
            return false;
        }
        if ((this.filename == null) ? (other.filename != null) : !this.filename.equals(other.filename)) {
            return false;
        }
        if (this.modified != other.modified && (this.modified == null || !this.modified.equals(other.modified))) {
            return false;
        }
        if (this.size != other.size) {
            return false;
        }
        if (this.type != other.type) {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 89 * hash + (this.filename != null ? this.filename.hashCode() : 0);
        hash = 89 * hash + (this.modified != null ? this.modified.hashCode() : 0);
        hash = 89 * hash + (int) (this.size ^ (this.size >>> 32));
        return hash;
    }

    @Override
    public String toString() {
        String ret = "";
        String prefix = ">";
        SimpleDateFormat format =
                new SimpleDateFormat("yyyy-MM-d HH:mm");
        ret += String.format("%s %s %d\n", prefix + filename, type, size, format.format(modified));
        for (FileBrowser f : files) {
            ret += f.toString(prefix);
        }
        return ret;
    }

    public String toString(String prefix) {
        String ret = "";
        prefix += ">";
        SimpleDateFormat format =
                new SimpleDateFormat("yyyy-MM-d HH:mm");

        ret += String.format("%s %s %d %s\n", prefix + filename, type, size, format.format(modified));
        for (FileBrowser f : files) {
            ret += f.toString(prefix);
        }
        return ret;
    }

    public FileBrowser() {
    }

    public FileBrowser(String[] opts) {
        files = opts[1].equals("sorted") ? new TreeSet<FileBrowser>() : new HashSet<FileBrowser>();
        File f = new File(opts[0]);
        filename = f.getName();
        modified = new Date(f.lastModified());
        size = f.isFile() ? f.length() : f.list().length;
        type = f.isFile() ? FileBrowser.Type.FILE : FileBrowser.Type.DIR;

        if (f.isDirectory()) {
            for (String file : f.list()) {
                String[] newOpts = new String[3];
                newOpts[0] = opts[0] + "/" + file;
                newOpts[1] = opts[1];
                FileBrowser nextFile = new FileBrowser(newOpts);
                files.add(nextFile);
            }
        }
    }

    public static void main(String[] args) throws Exception {
        FileBrowser f = null;
//        f = new FileBrowser(args);
//
//        ObjectOutputStream oos = null;
//        FileOutputStream fos = new FileOutputStream("car.ser");
//        oos = new ObjectOutputStream(fos);
//        oos.writeObject(f);

        ObjectInputStream ois = null;
        FileInputStream fis = new FileInputStream("car.ser");
        ois = new ObjectInputStream(fis);
        f = (FileBrowser) ois.readObject();


        System.out.println(f);


    }
}