/*
 * Converter.java
 *
 * Created on February 12, 2007, 3:57 PM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

//package appletconverter;

import java.io.*;
import java.util.Vector;
/**
 *Reads all java files in a directory specified by the users and removes 
all instances of package.
 *
 * @author Matt DesVoigne
 */
public class Converter {
    
    public static final String OMITSTRING = "package";
    
    private FilenameFilter filter;
    private File[] files;
    private String directory;
    
    /**
     * Creates a new instance of Converter
     */
    public Converter(String directory) {
        filter = new FilenameFilter() {
            public boolean accept(File dir, String name) {
                return (name.endsWith("java") /*|| (new File(dir, 
name).isDirectory())*/);
            }
        };
        
        this.directory = directory;
        
        File dir = new File(directory);
        System.out.println("Directory is " + dir.getAbsolutePath());
        if (!dir.isDirectory()) {
            throw new IllegalArgumentException("Converter: No such directory: " + dir.getAbsolutePath());
        }
        
        // Get the filtered file names.
        files = dir.listFiles(filter);
        /*
        for (int i=0; i < files.length; i++) {
            System.out.println(files[i].getAbsolutePath());
        }
         */
    }
    
    /**
     *For each file in the list of file names, remove any lines which when 
trimmed start with the word "package."
     */
    
    public void editFiles() {
        for (int i=0; i < files.length; i++) {
            // Read the contents of each file into a vector, omitting any lines beginning with the word "package."
            Vector lines = new Vector();
            BufferedReader in;
            try {
                in = new BufferedReader(
                        new InputStreamReader(
                        new BufferedInputStream(
                        new FileInputStream(files[i]))));
            } catch (FileNotFoundException fnfe) {
                System.out.println("The file: " + 
files[i].getAbsolutePath() + " cannot be found.  Returning empty galaxsee.");
                return;
            }
            
            String input;
            try {
                while ((input = in.readLine()) != null) {
                    if (!input.trim().startsWith(OMITSTRING)) { // Ignore any lines which begin with the word "package."
                        lines.addElement(input);
                    }
                }
            } catch (IOException ioe) {
                System.out.println("ERROR: Parsing data file " + 
files[i].getAbsolutePath());
                System.out.println(ioe.getMessage());
                ioe.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
            
            try {
                in.close();
            } catch (IOException ioe) {
                System.out.println("Error closing files[i].");
                System.out.println(ioe.getMessage());
                ioe.printStackTrace();
            }
            
            // Now write the contents of the lines vector back to the file.
            PrintWriter out;
            try {
                out = new PrintWriter(
                        new BufferedOutputStream(
                        new FileOutputStream(files[i])));
            } catch (FileNotFoundException fnfe) {
                System.out.println("Error saving file: File Not Found:" + 
files[i].getAbsolutePath() + ", " + fnfe.getMessage());
                fnfe.printStackTrace();
                return;
            }
            try {
                for (int j=0; j<lines.size(); j++) {
                    out.println((String)lines.elementAt(j));
                }
                out.flush();
                out.close();
            } catch (Exception ioe) {
                System.out.println("Could not write data file: " + 
files[i].getAbsolutePath() + ", " + ioe.getMessage());
                ioe.printStackTrace();
            }
            System.out.println("Removed package instances from " + 
files[i].getAbsolutePath());
        }
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        Converter myConverter = null;
        
        String directory = null;
        
        if (args.length != 1) usage();
        directory = args[0];
        if (directory == null) directory = System.getProperty("user.dir");
        
        (myConverter = new Converter(directory)).editFiles();
    }
    
    /**
     *Notify user of proper usage and exit.
     */
    public static void usage() {
        System.out.println("Usage: java Converter [applet_directory].  Try again.");
        System.exit(0);
    }
}