Util.java

/*
 * Universal Password Manager
 * Copyright (C) 2005-2013 Adrian Smith
 *
 * This file is part of Universal Password Manager.
 *   
 * Universal Password Manager is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Universal Password Manager is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Universal Password Manager; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package com._17od.upm.util;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;

import javax.swing.ImageIcon;


public class Util {

    /**
     * Left pad an integer to a given length with the given
     * character 
     * @param i The integer to pad
     * @param length The length to pad it to
     * @param c The character to do the padding with
     * @return A padded version of the integer
     */
    public static String lpad(int i, int length, char c) {
        StringBuffer buf = new StringBuffer(String.valueOf(i));
        while (buf.length() < length) {
            buf.insert(0, c);
        }
        return buf.toString();
    }

    
    public static ImageIcon loadImage(String name) {
        URL imageURL = Util.class.getResource("images/" + name);
        return new ImageIcon(imageURL);
    }


    public static void copyFile(File srcFile, File destFile) throws IOException {
        FileChannel sourceChannel = null;
        FileChannel destinationChannel = null;
        try {
            sourceChannel = new FileInputStream(srcFile).getChannel();
            destinationChannel = new FileOutputStream(destFile).getChannel();
            destinationChannel.transferFrom(sourceChannel, 0, sourceChannel.size());
        } finally {
            if (sourceChannel != null) {
                sourceChannel.close();
            }
            if (destinationChannel != null) {
                destinationChannel.close();
            }
        }
    }

    public static Charset defaultCharset() {
        return Charset.forName(
                new OutputStreamWriter(
                        new ByteArrayOutputStream()).getEncoding());
    }

    public static boolean isNumeric(String s) {
        try {
            Integer.parseInt(s);
        } catch(NumberFormatException e) {
            return false;
        }
        return true;
      }

}