FileUtils.java

/*
 * HalfNES by Andrew Hoffman
 * Licensed under the GNU GPL Version 3. See LICENSE file
 */
package com.grapeshot.halfnes;

import java.awt.EventQueue;
import java.io.*;

/**
 *
 * @author Andrew
 */
public class FileUtils {
    
    private FileUtils() {}

    public static String getExtension(final File f) {
        return getExtension(f.getName());
    }

    public static String getExtension(final String s) {
        if (s == null || s.equals("")) {
            return "";
        }
        int split = s.lastIndexOf('.');
        if (split < 0) {
            return "";
        }
        return s.substring(split);

    }

    public static String stripExtension(final File f) {
        String s = f.getName();
        if (s == null || s.equals("")) {
            return "";
        }
        int split = s.lastIndexOf('.');
        if (split < 0) {
            return "";
        }
        return s.substring(0, split);
    }

    public static String stripExtension(final String s) {
        if (s == null || s.equals("")) {
            return "";
        }
        int split = s.lastIndexOf('.');
        if (split < 0) {
            return "";
        }
        return s.substring(0, split);
    }

    public static void writetofile(final int[] array, final String path) {
        //note: does NOT write the ints directly to the file - only the low bytes.
        AsyncWriter writer = new AsyncWriter(array, path);
        writer.run();
    }

    public static void asyncwritetofile(final int[] array, final String path) {
        //now does the file writing in the dispatch thread
        //hopefully that will eliminate annoying hitches when file system's slow
        //and not do pathological stuff like threads are prone to
        AsyncWriter writer = new AsyncWriter(array, path);
        EventQueue.invokeLater(writer);
    }

    private static class AsyncWriter implements Runnable {

        private final int[] a;
        private final String path;

        public AsyncWriter(final int[] a, final String path) {
            this.a = a;
            this.path = path;
        }

        @Override
        public void run() {
            if (a != null && path != null) {
                try {
                    FileOutputStream b = new FileOutputStream(path);
                    byte[] buf = new byte[a.length];
                    for (int i = 0; i < a.length; ++i) {
                        buf[i] = (byte) (a[i] & 0xff);
                    }
                    b.write(buf);
                    b.flush();
                    b.close();
                } catch (IOException e) {
                    System.err.print("Could not save. ");
                    System.err.println(e);
                }
            }
        }
    }

    public static String getFilenamefromPath(String path) {
        return new File(path).getName();
    }

    public static int[] readfromfile(final String path) {
        File f = new File(path);
        byte[] bytes = new byte[(int) f.length()];
        FileInputStream fis;
        try {
            fis = new FileInputStream(f);
                fis.read(bytes);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                System.err.println("Failed to load file");
            e.printStackTrace();
            }
        int[] ints = new int[bytes.length];

        for (int i = 0;
                i < bytes.length;
                i++) {
            ints[i] = (short) (bytes[i] & 0xFF);
        }

        return ints;
    }

    public static boolean exists(final String path) {
        File f = new File(path);
        return f.canRead() && !f.isDirectory();
    }
}