[Updater] more refactoring

Mage.Updater/src/main/java/com/magefree/update/helpers/FileHelper.java

@@ -0,0 +1,118 @@
+package com.magefree.update.helpers;
+
+import java.io.*;
+import java.net.HttpURLConnection;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Helper for file operations.
+ *
+ * @author noxx
+ */
+public class FileHelper {
+
+    private FileHelper() {
+    }
+
+    /**
+     * Filters out dirs.
+     */
+    private static final FilenameFilter anyFileFilter = new FilenameFilter() {
+        @Override
+        public boolean accept(File dir, String name) {
+            return dir.isFile();
+        }
+    };
+
+    /**
+     * Filters out jars.
+     */
+    private static final FilenameFilter jarFileFilter = new FilenameFilter() {
+        @Override
+        public boolean accept(File dir, String name) {
+            return name.endsWith(".jar");
+        }
+    };
+
+    /**
+     * Gets .jar files from specified folder.
+     *
+     * @param dir Folder to scan for rile
+     * @return
+     */
+    public static List<File> findJarsInDir(String dir) {
+        ArrayList<File> result = new ArrayList<File>();
+        File directory = new File(dir);
+        if (directory.exists() && directory.isDirectory()) {
+            for (File jar : directory.listFiles(jarFileFilter)) {
+                result.add(jar);
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Gets non-dir files from specified folder.
+     *
+     * @param dir Folder to scan for rile
+     * @return
+     */
+    public static List<File> findAllFilesInDir(String dir) {
+        ArrayList<File> result = new ArrayList<File>();
+        File directory = new File(dir);
+        if (directory.exists() && directory.isDirectory()) {
+            for (File jar : directory.listFiles(anyFileFilter)) {
+                result.add(jar);
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Removes all files from the list.
+     *
+     * @param files
+     */
+    public static void removeFiles(List<String> files) {
+        for (String filename : files) {
+            File f = new File(filename);
+            if (f.exists()) {
+                f.delete();
+                System.out.println("File has been deleted: " + filename);
+            } else {
+                System.out.println("ERROR. Couldn't find file to delete: " + filename);
+            }
+        }
+    }
+
+    /**
+     * Downloads specified file.
+     *
+     * @param filename
+     * @param urlConnection
+     */
+    public static void downloadFile(String filename, HttpURLConnection urlConnection) {
+        System.out.println("Downloading " + filename);
+        try {
+            InputStream in = urlConnection.getInputStream();
+            File f = new File(filename);
+            if (!f.exists()) {
+                f.getParentFile().mkdirs();
+                System.out.println("Directories have been created: " + f.getParentFile().getPath());
+            }
+
+            FileOutputStream out = new FileOutputStream(filename);
+            byte[] buf = new byte[4 * 1024];
+            int bytesRead;
+
+            while ((bytesRead = in.read(buf)) != -1) {
+                out.write(buf, 0, bytesRead);
+            }
+
+            System.out.println("File has been updated: " + filename);
+        } catch (IOException e) {
+            System.out.println("i/o exception - " + e.getMessage());
+        }
+    }
+}