add FileUtil class

Author: SubOptimal

src/main/java/sub/optimal/util/FileUtil.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2014 suboptimal
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+package sub.optimal.util;
+
+import java.io.File;
+
+/**
+ *
+ * @author suboptimal
+ */
+public class FileUtil {
+
+    /**
+     * Check if the passed {@link File} points to an existing file and can be read by the user.
+     *
+     * @param file - file to be checked
+     * @return true - <code>file</code> point to a file and is readable<br>
+     * false - <code>file</file> is either a directory or is not readable
+     */
+    public static boolean isReadableFile(File file) {
+        if (!file.exists() || !file.isFile()) {
+            System.err.println(String.format("%s: does not exist", file.getName()));
+            return false;
+        }
+        if (!file.canRead()) {
+            System.err.println(String.format("%s: no read permission", file.getName()));
+            return false;
+        }
+        return true;
+    }
+}