/*

  * This file is part of dependency-check-core.

  *

  * Dependency-check-core 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 3 of the License, or (at your option) any

  * later version.

  *

  * Dependency-check-core 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

  * dependency-check-core. If not, see http://www.gnu.org/licenses/.

  *

  * Copyright (c) 2012 Jeremy Long. All Rights Reserved.

  */

 package org.owasp.dependencycheck.utils;

 import java.io.File;

 import java.io.FileNotFoundException;

 import java.io.IOException;

 import java.io.UnsupportedEncodingException;

 import java.net.URLDecoder;

 /**

  * A collection of utilities for processing information about files.

  *

  * @author Jeremy Long (jeremy.long@owasp.org)

  */

 public final class FileUtils {

     /**

      * Private constructor for a utility class.

      */

     private FileUtils() {

     }

     /**

      * Returns the (lowercase) file extension for a specified file.

      *

      * @param fileName the file name to retrieve the file extension from.

      * @return the file extension.

      */

     public static String getFileExtension(String fileName) {

         String ret = null;

         final int pos = fileName.lastIndexOf(".");

         if (pos >= 0) {

             ret = fileName.substring(pos + 1, fileName.length()).toLowerCase();

         }

         return ret;

     }

     /**

      * Deletes a file. If the File is a directory it will recursively delete the

      * contents.

      *

      * @param file the File to delete

      * @throws IOException is thrown if the file could not be deleted

      */

     public static void delete(File file) throws IOException {

         if (file.isDirectory()) {

             for (File c : file.listFiles()) {

                 delete(c);

             }

         }

         if (!file.delete()) {

             throw new FileNotFoundException("Failed to delete file: " + file);

         }

     }

     /**

      * Returns the data directory. If a path was specified in

      * dependencycheck.properties or was specified using the Settings object,

      * and the path exists, that path will be returned as a File object. If it

      * does not exist, then a File object will be created based on the file

      * location of the JAR containing the specified class.

      *

      * @param configuredFilePath the configured relative or absolute path

      * @param clazz the class whos path will be resolved

      * @return a File object

      * @throws IOException is thrown if the path could not be decoded

      * @deprecated This method should no longer be used. See the implementation

      * in dependency-check-cli/App.java to see how the data directory should be

      * set.

      */

     @java.lang.Deprecated

     public static File getDataDirectory(String configuredFilePath, Class clazz) throws IOException {

         final File file = new File(configuredFilePath);

         if (file.isDirectory() && file.canWrite()) {

             return new File(file.getCanonicalPath());

         } else {

             final File exePath = getPathToJar(clazz);

             return new File(exePath, configuredFilePath);

         }

     }

     /**

      * Retrieves the physical path to the parent directory containing the

      * provided class. For example, if a JAR file contained a class

      * org.something.clazz this method would return the parent directory of the

      * JAR file.

      *

      * @param clazz the class to determine the parent directory of

      * @return the parent directory of the file containing the specified class.

      * @throws UnsupportedEncodingException thrown if UTF-8 is not supported.

      * @deprecated this should no longer be used.

      */

     @java.lang.Deprecated

     public static File getPathToJar(Class clazz) throws UnsupportedEncodingException {

         final String filePath = clazz.getProtectionDomain().getCodeSource().getLocation().getPath();

         final String decodedPath = URLDecoder.decode(filePath, "UTF-8");

         final File jarPath = new File(decodedPath);

         return jarPath.getParentFile();

     }

 }