Improves utility code

src/main/java/net/knarcraft/ffmpegconverter/utility/FFMpegHelper.java

@@ -35,6 +35,79 @@ public final class FFMpegHelper {
         return parseStreams(ffprobePath, probeForStreams(ffprobePath, file), file);
     }
 
+    /**
+     * Creates a list containing all required arguments for converting a video to a web playable video
+     *
+     * @param executable <p>The executable to use (ffmpeg/ffprobe).</p>
+     * @param fileName   <p>The name of the file to execute on.</p>
+     * @return <p>A base list of ffmpeg commands for converting a video for web</p>
+     */
+    public static List<String> getFFMpegWebVideoCommand(String executable, String fileName) {
+        List<String> command = getFFMpegGeneralFileCommand(executable, fileName);
+        command.add("-vcodec");
+        command.add("h264");
+        command.add("-pix_fmt");
+        command.add("yuv420p");
+        command.add("-ar");
+        command.add("48000");
+        command.add("-movflags");
+        command.add("+faststart");
+        return command;
+    }
+
+    /**
+     * Creates a list containing command line arguments for a general file
+     *
+     * @param executable <p>The executable to use (ffmpeg/ffprobe).</p>
+     * @param fileName   <p>The name of the file to execute on.</p>
+     * @return <p>A base list of ffmpeg commands for converting a file.</p>
+     */
+    public static List<String> getFFMpegGeneralFileCommand(String executable, String fileName) {
+        List<String> command = new ArrayList<>();
+        command.add(executable);
+        command.add("-nostdin");
+        command.add("-i");
+        command.add(fileName);
+        return command;
+    }
+
+    /**
+     * Adds debugging parameters for only converting parts of a file
+     *
+     * @param command <p>The list containing the command to run.</p>
+     * @param start   <p>The offset before converting.</p>
+     * @param length  <p>The offset for stopping the conversion.</p>
+     */
+    public static void addDebugArguments(List<String> command, int start, int length) {
+        command.add("-ss");
+        command.add("" + start);
+        command.add("-t");
+        command.add("" + length);
+    }
+
+    /**
+     * Starts and prints output of a process
+     *
+     * @param process <p>The process to run.</p>
+     * @param folder  <p>The folder the process should run in.</p>
+     * @throws IOException <p>If the process can't be readProcess.</p>
+     */
+    public static void convertProcess(ProcessBuilder process, File folder) throws IOException {
+        OutputUtil.print("Command to be run: ");
+        OutputUtil.println(process.command().toString());
+        process.directory(folder);
+        process.redirectErrorStream(true);
+        Process processConvert = process.start();
+        BufferedReader readerConvert = new BufferedReader(new InputStreamReader(processConvert.getInputStream()));
+        while (processConvert.isAlive()) {
+            String read = readProcess(readerConvert, "\n");
+            if (!read.equals("")) {
+                OutputUtil.println(read);
+            }
+        }
+        OutputUtil.println("Process finished.");
+    }
+
     /**
      * Gets a list of all streams in a file
      *
@@ -129,29 +202,6 @@ public final class FFMpegHelper {
         return parsedStreams;
     }
 
-    /**
-     * Starts and prints output of a process
-     *
-     * @param process <p>The process to run.</p>
-     * @param folder  <p>The folder the process should run in.</p>
-     * @throws IOException <p>If the process can't be readProcess.</p>
-     */
-    public static void convertProcess(ProcessBuilder process, File folder) throws IOException {
-        OutputUtil.print("Command to be run: ");
-        OutputUtil.println(process.command().toString());
-        process.directory(folder);
-        process.redirectErrorStream(true);
-        Process processConvert = process.start();
-        BufferedReader readerConvert = new BufferedReader(new InputStreamReader(processConvert.getInputStream()));
-        while (processConvert.isAlive()) {
-            String read = readProcess(readerConvert, "\n");
-            if (!read.equals("")) {
-                OutputUtil.println(read);
-            }
-        }
-        OutputUtil.println("Process is finished.");
-    }
-
     /**
      * Reads from a process reader
      *
@@ -168,56 +218,6 @@ public final class FFMpegHelper {
         return text.toString().trim();
     }
 
-    /**
-     * Creates a list containing all required arguments for converting a video to a web playable video
-     *
-     * @param executable <p>The executable to use (ffmpeg/ffprobe).</p>
-     * @param fileName   <p>The name of the file to execute on.</p>
-     * @return <p>A base list of ffmpeg commands for converting a video for web</p>
-     */
-    public static List<String> getFFMpegWebVideoCommand(String executable, String fileName) {
-        List<String> command = getFFMpegGeneralFileCommand(executable, fileName);
-        command.add("-vcodec");
-        command.add("h264");
-        command.add("-pix_fmt");
-        command.add("yuv420p");
-        command.add("-ar");
-        command.add("48000");
-        command.add("-movflags");
-        command.add("+faststart");
-        return command;
-    }
-
-    /**
-     * Creates a list containing command line arguments for a general file
-     *
-     * @param executable <p>The executable to use (ffmpeg/ffprobe).</p>
-     * @param fileName   <p>The name of the file to execute on.</p>
-     * @return <p>A base list of ffmpeg commands for converting a file.</p>
-     */
-    public static List<String> getFFMpegGeneralFileCommand(String executable, String fileName) {
-        List<String> command = new ArrayList<>();
-        command.add(executable);
-        command.add("-nostdin");
-        command.add("-i");
-        command.add(fileName);
-        return command;
-    }
-
-    /**
-     * Adds debugging parameters for only converting parts of a file
-     *
-     * @param command <p>The list containing the command to run.</p>
-     * @param start   <p>The offset before converting.</p>
-     * @param length  <p>The offset for stopping the conversion.</p>
-     */
-    public static void addDebugArguments(List<String> command, int start, int length) {
-        command.add("-ss");
-        command.add("" + start);
-        command.add("-t");
-        command.add("" + length);
-    }
-
     /**
      * Parses a list of video stream parameters to a video stream object
      *

src/main/java/net/knarcraft/ffmpegconverter/utility/FileUtil.java

@@ -14,6 +14,19 @@ public final class FileUtil {
     private FileUtil() {
     }
 
+    /**
+     * Gets the path described by the input, but changed to account for collisions
+     *
+     * @param folder <p>The folder containing the output file.</p>
+     * @param file <p>The input file.</p>
+     * @param outExtension <p>The extension of the output file.</p>
+     * @return <p>A file name with the new extension and without any collisions.</p>
+     */
+    public static String getNonCollidingPath(File folder, File file, String outExtension) {
+        return FileUtil.getNonCollidingFilename(folder.getAbsolutePath() + File.separator +
+                FileUtil.stripExtension(file) + "." + outExtension, outExtension);
+    }
+
     /**
      * Adds parentheses with an integer if the output file already exists
      *
@@ -59,26 +72,36 @@ public final class FileUtil {
      * @return A list of files
      */
     public static File[] listFilesRecursive(File folder, String[] extensions, int maxRecursions) {
+        //Return if the target depth has been reached
         if (maxRecursions == 0) {
             return null;
         }
-        File[] listOfFiles = folder.listFiles((file) -> file.isFile() &&
+        //Get a list of all files which are folders and has one of the extensions specified
+        File[] foundFiles = folder.listFiles((file) -> file.isFile() &&
                 ListUtil.listContains(extensions, (item) -> file.getName().endsWith(item)));
-        if (listOfFiles == null) {
-            return null;
+        //Return if recursion is finished
+        if (maxRecursions == 1) {
+            return foundFiles;
         }
-        if (maxRecursions > 1) {
-            File[] listOfFolders = folder.listFiles((dir, name) -> new File(dir, name).isDirectory());
-            if (listOfFolders != null) {
-                for (File file : listOfFolders) {
-                    File[] nextLevel = listFilesRecursive(file, extensions, maxRecursions - 1);
-                    if (nextLevel != null) {
-                        listOfFiles = ListUtil.concatenate(listOfFiles, nextLevel);
-                    }
+        //Get all folders in the directory
+        File[] subFolders = folder.listFiles((dir, name) -> new File(dir, name).isDirectory());
+        //Return if the folder has no sub folders
+        if (subFolders == null) {
+            return foundFiles;
+        }
+        for (File subFolder : subFolders) {
+            //Get all relevant files contained within the sub folder
+            File[] nextLevel = listFilesRecursive(subFolder, extensions, maxRecursions - 1);
+            //Add found files to the output
+            if (nextLevel != null) {
+                if (foundFiles == null) {
+                    foundFiles = nextLevel;
+                } else {
+                    foundFiles = ListUtil.concatenate(foundFiles, nextLevel);
                 }
             }
         }
-        return listOfFiles;
+        return foundFiles;
     }
 
     /**

src/test/java/net/knarcraft/ffmpegconverter/utility/ListUtilTest.java

@@ -7,10 +7,13 @@ import java.util.ArrayList;
 import java.util.List;
 
 import static junit.framework.TestCase.assertEquals;
+import static junit.framework.TestCase.assertTrue;
 import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertFalse;
 
 public class ListUtilTest {
     private static List<Integer> matchesList;
+    private static Integer[] containsList;
 
     @BeforeClass
     public static void setUp() {
@@ -25,6 +28,7 @@ public class ListUtilTest {
         matchesList.add(19);
         matchesList.add(21);
         matchesList.add(23);
+        containsList = new Integer[]{1, 3, 5, 7, 234, 23, 45};
     }
 
     @Test
@@ -58,4 +62,28 @@ public class ListUtilTest {
         assertEquals(expected, result);
     }
 
+    @Test
+    public void listContainsFalse() {
+        assertFalse(ListUtil.listContains(containsList, (item) -> item == 0));
+    }
+
+    @Test
+    public void listContainsTrue() {
+        assertTrue(ListUtil.listContains(containsList, (item) -> item == 234));
+    }
+
+    @Test
+    public void getList() {
+        List<String> inputList = new ArrayList<>();
+        inputList.add("some test string");
+        inputList.add("some,test,string");
+        inputList.add("some te,st string");
+        String[] result1 = ListUtil.getList(inputList, 0);
+        String[] result2 = ListUtil.getList(inputList, 1);
+        String[] result3 = ListUtil.getList(inputList, 2);
+        assertArrayEquals(new String[]{"some test string"}, result1);
+        assertArrayEquals(new String[]{"some", "test", "string"}, result2);
+        assertArrayEquals(new String[]{"some te", "st string"}, result3);
+    }
+
 }