Improves some method names and comments. Refactors parser

src/main/java/net/knarcraft/ffmpegconverter/Main.java

@@ -111,11 +111,11 @@ class Main {
         String[] subtitleLang = new String[]{"eng", "*"};
         boolean toStereo = true;
         boolean preventSigns = true;
-        if (input.size() > 0 && ListUtil.getList(input, 0) != null) {
-            audioLang = ListUtil.getList(input, 0);
+        if (input.size() > 0 && ListUtil.getListFromCommaSeparatedStringList(input, 0) != null) {
+            audioLang = ListUtil.getListFromCommaSeparatedStringList(input, 0);
         }
-        if (input.size() > 1 && ListUtil.getList(input, 1) != null) {
-            subtitleLang = ListUtil.getList(input, 1);
+        if (input.size() > 1 && ListUtil.getListFromCommaSeparatedStringList(input, 1) != null) {
+            subtitleLang = ListUtil.getListFromCommaSeparatedStringList(input, 1);
         }
         if (input.size() > 2) {
             toStereo = Boolean.parseBoolean(input.get(2));

src/main/java/net/knarcraft/ffmpegconverter/converter/AbstractConverter.java

@@ -130,7 +130,7 @@ public abstract class AbstractConverter implements Converter {
         OutputUtil.println();
         OutputUtil.println("Preparing to start process...");
         OutputUtil.println("Converting " + file);
-        ProcessBuilder processBuilder = new ProcessBuilder(builderCommand(ffmpegPath, file, streams, newPath));
+        ProcessBuilder processBuilder = new ProcessBuilder(generateConversionCommand(ffmpegPath, file, streams, newPath));
         FFMpegHelper.runProcess(processBuilder, folder, "\n", true);
     }
 

src/main/java/net/knarcraft/ffmpegconverter/converter/AnimeConverter.java

@@ -47,7 +47,7 @@ public class AnimeConverter extends AbstractConverter {
     }
 
     @Override
-    public String[] builderCommand(String executable, File file, List<StreamObject> streams, String outFile) {
+    public String[] generateConversionCommand(String executable, File file, List<StreamObject> streams, String outFile) {
         List<String> command = FFMpegHelper.getFFMpegWebVideoCommand(executable, file.getName());
         if (this.DEBUG) {
             FFMpegHelper.addDebugArguments(command, 50, 120);

src/main/java/net/knarcraft/ffmpegconverter/converter/AudioConverter.java

@@ -27,7 +27,7 @@ public class AudioConverter extends AbstractConverter {
     }
 
     @Override
-    public String[] builderCommand(String executable, File file, List<StreamObject> streams, String outFile) {
+    public String[] generateConversionCommand(String executable, File file, List<StreamObject> streams, String outFile) {
         List<String> command = FFMpegHelper.getFFMpegGeneralFileCommand(executable, file.getName());
         if (this.DEBUG) {
             FFMpegHelper.addDebugArguments(command, 50, 120);

src/main/java/net/knarcraft/ffmpegconverter/converter/Converter.java

@@ -28,5 +28,5 @@ public interface Converter {
      * @param outFile    <p>The output file.</p>
      * @return <p>A list of commands</p>
      */
-    String[] builderCommand(String executable, File file, List<StreamObject> streams, String outFile);
+    String[] generateConversionCommand(String executable, File file, List<StreamObject> streams, String outFile);
 }

src/main/java/net/knarcraft/ffmpegconverter/converter/VideoConverter.java

@@ -29,7 +29,7 @@ public class VideoConverter extends AbstractConverter {
     }
 
     @Override
-    public String[] builderCommand(String executable, File file, List<StreamObject> streams, String outFile) {
+    public String[] generateConversionCommand(String executable, File file, List<StreamObject> streams, String outFile) {
         List<String> command = FFMpegHelper.getFFMpegGeneralFileCommand(executable, file.getName());
         if (this.DEBUG) {
             FFMpegHelper.addDebugArguments(command, 50, 120);

src/main/java/net/knarcraft/ffmpegconverter/streams/AbstractStream.java

@@ -1,7 +1,7 @@
 package net.knarcraft.ffmpegconverter.streams;
 
 /**
- * An object representation of a stream in a media file
+ * An abstract implementation of a stream object implementing common methods
  */
 public abstract class AbstractStream implements StreamObject {
     int absoluteIndex;

src/main/java/net/knarcraft/ffmpegconverter/streams/AudioStream.java

@@ -17,7 +17,8 @@ public class AudioStream extends AbstractStream implements StreamObject {
      * @param title         <p>The title of the audio stream.</p>
      * @param channels      <p>The number of channels for the audio stream.</p>
      */
-    public AudioStream(String codecName, int absoluteIndex, int relativeIndex, String language, String title, int channels) {
+    public AudioStream(String codecName, int absoluteIndex, int relativeIndex, String language, String title,
+                       int channels) {
         this.codecName = codecName;
         this.absoluteIndex = absoluteIndex;
         this.language = language;

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

@@ -27,33 +27,6 @@ public final class FileUtil {
                 FileUtil.stripExtension(file) + "." + outExtension, outExtension);
     }
 
-    /**
-     * Adds parentheses with an integer if the output file already exists
-     *
-     * @param targetPath <p>The path the file should ideally be saved at.</p>
-     * @param extension  <p>The extension of the target file.</p>
-     * @return <p>A filename guaranteed not to collide with other files.</p>
-     */
-    public static String getNonCollidingFilename(String targetPath, String extension) {
-        File newFile = new File(targetPath);
-        String fileName = stripExtension(targetPath);
-        int i = 1;
-        while (newFile.exists()) {
-            newFile = new File(fileName + "(" + i++ + ")" + "." + extension);
-        }
-        return newFile.toString();
-    }
-
-    /**
-     * Gets filename without extension from File object
-     *
-     * @param file <p>A file object.</p>
-     * @return <p>A filename.</p>
-     */
-    public static String stripExtension(File file) {
-        return file.getName().substring(0, file.getName().lastIndexOf('.'));
-    }
-
     /**
      * Removes the extension from a file name
      *
@@ -134,4 +107,31 @@ public final class FileUtil {
         return classloader.getResourceAsStream(resourceName);
     }
 
+    /**
+     * Adds parentheses with an integer if the output file already exists
+     *
+     * @param targetPath <p>The path the file should ideally be saved at.</p>
+     * @param extension  <p>The extension of the target file.</p>
+     * @return <p>A filename guaranteed not to collide with other files.</p>
+     */
+    private static String getNonCollidingFilename(String targetPath, String extension) {
+        File newFile = new File(targetPath);
+        String fileName = stripExtension(targetPath);
+        int i = 1;
+        while (newFile.exists()) {
+            newFile = new File(fileName + "(" + i++ + ")" + "." + extension);
+        }
+        return newFile.toString();
+    }
+
+    /**
+     * Gets filename without extension from File object
+     *
+     * @param file <p>A file object.</p>
+     * @return <p>A filename.</p>
+     */
+    private static String stripExtension(File file) {
+        return file.getName().substring(0, file.getName().lastIndexOf('.'));
+    }
+
 }

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

@@ -40,11 +40,9 @@ public final class ListUtil {
      * @return <p>A new list containing all matching elements.</p>
      */
     static <T> List<T> getMatching(List<T> list, Predicate<T> predicate) {
-        list = new ArrayList<>(list);
-        List<T> copy = new ArrayList<>(list);
-        list.removeIf(predicate);
-        copy.removeAll(list);
-        return copy;
+        List<T> matching = new ArrayList<>(list);
+        matching.removeIf(predicate.negate());
+        return matching;
     }
 
     /**
@@ -71,7 +69,7 @@ public final class ListUtil {
      * @param index <p>The index of the token containing comma separated entries.</p>
      * @return <p>A string list.</p>
      */
-    public static String[] getList(List<String> list, int index) {
+    public static String[] getListFromCommaSeparatedStringList(List<String> list, int index) {
         String[] result = null;
         if (list.size() > index) {
             if (list.get(index).contains(",")) {

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

@@ -58,18 +58,12 @@ public final class Parser {
         List<String> tokens = new ArrayList<>();
         boolean startedQuote = false;
         StringBuilder currentToken = new StringBuilder();
-        for (int i = 0; i < input.length(); i++) {
-            char character = input.charAt(i);
+        for (int index = 0; index < input.length(); index++) {
+            char character = input.charAt(index);
             switch (character) {
                 case ' ':
-                    if (!startedQuote) {
-                        //If not inside "", a space marks the end of a parameter
-                        if (isNotEmpty(currentToken)) {
-                            tokens.add(currentToken.toString());
-                        }
+                    if (tokenizeSpace(startedQuote, currentToken, tokens)) {
                         currentToken = new StringBuilder();
-                    } else {
-                        currentToken.append(character);
                     }
                     break;
                 case '"':
@@ -87,17 +81,51 @@ public final class Parser {
                     }
                     break;
                 default:
-                    //Adds a normal character to the token. Adds the current token to tokens if at the end of the input.
-                    currentToken.append(character);
-                    if (i == input.length() - 1) {
-                        tokens.add(currentToken.toString());
-                    }
+                    tokenizeNormalCharacter(currentToken, character, input.length(), index, tokens);
                     break;
             }
         }
         return tokens;
     }
 
+    /**
+     * Adds a normal character to the token. Adds the current token to tokens if at the end of the input
+     *
+     * @param currentToken <p>The string builder containing the current token.</p>
+     * @param character    <p>The character found in the input.</p>
+     * @param inputLength  <p>The length of the given input</p>
+     * @param index        <p>The index of the read character.</p>
+     * @param tokens       <p>The list of processed tokens.</p>
+     */
+    private static void tokenizeNormalCharacter(StringBuilder currentToken, char character, int inputLength, int index,
+                                                List<String> tokens) {
+        currentToken.append(character);
+        if (index == inputLength - 1) {
+            tokens.add(currentToken.toString());
+        }
+    }
+
+    /**
+     * Tokenizes a space character
+     *
+     * @param startedQuote <p>Whether this space is inside a pair of quotes.</p>
+     * @param currentToken <p>The string builder containing the current token.</p>
+     * @param tokens       <p>The list of processed tokens.</p>
+     * @return <p>True if the token is finished.</p>
+     */
+    private static boolean tokenizeSpace(boolean startedQuote, StringBuilder currentToken, List<String> tokens) {
+        if (!startedQuote) {
+            //If not inside "", a space marks the end of a parameter
+            if (isNotEmpty(currentToken)) {
+                tokens.add(currentToken.toString());
+            }
+            return true;
+        } else {
+            currentToken.append(' ');
+            return false;
+        }
+    }
+
     /**
      * Checks whether a string builder is empty
      *

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

@@ -17,13 +17,16 @@ final class StringUtil {
      * @return <p>A list of all occurrences of the substring.</p>
      */
     static String[] stringBetween(String string, String start, String end) {
-        int startPos = string.indexOf(start) + start.length();
-        if (!string.contains(start) || string.indexOf(end, startPos) < startPos) {
+        int startPosition = string.indexOf(start) + start.length();
+        //Return if the string is not found
+        if (!string.contains(start) || string.indexOf(end, startPosition) < startPosition) {
             return new String[]{};
         }
-        int endPos = string.indexOf(end, startPos);
-        String outString = string.substring(startPos, endPos).trim();
-        String nextString = string.substring(endPos + end.length());
+        int endPosition = string.indexOf(end, startPosition);
+        //Get the string between the start and end string
+        String outString = string.substring(startPosition, endPosition).trim();
+        String nextString = string.substring(endPosition + end.length());
+        //Add other occurrences recursively
         return ListUtil.concatenate(new String[]{outString}, stringBetween(nextString, start, end));
     }
 }

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

@@ -78,9 +78,9 @@ public class ListUtilTest {
         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);
+        String[] result1 = ListUtil.getListFromCommaSeparatedStringList(inputList, 0);
+        String[] result2 = ListUtil.getListFromCommaSeparatedStringList(inputList, 1);
+        String[] result3 = ListUtil.getListFromCommaSeparatedStringList(inputList, 2);
         assertArrayEquals(new String[]{"some test string"}, result1);
         assertArrayEquals(new String[]{"some", "test", "string"}, result2);
         assertArrayEquals(new String[]{"some te", "st string"}, result3);