Improve input validation

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/Main.java

@@ -1,23 +1,18 @@
 package at.pcgamingfreaks.mkvaudiosubtitlechanger;
 
-import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.Config;
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.InputConfig;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.CachedMkvFileProcessor;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.kernel.AttributeUpdaterKernel;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.kernel.CoherentAttributeUpdaterKernel;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.kernel.DefaultAttributeUpdaterKernel;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.MkvFileCollector;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.util.ProjectUtil;
-import jakarta.validation.ConstraintViolation;
-import jakarta.validation.Validation;
-import jakarta.validation.Validator;
 import lombok.Getter;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.logging.log4j.Level;
 import org.apache.logging.log4j.core.config.Configurator;
 import picocli.CommandLine;
 
-import java.util.Set;
-
 @Slf4j
 @CommandLine.Command(
         name = "mkvaudiosubtitlechanger",
@@ -34,36 +29,7 @@ public class Main implements Runnable {
 
     @Getter
     @CommandLine.ArgGroup(exclusive = false)
-    private Config config;
-
-    @CommandLine.Spec
-    CommandLine.Model.CommandSpec spec;
-
-    @Override
-    public void run() {
-        if (config.isDebug()) {
-            Configurator.setRootLevel(Level.DEBUG);
-        }
-        validate();
-        Config.setInstance(config);
-        AttributeUpdaterKernel kernel = Config.getInstance().getCoherent() != null
-                ? new CoherentAttributeUpdaterKernel(new MkvFileCollector(), new CachedMkvFileProcessor())
-                : new DefaultAttributeUpdaterKernel(new MkvFileCollector(), new CachedMkvFileProcessor());
-        kernel.execute();
-    }
-
-    private void validate() {
-        Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
-        Set<ConstraintViolation<Config>> violations = validator.validate(config);
-
-        if (!violations.isEmpty()) {
-            StringBuilder errorMsg = new StringBuilder();
-            for (ConstraintViolation<Config> violation : violations) {
-                errorMsg.append("ERROR: ").append(violation.getPropertyPath()).append(" ").append(violation.getMessage()).append("\n");
-            }
-            throw new CommandLine.ParameterException(spec.commandLine(), errorMsg.toString());
-        }
-    }
+    private InputConfig config;
 
     public static void main(String[] args) {
         if (args.length == 0) {
@@ -71,4 +37,17 @@ public class Main implements Runnable {
         }
         new CommandLine(Main.class).execute(args);
     }
+
+    @Override
+    public void run() {
+        if (config.isDebug()) {
+            Configurator.setRootLevel(Level.DEBUG);
+        }
+
+        InputConfig.setInstance(config);
+        AttributeUpdaterKernel kernel = InputConfig.getInstance().getCoherent() != null
+                ? new CoherentAttributeUpdaterKernel(new MkvFileCollector(), new CachedMkvFileProcessor())
+                : new DefaultAttributeUpdaterKernel(new MkvFileCollector(), new CachedMkvFileProcessor());
+        kernel.execute();
+    }
 }

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/InputConfig.java

@@ -1,7 +1,12 @@
 package at.pcgamingfreaks.mkvaudiosubtitlechanger.config;
 
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.validation.ValidFile;
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.validation.ValidMkvToolNix;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.model.AttributeConfig;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.model.MkvToolNix;
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.util.ValidationUtil;
+import jakarta.validation.ConstraintViolation;
+import jakarta.validation.Validator;
 import jakarta.validation.constraints.Min;
 import lombok.AccessLevel;
 import lombok.Getter;
@@ -12,109 +17,115 @@ import org.apache.commons.lang3.SystemUtils;
 import picocli.CommandLine;
 
 import java.io.File;
-import java.nio.file.Path;
 import java.util.*;
 import java.util.regex.Pattern;
+import picocli.CommandLine.Option;
 
 @Slf4j
 @Getter
 @Setter
 @NoArgsConstructor
-public class Config implements CommandLine.IVersionProvider {
+@CommandLine.Command
+public class InputConfig {
     @Getter(AccessLevel.NONE)
     @Setter(AccessLevel.NONE)
-    private static Config config = null;
+    private static InputConfig config = null;
 
     private File configPath;
 
     @CommandLine.Spec
     CommandLine.Model.CommandSpec spec;
 
-    @CommandLine.Option(names = {"-a", "--attribute-config"}, required = true, arity = "1..*", converter = AttributeConfigConverter.class,
+    @Option(names = {"-a", "--attribute-config"}, required = true, arity = "1..*", converter = AttributeConfigConverter.class,
             description = "List of audio:subtitle pairs used to match in order and update files accordingly (e.g. jpn:eng jpn:ger)")
     private List<AttributeConfig> attributeConfig;
 
-    @Setter(AccessLevel.NONE)
+    @ValidFile(message = "does not exist")
+    @Option(names = {"-l", "--library"}, required = true, description = "path to library")
     private File libraryPath;
 
-    @CommandLine.Option(names = {"-s", "--safemode"}, description = "test run (no files will be changes)")
+    @Option(names = {"-s", "--safemode"}, description = "test run (no files will be changes)")
     private boolean safeMode;
 
-    @Setter(AccessLevel.NONE)
+    @ValidMkvToolNix(message = "does not exist")
+    @Option(names = {"-m", "--mkvtoolnix"}, defaultValue = "${DEFAULT_MKV_TOOL_NIX}", description = "path to mkvtoolnix installation")
     private File mkvToolNix;
 
-    @Min(value = 1)
-    @CommandLine.Option(names = {"-t", "--threads"}, defaultValue = "2", description = "thread count (default: ${DEFAULT-VALUE})")
+    @Min(1)
+    @Option(names = {"-t", "--threads"}, defaultValue = "2", description = "thread count (default: ${DEFAULT-VALUE})")
     private int threads;
 
-    @CommandLine.Option(names = {"-c", "--coherent"}, description = "try to match all files in dir of depth with the same attribute config")
+    @Min(0)
+    @Option(names = {"-c", "--coherent"}, description = "try to match all files in dir of depth with the same attribute config")
     private Integer coherent;
-    @CommandLine.Option(names = {"-cf", "--force-coherent"}, description = "changes are only applied if it's a coherent match")
+
+    @Option(names = {"-cf", "--force-coherent"}, description = "changes are only applied if it's a coherent match")
     private boolean forceCoherent;
 
-    @CommandLine.Option(names = {"-n", "--only-new-file"}, description = "sets filter-date to last successful execution (overwrites input of filter-date)")
+    @Option(names = {"-n", "--only-new-file"}, description = "sets filter-date to last successful execution (overwrites input of filter-date)")
     private boolean onlyNewFiles;
-    @CommandLine.Option(names = {"-d", "--filter-date"}, defaultValue = CommandLine.Option.NULL_VALUE, description = "only consider files created newer than entered date (format: \"dd.MM.yyyy-HH:mm:ss\")")
+
+    @Option(names = {"-d", "--filter-date"}, defaultValue = Option.NULL_VALUE, description = "only consider files created newer than entered date (format: \"dd.MM.yyyy-HH:mm:ss\")")
     private Date filterDate;
-    @CommandLine.Option(names = {"-i", "--include-pattern"}, defaultValue = ".*", description = "include files matching pattern (default: \".*\")")
+
+    @Option(names = {"-i", "--include-pattern"}, defaultValue = ".*", description = "include files matching pattern (default: \".*\")")
     private Pattern includePattern;
-    @CommandLine.Option(names = {"-e", "--excluded-directory"}, arity = "1..*",
+
+    @Option(names = {"-e", "--excluded-directory"}, arity = "1..*",
             description = "Directories to be excluded, combines with config file")
     private Set<String> excludedDirectories = new HashSet<>();
 
-    @CommandLine.Option(names = {"--forced-keywords"}, arity = "1..*", defaultValue = "forced, signs, songs", split = ", ",
+    @Option(names = {"--forced-keywords"}, arity = "1..*", defaultValue = "forced, signs, songs", split = ", ",
             description = "Keywords to identify forced tracks (Defaults will be overwritten; Default: ${DEFAULT-VALUE})")
     private Set<String> forcedKeywords;
-    @CommandLine.Option(names = {"--commentary-keywords"}, arity = "1..*", defaultValue = "commentary, director", split = ", ",
+
+    @Option(names = {"--commentary-keywords"}, arity = "1..*", defaultValue = "commentary, director", split = ", ",
             description = "Keywords to identify commentary tracks (Defaults will be overwritten; Default: ${DEFAULT-VALUE})")
     private Set<String> commentaryKeywords;
-    @CommandLine.Option(names = {"--preferred-subtitles"}, arity = "1..*", defaultValue = "unstyled", split = ", ",
+
+    @Option(names = {"--preferred-subtitles"}, arity = "1..*", defaultValue = "unstyled", split = ", ",
             description = "Keywords to prefer specific subtitle tracks (Defaults will be overwritten; Default: ${DEFAULT-VALUE})")
     private Set<String> preferredSubtitles;
 
-    @CommandLine.Option(names = {"--debug"}, description = "Enable debug logging")
+    @Option(names = {"--debug"}, description = "Enable debug logging")
     private boolean debug;
 
-    @CommandLine.Option(names = {"-l", "--library"}, required = true, description = "path to library")
-    public void setLibraryPath(File libraryPath) {
-        if (!libraryPath.exists()) throw new CommandLine.ParameterException(spec.commandLine(), "Path does not exist: " + libraryPath.getAbsolutePath());
-        this.libraryPath = libraryPath;
-    }
-
     static {
         // Set default value into system properties to picocli can read the conditional value
         System.setProperty("DEFAULT_MKV_TOOL_NIX", SystemUtils.IS_OS_WINDOWS ? "C:\\Program Files\\MKVToolNix" : "/usr/bin/");
     }
 
-    @CommandLine.Option(names = {"-m", "--mkvtoolnix"}, defaultValue = "${DEFAULT_MKV_TOOL_NIX}", description = "path to mkvtoolnix installation")
-    public void setMkvToolNix(File mkvToolNix) {
-        this.mkvToolNix = mkvToolNix;
-        if (!mkvToolNix.exists()
-                || !Path.of(getPathFor(MkvToolNix.MKV_MERGE, SystemUtils.IS_OS_WINDOWS)).toFile().exists()
-                || !Path.of(getPathFor(MkvToolNix.MKV_PROP_EDIT, SystemUtils.IS_OS_WINDOWS)).toFile().exists()) {
-            throw new CommandLine.ParameterException(spec.commandLine(),
-                    "Invalid path to mkvtoolnix installation: " + mkvToolNix.getAbsolutePath());
-        }
-    }
-
-    public static Config getInstance() {
+    public static InputConfig getInstance() {
         return getInstance(false);
     }
 
-    public static Config getInstance(boolean reset) {
+    public static InputConfig getInstance(boolean reset) {
         if (config == null || reset) {
-            config = new Config();
+            config = new InputConfig();
         }
         return config;
     }
 
-    public static void setInstance(Config c) {
+    public static void setInstance(InputConfig c) {
         config = c;
+        validate();
+    }
+
+    private static void validate() {
+        Validator validator = ValidationUtil.getValidator();
+        Set<ConstraintViolation<InputConfig>> violations = validator.validate(config);
+
+        if (!violations.isEmpty()) {
+            StringBuilder errors = new StringBuilder();
+            for (ConstraintViolation<InputConfig> violation : violations) {
+                errors.append(violation.getPropertyPath()).append(" ").append(violation.getMessage()).append("\n");
+            }
+            throw new CommandLine.ParameterException(config.getSpec().commandLine(), errors.toString());
+        }
     }
 
     /**
      * Get path to specific mkvtoolnix application.
-     *
      * @return absolute path to desired application.
      */
     public String getPathFor(MkvToolNix application) {
@@ -133,7 +144,7 @@ public class Config implements CommandLine.IVersionProvider {
 
     @Override
     public String toString() {
-        return new StringJoiner(", ", Config.class.getSimpleName() + "[", "]")
+        return new StringJoiner(", ", InputConfig.class.getSimpleName() + "[", "]")
                 .add("configPath=" + configPath)
                 .add("libraryPath=" + libraryPath)
                 .add("mkvToolNix=" + mkvToolNix)
@@ -151,10 +162,5 @@ public class Config implements CommandLine.IVersionProvider {
                 .add("attributeConfig=" + attributeConfig)
                 .toString();
     }
-
-    @Override
-    public String[] getVersion() throws Exception {
-        return new String[0];
-    }
 }
 

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/validation/ValidFile.java

@@ -0,0 +1,16 @@
+package at.pcgamingfreaks.mkvaudiosubtitlechanger.config.validation;
+
+import jakarta.validation.Constraint;
+import jakarta.validation.Payload;
+
+import java.lang.annotation.*;
+
+@Documented
+@Constraint(validatedBy = ValidFileValidator.class)
+@Target({ElementType.METHOD, ElementType.FIELD})
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ValidFile {
+    String message() default "File does not exist";
+    Class<?>[] groups() default {};
+    Class<? extends Payload>[] payload() default {};
+}

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/validation/ValidFileValidator.java

@@ -0,0 +1,17 @@
+package at.pcgamingfreaks.mkvaudiosubtitlechanger.config.validation;
+
+import jakarta.validation.ConstraintValidator;
+import jakarta.validation.ConstraintValidatorContext;
+
+import java.io.File;
+
+public class ValidFileValidator implements ConstraintValidator<ValidFile, File> {
+    @Override
+    public void initialize(ValidFile constraintAnnotation) {
+    }
+
+    @Override
+    public boolean isValid(File file, ConstraintValidatorContext context) {
+        return file != null && file.exists();
+    }
+}

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/validation/ValidMkvToolNix.java

@@ -0,0 +1,16 @@
+package at.pcgamingfreaks.mkvaudiosubtitlechanger.config.validation;
+
+import jakarta.validation.Constraint;
+import jakarta.validation.Payload;
+
+import java.lang.annotation.*;
+
+@Documented
+@Constraint(validatedBy = ValidMkvToolNixValidator.class)
+@Target({ElementType.METHOD, ElementType.FIELD})
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ValidMkvToolNix {
+    String message() default "MkvToolNix does not exist";
+    Class<?>[] groups() default {};
+    Class<? extends Payload>[] payload() default {};
+}

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/validation/ValidMkvToolNixValidator.java

@@ -0,0 +1,24 @@
+package at.pcgamingfreaks.mkvaudiosubtitlechanger.config.validation;
+
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.InputConfig;
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.model.MkvToolNix;
+import jakarta.validation.ConstraintValidator;
+import jakarta.validation.ConstraintValidatorContext;
+import org.apache.commons.lang3.SystemUtils;
+
+
+import java.io.File;
+import java.nio.file.Path;
+
+public class ValidMkvToolNixValidator implements ConstraintValidator<ValidMkvToolNix, File> {
+    @Override
+    public void initialize(ValidMkvToolNix constraintAnnotation) {
+    }
+
+    @Override
+    public boolean isValid(File file, ConstraintValidatorContext context) {
+        return file != null && file.exists()
+                && Path.of(InputConfig.getInstance().getPathFor(MkvToolNix.MKV_MERGE, SystemUtils.IS_OS_WINDOWS)).toFile().exists()
+                && Path.of(InputConfig.getInstance().getPathFor(MkvToolNix.MKV_PROP_EDIT, SystemUtils.IS_OS_WINDOWS)).toFile().exists();
+    }
+}

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/FileFilter.java

@@ -1,6 +1,6 @@
 package at.pcgamingfreaks.mkvaudiosubtitlechanger.impl;
 
-import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.Config;
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.InputConfig;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.model.ResultStatistic;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.util.DateUtils;
 import lombok.extern.slf4j.Slf4j;
@@ -31,11 +31,11 @@ public class FileFilter {
     }
 
     private static boolean hasMatchingPattern(File pathName) {
-        return Config.getInstance().getIncludePattern().matcher(pathName.getName()).matches();
+        return InputConfig.getInstance().getIncludePattern().matcher(pathName.getName()).matches();
     }
 
     private static boolean isNewer(File pathName) {
-        Config config = Config.getInstance();
+        InputConfig config = InputConfig.getInstance();
         if (config.getFilterDate() == null) return true;
         try {
             BasicFileAttributes attributes = Files.readAttributes(pathName.toPath(), BasicFileAttributes.class);
@@ -47,6 +47,6 @@ public class FileFilter {
     }
 
     private static boolean isNewer(Date creationDate) {
-        return creationDate.toInstant().isAfter(Config.getInstance().getFilterDate().toInstant());
+        return creationDate.toInstant().isAfter(InputConfig.getInstance().getFilterDate().toInstant());
     }
 }

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/MkvFileProcessor.java

@@ -1,6 +1,6 @@
 package at.pcgamingfreaks.mkvaudiosubtitlechanger.impl;
 
-import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.Config;
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.InputConfig;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.exceptions.MkvToolNixException;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.model.*;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.util.SetUtils;
@@ -26,7 +26,7 @@ public class MkvFileProcessor implements FileProcessor {
     private final ObjectMapper mapper = new ObjectMapper();
 
     private static final SubtitleTrackComparator subtitleTrackComparator =
-            new SubtitleTrackComparator(Config.getInstance().getPreferredSubtitles().toArray(new String[0]));
+            new SubtitleTrackComparator(InputConfig.getInstance().getPreferredSubtitles().toArray(new String[0]));
 
     private static final String DISABLE_DEFAULT_TRACK = "--edit track:%s --set flag-default=0";
     private static final String ENABLE_DEFAULT_TRACK = "--edit track:%s --set flag-default=1";
@@ -40,7 +40,7 @@ public class MkvFileProcessor implements FileProcessor {
         List<FileAttribute> fileAttributes = new ArrayList<>();
         try {
             String[] command = new String[]{
-                    Config.getInstance().getPathFor(MkvToolNix.MKV_MERGE),
+                    InputConfig.getInstance().getPathFor(MkvToolNix.MKV_MERGE),
                     "--identify",
                     "--identification-format",
                     "json",
@@ -132,7 +132,7 @@ public class MkvFileProcessor implements FileProcessor {
     public List<FileAttribute> retrieveNonForcedTracks(List<FileAttribute> attributes) {
         return attributes.stream()
                 .filter(elem -> !StringUtils.containsAnyIgnoreCase(elem.trackName(),
-                        Config.getInstance().getForcedKeywords().toArray(new CharSequence[0])))
+                        InputConfig.getInstance().getForcedKeywords().toArray(new CharSequence[0])))
                 .filter(elem -> !elem.forcedTrack())
                 .collect(Collectors.toList());
     }
@@ -141,7 +141,7 @@ public class MkvFileProcessor implements FileProcessor {
     public List<FileAttribute> retrieveNonCommentaryTracks(List<FileAttribute> attributes) {
         return attributes.stream()
                 .filter(elem -> !StringUtils.containsAnyIgnoreCase(elem.trackName(),
-                        Config.getInstance().getCommentaryKeywords().toArray(new CharSequence[0])))
+                        InputConfig.getInstance().getCommentaryKeywords().toArray(new CharSequence[0])))
                 .collect(Collectors.toList());
     }
 
@@ -151,7 +151,7 @@ public class MkvFileProcessor implements FileProcessor {
     @Override
     public void update(File file, FileInfo fileInfo) throws IOException, MkvToolNixException {
         List<String> command = new ArrayList<>();
-        command.add(Config.getInstance().getPathFor(MkvToolNix.MKV_PROP_EDIT));
+        command.add(InputConfig.getInstance().getPathFor(MkvToolNix.MKV_PROP_EDIT));
         command.add(String.format(file.getAbsolutePath()));
 
         if (fileInfo.isAudioDifferent()) {

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/kernel/AttributeUpdaterKernel.java

@@ -1,6 +1,6 @@
 package at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.kernel;
 
-import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.Config;
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.InputConfig;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.exceptions.MkvToolNixException;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.FileCollector;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.FileProcessor;
@@ -38,7 +38,7 @@ public abstract class AttributeUpdaterKernel {
     protected final FileCollector collector;
     protected final FileProcessor processor;
     protected final ResultStatistic statistic = ResultStatistic.getInstance();
-    private final ExecutorService executor = Executors.newFixedThreadPool(Config.getInstance().getThreads());
+    private final ExecutorService executor = Executors.newFixedThreadPool(InputConfig.getInstance().getThreads());
 
     protected ProgressBarBuilder pbBuilder() {
         return new ProgressBarBuilder()
@@ -52,7 +52,7 @@ public abstract class AttributeUpdaterKernel {
         statistic.startTimer();
 
         try (ProgressBar progressBar = pbBuilder().build()) {
-            List<File> files = loadFiles(Config.getInstance().getLibraryPath().getAbsolutePath());
+            List<File> files = loadFiles(InputConfig.getInstance().getLibraryPath().getAbsolutePath());
             progressBar.maxHint(files.size());
 
             files.forEach(file -> executor.submit(() -> {
@@ -71,7 +71,7 @@ public abstract class AttributeUpdaterKernel {
     }
 
     protected List<File> loadExcludedFiles() {
-        List<File> excludedFiles = Config.getInstance().getExcludedDirectories().stream()
+        List<File> excludedFiles = InputConfig.getInstance().getExcludedDirectories().stream()
                 .map(collector::loadFiles)
                 .flatMap(Collection::stream)
                 .collect(Collectors.toList());
@@ -111,7 +111,7 @@ public abstract class AttributeUpdaterKernel {
 
         processor.detectDefaultTracks(fileInfo, attributes, nonForcedTracks);
         processor.detectDesiredTracks(fileInfo, nonForcedTracks, nonCommentaryTracks,
-                Config.getInstance().getAttributeConfig().toArray(new AttributeConfig[]{}));
+                InputConfig.getInstance().getAttributeConfig().toArray(new AttributeConfig[]{}));
 
         updateFile(fileInfo);
     }
@@ -142,7 +142,7 @@ public abstract class AttributeUpdaterKernel {
     }
 
     private void commitChange(FileInfo fileInfo) {
-        if (Config.getInstance().isSafeMode()) {
+        if (InputConfig.getInstance().isSafeMode()) {
             return;
         }
 
@@ -157,7 +157,7 @@ public abstract class AttributeUpdaterKernel {
     }
 
     protected void endProcess() {
-        if (Config.getInstance().isSafeMode()) {
+        if (InputConfig.getInstance().isSafeMode()) {
             return;
         }
 
@@ -171,7 +171,7 @@ public abstract class AttributeUpdaterKernel {
             if (!lastExecutionFile.exists()) lastExecutionFile.createNewFile();
 
             YAML yaml = new YAML(lastExecutionFile);
-            yaml.set(Config.getInstance().getNormalizedLibraryPath(), DateUtils.convert(new Date()));
+            yaml.set(InputConfig.getInstance().getNormalizedLibraryPath(), DateUtils.convert(new Date()));
             yaml.save(lastExecutionFile);
         } catch (IOException | YamlInvalidContentException e) {
             log.error("last-execution.yml could not be created or read.", e);

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/kernel/CoherentAttributeUpdaterKernel.java

@@ -1,6 +1,6 @@
 package at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.kernel;
 
-import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.Config;
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.InputConfig;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.FileCollector;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.FileProcessor;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.model.AttributeConfig;
@@ -32,7 +32,7 @@ public class CoherentAttributeUpdaterKernel extends AttributeUpdaterKernel {
      */
     @Override
     List<File> loadFiles(String path) {
-        return loadFiles(path, Config.getInstance().getCoherent());
+        return loadFiles(path, InputConfig.getInstance().getCoherent());
     }
 
     List<File> loadFiles(String path, int depth) {
@@ -53,7 +53,7 @@ public class CoherentAttributeUpdaterKernel extends AttributeUpdaterKernel {
 
     /**
      * Update files in directory, if possible, with the same {@link AttributeConfig}.
-     * If {@link Config#isForceCoherent()} then there will be no changes to the file if they don't match the same config.
+     * If {@link InputConfig#isForceCoherent()} then there will be no changes to the file if they don't match the same config.
      * Otherwise, the default behaviour is executed.
      * This method is called by the executor and is run in parallel.
      *
@@ -61,7 +61,7 @@ public class CoherentAttributeUpdaterKernel extends AttributeUpdaterKernel {
      */
     @Override
     void process(File file) {
-        process(file, Config.getInstance().getCoherent());
+        process(file, InputConfig.getInstance().getCoherent());
     }
 
     void process(File file, int depth) {
@@ -71,7 +71,7 @@ public class CoherentAttributeUpdaterKernel extends AttributeUpdaterKernel {
                 .map(FileInfo::new)
                 .collect(Collectors.toList());
 
-        for (AttributeConfig config : Config.getInstance().getAttributeConfig()) {
+        for (AttributeConfig config : InputConfig.getInstance().getAttributeConfig()) {
 
             for (FileInfo fileInfo : fileInfos) {
                 List<FileAttribute> attributes = processor.loadAttributes(fileInfo.getFile());
@@ -99,7 +99,7 @@ public class CoherentAttributeUpdaterKernel extends AttributeUpdaterKernel {
         log.info("No coherent match found for {}", file.getAbsoluteFile());
 
         for (FileInfo fileInfo : fileInfos) {
-            if (!Config.getInstance().isForceCoherent()) {
+            if (!InputConfig.getInstance().isForceCoherent()) {
                 super.process(fileInfo.getFile());
             } else {
                 statistic.excluded();

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/kernel/DefaultAttributeUpdaterKernel.java

@@ -1,6 +1,6 @@
 package at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.kernel;
 
-import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.Config;
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.InputConfig;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.FileCollector;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.impl.FileProcessor;
 import lombok.extern.slf4j.Slf4j;
@@ -29,7 +29,7 @@ public class DefaultAttributeUpdaterKernel extends AttributeUpdaterKernel {
     @Override
     List<File> loadFiles(String path) {
         List<File> excludedFiles = loadExcludedFiles();
-        return collector.loadFiles(Config.getInstance().getLibraryPath().getAbsolutePath()).stream()
+        return collector.loadFiles(InputConfig.getInstance().getLibraryPath().getAbsolutePath()).stream()
                 .filter(file -> !excludedFiles.contains(file))
                 .collect(Collectors.toList());
     }

src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/util/ValidationUtil.java

@@ -0,0 +1,12 @@
+package at.pcgamingfreaks.mkvaudiosubtitlechanger.util;
+
+import jakarta.validation.Validation;
+import jakarta.validation.Validator;
+import jakarta.validation.ValidatorFactory;
+import lombok.Getter;
+
+public class ValidationUtil {
+    private static final ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
+    @Getter
+    private static final Validator validator = factory.getValidator();
+}