src/main/java/rife/bld/operations/JavacOptions.java

@@ -1,17 +1,18 @@
 /*
- * Copyright 2001-2026 Geert Bevin (gbevin[remove] at uwyn dot com)
+ * Copyright 2001-2023 Geert Bevin (gbevin[remove] at uwyn dot com)
  * Licensed under the Apache License, Version 2.0 (the "License")
  */
 package rife.bld.operations;
 
 import rife.tools.Convert;
+import rife.tools.FileUtils;
+import rife.tools.StringUtils;
 
 import java.io.File;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.Collection;
-import java.util.Objects;
+import java.util.List;
 import java.util.stream.Collectors;
 
 import static rife.bld.operations.CompileOperation.COMPILE_OPTION_MODULE_PATH;
@@ -22,7 +23,6 @@ import static rife.bld.operations.CompileOperation.COMPILE_OPTION_MODULE_PATH;
  * @author Geert Bevin (gbevin[remove] at uwyn dot com)
  * @since 1.5.18
  */
-@SuppressWarnings("UnusedReturnValue")
 public class JavacOptions extends ArrayList<String> {
     public enum DebuggingInfo {
         ALL, NONE, LINES, VAR, SOURCE
@@ -79,46 +79,6 @@ public class JavacOptions extends ArrayList<String> {
         VARARGS
     }
 
-    // Helper method to check if an array is not empty
-    private static <T> boolean isNotEmpty(T[] array) {
-        return array != null && array.length > 0;
-    }
-
-    // Helper method to check if a collection is not empty
-    private static boolean isNotEmpty(Collection<?> collection) {
-        return collection != null && !collection.isEmpty();
-    }
-
-    /**
-     * Helper method to add delimited options
-     */
-    private JavacOptions addDelimitedOption(String option, Collection<String> values, String separator) {
-        if (isNotEmpty(values)) {
-            var joined = values.stream()
-                    .filter(Objects::nonNull)
-                    .collect(Collectors.joining(separator));
-            if (!joined.isEmpty()) {
-                add(option);
-                add(joined);
-            }
-        }
-        return this;
-    }
-
-    /**
-     * Helper method to add path-based options
-     */
-    private JavacOptions addPathOption(String option, Collection<String> paths) {
-        return addDelimitedOption(option, paths, File.pathSeparator);
-    }
-
-    /**
-     * Helper method to add comma-separated options
-     */
-    private JavacOptions addCommaSeparatedOption(String option, Collection<String> values) {
-        return addDelimitedOption(option, values, ",");
-    }
-
     /**
      * Option to pass to annotation processors
      *
@@ -139,10 +99,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 2.3.1
      */
     public JavacOptions addExports(String... modules) {
-        if (isNotEmpty(modules)) {
-            addExports(Arrays.asList(modules));
-        }
-        return this;
+        return addExports(Arrays.asList(modules));
     }
 
     /**
@@ -153,20 +110,9 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.3.1
      */
-    public JavacOptions addExports(Collection<String> modules) {
-        return addCommaSeparatedOption("--add-exports", modules);
-    }
-
-    /**
-     * Specifies additional modules to be considered as required by a given module
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions addReads(String... modules) {
-        if (isNotEmpty(modules)) {
-            addReads(Arrays.asList(modules));
-        }
+    public JavacOptions addExports(List<String> modules) {
+        add("--add-exports");
+        add(StringUtils.join(modules, ","));
         return this;
     }
 
@@ -176,8 +122,20 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.3.1
      */
-    public JavacOptions addReads(Collection<String> modules) {
-        return addCommaSeparatedOption("--add-reads", modules);
+    public JavacOptions addReads(String... modules) {
+        return addReads(Arrays.asList(modules));
+    }
+
+    /**
+     * Specifies additional modules to be considered as required by a given module
+     *
+     * @return this list of options
+     * @since 2.3.1
+     */
+    public JavacOptions addReads(List<String> modules) {
+        add("--add-reads");
+        add(StringUtils.join(modules, ","));
+        return this;
     }
 
     /**
@@ -188,10 +146,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 1.5.18
      */
     public JavacOptions addModules(String... modules) {
-        if (isNotEmpty(modules)) {
-            addModules(Arrays.asList(modules));
-        }
-        return this;
+        return addModules(Arrays.asList(modules));
     }
 
     /**
@@ -201,8 +156,10 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 1.5.18
      */
-    public JavacOptions addModules(Collection<String> modules) {
-        return addCommaSeparatedOption("--add-modules", modules);
+    public JavacOptions addModules(List<String> modules) {
+        add("--add-modules");
+        add(StringUtils.join(modules, ","));
+        return this;
     }
 
     /**
@@ -259,10 +216,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 1.5.18
      */
     public JavacOptions endorsedDirs(File... dirs) {
-        if (isNotEmpty(dirs)) {
-            endorsedDirs(Arrays.asList(dirs));
-        }
-        return this;
+        return endorsedDirs(Arrays.asList(dirs));
     }
 
     /**
@@ -271,12 +225,9 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 1.5.18
      */
-    public JavacOptions endorsedDirs(Collection<File> dirs) {
-        if (isNotEmpty(dirs)) {
+    public JavacOptions endorsedDirs(List<File> dirs) {
         return endorsedDirsStrings(dirs.stream().map(File::getAbsolutePath).toList());
     }
-        return this;
-    }
 
     /**
      * Override location of endorsed standards path
@@ -285,10 +236,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 2.1
      */
     public JavacOptions endorsedDirs(Path... dirs) {
-        if (isNotEmpty(dirs)) {
-            endorsedDirsPaths(Arrays.asList(dirs));
-        }
-        return this;
+        return endorsedDirsPaths(Arrays.asList(dirs));
     }
 
     /**
@@ -297,12 +245,9 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions endorsedDirsPaths(Collection<Path> dirs) {
-        if (isNotEmpty(dirs)) {
+    public JavacOptions endorsedDirsPaths(List<Path> dirs) {
         return endorsedDirs(dirs.stream().map(Path::toFile).toList());
     }
-        return this;
-    }
 
     /**
      * Override location of endorsed standards path
@@ -311,10 +256,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 2.1
      */
     public JavacOptions endorsedDirs(String... dirs) {
-        if (isNotEmpty(dirs)) {
-            endorsedDirsStrings(Arrays.asList(dirs));
-        }
-        return this;
+        return endorsedDirsStrings(Arrays.asList(dirs));
     }
 
     /**
@@ -323,8 +265,10 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions endorsedDirsStrings(Collection<String> dirs) {
-        return addCommaSeparatedOption("-endorseddirs", dirs);
+    public JavacOptions endorsedDirsStrings(List<String> dirs) {
+        add("-endorseddirs");
+        add(String.join(",", dirs));
+        return this;
     }
 
     /**
@@ -334,10 +278,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 1.5.18
      */
     public JavacOptions extDirs(File... dirs) {
-        if (isNotEmpty(dirs)) {
-            extDirs(Arrays.asList(dirs));
-        }
-        return this;
+        return extDirs(Arrays.asList(dirs));
     }
 
     /**
@@ -346,12 +287,9 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 1.5.18
      */
-    public JavacOptions extDirs(Collection<File> dirs) {
-        if (isNotEmpty(dirs)) {
+    public JavacOptions extDirs(List<File> dirs) {
         return extDirsStrings(dirs.stream().map(File::getAbsolutePath).toList());
     }
-        return this;
-    }
 
     /**
      * Override location of installed extensions
@@ -360,10 +298,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 2.1
      */
     public JavacOptions extDirs(Path... dirs) {
-        if (isNotEmpty(dirs)) {
-            extDirsPaths(Arrays.asList(dirs));
-        }
-        return this;
+        return extDirsPaths(Arrays.asList(dirs));
     }
 
     /**
@@ -372,12 +307,9 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions extDirsPaths(Collection<Path> dirs) {
-        if (isNotEmpty(dirs)) {
+    public JavacOptions extDirsPaths(List<Path> dirs) {
         return extDirs(dirs.stream().map(Path::toFile).toList());
     }
-        return this;
-    }
 
     /**
      * Override location of installed extensions
@@ -386,10 +318,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 2.1
      */
     public JavacOptions extDirs(String... dirs) {
-        if (isNotEmpty(dirs)) {
-            extDirsStrings(Arrays.asList(dirs));
-        }
-        return this;
+        return extDirsStrings(Arrays.asList(dirs));
     }
 
     /**
@@ -398,8 +327,10 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions extDirsStrings(Collection<String> dirs) {
-        return addCommaSeparatedOption("-extdirs", dirs);
+    public JavacOptions extDirsStrings(List<String> dirs) {
+        add("-extdirs");
+        add(String.join(",", dirs));
+        return this;
     }
 
     /**
@@ -526,10 +457,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 1.5.18
      */
     public JavacOptions limitModules(String... modules) {
-        if (isNotEmpty(modules)) {
-            limitModules(Arrays.asList(modules));
-        }
-        return this;
+        return limitModules(Arrays.asList(modules));
     }
 
     /**
@@ -538,8 +466,10 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 1.5.18
      */
-    public JavacOptions limitModules(Collection<String> modules) {
-        return addCommaSeparatedOption("--limit-modules", modules);
+    public JavacOptions limitModules(List<String> modules) {
+        add("--limit-modules");
+        add(StringUtils.join(modules, ","));
+        return this;
     }
 
     /**
@@ -549,10 +479,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 1.5.18
      */
     public JavacOptions module(String... modules) {
-        if (isNotEmpty(modules)) {
-            module(Arrays.asList(modules));
-        }
-        return this;
+        return module(Arrays.asList(modules));
     }
 
     /**
@@ -561,22 +488,20 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 1.5.18
      */
-    public JavacOptions module(Collection<String> modules) {
-        return addCommaSeparatedOption("--module", modules);
+    public JavacOptions module(List<String> modules) {
+        add("--module");
+        add(StringUtils.join(modules, ","));
+        return this;
     }
 
     /**
-     * /**
      * Specify where to find application modules
      *
      * @return this list of options
      * @since 1.5.18
      */
     public JavacOptions modulePath(File... paths) {
-        if (isNotEmpty(paths)) {
-            modulePath(Arrays.asList(paths));
-        }
-        return this;
+        return modulePath(Arrays.asList(paths));
     }
 
     /**
@@ -585,12 +510,9 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 1.6.2
      */
-    public JavacOptions modulePath(Collection<File> paths) {
-        if (isNotEmpty(paths)) {
+    public JavacOptions modulePath(List<File> paths) {
         return modulePathStrings(paths.stream().map(File::getAbsolutePath).toList());
     }
-        return this;
-    }
 
     /**
      * Specify where to find application modules
@@ -599,10 +521,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 2.1
      */
     public JavacOptions modulePath(Path... paths) {
-        if (isNotEmpty(paths)) {
-            modulePathPaths(Arrays.asList(paths));
-        }
-        return this;
+        return modulePathPaths(Arrays.asList(paths));
     }
 
     /**
@@ -611,11 +530,8 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions modulePathPaths(Collection<Path> paths) {
-        if (isNotEmpty(paths)) {
-            return modulePathStrings(paths.stream().map(Path::toString).toList());
-        }
-        return this;
+    public JavacOptions modulePathPaths(List<Path> paths) {
+        return modulePath(paths.stream().map(Path::toFile).toList());
     }
 
     /**
@@ -625,10 +541,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 2.1
      */
     public JavacOptions modulePath(String... paths) {
-        if (isNotEmpty(paths)) {
-            modulePathStrings(Arrays.asList(paths));
-        }
-        return this;
+        return modulePathStrings(Arrays.asList(paths));
     }
 
     /**
@@ -637,43 +550,9 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions modulePathStrings(Collection<String> paths) {
-        return addPathOption(COMPILE_OPTION_MODULE_PATH, paths);
-    }
-
-    /**
-     * Specify where to find input source files for multiple modules
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions moduleSourcePathStrings(Collection<String> paths) {
-        return addPathOption("--module-source-path", paths);
-    }
-
-    /**
-     * Specify where to find input source files for multiple modules
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions moduleSourcePathPaths(Collection<Path> paths) {
-        if (isNotEmpty(paths)) {
-            return moduleSourcePathStrings(paths.stream().map(Path::toString).toList());
-        }
-        return this;
-    }
-
-    /**
-     * Specify where to find input source files for multiple modules
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions moduleSourcePath(Collection<File> paths) {
-        if (isNotEmpty(paths)) {
-            return moduleSourcePathStrings(paths.stream().map(File::getPath).toList());
-        }
+    public JavacOptions modulePathStrings(List<String> paths) {
+        add(COMPILE_OPTION_MODULE_PATH);
+        add(FileUtils.joinPaths(paths));
         return this;
     }
 
@@ -683,11 +562,8 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 1.5.18
      */
-    public JavacOptions moduleSourcePath(File... paths) {
-        if (isNotEmpty(paths)) {
-            moduleSourcePath(Arrays.asList(paths));
-        }
-        return this;
+    public JavacOptions moduleSourcePath(File path) {
+        return moduleSourcePath(path.getAbsolutePath());
     }
 
     /**
@@ -696,11 +572,8 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions moduleSourcePath(String... paths) {
-        if (isNotEmpty(paths)) {
-            moduleSourcePathStrings(Arrays.asList(paths));
-        }
-        return this;
+    public JavacOptions moduleSourcePath(Path path) {
+        return moduleSourcePath(path.toFile());
     }
 
     /**
@@ -709,10 +582,9 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions moduleSourcePath(Path... paths) {
-        if (isNotEmpty(paths)) {
-            moduleSourcePathPaths(Arrays.asList(paths));
-        }
+    public JavacOptions moduleSourcePath(String path) {
+        add("--module-source-path");
+        add(path);
         return this;
     }
 
@@ -768,10 +640,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 1.5.18
      */
     public JavacOptions processors(String... classnames) {
-        if (isNotEmpty(classnames)) {
-            processors(Arrays.asList(classnames));
-        }
-        return this;
+        return processors(Arrays.asList(classnames));
     }
 
     /**
@@ -780,8 +649,10 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 1.5.18
      */
-    public JavacOptions processors(Collection<String> classnames) {
-        return addCommaSeparatedOption("-processor", classnames);
+    public JavacOptions processors(List<String> classnames) {
+        add("-processor");
+        add(StringUtils.join(classnames, ","));
+        return this;
     }
 
     /**
@@ -790,11 +661,8 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 1.5.18
      */
-    public JavacOptions processorModulePath(File... paths) {
-        if (isNotEmpty(paths)) {
-            processorModulePath(Arrays.asList(paths));
-        }
-        return this;
+    public JavacOptions processorModulePath(File path) {
+        return processorModulePath(path.getAbsolutePath());
     }
 
     /**
@@ -803,11 +671,8 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions processorModulePath(Path... paths) {
-        if (isNotEmpty(paths)) {
-            processorModulePathPaths(Arrays.asList(paths));
-        }
-        return this;
+    public JavacOptions processorModulePath(Path path) {
+        return processorModulePath(path.toFile());
     }
 
     /**
@@ -816,46 +681,9 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions processorModulePath(String... paths) {
-        if (isNotEmpty(paths)) {
-            processorModulePathStrings(Arrays.asList(paths));
-        }
-        return this;
-    }
-
-    /**
-     * Specify a module path where to find annotation processors
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions processorModulePathPaths(Collection<Path> paths) {
-        if (isNotEmpty(paths)) {
-            return processorModulePathStrings(paths.stream().map(Path::toString).toList());
-        }
-        return this;
-    }
-
-    /**
-     * Specify a module path where to find annotation processors
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions processorModulePathStrings(Collection<String> paths) {
-        return addPathOption("--processor-module-path", paths);
-    }
-
-    /**
-     * Specify a module path where to find annotation processors
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions processorModulePath(Collection<File> paths) {
-        if (isNotEmpty(paths)) {
-            return processorModulePathStrings(paths.stream().map(File::getAbsolutePath).toList());
-        }
+    public JavacOptions processorModulePath(String path) {
+        add("--processor-module-path");
+        add(path);
         return this;
     }
 
@@ -865,11 +693,8 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 1.5.18
      */
-    public JavacOptions processorPath(String... paths) {
-        if (isNotEmpty(paths)) {
-            processorPathStrings(Arrays.asList(paths));
-        }
-        return this;
+    public JavacOptions processorPath(File path) {
+        return processorPath(path.getAbsolutePath());
     }
 
     /**
@@ -878,11 +703,8 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions processorPath(File... paths) {
-        if (isNotEmpty(paths)) {
-            processorPath(Arrays.asList(paths));
-        }
-        return this;
+    public JavacOptions processorPath(Path path) {
+        return processorPath(path.toFile());
     }
 
     /**
@@ -891,51 +713,14 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions processorPath(Path... paths) {
-        if (isNotEmpty(paths)) {
-            processorPathPaths(Arrays.asList(paths));
-        }
+    public JavacOptions processorPath(String path) {
+        add("--processor-path");
+        add(path);
         return this;
     }
 
     /**
-     * Specify where to find annotation processors
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions processorPathStrings(Collection<String> paths) {
-        return addPathOption("--processor-path", paths);
-    }
-
-    /**
-     * Specify where to find annotation processors
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions processorPath(Collection<File> paths) {
-        if (isNotEmpty(paths)) {
-            return processorPathStrings(paths.stream().map(File::getAbsolutePath).toList());
-        }
-        return this;
-    }
-
-    /**
-     * Specify where to find annotation processors
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions processorPathPaths(Collection<Path> paths) {
-        if (isNotEmpty(paths)) {
-            return processorPathStrings(paths.stream().map(Path::toString).toList());
-        }
-        return this;
-    }
-
-    /**
-     * Check that the API used is available in the specified profile
+     * Check that API used is available in the specified profile
      *
      * @return this list of options
      * @since 1.5.18
@@ -999,11 +784,8 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 1.5.18
      */
-    public JavacOptions upgradeModulePath(File... paths) {
-        if (isNotEmpty(paths)) {
-            upgradeModulePath(Arrays.asList(paths));
-        }
-        return this;
+    public JavacOptions upgradeModulePath(File path) {
+        return upgradeModulePath(path.getAbsolutePath());
     }
 
     /**
@@ -1012,11 +794,8 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions upgradeModulePath(Path... paths) {
-        if (isNotEmpty(paths)) {
-            upgradeModulePathPaths(Arrays.asList(paths));
-        }
-        return this;
+    public JavacOptions upgradeModulePath(Path path) {
+        return upgradeModulePath(path.toFile());
     }
 
     /**
@@ -1025,46 +804,9 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.1
      */
-    public JavacOptions upgradeModulePath(String... paths) {
-        if (isNotEmpty(paths)) {
-            upgradeModulePathStrings(Arrays.asList(paths));
-        }
-        return this;
-    }
-
-    /**
-     * Override location of upgradeable modules
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions upgradeModulePathStrings(Collection<String> paths) {
-        return addPathOption("--upgrade-module-path", paths);
-    }
-
-    /**
-     * Override location of upgradeable modules
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions upgradeModulePath(Collection<File> paths) {
-        if (isNotEmpty(paths)) {
-            return upgradeModulePathStrings(paths.stream().map(File::getAbsolutePath).toList());
-        }
-        return this;
-    }
-
-    /**
-     * Override location of upgradeable modules
-     *
-     * @return this list of options
-     * @since 2.3.1
-     */
-    public JavacOptions upgradeModulePathPaths(Collection<Path> paths) {
-        if (isNotEmpty(paths)) {
-            return upgradeModulePathStrings(paths.stream().map(Path::toString).toList());
-        }
+    public JavacOptions upgradeModulePath(String path) {
+        add("--upgrade-module-path");
+        add(path);
         return this;
     }
 
@@ -1097,10 +839,7 @@ public class JavacOptions extends ArrayList<String> {
      * @since 2.3.1
      */
     public JavacOptions xLint(XLintKey... keys) {
-        if (isNotEmpty(keys)) {
-            xLint(Arrays.asList(keys));
-        }
-        return this;
+        return xLint(Arrays.asList(keys));
     }
 
     /**
@@ -1109,12 +848,9 @@ public class JavacOptions extends ArrayList<String> {
      * @return this list of options
      * @since 2.3.1
      */
-    public JavacOptions xLint(Collection<XLintKey> keys) {
-        if (isNotEmpty(keys)) {
+    public JavacOptions xLint(List<XLintKey> keys) {
         return addXLintOption(keys, "");
     }
-        return this;
-    }
 
     /**
      * Warning categories to disable
@@ -1123,33 +859,30 @@ public class JavacOptions extends ArrayList<String> {
      * @since 2.3.1
      */
     public JavacOptions xLintDisable(XLintKey... keys) {
-        if (isNotEmpty(keys)) {
-            xLintDisable(Arrays.asList(keys));
+        return xLintDisable(Arrays.asList(keys));
     }
-        return this;
-    }
-
     /**
      * Warning categories to disable
      *
      * @return this list of options
      * @since 2.3.1
      */
-    public JavacOptions xLintDisable(Collection<XLintKey> keys) {
-        if (isNotEmpty(keys)) {
+    public JavacOptions xLintDisable(List<XLintKey> keys) {
         return addXLintOption(keys, "-");
     }
+
+
+    private JavacOptions addXLintOption(List<XLintKey> keys, String prefix) {
+        if (keys == null || keys.isEmpty()) {
             return this;
         }
 
-    private JavacOptions addXLintOption(Collection<XLintKey> keys, String prefix) {
-        if (isNotEmpty(keys)) {
-            var keyString = keys.stream()
-                    .map(key -> key.name().replace('_', '-').toLowerCase())
-                    .collect(Collectors.joining("," + prefix, prefix, ""));
+        var formattedKeys = keys.stream()
+                .map(key -> prefix + key.name().replace('_', '-').toLowerCase())
+                .collect(Collectors.joining(",", "-Xlint:", ""));
 
-            add("-Xlint:" + keyString);
-        }
+        add(formattedKeys);
         return this;
     }
+
 }