Added test for native library loading.

Use newer java.nio.Files api for library loading.

core/src/test/java/test/NativeLibraryTest.java

@@ -0,0 +1,67 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+package test;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledOnOs;
+import org.junit.jupiter.api.condition.OS;
+
+import com.github.weisj.darklaf.platform.AbstractLibrary;
+import com.github.weisj.darklaf.platform.macos.MacOSLibrary;
+import com.github.weisj.darklaf.platform.windows.WindowsLibrary;
+
+public class NativeLibraryTest {
+
+    @Test
+    @EnabledOnOs(OS.MAC)
+    public void testMacOSLibraryLoading() {
+        AbstractLibrary library = new TestMacOsLibrary();
+        Assertions.assertDoesNotThrow(library::updateLibrary);
+        Assertions.assertTrue(library.isLoaded(), "MacOS library isn't loaded");
+    }
+
+    @Test
+    @EnabledOnOs(OS.WINDOWS)
+    public void testWindowsLibraryLoading() {
+        AbstractLibrary library = new TestWindowsLibrary();
+        Assertions.assertDoesNotThrow(library::updateLibrary);
+        Assertions.assertTrue(library.isLoaded(), "Windows library isn't loaded");
+    }
+
+    private static class TestMacOsLibrary extends MacOSLibrary {
+        @Override
+        protected void error(final String message, final Throwable e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static class TestWindowsLibrary extends WindowsLibrary {
+        @Override
+        protected void error(final String message, final Throwable e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

native-utils/src/main/java/com/github/weisj/darklaf/platform/NativeUtil.java

@@ -48,7 +48,7 @@ public class NativeUtil {
     /**
      * Temporary directory which will contain the DLLs.
      */
-    private static File temporaryDir;
+    private static Path temporaryDir;
 
     private NativeUtil() {}
 
@@ -85,43 +85,36 @@ public class NativeUtil {
         // Prepare temporary file
         if (temporaryDir == null) {
             temporaryDir = createTempDirectory(NATIVE_FOLDER_PATH_PREFIX);
-            temporaryDir.deleteOnExit();
+            temporaryDir.toFile().deleteOnExit();
         }
 
-        File temp = new File(temporaryDir, filename);
+        Path temp = temporaryDir.resolve(filename);
 
         try (InputStream is = NativeUtil.class.getResourceAsStream(path)) {
-            Files.copy(is, temp.toPath(), StandardCopyOption.REPLACE_EXISTING);
+            Files.copy(is, temp, StandardCopyOption.REPLACE_EXISTING);
         } catch (IOException e) {
-            temp.delete();
+            Files.deleteIfExists(temp);
             throw e;
         } catch (NullPointerException e) {
-            temp.delete();
+            Files.deleteIfExists(temp);
             throw new FileNotFoundException("File " + path + " was not found inside JAR.");
         }
 
         try {
-            System.load(temp.getAbsolutePath());
+            System.load(temp.toAbsolutePath().toString());
         } finally {
             if (isPosixCompliant()) {
                 // Assume POSIX compliant file system, can be deleted after loading
-                temp.delete();
+                Files.deleteIfExists(temp);
             } else {
                 // Assume non-POSIX, and don't delete until last file descriptor closed
-                temp.deleteOnExit();
+                temp.toFile().deleteOnExit();
             }
         }
     }
 
-    private static File createTempDirectory(final String prefix) throws IOException {
+    private static Path createTempDirectory(final String prefix) throws IOException {
-        String tempDir = System.getProperty("java.io.tmpdir");
+        return Files.createTempDirectory(prefix + System.nanoTime());
-        File generatedDir = new File(tempDir, prefix + System.nanoTime());
-
-        if (!generatedDir.mkdir()) {
-            throw new IOException("Failed to create temp directory " + generatedDir.getName());
-        }
-
-        return generatedDir;
     }
 
     private static boolean isPosixCompliant() {