Convert org.jetbrains.skiko.Library to Kotlin

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/Library.kt

-package org.jetbrains.skiko;
+package org.jetbrains.skiko
 
-import java.io.File;
-import java.io.InputStream;
-import java.io.IOException;
-import java.net.URL;
-import java.net.URISyntaxException;
-import java.nio.file.Files;
-import java.nio.file.StandardCopyOption;
+import java.io.File
+import java.io.IOException
+import java.net.URISyntaxException
+import java.nio.file.Files
+import java.nio.file.StandardCopyOption
 
 // based on https://github.com/JetBrains/skija/blob/bc6e0531021e4ff839c07196e0336d6456ed7520/src/main/java/org/jetbrains/skija/Library.java
-public class Library {
-    public static boolean _loaded = false;
+object Library {
+    var _loaded = false
 
     // https://github.com/adamheinrich/native-utils/blob/e6a39489662846a77504634b6fafa4995ede3b1d/src/main/java/cz/adamh/utils/NativeUtils.java
-    public static void load(String resourcePath, String name) {
-        if (_loaded) return;
+    fun load(resourcePath: String, name: String) {
+        if (_loaded) return
         try {
-            File file;
-            String fileName = _getPrefix() + name + "." + _getExtension();
-
-            URL url = Library.class.getResource(resourcePath + fileName);
-            if (url == null)
-                throw new IllegalArgumentException("Library " + fileName + " is not found in " + resourcePath);
-            else if (url.getProtocol() == "file")
-                try {
-                    // System.out.println("Loading " + url);
-                    file = new File(url.toURI());
-                } catch (URISyntaxException e){
-                    throw new RuntimeException(e);
-                }
-            else
-                try (InputStream is = url.openStream()) {
-                    File tempDir = new File(System.getProperty("java.io.tmpdir"), "skija_" + System.nanoTime());
-                    tempDir.mkdirs();
-                    tempDir.deleteOnExit();
-                    file = new File(tempDir, fileName);
-                    file.deleteOnExit();
-                    Files.copy(is, file.toPath(), StandardCopyOption.REPLACE_EXISTING);
-                    // System.out.println("Loading " + url + " from " + file);
-                }
-
-            System.load(file.getAbsolutePath());
-            _loaded = true;
-        } catch (IOException e) {
-            throw new RuntimeException(e);
+            var file: File
+            val fileName = _getPrefix() + name + "." + _getExtension()
+            val url = Library::class.java.getResource(resourcePath + fileName)
+            // System.out.println("Loading " + url);
+            requireNotNull(url) { "Library $fileName is not found in $resourcePath" }
+            if (url.protocol === "file") file = try {
+                // System.out.println("Loading " + url);
+                File(url.toURI())
+            } catch (e: URISyntaxException) {
+                throw RuntimeException(e)
+            } else url.openStream().use { `is` ->
+                val tempDir = File(System.getProperty("java.io.tmpdir"), "skija_" + System.nanoTime())
+                tempDir.mkdirs()
+                tempDir.deleteOnExit()
+                file = File(tempDir, fileName)
+                file.deleteOnExit()
+                Files.copy(`is`, file.toPath(), StandardCopyOption.REPLACE_EXISTING)
+            }
+            System.load(file.absolutePath)
+            _loaded = true
+        } catch (e: IOException) {
+            throw RuntimeException(e)
         }
     }
 
-    public static String _getPrefix() {
-        String os = System.getProperty("os.name");
-        String lowerCaseOs = os.toLowerCase();
-        if (lowerCaseOs.contains("windows")) return "";
-        return "lib";
+    fun _getPrefix(): String {
+        val os = System.getProperty("os.name")
+        val lowerCaseOs = os.toLowerCase()
+        return if (lowerCaseOs.contains("windows")) "" else "lib"
     }
 
-    public static String _getExtension() {
-        String os = System.getProperty("os.name");
-        if (os == null) throw new RuntimeException("Unknown operation system");
-        String lowerCaseOs = os.toLowerCase();
-        if (lowerCaseOs.contains("mac") || lowerCaseOs.contains("darwin")) return "dylib";
-        if (lowerCaseOs.contains("windows")) return "dll";
-        if (lowerCaseOs.contains("nux")) return "so";
-
-        throw new RuntimeException("Unknown operation system: " + os);
+    fun _getExtension(): String {
+        val os = System.getProperty("os.name") ?: throw RuntimeException("Unknown operation system")
+        val lowerCaseOs = os.toLowerCase()
+        if (lowerCaseOs.contains("mac") || lowerCaseOs.contains("darwin")) return "dylib"
+        if (lowerCaseOs.contains("windows")) return "dll"
+        if (lowerCaseOs.contains("nux")) return "so"
+        throw RuntimeException("Unknown operation system: $os")
     }
-}
+}
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