Adjust Library after conversion to Kotlin

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

 package org.jetbrains.skiko
 
 import java.io.File
-import java.io.IOException
-import java.net.URISyntaxException
 import java.nio.file.Files
 import java.nio.file.StandardCopyOption
+import java.util.*
 
 // based on https://github.com/JetBrains/skija/blob/bc6e0531021e4ff839c07196e0336d6456ed7520/src/main/java/org/jetbrains/skija/Library.java
 object Library {
-    var _loaded = false
+    private var loaded = false
 
     // https://github.com/adamheinrich/native-utils/blob/e6a39489662846a77504634b6fafa4995ede3b1d/src/main/java/cz/adamh/utils/NativeUtils.java
+    @Synchronized
     fun load(resourcePath: String, name: String) {
-        if (_loaded) return
-        try {
-            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)
-        }
-    }
-
-    fun _getPrefix(): String {
-        val os = System.getProperty("os.name")
-        val lowerCaseOs = os.toLowerCase()
-        return if (lowerCaseOs.contains("windows")) "" else "lib"
-    }
-
-    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: $os")
+        if (loaded) return
+
+        val libFileName = "$libPrefix$name$libExtension"
+        val url = Library::class.java.getResource(resourcePath + libFileName)
+        // println("Loading " + url);
+        val libFile = when {
+            url == null -> error("Library $libFileName is not found in $resourcePath")
+            url.protocol == "file" -> File(url.toURI())
+            else -> url.openStream().use { input ->
+                val tempRoot = File(System.getProperty("java.io.tmpdir"))
+                val tempDir = tempRoot.resolve("skija_" + System.nanoTime()).apply { mkdirs() }
+                File(tempDir, libFileName).also {
+                    it.deleteOnExit()
+                    Files.copy(input, it.toPath(), StandardCopyOption.REPLACE_EXISTING)
+                }
+            }
+        }
+        System.load(libFile.absolutePath)
+        loaded = true
+    }
+
+    private val libPrefix: String
+        get() = if (currentOS == OS.Windows) "" else "lib"
+
+    private val libExtension: String
+        get() = when (currentOS) {
+            OS.Mac -> ".dylib"
+            OS.Linux -> ".so"
+            OS.Windows -> ".dll"
+        }
+
+    private val currentOS by lazy {
+        val osName = System.getProperty("os.name") ?: error("Unknown OS: 'os.name' is null")
+        val os = osName.toLowerCase(Locale.ROOT)
+        when {
+            os.contains("mac") || os.contains("darwin") -> OS.Mac
+            os.contains("win") -> OS.Windows
+            os.contains("nux") -> OS.Linux
+            else -> error("Unknown OS: $osName")
+        }
+    }
+
+    private enum class OS {
+        Linux, Mac, Windows
     }
 }
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