Class Native

java/src/main/java/common/Native.java:9–127

import java.util.*;

public class Native {
    private static final String PLATFORM_DIR = getPlatformDir();
    private static final String LIB_NAME = getLibraryName();

    /**
     * Detects the current platform and returns the appropriate natives directory name.
     * Supported platforms: linux_64, linux_arm64, macos_x64, macos_arm64, windows_64
     */
    private static String getPlatformDir() {
        String os = System.getProperty("os.name", "").toLowerCase();
        String arch = System.getProperty("os.arch", "").toLowerCase();

        String osDir;
        if (os.contains("linux")) {
            osDir = "linux";
        } else if (os.contains("mac") || os.contains("darwin")) {
            osDir = "macos";
        } else if (os.contains("win")) {
            osDir = "windows";
        } else {
            throw new UnsupportedOperationException("Unsupported operating system: " + os);
        }

        String archDir;
        if (arch.equals("amd64") || arch.equals("x86_64")) {
            archDir = osDir.equals("linux") ? "64" : "x64";
        } else if (arch.equals("aarch64") || arch.equals("arm64")) {
            archDir = "arm64";
        } else {
            throw new UnsupportedOperationException("Unsupported architecture: " + arch);
        }

        return osDir + "_" + archDir;
    }

    /**
     * Returns the platform-specific library file name.
     */
    private static String getLibraryName() {
        String os = System.getProperty("os.name", "").toLowerCase();
        if (os.contains("win")) {
            return "vw_jni.dll";
        } else if (os.contains("mac") || os.contains("darwin")) {
            return "libvw_jni.dylib";
        } else {
            return "libvw_jni.so";
        }
    }

    private static void try_load_from_path() {
        System.loadLibrary("vw_jni");
    }

    private static void try_load_from_jar() throws IOException {
        String nativesPrefix = "natives/" + PLATFORM_DIR + "/";

        // create temp directory
        Path tempDirectory = Files.createTempDirectory("tmplibvw");