private static File findNativeLibrary()

in src/main/java/org/apache/commons/crypto/NativeCodeLoader.java [153:199]
33 lines of code
7 McCabe index (conditional complexity)

    private static File findNativeLibrary() {
        // Get the properties once
        final Properties props = Utils.getDefaultProperties();

        // Try to load the library in commons-crypto.lib.path */
        String nativeLibraryPath = props.getProperty(Crypto.LIB_PATH_KEY);
        String nativeLibraryName = props.getProperty(Crypto.LIB_NAME_KEY, System.mapLibraryName(NATIVE_LIBNAME));

        debug("%s nativeLibraryPath %s = %s", SIMPLE_NAME, Crypto.LIB_PATH_KEY, nativeLibraryPath);
        debug("%s nativeLibraryName %s = %s", SIMPLE_NAME, Crypto.LIB_NAME_KEY, nativeLibraryName);

        if (nativeLibraryPath != null) {
            final File nativeLib = new File(nativeLibraryPath, nativeLibraryName);
            final boolean exists = nativeLib.exists();
            debug("%s nativeLib %s exists = %s", SIMPLE_NAME, nativeLib, exists);
            if (exists) {
                return nativeLib;
            }
        }

        // Load an OS-dependent native library inside a jar file
        nativeLibraryPath = "/org/apache/commons/crypto/native/" + OsInfo.getNativeLibFolderPathForCurrentOS();
        debug("%s nativeLibraryPath = %s", SIMPLE_NAME, nativeLibraryPath);
        final String resource = nativeLibraryPath + RESOURCE_PATH_SEPARATOR + nativeLibraryName;
        boolean hasNativeLib = hasResource(resource);
        debug("%s resource %s exists = %s", SIMPLE_NAME, resource, hasNativeLib);
        if (!hasNativeLib) {
            final String altName = NATIVE_LIBNAME_ALT;
            if (OsInfo.getOSName().equals("Mac") && hasResource(nativeLibraryPath + RESOURCE_PATH_SEPARATOR + altName)) {
                // Fix for openjdk7 for Mac
                nativeLibraryName = altName;
                hasNativeLib = true;
            }
        }

        if (!hasNativeLib) {
            final String errorMessage = String.format("No native library is found for os.name=%s and os.arch=%s", OsInfo.getOSName(), OsInfo.getArchName());
            throw new IllegalStateException(errorMessage);
        }

        // Temporary folder for the native lib. Use the value of
        // Crypto.LIB_TEMPDIR_KEY or java.io.tmpdir
        final String tempFolder = new File(props.getProperty(Crypto.LIB_TEMPDIR_KEY, System.getProperty("java.io.tmpdir"))).getAbsolutePath();

        // Extract and load a native library inside the jar file
        return extractLibraryFile(nativeLibraryPath, nativeLibraryName, tempFolder);
    }