Merge branch 'subtree'
[fanfix.git] / src / be / nikiroo / fanfix / Instance.java
index 4dde3fa642b8cfaae5265250e86606b494ec0328..e0a072714a08a35b87f4342a0b4046c0abe0894c 100644 (file)
@@ -8,14 +8,19 @@ import be.nikiroo.fanfix.bundles.Config;
 import be.nikiroo.fanfix.bundles.ConfigBundle;
 import be.nikiroo.fanfix.bundles.StringId;
 import be.nikiroo.fanfix.bundles.StringIdBundle;
+import be.nikiroo.fanfix.bundles.StringIdGuiBundle;
 import be.nikiroo.fanfix.bundles.UiConfig;
 import be.nikiroo.fanfix.bundles.UiConfigBundle;
 import be.nikiroo.fanfix.library.BasicLibrary;
 import be.nikiroo.fanfix.library.CacheLibrary;
 import be.nikiroo.fanfix.library.LocalLibrary;
 import be.nikiroo.fanfix.library.RemoteLibrary;
+import be.nikiroo.fanfix.library.WebLibrary;
 import be.nikiroo.utils.Cache;
 import be.nikiroo.utils.IOUtils;
+import be.nikiroo.utils.Image;
+import be.nikiroo.utils.Proxy;
+import be.nikiroo.utils.TempFiles;
 import be.nikiroo.utils.TraceHandler;
 import be.nikiroo.utils.resources.Bundles;
 
@@ -25,152 +30,154 @@ import be.nikiroo.utils.resources.Bundles;
  * @author niki
  */
 public class Instance {
-       private static ConfigBundle config;
-       private static UiConfigBundle uiconfig;
-       private static StringIdBundle trans;
-       private static DataLoader cache;
-       private static BasicLibrary lib;
-       private static File coverDir;
-       private static File readerTmp;
-       private static File remoteDir;
-       private static String configDir;
-       private static TraceHandler tracer;
-
-       static {
-               // Before we can configure it:
-               tracer = new TraceHandler(true, checkEnv("DEBUG"), false);
+       static private Instance instance;
+       static private Object instancelock = new Object();
+
+       private ConfigBundle config;
+       private UiConfigBundle uiconfig;
+       private StringIdBundle trans;
+       private DataLoader cache;
+       private StringIdGuiBundle transGui;
+       private BasicLibrary lib;
+       private File coverDir;
+       private File readerTmp;
+       private File remoteDir;
+       private String configDir;
+       private TraceHandler tracer;
+       private TempFiles tempFiles;
 
-               // Most of the rest is dependent upon this:
-               config = new ConfigBundle();
+       /**
+        * Initialise the instance -- if already initialised, nothing will happen.
+        * <p>
+        * Before calling this method, you may call
+        * {@link Bundles#setDirectory(String)} if wanted.
+        * <p>
+        * Note that this method will honour some environment variables, the 3 most
+        * important ones probably being:
+        * <ul>
+        * <li><tt>DEBUG</tt>: will enable DEBUG output if set to 1 (or Y or TRUE or
+        * ON, case insensitive)</li>
+        * <li><tt>CONFIG_DIR</tt>: will use this directory as configuration
+        * directory (supports $HOME notation, defaults to $HOME/.fanfix</li>
+        * <li><tt>BOOKS_DIR</tt>: will use this directory as library directory
+        * (supports $HOME notation, defaults to $HOME/Books</li>
+        * </ul>
+        */
+       static public void init() {
+               init(false);
+       }
 
-               configDir = System.getProperty("CONFIG_DIR");
-               if (configDir == null) {
-                       configDir = System.getenv("CONFIG_DIR");
+       /**
+        * Initialise the instance -- if already initialised, nothing will happen
+        * unless you pass TRUE to <tt>force</tt>.
+        * <p>
+        * Before calling this method, you may call
+        * {@link Bundles#setDirectory(String)} if wanted.
+        * <p>
+        * Note: forcing the initialisation can be dangerous, so make sure to only
+        * make it under controlled circumstances -- for instance, at the start of
+        * the program, you could call {@link Instance#init()}, change some settings
+        * because you want to force those settings (it will also forbid users to
+        * change them!) and then call {@link Instance#init(boolean)} with
+        * <tt>force</tt> set to TRUE.
+        * 
+        * @param force
+        *            force the initialisation even if already initialised
+        */
+       static public void init(boolean force) {
+               synchronized (instancelock) {
+                       if (instance == null || force) {
+                               instance = new Instance();
+                       }
                }
 
-               if (configDir == null) {
-                       configDir = new File(System.getProperty("user.home"), ".fanfix")
-                                       .getPath();
-               }
+       }
 
-               if (!new File(configDir).exists()) {
-                       new File(configDir).mkdirs();
-               } else {
-                       Bundles.setDirectory(configDir);
-               }
+       /**
+        * Force-initialise the {@link Instance} to a known value.
+        * <p>
+        * Usually for DEBUG/Test purposes.
+        * 
+        * @param instance
+        *            the actual Instance to use
+        */
+       static public void init(Instance instance) {
+               Instance.instance = instance;
+       }
 
-               try {
-                       config = new ConfigBundle();
-                       config.updateFile(configDir);
-               } catch (IOException e) {
-                       tracer.error(e);
-               }
-               try {
-                       uiconfig = new UiConfigBundle();
-                       uiconfig.updateFile(configDir);
-               } catch (IOException e) {
-                       tracer.error(e);
-               }
+       /**
+        * The (mostly unique) instance of this {@link Instance}.
+        * 
+        * @return the (mostly unique) instance
+        */
+       public static Instance getInstance() {
+               return instance;
+       }
 
-               // No updateFile for this one! (we do not want the user to have custom
-               // translations that won't accept updates from newer versions)
-               trans = new StringIdBundle(getLang());
+       /**
+        * Actually initialise the instance.
+        * <p>
+        * Before calling this method, you may call
+        * {@link Bundles#setDirectory(String)} if wanted.
+        */
+       protected Instance() {
+               // Before we can configure it:
+               Boolean debug = checkEnv("DEBUG");
+               boolean trace = debug != null && debug;
+               tracer = new TraceHandler(true, trace, trace);
 
-               // Fix an old bug (we used to store custom translation files by
-               // default):
-               if (trans.getString(StringId.INPUT_DESC_CBZ) == null) {
-                       // TODO: create the deleteFile method
-                       // trans.deleteFile(configDir);
+               // config dir:
+               configDir = getConfigDir();
+               if (!new File(configDir).exists()) {
+                       new File(configDir).mkdirs();
                }
 
-               Bundles.setDirectory(configDir);
-
-               uiconfig = new UiConfigBundle();
-               trans = new StringIdBundle(getLang());
-
-               boolean debug = Instance.getConfig()
-                               .getBoolean(Config.DEBUG_ERR, false);
-               boolean trace = Instance.getConfig().getBoolean(Config.DEBUG_TRACE,
-                               false);
-               coverDir = getFile(Config.DEFAULT_COVERS_DIR);
-               File tmp = getFile(Config.CACHE_DIR);
-               readerTmp = getFile(UiConfig.CACHE_DIR_LOCAL_READER);
-               remoteDir = new File(configDir, "remote");
+               // Most of the rest is dependent upon this:
+               createConfigs(configDir, false);
 
-               if (checkEnv("NOUTF")) {
-                       trans.setUnicode(false);
-               }
+               // Proxy support
+               Proxy.use(config.getString(Config.NETWORK_PROXY));
 
-               if (checkEnv("DEBUG")) {
-                       debug = true;
+               // update tracer:
+               if (debug == null) {
+                       debug = config.getBoolean(Config.DEBUG_ERR, false);
+                       trace = config.getBoolean(Config.DEBUG_TRACE, false);
                }
 
                tracer = new TraceHandler(true, debug, trace);
 
-               String remoteLib = config.getString(Config.DEFAULT_LIBRARY);
-               if (remoteLib == null || remoteLib.trim().isEmpty()) {
-                       try {
-                               lib = new LocalLibrary(getFile(Config.LIBRARY_DIR));
-                       } catch (Exception e) {
-                               tracer.error(new IOException(
-                                               "Cannot create library for directory: "
-                                                               + getFile(Config.LIBRARY_DIR), e));
-                       }
-               } else {
-                       int pos = remoteLib.lastIndexOf(":");
-                       if (pos >= 0) {
-                               String port = remoteLib.substring(pos + 1).trim();
-                               remoteLib = remoteLib.substring(0, pos);
-                               pos = remoteLib.lastIndexOf(":");
-                               if (pos >= 0) {
-                                       String host = remoteLib.substring(pos + 1).trim();
-                                       String key = remoteLib.substring(0, pos).trim();
-
-                                       try {
-                                               tracer.trace("Selecting remote library " + host + ":"
-                                                               + port);
-                                               lib = new RemoteLibrary(key, host,
-                                                               Integer.parseInt(port));
-                                               lib = new CacheLibrary(getRemoteDir(host), lib);
-
-                                       } catch (Exception e) {
-                                       }
-                               }
-                       }
-
-                       if (lib == null) {
-                               tracer.error(new IOException(
-                                               "Cannot create remote library for: "
-                                                               + getFile(Config.DEFAULT_LIBRARY)));
-                       }
-               }
-
-               // Could have used: System.getProperty("java.io.tmpdir")
-               if (tmp == null) {
-                       tmp = new File(configDir, "tmp");
-               }
-               if (readerTmp == null) {
-                       readerTmp = new File(configDir, "tmp-reader");
-               }
-               //
+               // default Library
+               remoteDir = new File(configDir, "remote");
+               lib = createDefaultLibrary(remoteDir);
 
-               if (coverDir != null && !coverDir.exists()) {
-                       tracer.error(new IOException(
-                                       "The 'default covers' directory does not exists: "
-                                                       + coverDir));
-                       coverDir = null;
-               }
+               // create cache and TMP
+               File tmp = getFile(Config.CACHE_DIR, configDir, "tmp");
+               Image.setTemporaryFilesRoot(new File(tmp.getParent(), "tmp.images"));
 
+               String ua = config.getString(Config.NETWORK_USER_AGENT, "");
                try {
-                       String ua = config.getString(Config.USER_AGENT);
-                       int hours = config.getInteger(Config.CACHE_MAX_TIME_CHANGING, -1);
-                       int hoursLarge = config
-                                       .getInteger(Config.CACHE_MAX_TIME_STABLE, -1);
-
+                       int hours = config.getInteger(Config.CACHE_MAX_TIME_CHANGING, 0);
+                       int hoursLarge = config.getInteger(Config.CACHE_MAX_TIME_STABLE, 0);
                        cache = new DataLoader(tmp, ua, hours, hoursLarge);
                } catch (IOException e) {
                        tracer.error(new IOException(
                                        "Cannot create cache (will continue without cache)", e));
+                       cache = new DataLoader(ua);
+               }
+
+               cache.setTraceHandler(tracer);
+
+               // readerTmp / coverDir
+               readerTmp = getFile(UiConfig.CACHE_DIR_LOCAL_READER, configDir,
+                               "tmp-reader");
+               coverDir = getFile(Config.DEFAULT_COVERS_DIR, configDir, "covers");
+               coverDir.mkdirs();
+
+               try {
+                       tempFiles = new TempFiles("fanfix");
+               } catch (IOException e) {
+                       tracer.error(
+                                       new IOException("Cannot create temporary directory", e));
                }
        }
 
@@ -181,7 +188,7 @@ public class Instance {
         * 
         * @return the traces handler (never NULL)
         */
-       public static TraceHandler getTraceHandler() {
+       public TraceHandler getTraceHandler() {
                return tracer;
        }
 
@@ -191,12 +198,13 @@ public class Instance {
         * @param tracer
         *            the new traces handler or NULL
         */
-       public static void setTraceHandler(TraceHandler tracer) {
+       public void setTraceHandler(TraceHandler tracer) {
                if (tracer == null) {
                        tracer = new TraceHandler(false, false, false);
                }
 
-               Instance.tracer = tracer;
+               this.tracer = tracer;
+               cache.setTraceHandler(tracer);
        }
 
        /**
@@ -204,7 +212,7 @@ public class Instance {
         * 
         * @return the configuration service
         */
-       public static ConfigBundle getConfig() {
+       public ConfigBundle getConfig() {
                return config;
        }
 
@@ -213,34 +221,83 @@ public class Instance {
         * 
         * @return the configuration service
         */
-       public static UiConfigBundle getUiConfig() {
+       public UiConfigBundle getUiConfig() {
                return uiconfig;
        }
 
+       /**
+        * Reset the configuration.
+        * 
+        * @param resetTrans
+        *            also reset the translation files
+        */
+       public void resetConfig(boolean resetTrans) {
+               String dir = Bundles.getDirectory();
+               Bundles.setDirectory(null);
+               try {
+                       try {
+                               ConfigBundle config = new ConfigBundle();
+                               config.updateFile(configDir);
+                       } catch (IOException e) {
+                               tracer.error(e);
+                       }
+                       try {
+                               UiConfigBundle uiconfig = new UiConfigBundle();
+                               uiconfig.updateFile(configDir);
+                       } catch (IOException e) {
+                               tracer.error(e);
+                       }
+
+                       if (resetTrans) {
+                               try {
+                                       StringIdBundle trans = new StringIdBundle(null);
+                                       trans.updateFile(configDir);
+                               } catch (IOException e) {
+                                       tracer.error(e);
+                               }
+                       }
+               } finally {
+                       Bundles.setDirectory(dir);
+               }
+       }
+
        /**
         * Get the (unique) {@link DataLoader} for the program.
         * 
         * @return the {@link DataLoader}
         */
-       public static DataLoader getCache() {
+       public DataLoader getCache() {
                return cache;
        }
 
        /**
         * Get the (unique) {link StringIdBundle} for the program.
+        * <p>
+        * This is used for the translations of the core parts of Fanfix.
         * 
         * @return the {link StringIdBundle}
         */
-       public static StringIdBundle getTrans() {
+       public StringIdBundle getTrans() {
                return trans;
        }
 
        /**
-        * Get the (unique) {@link LocalLibrary} for the program.
+        * Get the (unique) {link StringIdGuiBundle} for the program.
+        * <p>
+        * This is used for the translations of the GUI parts of Fanfix.
+        * 
+        * @return the {link StringIdGuiBundle}
+        */
+       public StringIdGuiBundle getTransGui() {
+               return transGui;
+       }
+
+       /**
+        * Get the (unique) {@link BasicLibrary} for the program.
         * 
-        * @return the {@link LocalLibrary}
+        * @return the {@link BasicLibrary}
         */
-       public static BasicLibrary getLibrary() {
+       public BasicLibrary getLibrary() {
                if (lib == null) {
                        throw new NullPointerException("We don't have a library to return");
                }
@@ -248,12 +305,24 @@ public class Instance {
                return lib;
        }
 
+       /**
+        * Change the default {@link BasicLibrary} for this program.
+        * <p>
+        * Be careful.
+        * 
+        * @param lib
+        *            the new {@link BasicLibrary}
+        */
+       public void setLibrary(BasicLibrary lib) {
+               this.lib = lib;
+       }
+
        /**
         * Return the directory where to look for default cover pages.
         * 
         * @return the default covers directory
         */
-       public static File getCoverDir() {
+       public File getCoverDir() {
                return coverDir;
        }
 
@@ -262,7 +331,7 @@ public class Instance {
         * 
         * @return the directory
         */
-       public static File getReaderDir() {
+       public File getReaderDir() {
                return readerTmp;
        }
 
@@ -275,10 +344,30 @@ public class Instance {
         * 
         * @return the directory
         */
-       public static File getRemoteDir(String host) {
+       public File getRemoteDir(String host) {
+               return getRemoteDir(remoteDir, host);
+       }
+
+       /**
+        * Return the directory where to store temporary files for the remote
+        * {@link LocalLibrary}.
+        * 
+        * @param remoteDir
+        *            the base remote directory
+        * @param host
+        *            the remote for this host
+        * 
+        * @return the directory
+        */
+       private File getRemoteDir(File remoteDir, String host) {
                remoteDir.mkdirs();
 
                if (host != null) {
+                       host = host.replace("fanfix://", "");
+                       host = host.replace("http://", "");
+                       host = host.replace("https://", "");
+                       host = host.replaceAll("[^a-zA-Z0-9=+.-]", "_");
+                       
                        return new File(remoteDir, host);
                }
 
@@ -290,13 +379,13 @@ public class Instance {
         * 
         * @return TRUE if we need to
         */
-       public static boolean isVersionCheckNeeded() {
+       public boolean isVersionCheckNeeded() {
                try {
-                       long wait = config.getInteger(Config.UPDATE_INTERVAL, 1) * 24 * 60
-                                       * 60 * 1000;
+                       long wait = config.getInteger(Config.NETWORK_UPDATE_INTERVAL, 0)
+                                       * 24 * 60 * 60 * 1000;
                        if (wait >= 0) {
-                               String lastUpString = IOUtils.readSmallFile(new File(configDir,
-                                               "LAST_UPDATE"));
+                               String lastUpString = IOUtils
+                                               .readSmallFile(new File(configDir, "LAST_UPDATE"));
                                long delay = new Date().getTime()
                                                - Long.parseLong(lastUpString);
                                if (delay > wait) {
@@ -316,7 +405,7 @@ public class Instance {
        /**
         * Notify that we checked for a new version of Fanfix.
         */
-       public static void setVersionChecked() {
+       public void setVersionChecked() {
                try {
                        IOUtils.writeSmallFile(new File(configDir), "LAST_UPDATE",
                                        Long.toString(new Date().getTime()));
@@ -325,36 +414,196 @@ public class Instance {
                }
        }
 
+       /**
+        * The facility to use temporary files in this program.
+        * <p>
+        * <b>MUST</b> be closed at end of program.
+        * 
+        * @return the facility
+        */
+       public TempFiles getTempFiles() {
+               return tempFiles;
+       }
+
+       /**
+        * The configuration directory (will check, in order of preference, the
+        * system properties, the environment and then defaults to
+        * {@link Instance#getHome()}/.fanfix).
+        * 
+        * @return the config directory
+        */
+       private String getConfigDir() {
+               String configDir = System.getProperty("CONFIG_DIR");
+
+               if (configDir == null) {
+                       configDir = System.getenv("CONFIG_DIR");
+               }
+
+               if (configDir == null) {
+                       configDir = new File(getHome(), ".fanfix").getPath();
+               }
+
+               return configDir;
+       }
+
+       /**
+        * Create the config variables ({@link Instance#config},
+        * {@link Instance#uiconfig}, {@link Instance#trans} and
+        * {@link Instance#transGui}).
+        * 
+        * @param configDir
+        *            the directory where to find the configuration files
+        * @param refresh
+        *            TRUE to reset the configuration files from the default
+        *            included ones
+        */
+       private void createConfigs(String configDir, boolean refresh) {
+               if (!refresh) {
+                       Bundles.setDirectory(configDir);
+               }
+
+               try {
+                       config = new ConfigBundle();
+                       config.updateFile(configDir);
+               } catch (IOException e) {
+                       tracer.error(e);
+               }
+
+               try {
+                       uiconfig = new UiConfigBundle();
+                       uiconfig.updateFile(configDir);
+               } catch (IOException e) {
+                       tracer.error(e);
+               }
+
+               // No updateFile for this one! (we do not want the user to have custom
+               // translations that won't accept updates from newer versions)
+               trans = new StringIdBundle(getLang());
+               transGui = new StringIdGuiBundle(getLang());
+
+               // Fix an old bug (we used to store custom translation files by
+               // default):
+               if (trans.getString(StringId.INPUT_DESC_CBZ) == null) {
+                       trans.deleteFile(configDir);
+               }
+
+               Boolean noutf = checkEnv("NOUTF");
+               if (noutf != null && noutf) {
+                       trans.setUnicode(false);
+                       transGui.setUnicode(false);
+               }
+
+               Bundles.setDirectory(configDir);
+       }
+
+       /**
+        * Create the default library as specified by the config.
+        * 
+        * @param remoteDir
+        *            the base remote directory if needed
+        * 
+        * @return the default {@link BasicLibrary}
+        */
+       private BasicLibrary createDefaultLibrary(File remoteDir) {
+               BasicLibrary lib = null;
+
+               boolean useRemote = config.getBoolean(Config.REMOTE_LIBRARY_ENABLED,
+                               false);
+               if (useRemote) {
+                       String host = null;
+                       int port = -1;
+                       try {
+                               host = config.getString(Config.REMOTE_LIBRARY_HOST,
+                                               "fanfix://localhost");
+                               port = config.getInteger(Config.REMOTE_LIBRARY_PORT, -1);
+                               String key = config.getString(Config.REMOTE_LIBRARY_KEY);
+
+                               if (!host.startsWith("http://") && !host.startsWith("https://")
+                                               && !host.startsWith("fanfix://")) {
+                                       host = "fanfix://" + host;
+                               }
+
+                               tracer.trace("Selecting remote library " + host + ":" + port);
+
+                               if (host.startsWith("fanfix://")) {
+                                       lib = new RemoteLibrary(key, host, port);
+                               } else {
+                                       lib = new WebLibrary(key, host, port);
+                               }
+
+                               lib = new CacheLibrary(getRemoteDir(remoteDir, host), lib,
+                                               uiconfig);
+                       } catch (Exception e) {
+                               tracer.error(
+                                               new IOException("Cannot create remote library for: "
+                                                               + host + ":" + port, e));
+                       }
+               } else {
+                       String libDir = System.getenv("BOOKS_DIR");
+                       if (libDir == null || libDir.isEmpty()) {
+                               libDir = getFile(Config.LIBRARY_DIR, configDir, "$HOME/Books")
+                                               .getPath();
+                       }
+                       try {
+                               lib = new LocalLibrary(new File(libDir), config);
+                       } catch (Exception e) {
+                               tracer.error(new IOException(
+                                               "Cannot create library for directory: " + libDir, e));
+                       }
+               }
+
+               return lib;
+       }
+
        /**
         * Return a path, but support the special $HOME variable.
         * 
-        * @return the path
+        * @param id
+        *            the key for the path, which may contain "$HOME"
+        * @param configDir
+        *            the directory to use as base if not absolute
+        * @param def
+        *            the default value if none (will be configDir-rooted if needed)
+        * @return the path, with expanded "$HOME" if needed
         */
-       private static File getFile(Config id) {
-               return getFile(config.getString(id));
+       protected File getFile(Config id, String configDir, String def) {
+               String path = config.getString(id, def);
+               return getFile(path, configDir);
        }
 
        /**
         * Return a path, but support the special $HOME variable.
         * 
-        * @return the path
+        * @param id
+        *            the key for the path, which may contain "$HOME"
+        * @param configDir
+        *            the directory to use as base if not absolute
+        * @param def
+        *            the default value if none (will be configDir-rooted if needed)
+        * @return the path, with expanded "$HOME" if needed
         */
-       private static File getFile(UiConfig id) {
-               return getFile(uiconfig.getString(id));
+       protected File getFile(UiConfig id, String configDir, String def) {
+               String path = uiconfig.getString(id, def);
+               return getFile(path, configDir);
        }
 
        /**
         * Return a path, but support the special $HOME variable.
         * 
-        * @return the path
+        * @param path
+        *            the path, which may contain "$HOME"
+        * @param configDir
+        *            the directory to use as base if not absolute
+        * @return the path, with expanded "$HOME" if needed
         */
-       private static File getFile(String path) {
+       protected File getFile(String path, String configDir) {
                File file = null;
                if (path != null && !path.isEmpty()) {
                        path = path.replace('/', File.separatorChar);
                        if (path.contains("$HOME")) {
-                               path = path.replace("$HOME",
-                                               "" + System.getProperty("user.home"));
+                               path = path.replace("$HOME", getHome());
+                       } else if (!path.startsWith("/")) {
+                               path = new File(configDir, path).getPath();
                        }
 
                        file = new File(path);
@@ -363,16 +612,63 @@ public class Instance {
                return file;
        }
 
+       /**
+        * Return the home directory from the environment (FANFIX_DIR) or the system
+        * properties.
+        * <p>
+        * The environment variable is tested first. Then, the custom property
+        * "fanfix.home" is tried, followed by the usual "user.home" then
+        * "java.io.tmp" if nothing else is found.
+        * 
+        * @return the home
+        */
+       protected String getHome() {
+               String home = System.getenv("FANFIX_DIR");
+               if (home != null && new File(home).isFile()) {
+                       home = null;
+               }
+
+               if (home == null || home.trim().isEmpty()) {
+                       home = System.getProperty("fanfix.home");
+                       if (home != null && new File(home).isFile()) {
+                               home = null;
+                       }
+               }
+
+               if (home == null || home.trim().isEmpty()) {
+                       home = System.getProperty("user.home");
+                       if (!new File(home).isDirectory()) {
+                               home = null;
+                       }
+               }
+
+               if (home == null || home.trim().isEmpty()) {
+                       home = System.getProperty("java.io.tmpdir");
+                       if (!new File(home).isDirectory()) {
+                               home = null;
+                       }
+               }
+
+               if (home == null) {
+                       home = "";
+               }
+
+               return home;
+       }
+
        /**
         * The language to use for the application (NULL = default system language).
         * 
         * @return the language
         */
-       private static String getLang() {
+       protected String getLang() {
                String lang = config.getString(Config.LANG);
 
-               if (System.getenv("LANG") != null && !System.getenv("LANG").isEmpty()) {
-                       lang = System.getenv("LANG");
+               if (lang == null || lang.isEmpty()) {
+                       if (System.getenv("LANG") != null
+                                       && !System.getenv("LANG").isEmpty()) {
+                               lang = System.getenv("LANG");
+                       }
                }
 
                if (lang != null && lang.isEmpty()) {
@@ -390,7 +686,7 @@ public class Instance {
         * 
         * @return TRUE if it is
         */
-       private static boolean checkEnv(String key) {
+       protected Boolean checkEnv(String key) {
                String value = System.getenv(key);
                if (value != null) {
                        value = value.trim().toLowerCase();
@@ -399,8 +695,10 @@ public class Instance {
                                        || "y".equals(value)) {
                                return true;
                        }
+
+                       return false;
                }
 
-               return false;
+               return null;
        }
 }