env.java

mywork是rcp开发的很好的例子

        }

        Constants c = Constants.getInstance();

        r = new Resource();

        try {
            r.load(CONSTANTS);
        } catch (ResourceNotFoundException rnfe) {
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "Caught unexpected Exception", rnfe);
            }
        }

        c.set(Constants.NAME, r.get(Constants.NAME, c.get(Constants.NAME)));
        c.set(Constants.VERSION, r.get(Constants.VERSION, c.get(Constants.NAME)));
        c.set(Constants.BUILD, r.get(Constants.BUILD, c.get(Constants.BUILD)));
        c.save();

        String ph = System.getProperty(HTTP_PROXY_HOST);
        String pp = System.getProperty(HTTP_PROXY_PORT,
                String.valueOf(Constants.DEFAULT_HTTP_PROXY_PORT));

        if (ph != null) {
//            URL pu = null;

            try {
                c.set(Constants.PROXY_HTTP,
                        new URL(Constants.PROTOCOL_HTTP + URL_DELIMITER + ph +
                                COLON + pp).toString());
            } catch (MalformedURLException mue) {
                if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
                    LOG.log(Level.FINE, "invalid url: " + ph + " " + pp, mue);
                }
            }
        }

        // xxx: hack; in time, support loading multiple networks
        String nid = c.get(Constants.NETWORK_ID, "").trim();

        if (nid.length() > 0) {
            Properties p = new Properties();

            p.put(Constants.NET_PEER_GROUP_ID_KEY, nid);
            p.put(Constants.NET_PEER_GROUP_NAME_KEY,
                    c.get(Constants.NETWORK_NAME, "").trim());
            p.put(Constants.NET_PEER_GROUP_DESCRIPTION_KEY,
                    c.get(Constants.NETWORK_DESCRIPTION, "").trim());

            try {
                p.store(new FileOutputStream(new File(home + Env.PLATFORM_CONFIG)),
                        Env.PLATFORM_CONFIG_COMMENT);
            } catch (FileNotFoundException fnfe) {
                if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                    LOG.log(Level.SEVERE,
                            "can\'t write " + Env.PLATFORM_CONFIG + " file",
                            fnfe);
                }
            } catch (IOException ioe) {
                if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                    LOG.log(Level.SEVERE,
                            "can\'t write " + Env.PLATFORM_CONFIG + " file", ioe);
                }
            }
        }
        initPreferences(home);

        // xxx: drop the cm for a period of time; see issue #331
//        delete(new File(home + JXTA_CACHE));
    }

    private static void initPreferences(String home) {
        File f = new File(home + PREFS);

        if (!f.exists()) {
            try {
                createFile(f, DEFAULT_PREFS);

            } catch (IOException e) {
                LOG.log(Level.SEVERE,
                        "Unable to create file " + f.getAbsolutePath(),
                        e);
            }
        }


    }

    /**
     * Returns the URI path of the Home Directory.
     */
    public static URI getHome() {
        return myjxta;
    }

    /**
     * Returns the {@link File#getCanonicalPath() Canonical} path of the Home Directory if possible; otherwise,
     * returns the {@link File#getAbsolutePath() Absolute} path.
     */
    public static String getHomeDirPath() {
        String p = null;

        if (myjxta != null) {
            try {
                p = Conversion.toFile(myjxta).getCanonicalPath();
            } catch (ConversionException ce) {
                if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                    LOG.log(Level.SEVERE, "home path", ce);
                }
            } catch (IOException ioe) {
                if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                    LOG.log(Level.SEVERE, "home path", ioe);
                }
            }
        }

        return p;
    }

    /**
     * Returns the URL of the current configuration file.
     */
    public static URL getConfiguration() {
        URL u = null;

        try {
            u = new URL(getHome() + CONFIGURATION);
        } catch (MalformedURLException mue) {
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "Caught unexpected Exception", mue);
            }
        }

        return u;
    }

    /**
     * Return the path to platform specific configuration
     * file
     *
     * @return the path to the platform specific configuration file
     */
    public static URL getPlatform() {
        URL u = null;

        try {
            u = new URL(getHome() + PLATFORM);
        } catch (MalformedURLException mue) {
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "Caught unexpected Exception", mue);
            }
        }

        return u;
    }

    /**
     * Creates or deletes a Reconfigure file (home/reconf) depending on
     * whether the reconfigure param is true or false, respectively.
     *
     * @param reconfigure If true, a new Reconfigure file is created;
     *                    otherwise, the existing Reconfigure file is deleted.
     */
    public static void setReconfigure(boolean reconfigure) {
        File r = new File(new File(myjxta), RECONFIGURE);

        if (r != null) {
            if (reconfigure) {
                try {
                    r.createNewFile();
                } catch (IOException ioe) {
                    if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                        LOG.log(Level.SEVERE, "Caught unexpected Exception", ioe);
                    }
                }
            } else {
                delete(r);
            }
        }
    }

    /**
     * @return The log4jConfigFilePath.
     */
    public static String getLog4jConfigFilePath() {
        return log4jConfigFilePath;
    }

    /**
     * @return true if the log4j config file pointed to by log4jConfigFilePath has a ".xml" extension, and false
     *         otherwise.
     */
    public static boolean isLog4jConfigFileXml() {
        return log4jConfigFileXml;
    }

    public static void delete(File f) {
        if (f.exists()) {
            if (f.isFile()) {
                f.delete();
            } else {
                File[] files = f.listFiles();

                for (int i = 0; i < files.length; i++) {
                    delete(files[i]);
                }

                f.delete();
            }
        }
    }

    private static void createFile(File newFile, String sourceFilePath) throws IOException {
        File p = newFile.getParentFile();

        if (p != null) {
            p.mkdirs();
        }

        ResourceManager rm = ResourceManager.getInstance();
        InputStream is = rm.getResourceAsStream(sourceFilePath);

        if (is != null) {
            newFile.createNewFile();

            FileOutputStream os = new FileOutputStream(newFile);
            BufferedOutputStream out = new BufferedOutputStream(os);

            int c = -1;

            while ((c = is.read()) > -1) {
                out.write(c);
            }

            out.flush();
            is.close();
            out.close();
        }
    }

    /**
     * Returns the URL of the current preferences file.
     */
    public static URL getPreferences() {
        URL url = null;

        try {
            url = new URL(getHome() + PREFS);
        } catch (MalformedURLException mue) {
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "Caught unexpected Exception", mue);
            }
        }

        return url;
    }

    public static boolean savePreferences(String prefDoc) {
        boolean ret = false;
        try {
            updateFile(getPreferences(), new ByteArrayInputStream(prefDoc.getBytes()));
        } catch (IOException iox) {
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "Caught unexpected Exception", iox);
            }
        }
        return ret;
    }

    private static void updateFile(URL currentFile, InputStream in) throws IOException {

        File f = null;
        try {
            f = new File(currentFile.toURI());
        } catch (URISyntaxException ex) {
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "Caught unexpected Exception", ex);
            }
        }

        if (!f.exists()) {
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.severe("File does not exist. Creating");
            }

            File p = f.getParentFile();

            if (p != null) {
                p.mkdirs();
            }

            f.createNewFile();
        }

        FileOutputStream os = new FileOutputStream(f);
        BufferedOutputStream out = new BufferedOutputStream(os);

        int c = -1;

        while ((c = in.read()) > -1) {
            out.write(c);
        }

        out.flush();
        in.close();
        out.close();
    }

    private static void initLog4JConfig(String home) {
        throw new UnsupportedOperationException("Not yet implemented");
    }
}