source: greenstone3/trunk/src/java/org/greenstone/gsdl3/util/GlobalProperties.java@ 16869

/*
 *    GlobalProperties.java
 *    Copyright (C) 2008 New Zealand Digital Library, http://www.nzdl.org
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.greenstone.gsdl3.util;

import java.util.Properties;
import java.io.File;
import java.io.InputStream;

import org.apache.log4j.*;

/** holds some global properties for the application. Read from a properties file */
public class GlobalProperties {


     static Logger logger = Logger.getLogger(org.greenstone.gsdl3.util.GlobalProperties.class.getName());
    private static Properties properties = null;
    private static String properties_filename = "global.properties";
    private static String gsdl3_home = null;
    private static String gsdl3_web_address = null;
    
    // Note, that if the servlet is reloadable, then it is reloaded each time the file is changed.
    static {
    //load in the properties
    properties = new Properties();
    reload();   
    }
    
    /** get the value of the property 'key'. returns null if not found */
    public static String getProperty(String key) {
    return properties.getProperty(key);
    }

    /** get the value of the property 'key'. 
     * returns default_value if not found */
    public static String getProperty(String key, String default_value) {
    return properties.getProperty(key, default_value);
    }

    /** some special ones */
    public static String getGSDL3Home() {
    return gsdl3_home;
    }

    public static String getGSDL3WebAddress() {
    return gsdl3_web_address;
    }
    
    public static void reload() {
    try {
        InputStream in = Class.forName("org.greenstone.gsdl3.util.GlobalProperties").getClassLoader().getResourceAsStream(properties_filename);
        if (in != null) {
        logger.error("loading global properties");
        properties.load(in);
        in.close();
        } else {
        logger.error("couldn't load global properties!");
        }
        gsdl3_home = properties.getProperty("gsdl3.home");
        // make sure the path separators are correct
        File gs3_file = new File(gsdl3_home);
        gsdl3_home = gs3_file.getPath();
        gsdl3_web_address = "http://"+ properties.getProperty("tomcat.server")+":"+ properties.getProperty("tomcat.port")+"/"+properties.getProperty("tomcat.context");
    } catch (Exception e) {
        logger.error("Exception trying to reload global.properties: "+e);
    }
    
    }
}