source: main/trunk/greenstone3/src/java/org/greenstone/util/GlobalProperties.java@ 32335

/*
 *    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.util;

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

import org.apache.log4j.Logger;

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

    static Logger logger = Logger.getLogger(org.greenstone.util.GlobalProperties.class.getName());
    private static Properties properties = new Properties();
    private static String properties_filename = "global.properties";
    private static String gsdl3_home = null;
    private static String gsdl3_writablehome = null;
    private static String gsdl3_web_address = null;
    private static String full_gsdl3_web_address = null;

    /** 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 getGSDL3WritableHome()
    {
        return gsdl3_writablehome;
    }

    public static String getGS2Build()
    {
        return gsdl3_home + File.separator + ".." + File.separator + "gs2build";
    }

    public static String getGSDL3WebAddress()
    {
        return gsdl3_web_address;
    }

    public static String getFullGSDL3WebAddress()
    {
        return full_gsdl3_web_address;
    }

    public static void loadGlobalProperties(String optionalGS3Home)
    {
        try
        {
            InputStream in = Class.forName("org.greenstone.util.GlobalProperties").getClassLoader().getResourceAsStream(properties_filename);

            if (in==null)
            {
                    // Try to find it through gsdl3.writablehome
                    logger.info("Couldn't find '" + properties_filename + "' through ClassLoader");
                    logger.info("Trying alternative path through System property gsdl3.writablehome");
                gsdl3_writablehome = System.getProperty("gsdl3.writablehome");
                if (gsdl3_writablehome!=null) {

                    String gp_full_filename = gsdl3_writablehome + File.separator + "WEB-INF"
                    + File.separator + "classes" 
                    + File.separator + properties_filename; 

                    try {
                    in = new FileInputStream(gp_full_filename);
                    logger.info("Found '" + properties_filename + "'");
                    }
                    catch (Exception e) {
                    logger.info("Unable to locate '" + gp_full_filename + "'");
                    }
                }
                else {
                    logger.info("Java property gsdl3.writablehome was not set");
                }
            }

            if (in != null)
            {
                logger.debug("Loading global properties");
                properties.load(in);
                in.close();
            }
            else {
                    logger.error("Failed to find '" + properties_filename + "'");
            }    

            gsdl3_home = properties.getProperty("gsdl3.home");
            if ((gsdl3_home == null || gsdl3_home.length() == 0) 
                && optionalGS3Home != null && optionalGS3Home.length() > 0)
            {
                gsdl3_home = optionalGS3Home;
            }

            // if gsdl3_home is still null, fall back to default: gsdl3srchome/web
            if (gsdl3_home == null) { 
                gsdl3_home = System.getenv("GSDL3SRCHOME") + File.separator + "web";
                logger.warn("** Note: falling back to using GSDL3SRCHOME to set gsdl3.home to: " + gsdl3_home);
            }

            // make sure the path separators are correct
            // gsdl3_home may be null, e.g., when we are loading properties from Server3
            if (gsdl3_home != null)
            {
                File gs3_file = new File(gsdl3_home);
                gsdl3_home = gs3_file.getPath();
            }

            gsdl3_writablehome = properties.getProperty("gsdl3.writablehome");
            // if gsdl3_writablehome is null, then defaults to gsdl3_home
            if (gsdl3_writablehome == null) { 
                gsdl3_writablehome = gsdl3_home;
            }

            //build the gsdl3 web address, in a way resilient to errors and ommisions in global.properties, simplifying where possible
            //aiming for a string with no trailing slash, eg "http://localhost:8080/greenstone3" or "http://www.mygreenstonelibrary.com"
            String protocolSpecifier = null, hostSpecifier = null, portSpecifier = null, contextSpecifier = null;

            //protocol
            protocolSpecifier = properties.getProperty("server.protocol");
            if (protocolSpecifier == null || protocolSpecifier.equals(""))
            {
                protocolSpecifier = "http://";
            }
            else if (!protocolSpecifier.endsWith("://"))
            {               
                protocolSpecifier = protocolSpecifier + "://";              
            }

            //hostname
            hostSpecifier = properties.getProperty("tomcat.server");
            if (hostSpecifier == null)
            {
                hostSpecifier = "localhost";
            }
            else
            {               
                while (hostSpecifier.endsWith("/"))
                {
                    hostSpecifier = hostSpecifier.substring(0, hostSpecifier.length() - 1);
                }
            }

            //port
            portSpecifier = properties.getProperty("tomcat.port");
            if (portSpecifier == null || portSpecifier.equals("") 
                || (protocolSpecifier.equals("http://") && portSpecifier.equals("80"))
                || (protocolSpecifier.equals("https://") && portSpecifier.equals("443")))
            {
                portSpecifier = "";
            }
            else
            {
                portSpecifier = ":" + portSpecifier;
            }

            //context path
            contextSpecifier = properties.getProperty("tomcat.context");
            if (contextPath == null || contextPath.equals("") || contextPath.equals("/"))
            {
                contextSpecifier = "";
            }
            else
            {               
                if (!contextSpecifier.startsWith("/"))
                {
                    contextSpecifier = "/" + contextSpecifier;
                }
            }

            //string it all together
            full_gsdl3_web_address = protocolSpecifier + hostSpecifier + portSpecifier + contextSpecifier;
            gsdl3_web_address = contextSpecifier;
        }
        catch (Exception e)
        {
            logger.error("Exception trying to reload global.properties: " + e);
            e.printStackTrace();
        }
    }
}