package ca.uhn.hl7v2.util;

 import java.io.File;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 /**

  * Used to access the hapi.home system property.  Note that the property 

  * is only checked (at most) once per session.  

  * @author Bryan Tripp

  */

 public class Home {

     private static File home;

     private static Logger log = LoggerFactory.getLogger(Home.class);

     /** Creates a new instance of Home */

     public Home() {

     }

     /**

      * Returns a File object corresponding to the directory specified in 

      * the system property hapi.home.  The property is only checked the 

      * first time this method is called, so changes will not take place 

      * until a new VM is started.  

      * This method is guaranteed to return a directory.  If hapi.home is 

      * not set, or is set to a non-directory path, the current working directory will 

      * be used.  

      */

     public static File getHomeDirectory() {

         if (home == null) 

             setHomeDirectory();

         return home;

     }

     private synchronized static void setHomeDirectory() {

         String dir = System.getProperty("hapi.home", ".");

         home = new File(dir);

         if (!home.isDirectory()) {

             home = new File("."); 

             log.warn("The system property hapi.home is not a valid directory: {}.  Using . instead", dir);

         }

         log.info("hapi.home is set to " + home.getAbsolutePath());

     }

     public static void main(String args[]) {

         System.out.println("HOME: " + getHomeDirectory().getAbsolutePath());

     }

 }