package org.andromda.core.common;
   
   import java.io.InputStream;
   import java.net.URL;
   import java.util.Properties;
   
   /**
    * This class provides statistics on how the build was performed.
    *
   * @author Martin West
   * @author Chad Brandon
   */
  public final class BuildInformation
  {
      /**
       * The shared instance.
       */
      private static final BuildInformation INSTANCE = new BuildInformation();
  
      /**
       * Gets the shared instance of the BuildInformation.
       *
       * @return the shared BuildInformation instance.
       */
      public static BuildInformation instance()
      {
          return INSTANCE;
      }
  
      /**
       * Private default constructor of BuildInformation. This class is not intended to be instantiated.
       */
      private BuildInformation()
      {
          this.initialize();
      }
  
      /**
       * The build timestamp.
       */
      private String buildDate;
  
      /**
       * The build operating system and version.
       */
      private String buildSystem;
  
      /**
       * The JDK details used to build the system.
       */
      private String buildJdk;
  
      /**
       * The name of the user that built the system.
       */
      private String buildBuilder;
  
      /**
       * The version of the AndroMDA build.
       */
      private String buildVersion;
  
      private void initialize()
      {
          final String buildPropertiesUri = "META-INF/andromda-build.properties";
          final String versionPropertyName = "andromda.build.version";
          final String datePropertyName = "andromda.build.date";
          final String systemPropertyName = "andromda.build.system";
          final String jdkPropertyName = "andromda.build.jdk";
          final String builderPropertyName = "andromda.build.builder";
          final URL versionUri = ResourceUtils.getResource(buildPropertiesUri);
          try
          {
              if (versionUri == null)
              {
                  throw new IllegalStateException(
                      "BuildInformation: could not load file --> '" + buildPropertiesUri + '\'');
              }
              final Properties properties = new Properties();
              InputStream stream = versionUri.openStream();
              properties.load(stream);
              stream.close();
  
              this.buildDate = properties.getProperty(datePropertyName);
              this.buildSystem = properties.getProperty(systemPropertyName);
              this.buildJdk = properties.getProperty(jdkPropertyName);
              this.buildBuilder = properties.getProperty(builderPropertyName);
              this.buildVersion = properties.getProperty(versionPropertyName);
          }
          catch (final Throwable throwable)
          {
              ExceptionRecorder.instance().record(throwable);
              throw new IllegalStateException(throwable.getMessage());
          }
      }
  
      /**
       * Return the name of the operating system and version.
       *
      * @return Returns the build version.
      */
     public String getBuildVersion()
     {
         return this.buildVersion;
     }
 
     /**
      * Return the user name of the id which built the system.
      *
      * @return Returns the build builder.
      */
     public String getBuildBuilder()
     {
         return this.buildBuilder;
     }
 
     /**
      * Return the timestamp of the build.
      *
      * @return Returns the build date.
      */
     public String getBuildDate()
     {
         return this.buildDate;
     }
 
     /**
      * Return the vendor and jdk version.
      *
      * @return Returns the build jdk.
      */
     public String getBuildJdk()
     {
         return this.buildJdk;
     }
 
     /**
      * Return the name of the operating system and version.
      *
      * @return Returns the build system.
      */
     public String getBuildSystem()
     {
         return this.buildSystem;
     }
 }