package ca.uhn.hl7v2.model;
   
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import ca.uhn.hl7v2.HL7Exception;
   import ca.uhn.hl7v2.Version;
   import ca.uhn.hl7v2.parser.ModelClassFactory;
   
  /**
   * A generic HL7 message, meant for parsing message with unrecognized structures
   * into a flat list of segments.
   * 
   * @author Bryan Tripp
   * @author Christian Ohr
   */
  @SuppressWarnings("serial")
  public abstract class GenericMessage extends AbstractMessage {
      
  	private static final Logger log = LoggerFactory.getLogger(GenericMessage.class);
  	
      /** 
       * Creates a new instance of GenericMessage. 
       * 
       * @param factory class factory for contained structures 
       */
      public GenericMessage(ModelClassFactory factory) {
          super(factory);
          try {
              this.addNonstandardSegment("MSH");
          } catch(HL7Exception e) {
              String message = "Unexpected error adding GenericSegment to GenericMessage.";
              log.error(message, e);
              throw new Error(message); // TODO better throw RuntimeException
          }        
      }
      
      /**
       * Returns a subclass of GenericMessage corresponding to a certain version.  
       * This is needed so that version-specific segments can be added as the message
       * is parsed.
       *
       * @param version the HL7 version
       * @return the class of the generic message
       */
  	@SuppressWarnings("unchecked")
  	public static Class<? extends Message> getGenericMessageClass(String version) {
  		
  		Version v = Version.versionOf(version);
          if (v != null) {       
          	try {
          		String className = GenericMessage.class.getName() + "$" + v.name();
          		return (Class<? extends Message>)Class.forName(className);
          	} catch (ClassNotFoundException e) {
          		// should not happen as long Version corresponds with the static
          		// subclasses of GenericMessage
          	}
          }
  
          log.debug("Unknown version for generic type {}", version);
          return UnknownVersion.class;
      }
  
  
      public static class UnknownVersion extends GenericMessage {
  		private static final long serialVersionUID = 4773366840392833956L;
  		public UnknownVersion(ModelClassFactory factory) {
              super(factory);
          }
          public String getVersion() {
          	return Version.latestVersion().getVersion();
          }
  
      }
  
      public static class V21 extends GenericMessage {
  		private static final long serialVersionUID = 4773366840392833956L;
  		public V21(ModelClassFactory factory) {
              super(factory);
          }
          public String getVersion() { return Version.V21.getVersion(); }
      }
      
      public static class V22 extends GenericMessage {
  		private static final long serialVersionUID = 7124224621400437244L;
  		public V22(ModelClassFactory factory) {
              super(factory);
          }
          public String getVersion() { return Version.V22.getVersion(); }
      }
      
      public static class V23 extends GenericMessage {
  		private static final long serialVersionUID = -8794048442253389190L;
  		public V23(ModelClassFactory factory) {
              super(factory);
          }
          public String getVersion() { return Version.V23.getVersion(); }
      }
      
     public static class V231 extends GenericMessage {
 		private static final long serialVersionUID = 5979370667795858995L;
 		public V231(ModelClassFactory factory) {
             super(factory);
         }
         public String getVersion() { return Version.V231.getVersion(); }
     }
     
     public static class V24 extends GenericMessage {
 		private static final long serialVersionUID = -4944772617600551061L;
 		public V24(ModelClassFactory factory) {
             super(factory);
         }
         public String getVersion() { return Version.V24.getVersion(); }
     }
     
     public static class V25 extends GenericMessage {
 		private static final long serialVersionUID = 3937051332672967947L;
 		public V25(ModelClassFactory factory) {
             super(factory);
         }
         public String getVersion() { return Version.V25.getVersion(); }
     }
     
     public static class V251 extends GenericMessage {
 		private static final long serialVersionUID = -767282165482145544L;
 		public V251(ModelClassFactory factory) {
             super(factory);
         }
         public String getVersion() { return Version.V251.getVersion(); }
     }
 
     public static class V26 extends GenericMessage {
 		private static final long serialVersionUID = -1693277295151324396L;
 		public V26(ModelClassFactory factory) {
             super(factory);
         }
         public String getVersion() { return Version.V26.getVersion(); }
     }
 
     public static class V27 extends GenericMessage {
 		private static final long serialVersionUID = -1693277295151324396L;
 		public V27(ModelClassFactory factory) {
             super(factory);
         }
         public String getVersion() { return Version.V27.getVersion(); }
     }
 
     public static class V271 extends GenericMessage {
 		private static final long serialVersionUID = -1693277295151324396L;
 		public V271(ModelClassFactory factory) {
             super(factory);
         }
         public String getVersion() { return Version.V271.getVersion(); }
     }
 
     public static class V28 extends GenericMessage {
 		private static final long serialVersionUID = -1693277295151324396L;
 		public V28(ModelClassFactory factory) {
             super(factory);
         }
         public String getVersion() { return Version.V28.getVersion(); }
     }
 
     public static class V281 extends GenericMessage {
 		private static final long serialVersionUID = -1693277295151324396L;
 		public V281(ModelClassFactory factory) {
             super(factory);
         }
         public String getVersion() { return Version.V281.getVersion(); }
     }
 
 }