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   package ca.uhn.hl7v2.examples;
   
   import ca.uhn.hl7v2.DefaultHapiContext;
   import ca.uhn.hl7v2.HL7Exception;
  import ca.uhn.hl7v2.HapiContext;
  import ca.uhn.hl7v2.examples.custommodel.v25.message.ZDT_A01;
  import ca.uhn.hl7v2.examples.custommodel.v25.segment.ZPI;
  import ca.uhn.hl7v2.model.Segment;
  import ca.uhn.hl7v2.model.v25.message.ADT_A01;
  import ca.uhn.hl7v2.parser.CustomModelClassFactory;
  import ca.uhn.hl7v2.parser.ModelClassFactory;
  import ca.uhn.hl7v2.parser.Parser;
  
  
  /**
   * Example using custom model classes
   */
  public class CustomModelClasses {
  
      public static void main(String[] args) throws HL7Exception {
  
          // Suppose we need to parse a message that has some local customization
          // or quirk. The most common example is Z-segments in messages, but we
          // could even be talking about completely non conformant structures.
  
          // For this example, let's imagine an application that has a custom
          // patient segment called ZPI after the PID segment in an ADT^A01 message.
          // This ZPI segment has two fields:
          //   1 - a repeating ST called "Pet Name"
          //   2 - a non repeating NM called "shoe size"
  
          // Here's an example message
  		String messageText = "MSH|^~\\&|IRIS|SANTER|AMB_R|SANTER|200803051508||ADT^A01|263206|P|2.5\r"
  				+ "EVN||200803051509||||200803031508\r"
  				+ "PID|||5520255^^^PK^PK~ZZZZZZ83M64Z148R^^^CF^CF~ZZZZZZ83M64Z148R^^^SSN^SSN^^20070103^99991231~^^^^TEAM||ZZZ^ZZZ||19830824|F||||||||||||||||||||||N\r"
  				+ "ZPI|Fido~Fred|13\r"
  				+ "PV1||I|6402DH^^^^^^^^MED. 1 - ONCOLOGIA^^OSPEDALE MAGGIORE DI LODI&LODI|||^^^^^^^^^^OSPEDALE MAGGIORE DI LODI&LODI|13936^TEST^TEST||||||||||5068^TEST2^TEST2||2008003369||||||||||||||||||||||||||200803031508\r"
  				+ "PR1|1||1111^Mastoplastica|Protesi|20090224|02|";
  
          // HAPI will still parse this message fine
  		HapiContext context = new DefaultHapiContext();
  		Parser parser = context.getPipeParser();
          ADT_A01/../../../ca/uhn/hl7v2/model/v25/message/ADT_A01.html#ADT_A01">ADT_A01 message = (ADT_A01) parser.parse(messageText);
          
          // If we want to access the data in the ZPI segment, it's pretty easy
          Segmentca/uhn/hl7v2/model/Segment.html#Segment">Segment zpiGenericSegment = (Segment) message.get("ZPI");
  
          String firstPetName  = zpiGenericSegment.getField(1, 0).encode();
          String secondPetName = zpiGenericSegment.getField(1, 1).encode();
          System.out.println(firstPetName); // Fido
          System.out.println(secondPetName); // Fred
  
          String shoeSize = zpiGenericSegment.getField(2, 0).encode();
          System.out.println(shoeSize); // 13
  
  
          // Now, suppose our message is actually called ZDT^A01, and we plan on
          // using it frequently, so we want to explicitly define a class to
          // handle it. That can be done as well.
  
          // Here is a segment class we have created (click to view):
          ZPI zpi;
  
          // Here is a message class we have created (click to view):
          ZDT_A01 zdtA01;
  
          // These classes are both in the package ca.uhn.hl7v2.examples.custommodel.[version].[type]
          // We associated the HapiContext with a custom model class factory to use it
          ModelClassFactory cmf = new CustomModelClassFactory("ca.uhn.hl7v2.examples.custommodel");
          context.setModelClassFactory(cmf);
  
          // The resulting message will be an instance of our custom type (this time, MSH-9 says ZDT^A01)
  		messageText = "MSH|^~\\&|IRIS|SANTER|AMB_R|SANTER|200803051508||ZDT^A01|263206|P|2.5\r"
  				+ "EVN||200803051509||||200803031508\r"
  				+ "PID|||5520255^^^PK^PK~ZZZZZZ83M64Z148R^^^CF^CF~ZZZZZZ83M64Z148R^^^SSN^SSN^^20070103^99991231~^^^^TEAM||ZZZ^ZZZ||19830824|F||||||||||||||||||||||N\r"
  				+ "ZPI|Fido~Fred|13\r"
  				+ "PV1||I|6402DH^^^^^^^^MED. 1 - ONCOLOGIA^^OSPEDALE MAGGIORE DI LODI&LODI|||^^^^^^^^^^OSPEDALE MAGGIORE DI LODI&LODI|13936^TEST^TEST||||||||||5068^TEST2^TEST2||2008003369||||||||||||||||||||||||||200803031508\r"
  				+ "PR1|1||1111^Mastoplastica|Protesi|20090224|02|";
          zdtA01 = (ZDT_A01) parser.parse(messageText);
  
          // Now we have easy access to our new segment and fields
          zpi = zdtA01.getZPI();
  
          System.out.println(zpi.getPetName()[0].encode()); // Fido
          System.out.println(zpi.getPetName()[1].encode()); // Fred
          System.out.println(zpi.getShoeSize().encode()); // 13
  
      }
  
  }