package ca.uhn.hl7v2.examples;
   
   import java.io.BufferedInputStream;
   import java.io.File;
   import java.io.FileInputStream;
   import java.io.FileNotFoundException;
   import java.io.InputStream;
   
   import ca.uhn.hl7v2.model.Message;
  import ca.uhn.hl7v2.util.Hl7InputStreamMessageIterator;
  import ca.uhn.hl7v2.util.Hl7InputStreamMessageStringIterator;
  
  public class ReadMessagesFromFile {
  
  	@SuppressWarnings("unused")
  	public static void main(String[] args) throws FileNotFoundException {
  
  		/*
  		 * This example shows how to read a series of messages from a file
  		 * containing a number of HL7 messages. Assume you have a text file
  		 * containing a number of messages.
  		 */
  		
  		// Open an InputStream to read from the file
  		File file = new File("hl7_messages.txt");
  		InputStream is = new FileInputStream(file);
  		
  		// It's generally a good idea to buffer file IO
  		is = new BufferedInputStream(is);
  		
  		// The following class is a HAPI utility that will iterate over
  		// the messages which appear over an InputStream
  		Hl7InputStreamMessageIterator iter = new Hl7InputStreamMessageIterator(is);
  		
  		while (iter.hasNext()) {
  			
  			Message next = iter.next();
  			
  			// Do something with the message
  			
  		}
  		
  		/*
  		 * If you don't want the message parsed, you can also just
  		 * read them in as strings.
  		 */
  		
  		file = new File("hl7_messages.txt");
  		is = new FileInputStream(file);
  		is = new BufferedInputStream(is);
  		Hl7InputStreamMessageStringIterator iter2 = new Hl7InputStreamMessageStringIterator(is); 
  		
  		while (iter2.hasNext()) {
  			
  			String next = iter2.next();
  			
  			// Do something with the message
  			
  		}
  		
  	}
  
  }