/*

  * Created on 19-Apr-2004

  */

 package ca.uhn.hl7v2.protocol.impl;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 import ca.uhn.hl7v2.HL7Exception;

 import ca.uhn.hl7v2.model.Message;

 import ca.uhn.hl7v2.util.Terser;

 /**

  * A utility for getting a list of fields from a <code>Message</code>, 

  * e.g. for inclusion in a <code>Transportable</code>. 

  *  

  * @author <a href="mailto:bryan.tripp@uhn.on.ca">Bryan Tripp</a>

  * @version $Revision: 1.1 $ updated on $Date: 2007-02-19 02:24:26 $ by $Author: jamesagnew $

  */

 public class MetadataExtractor {

     /**

      * @param theMessage a message from which to extract fields

      * @param theTerserPaths a list of paths to desired fields, in the 

      *      form required by <code>Terser</code>.  

      * @return a Map from Terser paths to field values 

      */

     public static Map<String, String> getFields(Message theMessage, List<String> theTerserPaths) throws HL7Exception {

         Map<String, String> fields = new HashMap<String, String>();

         Terser terser = new Terser(theMessage);

         for (int i = 0; i < theTerserPaths.size(); i++) {

             String path = theTerserPaths.get(i);

             String fieldValue = terser.get(path);

             fields.put(path, fieldValue);

         }

         return fields;

     }

 }