001    /*
002     * Created on 19-Apr-2004
003     */
004    package ca.uhn.hl7v2.protocol.impl;
005    
006    import java.util.HashMap;
007    import java.util.List;
008    import java.util.Map;
009    
010    import ca.uhn.hl7v2.HL7Exception;
011    import ca.uhn.hl7v2.model.Message;
012    import ca.uhn.hl7v2.util.Terser;
013    
014    /**
015     * A utility for getting a list of fields from a <code>Message</code>, 
016     * e.g. for inclusion in a <code>Transportable</code>. 
017     *  
018     * @author <a href="mailto:bryan.tripp@uhn.on.ca">Bryan Tripp</a>
019     * @version $Revision: 1.1 $ updated on $Date: 2007-02-19 02:24:26 $ by $Author: jamesagnew $
020     */
021    public class MetadataExtractor {
022    
023        /**
024         * @param theMessage a message from which to extract fields
025         * @param theTerserPaths a list of paths to desired fields, in the 
026         *      form required by <code>Terser</code>.  
027         * @return a Map from Terser paths to field values 
028         */
029        public static Map<String, String> getFields(Message theMessage, List<String> theTerserPaths) throws HL7Exception {
030            Map<String, String> fields = new HashMap<String, String>();
031            Terser terser = new Terser(theMessage);
032            for (int i = 0; i < theTerserPaths.size(); i++) {
033                String path = theTerserPaths.get(i);
034                String fieldValue = terser.get(path);
035                fields.put(path, fieldValue);
036            }
037            return fields;
038        }
039    
040    }