001/*
002 * Created on 19-Apr-2004
003 */
004package ca.uhn.hl7v2.protocol.impl;
005
006import java.util.HashMap;
007import java.util.List;
008import java.util.Map;
009
010import ca.uhn.hl7v2.HL7Exception;
011import ca.uhn.hl7v2.model.Message;
012import 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 */
021public 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}