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The contents of this file are subject to the Mozilla Public License Version 1.1
(the "License"); you may not use this file except in compliance with the License.
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WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
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The Original Code is "".  Description:
"Validation rule for detecting unknown Segments in a message"

The Initial Developer of the Original Code is University Health Network. Copyright (C)
2012.  All Rights Reserved.

Contributor(s): ______________________________________.

Alternatively, the contents of this file may be used under the terms of the
GNU General Public License (the "GPL"), in which case the provisions of the GPL are
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import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import ca.uhn.hl7v2.Location;
import ca.uhn.hl7v2.model.GenericSegment;
import ca.uhn.hl7v2.model.Message;
import ca.uhn.hl7v2.model.Structure;
import ca.uhn.hl7v2.util.ReadOnlyMessageIterator;
import ca.uhn.hl7v2.validation.MessageRule;
import ca.uhn.hl7v2.validation.ValidationException;
import ca.uhn.hl7v2.validation.impl.AbstractMessageRule;

* Validation rule for detecting unknown segments in a message
* @author Christian Ohr
public class OnlyKnownSegmentsRule extends AbstractMessageRule {

  public static final MessageRule ONLY_KNOWN_SEGMENTS = new OnlyKnownSegmentsRule();
  public ValidationException[] apply(Message msg) {
    List<ValidationException> exceptions = new ArrayList<ValidationException>();

    for (Iterator<Structure> iter = ReadOnlyMessageIterator
        .createPopulatedStructureIterator(msg, GenericSegment.class); iter.hasNext();) {
      String segmentName =;
      ValidationException ve = new ValidationException("Found unknown segment: " + segmentName);
      Location location = new Location();
    return exceptions.toArray(new ValidationException[exceptions.size()]);


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