/// <summary>
/// Returns a specific field based on selection Criteria
/// NOTE: Selection Criteria can be a string such as "MSH.1.16[2]" or an array of Selection Criteria Elements
/// </summary>
/// <param name="criteria"></param>
/// <returns></returns>
public HL7Element Element(SearchCriteria criteria)
{
// Locate required Segment
if (criteria == null || criteria.Segment == null)
{
return(null);
}
var segmentElements = AllSegments(criteria.Segment);
var targetRow = (criteria.SegmentRepetition > 0) ? criteria.SegmentRepetition - 1 : 0;
if (targetRow > segmentElements.Count - 1)
{
return(new HL7Element()); // not found;
}
if (!criteria.Field.Enabled)
{
return(segmentElements[targetRow]); //wants only the full segment
}
// locate the required field, components or subcomponent
var makeHeaderAdjustment = (Constants.HeaderTypes.Any(h => h.Equals(criteria.Segment)));
SearchCriteriaElement[] newCriteria = new SearchCriteriaElement[3];
for (int i = 1; i < 4; i++)
{
// Make Adjustment for MSH
newCriteria[i - 1] = (i == 1 && criteria.elements[i].Enabled && makeHeaderAdjustment) ?
new SearchCriteriaElement(criteria.elements[i].Position - 1,
criteria.elements[i].Repetition,
criteria.elements[i].Value,
true)
:
criteria.elements[i];
}
return(segmentElements[targetRow].Element(newCriteria));
}
private static SearchCriteria Parse(string criteria)
{
SearchCriteria result = new SearchCriteria();
if (criteria.Length == 0)
{
return(result);
}
var searchCriteriaElements = SearchCriteriaElement.Parse(criteria);
for (int i = 0; i < 4; i++)
{
if (searchCriteriaElements.Length > i)
{
result.elements[i] = searchCriteriaElements[i];
}
else
{
result.elements[i].Enabled = false;
}
}
if (result.Segment.Length == 0 && !result.elements[0].Skip)
{
throw new ArgumentException("Segment type or wildcard expected");
}
return(result);
}
public SearchCriteria(string criteria)
{
var newcriteria = Parse(criteria);
/*this.elements = newcriteria.elements;*/
this.Segment = newcriteria.Segment;
this.SegmentRepetition = newcriteria.SegmentRepetition;
this.Field = newcriteria.Field;
this.Component = newcriteria.Component;
this.Subcomponent = newcriteria.Subcomponent;
this.elements[0].Skip = newcriteria.elements[0].Skip;
}
public static SearchCriteriaElement[] Parse(string criteria)
{
if (criteria.Length == 0)
{
return(new SearchCriteriaElement[0]);
}
var separator = '.';
if (criteria.IndexOf("/") > 0)
{
separator = '/';
}
string[] searchFields = criteria.Split(separator);
var result = new SearchCriteriaElement[searchFields.Length];
for (int i = 0; i < searchFields.Length; i++)
{
result[i] = SearchCriteriaElement.ParseElement(searchFields[i]);
}
return(result);
}