private List<ElementMatch<Element>> FindCorrespondingElements(IEnumerable<Element> elementsA, Element[] elementsB)
{
var elementMatches = new List<ElementMatch<Element>>();
foreach (var element in elementsA)
{
Tuple<ElementMatch<Element>, decimal>[] matches;
if (HasSimilarElements(element, elementsB, out matches))
{
var elementMatch = new ElementMatch<Element>
{
This = element,
Matches = new Queue<Tuple<ElementMatch<Element>, decimal>>(matches)
};
elementMatch.SetToNext();
elementMatches.Add(elementMatch);
}
}
return elementMatches;
}
/// <summary>
/// Attempts to determine which element on page A corresponds to which element on page B.
/// </summary>
/// <returns>A collection of mappings.</returns>
private void CorrespondingElements(Scrape pageA, Scrape pageB, decimal maxDistance)
{
var elementMatches = new List<ElementMatch<ScrapedElement>>();
foreach (var element in pageA.Elements)
{
ScrapedElement match;
Tuple<ElementMatch<ScrapedElement>, decimal>[] matches;
if (_elementMapper.HasExactMatch(element, pageB.Elements, out match) || _elementMapper.HasIdMatch(element, pageB.Elements, out match))
{
element.CorrespondingScrapedElement = match;
match.CorrespondingScrapedElement = element;
}
else if (_elementMapper.HasSimilarElements(element, pageB.Elements, maxDistance, out matches))
{
var elementMatch = new ElementMatch<ScrapedElement>
{
This = element,
Matches = new Queue<Tuple<ElementMatch<ScrapedElement>, decimal>>(matches)
};
elementMatch.SetToNext();
elementMatches.Add(elementMatch);
}
}
// Resolve conflicts
_conflictResolver.ResolveAllConflicts(elementMatches.ToArray());
foreach (var element in elementMatches.Where(m => m.Match != null))
{
element.This.CorrespondingScrapedElement = element.Match.This;
element.Match.This.CorrespondingScrapedElement = element.This;
}
}
