/// <summary>
/// Creates a rank order from a list of categories with difficulty ratings.
/// </summary>
///
/// <param name="categories">List of categories.</param>
///
/// <returns>RankOrder object</returns>
public RankOrder createRankOrder(List <PCategory> categories)
{
if (categories.Find(category => !category.hasId()) != null)
{
Log(Severity.Error, "createRankOrder: Cannot create a rank order. Category ID is missing. Returning null.");
return(null);
}
// [SC] sorting by an ascending order of ID
categories.Sort((catOne, catTwo) => catOne.Id.CompareTo(catTwo.Id));
PCategory prevCat = null;
foreach (PCategory category in categories)
{
if (!category.hasRating())
{
Log(Severity.Error, String.Format("createRankOrder: Cannot create a rank order. Rating for category '{0}' is missing. Returning null.", category.Id));
return(null);
}
if (prevCat != null && prevCat.isSameId(category))
{
Log(Severity.Error, String.Format("createRankOrder: Cannot create a rank order. Duplicate category ID is found: '{0}'. Returning null.", category.Id));
return(null);
}
prevCat = category;
}
// [SC] sorting by an ascending order of ratings
categories.Sort((catOne, catTwo) => catOne.Rating.CompareTo(catTwo.Rating));
// [SC] building ranks
RankOrder rankOrder = new RankOrder(this.Threshold);
int rankIndex = 0;
Rank rank = null;
PCategory firstCat = null;
while (categories.Count > 0)
{
PCategory nextCat = categories[0];
if (firstCat == null || this.isSignificantlyDifferent(firstCat.Rating, nextCat.Rating))
{
rank = new Rank(++rankIndex);
rankOrder.addRank(rank);
firstCat = nextCat;
}
rank.addCategory(nextCat);
categories.Remove(nextCat);
}
return(rankOrder);
}
/// <summary>
/// Deserializes XML into KStructure object
/// </summary>
///
/// <param name="doc">XDocument instance</param>
///
/// <returns>KStructure object</returns>
public KStructure createKStructure(XDocument doc)
{
// [TODO] validate against schema
XName[] nodeNames;
// [SC] a hash table of all categories
Dictionary <string, PCategory> categories = new Dictionary <string, PCategory>();
// [SC] a hash table of all states
Dictionary <string, KState> states = new Dictionary <string, KState>();
// [SC] iterate through 'TwoA/PCategories/PCategory' elements
nodeNames = new XName[] { XMLFactory.PCATS_ELEM, XMLFactory.PCAT_ELEM };
foreach (XElement categoryElem in SelectNodes(doc.Root, nodeNames))
{
// [SC] get the value of 'TwoA/PCategories/PCategory@xsd:id' attribute
string id = categoryElem.Attribute(XMLFactory.ID_ATTR).Value;
// [SC] get the value of 'TwoA/PCategories/PCategory/Rating' element
double rating;
if (!Double.TryParse(categoryElem.Element(XMLFactory.RATING_ELEM).Value, out rating))
{
Log(Severity.Error, String.Format("createKStructure: unable to parse rating for category {0}. Returning null.", id));
return(null); // [TODO] no need due to schema check?
}
PCategory category = new PCategory(id, rating);
categories.Add(id, category);
}
RankOrder rankOrder = new RankOrder();
// [SC] parse the value of 'TwoA/RankOrder/Params/Threshold' element
nodeNames = new XName[] { XMLFactory.RANKORDER_ELEM, XMLFactory.PARAMS_ELEM, XMLFactory.THRESHOLD_ELEM };
double threshold;
if (Double.TryParse(SelectSingleNode(doc.Root, nodeNames).Value, out threshold))
{
rankOrder.Threshold = threshold;
}
else
{
Log(Severity.Error, "createKStructure: unable to parse the threshold value. Returning null value. Returning null.");
return(null); // [TODO] no need due to schema check?
}
// [SC] iterate through 'TwoA/RankOrder/Ranks/Rank' elements
nodeNames = new XName[] { XMLFactory.RANKORDER_ELEM, XMLFactory.RANKS_ELEM, XMLFactory.RANK_ELEM };
foreach (XElement rankElem in SelectNodes(doc.Root, nodeNames))
{
Rank rank = new Rank();
// [SC] parse the value of 'TwoA/RankOrder/Ranks/Rank@Index' atttribute
int rankIndex;
if (Int32.TryParse(rankElem.Attribute(XMLFactory.INDEX_ATTR).Value, out rankIndex))
{
rank.RankIndex = rankIndex;
}
else
{
Log(Severity.Error, "createKStructure: unable to parse the index of a rank in the rank order. Returning null.");
return(null); // [TODO] no need due to schema check?
}
// [SC] iterate through 'TwoA/RankOrder/Ranks/Rank/PCategory' elements
foreach (XElement categoryElem in rankElem.Elements(XMLFactory.PCAT_ELEM))
{
// [SC] parse 'TwoA/RankOrder/Ranks/Rank/PCategory@xsd:idref' attribute
if (categoryElem.Attribute(XMLFactory.IDREF_ATTR) == null)
{
Log(Severity.Error, String.Format("createKStructure: unable to parse ID for a category in rank {0} of the rank order. Returning null.", rankIndex));
return(null); // [TODO] no need due to schema check?
}
string id = categoryElem.Attribute(XMLFactory.IDREF_ATTR).Value;
// [SC] retrieve PCategory object by its id and add it to the rank object
PCategory category = categories[id];
if (category == null)
{
Log(Severity.Error
, String.Format("createKStructure: category {0} from rank {1} of rank order is not found in the list of categories. Returning null."
, id, rankIndex));
return(null); // [TODO] no need due to schema check?
}
rank.addCategory(category);
}
rankOrder.addRank(rank);
}
KStructure kStructure = new KStructure(rankOrder);
// [SC] iterate through 'TwoA/KStructure/KSRank' elements
nodeNames = new XName[] { XMLFactory.KSTRUCTURE_ELEM, XMLFactory.KSRANK_ELEM };
foreach (XElement ksrankElem in SelectNodes(doc.Root, nodeNames))
{
KSRank ksrank = new KSRank();
// [SC] parse the value of 'TwoA/KStructure/KSRank@Index' attribute
int rankIndex;
if (Int32.TryParse(ksrankElem.Attribute(XMLFactory.INDEX_ATTR).Value, out rankIndex))
{
ksrank.RankIndex = rankIndex;
}
else
{
Log(Severity.Error, "createKStructure: unable to parse index of a rank in the knowledge structure. Returning null.");
return(null); // [TODO] no need due to schema check?
}
if (rankIndex == 0)
{
XElement rootStateElem = ksrankElem.Element(XMLFactory.KSTATE_ELEM);
// [SC] parse 'TwoA/KStructure/KSRank/KState@xsd:id' attribute
if (rootStateElem.Attribute(XMLFactory.ID_ATTR) == null)
{
Log(Severity.Error, "createKStructure: unable to parse ID of the root state in the knowledge structure. Returning null.");
return(null); // [TODO] no need due to schema check?
}
ksrank.getStateAt(0).Id = rootStateElem.Attribute(XMLFactory.ID_ATTR).Value;
states.Add(ksrank.getStateAt(0).Id, ksrank.getStateAt(0));
kStructure.addRank(ksrank);
continue;
}
// [SC] iterate through 'TwoA/KStructure/KSRank/KState' elements
foreach (XElement stateElem in ksrankElem.Elements(XMLFactory.KSTATE_ELEM))
{
KState kstate = new KState();
// [SC] parse 'TwoA/KStructure/KSRank/KState@xsd:id' attribute
if (stateElem.Attribute(XMLFactory.ID_ATTR) == null)
{
Log(Severity.Error, String.Format("createKStructure: unable to parse ID of a state in the rank {0} of the knowledge structure. Returning null.", rankIndex));
return(null); // [TODO] no need due to schema check?
}
kstate.Id = stateElem.Attribute(XMLFactory.ID_ATTR).Value;
// [SC] parse 'TwoA/KStructure/KSRank/KState@Type' attribute
if (stateElem.Attribute(XMLFactory.TYPE_ATTR) == null)
{
Log(Severity.Error, String.Format("createKStructure: unable to parse state type in the rank {0} of the knowledge structure. Returning null.", rankIndex));
return(null); // [TODO] no need due to schema check?
}
kstate.StateType = stateElem.Attribute(XMLFactory.TYPE_ATTR).Value;
// [SC] iterate through 'TwoA/KStructure/KSRank/KState/PCategories/PCategory' elements
nodeNames = new XName[] { XMLFactory.PCATS_ELEM, XMLFactory.PCAT_ELEM };
foreach (XElement categoryElem in SelectNodes(stateElem, nodeNames))
{
// [SC] parse 'TwoA/KStructure/KSRank/KState/PCategories/PCategory@xsd:idref' attribute
if (categoryElem.Attribute(XMLFactory.IDREF_ATTR) == null)
{
Log(Severity.Error, String.Format("createKStructure: unable to parse ID of a category in the state {0}. Returning null.", kstate.Id));
return(null); // [TODO] no need due to schema check?
}
string id = categoryElem.Attribute(XMLFactory.IDREF_ATTR).Value;
// [SC] retrieve PCategory object by its id and add it to the rank object
PCategory category = categories[id];
if (category == null)
{
Log(Severity.Error
, String.Format("createKStructure: category {0} from the state {1} is not found in the list of categories. Returning null."
, id, kstate.Id));
return(null); // [TODO] no need due to schema check?
}
kstate.addCategory(category);
}
// [SC] iterate through 'TwoA/KStructure/KSRank/KState/PreviousStates/KState' elements
nodeNames = new XName[] { XMLFactory.PREV_STATES_ELEM, XMLFactory.KSTATE_ELEM };
foreach (XElement prevStateElem in SelectNodes(stateElem, nodeNames))
{
// [SC] parse 'TwoA/KStructure/KSRank/KState/PreviousStates/KState@xsd:idref' attribute
if (prevStateElem.Attribute(XMLFactory.IDREF_ATTR) == null)
{
Log(Severity.Error, String.Format("createKStructure: unable to parse ID of a previous state for a state {0}. Returning null.", kstate.Id));
return(null); // [TODO] no need due to schema check?
}
string id = prevStateElem.Attribute(XMLFactory.IDREF_ATTR).Value;
// [SC] retrieve prev state object by its id and add it to the current state object
KState prevState = states[id];
if (prevState == null)
{
Log(Severity.Error, String.Format("createKStructure: unable to find previously created state object with id '{0}'. Returning null.", id));
return(null); // [TODO] no need due to schema check?
}
kstate.addPrevState(prevState);
prevState.addNextState(kstate);
}
states.Add(kstate.Id, kstate);
ksrank.addState(kstate);
}
kStructure.addRank(ksrank);
}
return(kStructure);
}
