public FactTypeChainer(FactTypeMappingDictionary predecidedManyToOneFactTypeMappings, FactTypeMappingDictionary predecidedOneToOneFactTypeMappings, FactTypeMappingListDictionary undecidedOneToOneFactTypeMappings)
{
myChains = new ChainList();
myPredecidedManyToOneFactTypeMappings = predecidedManyToOneFactTypeMappings;
myPredecidedOneToOneFactTypeMappings = predecidedOneToOneFactTypeMappings;
myUndecidedOneToOneFactTypeMappings = undecidedOneToOneFactTypeMappings;
}
/// <summary>
/// Determins wheather or not an object type has any possible (potential or decided)
/// deep fact type mappings away from it.
/// </summary>
/// <param name="objectType">The object type to consider</param>
/// <param name="excludedFactType">The fact type to ignore. This parameter may be null.</param>
/// <param name="decidedFactTypeMappings">The decided <see cref="FactTypeMapping"/> objects.</param>
/// <param name="undecidedFactTypeMappings">The undecided <see cref="FactTypeMapping"/> possibilities.</param>
/// <returns>True if objectType has possible deep mappings away from it, otherwise false.</returns>
private bool ObjectTypeHasPossibleDeepMappingsAway(ObjectType objectType, FactType excludedFactType, FactTypeMappingDictionary decidedFactTypeMappings, FactTypeMappingListDictionary undecidedFactTypeMappings)
{
LinkedElementCollection<Role> rolesPlayed = ObjectTypePlaysRole.GetPlayedRoleCollection(objectType);
foreach (Role rolePlayed in rolesPlayed)
{
// NOTE: We don't need the ShouldIgnoreFactType filter here, because fact types that we want to ignore won't be in the dictionaries in the first place.
FactType factType = rolePlayed.BinarizedFactType;
if (factType == excludedFactType)
{
continue;
}
FactTypeMapping decidedFactTypeMapping;
bool decidedFactTypeMappingExists = decidedFactTypeMappings.TryGetValue(factType, out decidedFactTypeMapping);
FactTypeMappingList potentialFactTypeMappings;
bool potentialFactTypeMappingsExist = undecidedFactTypeMappings.TryGetValue(factType, out potentialFactTypeMappings);
// If there's a decided deep fact type mapping away from objectType...
if (decidedFactTypeMappingExists && decidedFactTypeMapping.MappingDepth == MappingDepth.Deep && decidedFactTypeMapping.FromObjectType == objectType)
{
return true;
}
else if (potentialFactTypeMappingsExist)
{
foreach (FactTypeMapping potentialFactTypeMapping in potentialFactTypeMappings)
{
// If there's a potential deep fact type mapping away from objectType...
if (potentialFactTypeMapping.MappingDepth == MappingDepth.Deep && potentialFactTypeMapping.FromObjectType == objectType)
{
return true;
}
}
}
}
return false;
}
/// <summary>
/// Maps one-to-one fact types with two simple alethic mandatories away from the object type that has no possible
/// (potential or decided) deep mappings away from it. If both role players meet this criteria then no action is
/// taken.
/// </summary>
/// <param name="decidedOneToOneFactTypeMappings">The decided <see cref="FactTypeMapping"/> objects.</param>
/// <param name="undecidedOneToOneFactTypeMappings">The undecided <see cref="FactTypeMapping"/> posibilities.</param>
/// <returns>The number of previously potential one-to-one fact type mappings that are now decided.</returns>
private int MapTrivialOneToOneFactTypesWithTwoMandatories(FactTypeMappingDictionary decidedOneToOneFactTypeMappings, FactTypeMappingListDictionary undecidedOneToOneFactTypeMappings)
{
List<FactType> factTypesPendingDeletion = new List<FactType>();
foreach (KeyValuePair<FactType, FactTypeMappingList> undecidedPair in undecidedOneToOneFactTypeMappings)
{
FactType factType = undecidedPair.Key;
FactTypeMappingList potentialFactTypeMappings = undecidedPair.Value;
LinkedElementCollection<RoleBase> roles = factType.RoleCollection;
Debug.Assert(roles.Count == 2, "All fact type mappings should be for fact types with exactly two roles.");
Role firstRole = roles[0].Role;
Role secondRole = roles[1].Role;
ObjectType firstRolePlayer = firstRole.RolePlayer;
ObjectType secondRolePlayer = secondRole.RolePlayer;
// If this is a one-to-one fact type with two simple alethic mandatories...
if (firstRole.SingleRoleAlethicMandatoryConstraint != null && secondRole.SingleRoleAlethicMandatoryConstraint != null)
{
FactTypeMapping deepMappingTowardsFirstRole = null;
FactTypeMapping deepMappingTowardsSecondRole = null;
// Find our potential deep mappings.
foreach (FactTypeMapping potentialFactTypeMapping in potentialFactTypeMappings)
{
if (potentialFactTypeMapping.MappingDepth == MappingDepth.Deep)
{
if (potentialFactTypeMapping.TowardsRole == firstRole)
{
deepMappingTowardsFirstRole = potentialFactTypeMapping;
}
else
{
Debug.Assert(potentialFactTypeMapping.TowardsRole == secondRole);
deepMappingTowardsSecondRole = potentialFactTypeMapping;
}
}
}
bool firstRolePlayerHasPossibleDeepMappingsAway = ObjectTypeHasPossibleDeepMappingsAway(firstRolePlayer, factType, decidedOneToOneFactTypeMappings, undecidedOneToOneFactTypeMappings);
bool secondRolePlayerHasPossibleDeepMappingsAway = ObjectTypeHasPossibleDeepMappingsAway(secondRolePlayer, factType, decidedOneToOneFactTypeMappings, undecidedOneToOneFactTypeMappings);
// UNDONE: We need to do cycle checking at or before this point, since otherwise this can create a decided deep mapping cycle.
// If secondRolePlayer has no possible deep mappings away from it, and firstRolePlayer does...
if (firstRolePlayerHasPossibleDeepMappingsAway && !secondRolePlayerHasPossibleDeepMappingsAway)
{
// Make sure that this deep mapping was one of our potentials.
if (deepMappingTowardsFirstRole != null)
{
Debug.Assert(firstRole.SingleRoleAlethicUniquenessConstraint != null);
// Make sure we're not going towards a preferred identifier. Doing so is valid, and sometimes optimal,
// but not always, hence the permuter needs to consider it.
if (!firstRole.SingleRoleAlethicUniquenessConstraint.IsPreferred)
{
// Deep map toward firstRolePlayer
decidedOneToOneFactTypeMappings.Add(factType, deepMappingTowardsFirstRole);
factTypesPendingDeletion.Add(factType);
}
}
}
// ...and vice-versa...
else if (!firstRolePlayerHasPossibleDeepMappingsAway && secondRolePlayerHasPossibleDeepMappingsAway)
{
// Make sure that this deep mapping was one of our potentials.
if (deepMappingTowardsSecondRole != null)
{
Debug.Assert(secondRole.SingleRoleAlethicUniquenessConstraint != null);
// Make sure we're not going towards a preferred identifier. Doing so is valid, and sometimes optimal,
// but not always, hence the permuter needs to consider it.
if (!secondRole.SingleRoleAlethicUniquenessConstraint.IsPreferred)
{
// Deep map toward secondRolePlayer
decidedOneToOneFactTypeMappings.Add(factType, deepMappingTowardsSecondRole);
factTypesPendingDeletion.Add(factType);
}
}
}
}
}
// Delete each undecided (now decided) fact type mapping marked for deletion.
foreach (FactType key in factTypesPendingDeletion)
{
undecidedOneToOneFactTypeMappings.Remove(key);
}
return factTypesPendingDeletion.Count;
}
/// <summary>
/// Filters out deep potential mappings that are from an <see cref="ObjectType"/> that already has a decided deep
/// mapping from it.
/// </summary>
/// <param name="decidedOneToOneFactTypeMappings">The decided <see cref="FactTypeMapping"/> objects.</param>
/// <param name="undecidedOneToOneFactTypeMappings">The undecided <see cref="FactTypeMapping"/> possibilities.</param>
private void RemoveImpossiblePotentialFactTypeMappings(FactTypeMappingDictionary decidedOneToOneFactTypeMappings, FactTypeMappingListDictionary undecidedOneToOneFactTypeMappings)
{
Dictionary<ObjectType, object> deeplyMappedObjectTypes = new Dictionary<ObjectType, object>(decidedOneToOneFactTypeMappings.Count + undecidedOneToOneFactTypeMappings.Count);
// For each decided fact type mapping...
foreach (FactTypeMapping factTypeMapping in decidedOneToOneFactTypeMappings.Values)
{
// If it's a deep mapping...
if (factTypeMapping.MappingDepth == MappingDepth.Deep)
{
deeplyMappedObjectTypes[factTypeMapping.FromObjectType] = null;
}
}
List<FactType> factsPendingDeletion = new List<FactType>();
foreach (KeyValuePair<FactType, FactTypeMappingList> undecidedFactTypeMapping in undecidedOneToOneFactTypeMappings)
{
FactType factType = undecidedFactTypeMapping.Key;
FactTypeMappingList potentialFactTypeMappings = undecidedFactTypeMapping.Value;
// For each potential fact type mapping...
for (int i = potentialFactTypeMappings.Count - 1; i >= 0; --i)
{
FactTypeMapping potentialFactTypeMapping = potentialFactTypeMappings[i];
// If it is maped away from an ObjectType that is already determined to be mapped elsewhere...
if (potentialFactTypeMapping.MappingDepth == MappingDepth.Deep && deeplyMappedObjectTypes.ContainsKey(potentialFactTypeMapping.FromObjectType))
{
// Remove it as a possibility.
potentialFactTypeMappings.RemoveAt(i);
}
}
Debug.Assert(potentialFactTypeMappings.Count > 0);
// If there is only one possibility left...
if (potentialFactTypeMappings.Count == 1)
{
// Mark it decided.
decidedOneToOneFactTypeMappings.Add(factType, potentialFactTypeMappings[0]);
factsPendingDeletion.Add(factType);
}
}
// Delete each undecided (now decided) fact type mapping marked for deletion.
foreach (FactType key in factsPendingDeletion)
{
undecidedOneToOneFactTypeMappings.Remove(key);
}
}
/// <summary>
/// Runs various algorithms on the undecided fact type mappings in an attempt to decide as many as possible.
/// </summary>
/// <param name="decidedManyToOneFactTypeMappings">The decided many-to-one <see cref="FactTypeMapping"/> objects.</param>
/// <param name="decidedOneToOneFactTypeMappings">The decided one-to-one <see cref="FactTypeMapping"/> objects.</param>
/// <param name="undecidedOneToOneFactTypeMappings">The undecided <see cref="FactTypeMapping"/> possibilities.</param>
private void FilterFactTypeMappings(FactTypeMappingDictionary decidedManyToOneFactTypeMappings, FactTypeMappingDictionary decidedOneToOneFactTypeMappings, FactTypeMappingListDictionary undecidedOneToOneFactTypeMappings)
{
bool changed;
do
{
RemoveImpossiblePotentialFactTypeMappings(decidedOneToOneFactTypeMappings, undecidedOneToOneFactTypeMappings);
changed = MapTrivialOneToOneFactTypesWithTwoMandatories(decidedOneToOneFactTypeMappings, undecidedOneToOneFactTypeMappings) > 0;
} while (changed);
}
/// <summary>
/// Determines the obvious fact type mappings, and all other potential mappings.
/// </summary>
/// <param name="modelFactTypes">The <see cref="FactType"/> objects of the model</param>
/// <param name="decidedManyToOneFactTypeMappings">The decided many-to-one <see cref="FactTypeMapping"/> objects.</param>
/// <param name="decidedOneToOneFactTypeMappings">The decided one-to-one <see cref="FactTypeMapping"/> objects.</param>
/// <param name="undecidedOneToOneFactTypeMappings">The undecided <see cref="FactTypeMapping"/> possibilities.</param>
private void PerformInitialFactTypeMappings(LinkedElementCollection<FactType> modelFactTypes, FactTypeMappingDictionary decidedManyToOneFactTypeMappings, FactTypeMappingDictionary decidedOneToOneFactTypeMappings, FactTypeMappingListDictionary undecidedOneToOneFactTypeMappings)
{
// For each fact type in the model...
foreach (FactType factType in modelFactTypes)
{
if (ShouldIgnoreFactType(factType))
{
continue;
}
SubtypeFact subtypeFact = factType as SubtypeFact;
// If it's a subtype relation...
MandatoryConstraint mandatory;
if (subtypeFact != null)
{
Role subtypeRole = subtypeFact.SubtypeRole;
Role supertypeRole = subtypeFact.SupertypeRole;
mandatory = supertypeRole.SingleRoleAlethicMandatoryConstraint; // Note that the only way to get a mandatory on the supertype role is with an implied mandatory, verified explicitly below
// Map deeply toward the supertype.
FactTypeMapping factTypeMapping = new FactTypeMapping(
subtypeFact,
subtypeRole,
supertypeRole,
FactTypeMappingFlags.Subtype | FactTypeMappingFlags.DeepMapping | FactTypeMappingFlags.FromRoleMandatory | ((mandatory != null && mandatory.IsImplied) ? FactTypeMappingFlags.TowardsRoleMandatory | FactTypeMappingFlags.TowardsRoleImpliedMandatory : FactTypeMappingFlags.None) | (subtypeRole.RolePlayer.IsValueType ? FactTypeMappingFlags.FromValueType | FactTypeMappingFlags.TowardsValueType : FactTypeMappingFlags.None));
decidedOneToOneFactTypeMappings.Add(subtypeFact, factTypeMapping);
}
else
{
LinkedElementCollection<RoleBase> roles = factType.RoleCollection;
Debug.Assert(roles.Count == 2 && (factType.Objectification == null || factType.UnaryRole != null), "Non-binarized fact types should have been filtered out already.");
Role firstRole = roles[0].Role;
Role secondRole = roles[1].Role;
ObjectType firstRolePlayer = firstRole.RolePlayer;
ObjectType secondRolePlayer = secondRole.RolePlayer;
UniquenessConstraint firstRoleUniquenessConstraint = (UniquenessConstraint)firstRole.SingleRoleAlethicUniquenessConstraint;
UniquenessConstraint secondRoleUniquenessConstraint = (UniquenessConstraint)secondRole.SingleRoleAlethicUniquenessConstraint;
bool firstRolePlayerIsValueType = firstRolePlayer.IsValueType;
bool secondRolePlayerIsValueType = secondRolePlayer.IsValueType;
bool firstRoleIsUnique = (firstRoleUniquenessConstraint != null);
bool secondRoleIsUnique = (secondRoleUniquenessConstraint != null);
bool firstRoleIsMandatory = null != (mandatory = firstRole.SingleRoleAlethicMandatoryConstraint);
bool firstRoleIsImplicitlyMandatory = firstRoleIsMandatory && mandatory.IsImplied;
bool firstRoleIsExplicitlyMandatory = firstRoleIsMandatory && !firstRoleIsImplicitlyMandatory;
bool secondRoleIsMandatory = null != (mandatory = secondRole.SingleRoleAlethicMandatoryConstraint);
bool secondRoleIsImplicitlyMandatory = secondRoleIsMandatory && mandatory.IsImplied;
bool secondRoleIsExplicitlyMandatory = secondRoleIsMandatory && !secondRoleIsImplicitlyMandatory;
// We don't need to worry about shallow mappings towards preferred identifiers on many-to-ones, since the preferred
// identifier pattern ensures that these cases will always map towards the object type being identified anyway.
const int FIRST_SECOND_SHALLOW = 1;
const int FIRST_SECOND_DEEP = 2;
const int SECOND_FIRST_SHALLOW = 4;
const int SECOND_FIRST_DEEP = 8;
int possibilityBits = 0;
bool manyToOne = false;
// If only firstRole is unique...
if (firstRoleIsUnique && !secondRoleIsUnique)
{
// Shallow map toward firstRolePlayer.
possibilityBits |= SECOND_FIRST_SHALLOW;
manyToOne = true;
}
else if (!firstRoleIsUnique && secondRoleIsUnique) // ...only secondRole is unique...
{
// Shallow map toward secondRolePlayer.
possibilityBits |= FIRST_SECOND_SHALLOW;
manyToOne = true;
}
else if (firstRoleIsUnique && secondRoleIsUnique) // ...both roles are unique...
{
// If this is a ring fact type...
if (firstRolePlayer == secondRolePlayer)
{
// If only firstRole is mandatory...
if (firstRoleIsExplicitlyMandatory && !secondRoleIsExplicitlyMandatory)
{
// Shallow map toward firstRolePlayer (mandatory role player).
possibilityBits |= FIRST_SECOND_SHALLOW;
}
else if (!firstRoleIsExplicitlyMandatory && secondRoleIsExplicitlyMandatory) // ...only secondRole is mandatory...
{
// Shallow map toward secondRolePlayer (mandatory role player).
possibilityBits |= SECOND_FIRST_SHALLOW;
}
else // ...otherwise...
{
// Shallow map toward firstRolePlayer.
possibilityBits |= FIRST_SECOND_SHALLOW;
}
}
else // ...not a ring fact type...
{
// These are used to make sure that we never shallowly map towards a preferred identifier.
bool firstRoleIsUniqueAndPreferred = firstRoleIsUnique && firstRoleUniquenessConstraint.IsPreferred;
bool secondRoleIsUniqueAndPreferred = secondRoleIsUnique && secondRoleUniquenessConstraint.IsPreferred;
// If neither role is mandatory...
if (!firstRoleIsExplicitlyMandatory && !secondRoleIsExplicitlyMandatory)
{
// If firstRole is not preferred...
if (!firstRoleIsUniqueAndPreferred)
{
// Shallow map toward firstRolePlayer.
possibilityBits |= SECOND_FIRST_SHALLOW;
}
// If secondRole is not preferred...
if (!secondRoleIsUniqueAndPreferred)
{
// Shallow map toward secondRolePlayer.
possibilityBits |= FIRST_SECOND_SHALLOW;
}
}
else if (firstRoleIsExplicitlyMandatory && !secondRoleIsExplicitlyMandatory) // ...only firstRole is mandatory...
{
// Note that the first role cannot be be preferred if the second role is not mandatory
// Shallow map toward firstRolePlayer.
possibilityBits |= SECOND_FIRST_SHALLOW;
#if FALSE
// UNDONE: This is a much deeper check for 1-1 patterns off of mandatory constraints. Both this and
// the current much quicker check are meant to limit permutation checks on patterns where numerous
// 1-1 fact types reference the same optional role player. Both of these systems are extremely fragile
// to one of the uses of the value being made mandatory, in which case this loop does not apply.
// We need to find a quicker mechanism for determining when we should allow an absorption towards
// a fully optional object type, or some other check to eliminate extremely long chains (these can
// easily consume all memory on a machine).
bool allowMappingTowardsOptionalRole = true;
if (null != (mandatory = secondRolePlayer.ImpliedMandatoryConstraint))
{
if (!(secondRoleIsUniqueAndPreferred && factType.ImpliedByObjectification != null))
{
foreach (Role testRole in mandatory.RoleCollection)
{
if (testRole != secondRole && !ShouldIgnoreFactType((testRole.Proxy ?? (RoleBase)testRole).FactType))
{
Role oppositeRole;
if (testRole.SingleRoleAlethicUniquenessConstraint != null &&
null != (oppositeRole = testRole.OppositeRoleAlwaysResolveProxy as Role) &&
null != oppositeRole.SingleRoleAlethicUniquenessConstraint &&
null != (mandatory = oppositeRole.SingleRoleAlethicMandatoryConstraint) &&
!mandatory.IsImplied)
{
// If there are multiple 1-1 mappings towards an object type with
// an implied mandatory, then don't consider any mappings towards
// this entity.
allowMappingTowardsOptionalRole = false;
break;
}
}
}
}
}
if (allowMappingTowardsOptionalRole)
#endif // FALSE
if (null == secondRolePlayer.ImpliedMandatoryConstraint ||
((secondRoleIsUniqueAndPreferred && !secondRolePlayerIsValueType) || factType.ImpliedByObjectification != null))
{
// If secondRole is not preferred...
if (!secondRoleIsUniqueAndPreferred)
{
// Shallow map toward secondRolePlayer.
possibilityBits |= FIRST_SECOND_SHALLOW;
}
// Deep map toward secondRolePlayer.
possibilityBits |= FIRST_SECOND_DEEP;
}
}
else if (!firstRoleIsExplicitlyMandatory && secondRoleIsExplicitlyMandatory) // ...only secondRole is mandatory...
{
// Note that the second role cannot be preferred if the first role is not mandatory
// Shallow map toward secondRolePlayer.
possibilityBits |= FIRST_SECOND_SHALLOW;
#if FALSE
// UNDONE: See comments above, duplicate code switching first and second
bool allowMappingTowardsOptionalRole = true;
if (null != (mandatory = firstRolePlayer.ImpliedMandatoryConstraint))
{
if (!(firstRoleIsUniqueAndPreferred && factType.ImpliedByObjectification != null))
{
foreach (Role testRole in mandatory.RoleCollection)
{
if (testRole != firstRole && !ShouldIgnoreFactType((testRole.Proxy ?? (RoleBase)testRole).FactType))
{
Role oppositeRole;
if (testRole.SingleRoleAlethicUniquenessConstraint != null &&
null != (oppositeRole = testRole.OppositeRoleAlwaysResolveProxy as Role) &&
null != oppositeRole.SingleRoleAlethicUniquenessConstraint &&
null != (mandatory = oppositeRole.SingleRoleAlethicMandatoryConstraint) &&
!mandatory.IsImplied)
{
// If there are multiple 1-1 mappings towards an object type with
// an implied mandatory, then don't consider any mappings towards
// this entity.
allowMappingTowardsOptionalRole = false;
break;
}
}
}
}
}
if (allowMappingTowardsOptionalRole)
#endif // FALSE
if (null == firstRolePlayer.ImpliedMandatoryConstraint ||
((firstRoleIsUniqueAndPreferred && !firstRolePlayerIsValueType) || factType.ImpliedByObjectification != null))
{
// If firstRole is not preferred...
if (!firstRoleIsUniqueAndPreferred)
{
// Shallow map toward firstRolePlayer.
possibilityBits |= SECOND_FIRST_SHALLOW;
}
// Deep map toward firstRolePlayer.
possibilityBits |= SECOND_FIRST_DEEP;
}
}
else // ...both roles are mandatory...
{
// If firstRole is not preferred...
if (!firstRoleIsUniqueAndPreferred)
{
// Shallow map toward firstRolePlayer.
possibilityBits |= SECOND_FIRST_SHALLOW;
}
// If secondRole is not preferred...
if (!secondRoleIsUniqueAndPreferred)
{
// Shallow map toward secondRolePlayer.
possibilityBits |= FIRST_SECOND_SHALLOW;
}
// Possible deep map toward firstRolePlayer and toward secondRolePlayer
possibilityBits |= FIRST_SECOND_DEEP | SECOND_FIRST_DEEP;
}
}
}
Debug.Assert(possibilityBits != 0);
switch (possibilityBits)
{
case FIRST_SECOND_SHALLOW:
(manyToOne ? decidedManyToOneFactTypeMappings : decidedOneToOneFactTypeMappings).Add(factType, new FactTypeMapping(factType, firstRole, secondRole, GetFlags(false, firstRolePlayerIsValueType, firstRoleIsMandatory, firstRoleIsImplicitlyMandatory, secondRolePlayerIsValueType, secondRoleIsMandatory, secondRoleIsImplicitlyMandatory)));
break;
case SECOND_FIRST_SHALLOW:
(manyToOne ? decidedManyToOneFactTypeMappings : decidedOneToOneFactTypeMappings).Add(factType, new FactTypeMapping(factType, secondRole, firstRole, GetFlags(false, secondRolePlayerIsValueType, secondRoleIsMandatory, secondRoleIsImplicitlyMandatory, firstRolePlayerIsValueType, firstRoleIsMandatory, firstRoleIsImplicitlyMandatory)));
break;
case FIRST_SECOND_DEEP:
(manyToOne ? decidedManyToOneFactTypeMappings : decidedOneToOneFactTypeMappings).Add(factType, new FactTypeMapping(factType, firstRole, secondRole, GetFlags(true, firstRolePlayerIsValueType, firstRoleIsMandatory, firstRoleIsImplicitlyMandatory, secondRolePlayerIsValueType, secondRoleIsMandatory, secondRoleIsImplicitlyMandatory)));
break;
case SECOND_FIRST_DEEP:
(manyToOne ? decidedManyToOneFactTypeMappings : decidedOneToOneFactTypeMappings).Add(factType, new FactTypeMapping(factType, secondRole, firstRole, GetFlags(true, secondRolePlayerIsValueType, secondRoleIsMandatory, secondRoleIsImplicitlyMandatory, firstRolePlayerIsValueType, firstRoleIsMandatory, firstRoleIsImplicitlyMandatory)));
break;
default:
{
// UNDONE: I don't see any reason to use a heavy-weight list structure here. The
// same information could be stored in an UndecidedFactTypeMapping structure that
// uses a bit field mechanism similar to this block of code. This would allow us
// to store the factType/firstRole/secondRole once and interpret the contents based
// on a single bitfield. In the meantime, keep the list as small as possible.
int countBits = possibilityBits;
int count = 0;
while (countBits != 0)
{
if (0 != (countBits & 1))
{
++count;
}
countBits >>= 1;
}
FactTypeMappingList potentialMappingList = new FactTypeMappingList(count);
count = -1;
if (0 != (possibilityBits & FIRST_SECOND_SHALLOW))
{
potentialMappingList.Add(new FactTypeMapping(factType, firstRole, secondRole, GetFlags(false, firstRolePlayerIsValueType, firstRoleIsMandatory, firstRoleIsImplicitlyMandatory, secondRolePlayerIsValueType, secondRoleIsMandatory, secondRoleIsImplicitlyMandatory)));
}
if (0 != (possibilityBits & SECOND_FIRST_SHALLOW))
{
potentialMappingList.Add(new FactTypeMapping(factType, secondRole, firstRole, GetFlags(false, secondRolePlayerIsValueType, secondRoleIsMandatory, secondRoleIsImplicitlyMandatory, firstRolePlayerIsValueType, firstRoleIsMandatory, firstRoleIsImplicitlyMandatory)));
}
if (0 != (possibilityBits & FIRST_SECOND_DEEP))
{
potentialMappingList.Add(new FactTypeMapping(factType, firstRole, secondRole, GetFlags(true, firstRolePlayerIsValueType, firstRoleIsMandatory, firstRoleIsImplicitlyMandatory, secondRolePlayerIsValueType, secondRoleIsMandatory, secondRoleIsImplicitlyMandatory)));
}
if (0 != (possibilityBits & SECOND_FIRST_DEEP))
{
potentialMappingList.Add(new FactTypeMapping(factType, secondRole, firstRole, GetFlags(true, secondRolePlayerIsValueType, secondRoleIsMandatory, secondRoleIsImplicitlyMandatory, firstRolePlayerIsValueType, firstRoleIsMandatory, firstRoleIsImplicitlyMandatory)));
}
undecidedOneToOneFactTypeMappings.Add(factType, potentialMappingList);
break;
}
}
}
}
}
/// <summary>
/// Transforms the data in <see cref="ORMModel"/> into this <see cref="AbstractionModel"/>.
/// </summary>
private void TransformORMtoOial()
{
ORMModel model = this.ORMModel;
LinkedElementCollection<FactType> modelFactTypes = model.FactTypeCollection;
FactTypeMappingDictionary decidedManyToOneFactTypeMappings = new FactTypeMappingDictionary();
FactTypeMappingDictionary decidedOneToOneFactTypeMappings = new FactTypeMappingDictionary();
FactTypeMappingListDictionary undecidedOneToOneFactTypeMappings = new FactTypeMappingListDictionary();
PerformInitialFactTypeMappings(modelFactTypes, decidedManyToOneFactTypeMappings, decidedOneToOneFactTypeMappings, undecidedOneToOneFactTypeMappings);
FilterFactTypeMappings(decidedManyToOneFactTypeMappings, decidedOneToOneFactTypeMappings, undecidedOneToOneFactTypeMappings);
FactTypeMappingPermuter permuter = new FactTypeMappingPermuter(decidedManyToOneFactTypeMappings, decidedOneToOneFactTypeMappings, undecidedOneToOneFactTypeMappings);
FactTypeMappingDictionary decidedFactTypeMappings = permuter.Run();
GenerateOialModel(decidedFactTypeMappings);
}
public FactTypeMappingPermuter(FactTypeMappingDictionary predecidedManyToOneFactTypeMappings, FactTypeMappingDictionary predecidedOneToOneFactTypeMappings, FactTypeMappingListDictionary undecidedOneToOneFactTypeMappings)
{
myPredecidedManyToOneFactTypeMappings = predecidedManyToOneFactTypeMappings;
myPredecidedOneToOneFactTypeMappings = predecidedOneToOneFactTypeMappings;
myUndecidedOneToOneFactTypeMappings = undecidedOneToOneFactTypeMappings;
myDecidedFactTypeMappings = new FactTypeMappingDictionary(predecidedManyToOneFactTypeMappings.Count + predecidedOneToOneFactTypeMappings.Count + undecidedOneToOneFactTypeMappings.Count);
foreach (KeyValuePair<FactType, FactTypeMapping> pair in predecidedManyToOneFactTypeMappings)
{
myDecidedFactTypeMappings.Add(pair.Key, pair.Value);
}
foreach (KeyValuePair<FactType, FactTypeMapping> pair in predecidedOneToOneFactTypeMappings)
{
myDecidedFactTypeMappings.Add(pair.Key, pair.Value);
}
}
/// <summary>
/// If the number of undecided elements is unreasonably high,
/// then apply incrementally more stringent requirements for
/// deciding fact type mappings until we have a reasonable number.
/// </summary>
public void EnsureReasonablePermutations(FactTypeMappingListDictionary allUndecidedMappings, FactTypeMappingDictionary allPredecidedMappings, FactTypeMappingDictionary allDecidedMappings)
{
FactTypeMappingListList undecidedMappings = myUndecidedOneToOneFactTypeMappings;
double maxPermutations = CalculateMaxNumberOfPermutations(undecidedMappings);
if (maxPermutations > MaxReasonablePermutations)
{
int undecidedMappingCount = undecidedMappings.Count;
Predicate <FactTypeMapping>[] reductionConditions = ReductionConditions;
if (reductionConditions == null)
{
// Note that there is intentionally a lot of duplication in
// these routines. An earlier design attempted to call previous
// conditions along with later ones, but this resulted in a much
// more complicated algorithm and multiple calls. The algorithm
// was simplified in exchange for making these condition routines
// more complicated.
reductionConditions = new Predicate <FactTypeMapping>[] {
delegate(FactTypeMapping mapping)
{
// If the fact type has a single non-mandatory value type
// then do not map towards the value type.
FactTypeMappingFlags mappingFlags = mapping.Flags;
if ((mappingFlags & (FactTypeMappingFlags.TowardsValueType | FactTypeMappingFlags.FromValueType)) == (FactTypeMappingFlags.TowardsValueType))
{
if (0 != (mappingFlags & FactTypeMappingFlags.TowardsRoleMandatory))
{
return(0 != (mappingFlags & FactTypeMappingFlags.TowardsRoleImpliedMandatory));
}
return(true);
}
return(false);
},
delegate(FactTypeMapping mapping)
{
// If the fact type has an unbalanced mandatory and is not a subtype,
// then map towards the mandatory.
FactTypeMappingFlags mappingFlags = mapping.Flags;
if (FactTypeMappingFlags.FromRoleMandatory == (mappingFlags & (FactTypeMappingFlags.FromRoleMandatory | FactTypeMappingFlags.FromRoleImpliedMandatory)) &&
0 == (mappingFlags & FactTypeMappingFlags.Subtype) &&
FactTypeMappingFlags.TowardsRoleMandatory != (mappingFlags & (FactTypeMappingFlags.TowardsRoleMandatory | FactTypeMappingFlags.TowardsRoleImpliedMandatory)))
{
return(true);
}
// Duplicate previous ValueType check
if ((mappingFlags & (FactTypeMappingFlags.TowardsValueType | FactTypeMappingFlags.FromValueType)) == (FactTypeMappingFlags.TowardsValueType))
{
if (0 != (mappingFlags & FactTypeMappingFlags.TowardsRoleMandatory))
{
return(0 != (mappingFlags & FactTypeMappingFlags.TowardsRoleImpliedMandatory));
}
return(true);
}
return(false);
},
delegate(FactTypeMapping mapping)
{
// Map away from a preferred identifier. This is not a cumulative test, and is ignored for later conditions.
FactTypeMappingFlags mappingFlags = mapping.Flags;
if (0 == (mappingFlags & FactTypeMappingFlags.FromPreferredIdentifier))
{
return(true);
}
// Duplicate unbalanced ValueType and unbalanced mandatory checks
if (FactTypeMappingFlags.FromRoleMandatory == (mappingFlags & (FactTypeMappingFlags.FromRoleMandatory | FactTypeMappingFlags.FromRoleImpliedMandatory)) &&
0 == (mappingFlags & FactTypeMappingFlags.Subtype) &&
FactTypeMappingFlags.TowardsRoleMandatory != (mappingFlags & (FactTypeMappingFlags.TowardsRoleMandatory | FactTypeMappingFlags.TowardsRoleImpliedMandatory)))
{
return(true);
}
if ((mappingFlags & (FactTypeMappingFlags.TowardsValueType | FactTypeMappingFlags.FromValueType)) == (FactTypeMappingFlags.TowardsValueType))
{
if (0 != (mappingFlags & FactTypeMappingFlags.TowardsRoleMandatory))
{
return(0 != (mappingFlags & FactTypeMappingFlags.TowardsRoleImpliedMandatory));
}
return(true);
}
return(false);
},
delegate(FactTypeMapping mapping)
{
// Prefer a shallow mapping.
FactTypeMappingFlags mappingFlags = mapping.Flags;
if (0 != (mappingFlags & FactTypeMappingFlags.DeepMapping))
{
return(true);
}
// Duplicate unbalanced ValueType and unbalanced mandatory checks
if (FactTypeMappingFlags.FromRoleMandatory == (mappingFlags & (FactTypeMappingFlags.FromRoleMandatory | FactTypeMappingFlags.FromRoleImpliedMandatory)) &&
0 == (mappingFlags & FactTypeMappingFlags.Subtype) &&
FactTypeMappingFlags.TowardsRoleMandatory != (mappingFlags & (FactTypeMappingFlags.TowardsRoleMandatory | FactTypeMappingFlags.TowardsRoleImpliedMandatory)))
{
return(true);
}
if ((mappingFlags & (FactTypeMappingFlags.TowardsValueType | FactTypeMappingFlags.FromValueType)) == (FactTypeMappingFlags.TowardsValueType))
{
if (0 != (mappingFlags & FactTypeMappingFlags.TowardsRoleMandatory))
{
return(0 != (mappingFlags & FactTypeMappingFlags.TowardsRoleImpliedMandatory));
}
return(true);
}
return(false);
},
delegate(FactTypeMapping mapping)
{
// If we have too many permutations then just map towards the first role.
// Yes, this is completely arbitrary, but getting anywhere past item 2 on
// this list will be extremely rarely and represents truly pathological cases.
// Perform previous flag-based checks first.
FactTypeMappingFlags mappingFlags = mapping.Flags;
if (0 != (mappingFlags & FactTypeMappingFlags.DeepMapping))
{
return(true);
}
if (FactTypeMappingFlags.FromRoleMandatory == (mappingFlags & (FactTypeMappingFlags.FromRoleMandatory | FactTypeMappingFlags.FromRoleImpliedMandatory)) &&
0 == (mappingFlags & FactTypeMappingFlags.Subtype) &&
FactTypeMappingFlags.TowardsRoleMandatory != (mappingFlags & (FactTypeMappingFlags.TowardsRoleMandatory | FactTypeMappingFlags.TowardsRoleImpliedMandatory)))
{
return(true);
}
if ((mappingFlags & (FactTypeMappingFlags.TowardsValueType | FactTypeMappingFlags.FromValueType)) == (FactTypeMappingFlags.TowardsValueType))
{
if (0 != (mappingFlags & FactTypeMappingFlags.TowardsRoleMandatory))
{
return(0 != (mappingFlags & FactTypeMappingFlags.TowardsRoleImpliedMandatory));
}
return(true);
}
Role role = mapping.TowardsRole;
return(0 != mapping.FactType.RoleCollection.IndexOf((RoleBase)role.Proxy ?? role));
},
};
ReductionConditions = reductionConditions;
}
FactTypeMappingList decidedMappings = myPredecidedOneToOneFactTypeMappings;
for (int maxReduction = 0; maxReduction < reductionConditions.Length; ++maxReduction)
{
for (int undecidedMappingIndex = undecidedMappingCount - 1; undecidedMappingIndex >= 0; --undecidedMappingIndex)
{
FactTypeMappingList testMappings = undecidedMappings[undecidedMappingIndex];
int testMappingCount = testMappings.Count;
// Note that the max length of this list is four (shallow and deep both directions)
FactTypeMapping singleMapping = null;
for (int i = 0; i < testMappingCount; ++i)
{
FactTypeMapping testMapping = testMappings[i];
if (!reductionConditions[maxReduction](testMapping))
{
// This test mapping is not filtered, allow it
if (singleMapping == null)
{
singleMapping = testMapping;
}
else
{
singleMapping = null;
break;
}
}
}
if (singleMapping != null)
{
decidedMappings.Add(singleMapping);
undecidedMappings.RemoveAt(undecidedMappingIndex);
--undecidedMappingCount;
maxPermutations /= testMappingCount;
FactType factTypeKey = singleMapping.FactType;
allUndecidedMappings.Remove(factTypeKey);
allPredecidedMappings.Add(factTypeKey, singleMapping);
allDecidedMappings.Add(factTypeKey, singleMapping);
}
}
if (maxPermutations <= MaxReasonablePermutations)
{
break;
}
}
}
}
