public Chain()
{
myObjectTypes = new List <ObjectType>();
myPredecidedManyToOneFactTypeMappings = new FactTypeMappingList();
myPredecidedOneToOneFactTypeMappings = new FactTypeMappingList();
myUndecidedOneToOneFactTypeMappings = new FactTypeMappingListList();
myPossiblePermutations = new List <Permutation>();
mySmallestPermutationsInTermsOfConceptTypes = new List <Permutation>();
}
/// <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>
/// Permutes the <see cref="FactTypeMapping"/>s, recursively.
/// </summary>
/// <param name="permutations">The collection containing <see cref="Permutation"/>s that have already been calculated, and to which newly calculated <see cref="Permutation"/>s are added.</param>
/// <param name="undecidedMappings">The list of potential <see cref="FactTypeMapping"/>s for each <see cref="FactType"/> that need to be permuted.</param>
/// <param name="decidedMappings">The <see cref="FactTypeMapping"/>s that have already been decided for this branch of the permutation. Should initially be empty.</param>
/// <param name="deeplyMappedObjectTypes"><see cref="ObjectType"/>s that already have some deep <see cref="FactTypeMapping"/> away from them.</param>
/// <param name="currentPosition">The index into <paramref name="undecidedMappings"/> that should be processed.</param>
private static void PermuteFactTypeMappings(IList<Permutation> permutations, FactTypeMappingListList undecidedMappings, FactTypeMappingList decidedMappings, Dictionary<ObjectType, object> deeplyMappedObjectTypes, int currentPosition)
{
int nextPosition = currentPosition + 1;
bool isLastUndecided = (nextPosition == undecidedMappings.Count);
foreach (FactTypeMapping potentialMapping in undecidedMappings[currentPosition])
{
if (potentialMapping.MappingDepth == MappingDepth.Deep && deeplyMappedObjectTypes.ContainsKey(potentialMapping.FromObjectType))
{
// We already have a deep mapping away from this object type, so we can skip this potential mapping (which would result in an illegal permutation).
continue;
}
// Put this potential mapping onto the stack of decided mappings.
decidedMappings.Add(potentialMapping);
if (isLastUndecided)
{
// This is the end of the list of undecided fact types, so we can create a permutation.
permutations.Add(new Permutation(new FactTypeMappingList(decidedMappings)));
}
else
{
if (potentialMapping.MappingDepth == MappingDepth.Deep)
{
// This is a deep mapping, so add the from object type to the set of deeply mapped object types.
deeplyMappedObjectTypes[potentialMapping.FromObjectType] = null;
}
// Go on to the potential mappings for the next undecided fact type.
PermuteFactTypeMappings(permutations, undecidedMappings, decidedMappings, deeplyMappedObjectTypes, nextPosition);
if (potentialMapping.MappingDepth == MappingDepth.Deep)
{
// Remove the from object type from the set of deeply mapped object types.
deeplyMappedObjectTypes.Remove(potentialMapping.FromObjectType);
}
}
// Pop this potential mapping off the stack of decided mappings so that we can go on to the next potential mapping.
decidedMappings.RemoveAt(decidedMappings.Count - 1);
}
}
private static FactTypeMapping FindDeepMappingAwayFromObjectType(ObjectType objectType, FactTypeMappingList predecidedOneToOneFactTypeMappings, FactTypeMappingList permutationFactTypeMappings)
{
// UNDONE: Figure out a way we can do this off of PlayedRoles instead, which should be faster.
foreach (FactTypeMapping mapping in predecidedOneToOneFactTypeMappings)
{
if (mapping.MappingDepth == MappingDepth.Deep && mapping.FromObjectType == objectType)
{
return mapping;
}
}
foreach (FactTypeMapping mapping in permutationFactTypeMappings)
{
if (mapping.MappingDepth == MappingDepth.Deep && mapping.FromObjectType == objectType)
{
return mapping;
}
}
return null;
}
private void PermuteFactTypeMappings()
{
// UNDONE: We should consider whether we can determine what object types will collapse earlier in the process, which would allow us to
// potentially eliminate multiple permutations that have the same result. (Rationale: When an object type is collapsed, it doesn't matter
// whether the mappings away from it are shallow or deep; they both result in the same output.)
int largestChainCount;
FactTypeMappingDictionary allDecidedMappings = myDecidedFactTypeMappings;
// Break up the chains of contiguous one-to-one fact types
FactTypeChainer chainer = new FactTypeChainer(myPredecidedManyToOneFactTypeMappings, myPredecidedOneToOneFactTypeMappings, myUndecidedOneToOneFactTypeMappings);
// If some chains end up at a size we cannot process, then running
// the chainer can move some mappings from undecided to predecided.
// We pass in the decided mappings so that we do not lose track
// of these entries.
largestChainCount = chainer.Run(allDecidedMappings);
// Perform one-time pass of top-level types for the decided mappings
//PrecalculateDecidedConceptTypes();
// This is used in PermuteFactTypeMappings(). We allocate it once, here, for permformance reasons.
FactTypeMappingList newlyDecidedFactTypeMappings = new FactTypeMappingList(largestChainCount);
// This is used to prevent deep mappings of an object type in two directions.
Dictionary<ObjectType, object> deeplyMappedObjectTypes = new Dictionary<ObjectType, object>(largestChainCount);
ChainPermutationState permutationStateHelper = new ChainPermutationState();
// Used to eliminate deep mappings towards simple identifiers
Dictionary<ObjectType, bool> nonPreferredFunctionalObjectTypesCache = new Dictionary<ObjectType, bool>();
// Loop through each chain, calculating the permutations.
foreach (Chain chain in chainer.Chains)
{
// Find the object types that we already know have deep mappings away from them.
foreach (FactTypeMapping decidedMapping in chain.PredecidedOneToOneFactTypeMappings)
{
if (decidedMapping.MappingDepth == MappingDepth.Deep)
{
deeplyMappedObjectTypes[decidedMapping.FromObjectType] = null;
}
}
PermuteFactTypeMappings(chain.PossiblePermutations, chain.UndecidedOneToOneFactTypeMappings, newlyDecidedFactTypeMappings, deeplyMappedObjectTypes, 0);
EliminateInvalidPermutations(chain, nonPreferredFunctionalObjectTypesCache);
FindSmallestPermutationsInTermsOfConceptTypes(chain, permutationStateHelper);
#if FALSE
// UNDONE: See notes on EliminatePermutationsWithIdenticalResults
EliminatePermutationsWithIdenticalResults(chain);
#endif // FALSE
// Add each mapping from the optimal permutation to the "global" set of decided mappings.
foreach (FactTypeMapping optimalMapping in ChooseOptimalPermutation(chain).Mappings)
{
allDecidedMappings.Add(optimalMapping.FactType, optimalMapping);
}
// Clear the set of object types that have some deep mapping away from them (they will be different for the next chain).
deeplyMappedObjectTypes.Clear();
}
}
private static bool IsBlockedDeepMapping(FactTypeMappingList mappings, int currentMappingIndex, Dictionary<ObjectType, bool> nonPreferredFuntionalObjectTypes)
{
FactTypeMapping mapping = mappings[currentMappingIndex];
ObjectType towards;
if (mapping.MappingDepth == MappingDepth.Deep && !ObjectTypePlaysNonIdentifierFunctionalRoles((towards = mapping.TowardsObjectType), nonPreferredFuntionalObjectTypes))
{
int mappingsCount = mappings.Count;
int j = 1;
for (; j < mappingsCount; ++j)
{
int testIndex = (j + currentMappingIndex) % mappingsCount;
FactTypeMapping testMapping = mappings[testIndex];
if (testMapping.MappingDepth == MappingDepth.Deep && testMapping.FromObjectType == towards && !IsBlockedDeepMapping(mappings, testIndex, nonPreferredFuntionalObjectTypes))
{
break;
}
}
if (j == mappingsCount)
{
return true;
}
}
return false;
}
/// <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;
}
}
}
}
public Permutation(FactTypeMappingList mappings)
{
myMappings = mappings;
}