/// <summary>
/// Create a new VarInfo for a structured type Var
/// </summary>
/// <param name="v">The structured type Var</param>
/// <param name="newType">"Mapped" type for v</param>
/// <param name="newVars">List of vars corresponding to v</param>
/// <param name="newProperties">Flattened Properties </param>
/// <param name="newVarsIncludeNullSentinelVar">Do the new vars include a var that represents a null sentinel either for this type or for any nested type</param>
/// <returns>the VarInfo</returns>
internal VarInfo CreateStructuredVarInfo(
Var v, RowType newType, List<Var> newVars, List<EdmProperty> newProperties, bool newVarsIncludeNullSentinelVar)
{
VarInfo varInfo = new StructuredVarInfo(newType, newVars, newProperties, newVarsIncludeNullSentinelVar);
m_map.Add(v, varInfo);
return varInfo;
}
/// <summary>
/// Create a new VarInfo for a structured type Var
/// </summary>
/// <param name="v">The structured type Var</param>
/// <param name="newType">"Mapped" type for v</param>
/// <param name="newVars">List of vars corresponding to v</param>
/// <param name="newProperties">Flattened Properties </param>
/// <param name="newVarsIncludeNullSentinelVar">Do the new vars include a var that represents a null sentinel either for this type or for any nested type</param>
/// <returns>the VarInfo</returns>
internal VarInfo CreateStructuredVarInfo(Var v, md.RowType newType, List <Var> newVars, List <md.EdmProperty> newProperties, bool newVarsIncludeNullSentinelVar)
{
VarInfo varInfo = new StructuredVarInfo(newType, newVars, newProperties, newVarsIncludeNullSentinelVar);
m_map.Add(v, varInfo);
return(varInfo);
}
private static bool TryGetCommonType(RowType rowType1, RowType rowType2, out EdmType commonRowType)
{
if (rowType1.Properties.Count != rowType2.Properties.Count ||
rowType1.InitializerMetadata != rowType2.InitializerMetadata)
{
commonRowType = null;
return(false);
}
// find a common type for every property
List <EdmProperty> commonProperties = new List <EdmProperty>();
for (int i = 0; i < rowType1.Properties.Count; i++)
{
TypeUsage columnCommonTypeUsage;
if (!TryGetCommonType(rowType1.Properties[i].TypeUsage, rowType2.Properties[i].TypeUsage, out columnCommonTypeUsage))
{
commonRowType = null;
return(false);
}
commonProperties.Add(new EdmProperty(rowType1.Properties[i].Name, columnCommonTypeUsage));
}
commonRowType = new RowType(commonProperties, rowType1.InitializerMetadata);
return(true);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="newType">new "flat" record type corresponding to the Var's datatype</param>
/// <param name="newVars">List of vars to replace current Var</param>
/// <param name="newTypeProperties">List of properties in the "flat" record type</param>
/// <param name="newVarsIncludeNullSentinelVar">Do the new vars include a var that represents a null sentinel either for this type or for any nested type</param>
internal StructuredVarInfo(md.RowType newType, List <Var> newVars, List <md.EdmProperty> newTypeProperties, bool newVarsIncludeNullSentinelVar)
{
PlanCompiler.Assert(newVars.Count == newTypeProperties.Count, "count mismatch");
// I see a few places where this is legal
// PlanCompiler.Assert(newVars.Count > 0, "0 vars?");
m_newVars = newVars;
m_newProperties = newTypeProperties;
m_newType = newType;
m_newVarsIncludeNullSentinelVar = newVarsIncludeNullSentinelVar;
m_newTypeUsage = md.TypeUsage.Create(newType);
}
internal StructuredVarInfo(
RowType newType, List<Var> newVars, List<EdmProperty> newTypeProperties, bool newVarsIncludeNullSentinelVar)
{
PlanCompiler.Assert(newVars.Count == newTypeProperties.Count, "count mismatch");
// I see a few places where this is legal
// PlanCompiler.Assert(newVars.Count > 0, "0 vars?");
m_newVars = newVars;
m_newProperties = newTypeProperties;
m_newType = newType;
m_newVarsIncludeNullSentinelVar = newVarsIncludeNullSentinelVar;
m_newTypeUsage = TypeUsage.Create(newType);
}
private static bool IsPromotableTo(RowType fromRowType, RowType toRowType)
{
Debug.Assert(fromRowType != null && toRowType != null);
if (fromRowType.Properties.Count != toRowType.Properties.Count)
{
return(false);
}
for (int i = 0; i < fromRowType.Properties.Count; i++)
{
if (!IsPromotableTo(fromRowType.Properties[i].TypeUsage, toRowType.Properties[i].TypeUsage))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Determines if the given edmType is equal comparable. Consult "EntitySql Language Specification",
/// section 7 - Comparison and Dependent Operations for details.
/// </summary>
/// <param name="edmType">an instance of an EdmType</param>
/// <returns>true if edmType is equal-comparable, false otherwise</returns>
private static bool IsEqualComparable(EdmType edmType)
{
if (Helper.IsPrimitiveType(edmType) || Helper.IsRefType(edmType) || Helper.IsEntityType(edmType) || Helper.IsEnumType(edmType))
{
return(true);
}
else if (Helper.IsRowType(edmType))
{
RowType rowType = (RowType)edmType;
foreach (EdmProperty rowProperty in rowType.Properties)
{
if (!IsEqualComparable(rowProperty.TypeUsage))
{
return(false);
}
}
return(true);
}
return(false);
}
/// <summary>
/// EdmEquals override verifying the equivalence of all members and their type usages.
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
internal override bool EdmEquals(MetadataItem item)
{
// short-circuit if this and other are reference equivalent
if (Object.ReferenceEquals(this, item))
{
return(true);
}
// check type of item
if (null == item || BuiltInTypeKind.RowType != item.BuiltInTypeKind)
{
return(false);
}
RowType other = (RowType)item;
// check each row type has the same number of members
if (this.Members.Count != other.Members.Count)
{
return(false);
}
// verify all members are equivalent
for (int ordinal = 0; ordinal < this.Members.Count; ordinal++)
{
EdmMember thisMember = this.Members[ordinal];
EdmMember otherMember = other.Members[ordinal];
// if members are different, return false
if (!thisMember.EdmEquals(otherMember) ||
!thisMember.TypeUsage.EdmEquals(otherMember.TypeUsage))
{
return(false);
}
}
return(true);
}
public void AddTvfReturnType(DbObjectKey key, RowType type)
{
_tvfReturnTypeLookup.Add(key, type);
}
/// <summary>
/// Determines the expected shape of store results. We expect a column for every property
/// of the mapped type (or types) and a column for every discriminator column. We make no
/// assumptions about the order of columns: the provider is expected to determine appropriate
/// types by looking at the names of the result columns, not the order of columns, which is
/// different from the typical handling of row types in the EF.
/// </summary>
/// <remarks>
/// Requires that the given function import mapping refers to a Collection(Entity) or Collection(ComplexType) CSDL
/// function.
/// </remarks>
/// <returns>Row type.</returns>
internal TypeUsage GetExpectedTargetResultType(MetadataWorkspace workspace, int resultSetIndex)
{
FunctionImportStructuralTypeMappingKB resultMapping = this.GetResultMapping(resultSetIndex);
// Collect all columns as name-type pairs.
Dictionary<string, TypeUsage> columns = new Dictionary<string, TypeUsage>();
// Figure out which entity types we expect to yield from the function.
IEnumerable<StructuralType> structuralTypes;
if (0 == resultMapping.NormalizedEntityTypeMappings.Count)
{
// No explicit type mappings; just use the type specified in the ReturnType attribute on the function.
StructuralType structuralType;
MetadataHelper.TryGetFunctionImportReturnType<StructuralType>(this.FunctionImport, resultSetIndex, out structuralType);
Debug.Assert(null != structuralType, "this method must be called only for entity/complextype reader function imports");
structuralTypes = new StructuralType[] { structuralType };
}
else
{
// Types are explicitly mapped.
structuralTypes = resultMapping.MappedEntityTypes.Cast<StructuralType>();
}
// Gather columns corresponding to all properties.
foreach (StructuralType structuralType in structuralTypes)
{
foreach (EdmProperty property in TypeHelpers.GetAllStructuralMembers(structuralType))
{
// NOTE: if a complex type is encountered, the column map generator will
// throw. For now, we just let them through.
// We expect to see each property multiple times, so we use indexer rather than
// .Add.
columns[property.Name] = property.TypeUsage;
}
}
// Gather discriminator columns.
foreach (string discriminatorColumn in this.GetDiscriminatorColumns(resultSetIndex))
{
if (!columns.ContainsKey(discriminatorColumn))
{
//
TypeUsage type = TypeUsage.CreateStringTypeUsage(workspace.GetModelPrimitiveType(PrimitiveTypeKind.String), true, false);
columns.Add(discriminatorColumn, type);
}
}
// Expected type is a collection of rows
RowType rowType = new RowType(columns.Select(c => new EdmProperty(c.Key, c.Value)));
TypeUsage result = TypeUsage.Create(new CollectionType(TypeUsage.Create(rowType)));
return result;
}
/// <summary>
/// Creates a record constructor
/// </summary>
/// <param name="type">Type metadata that specifies that record type to construct</param>
/// <returns>A new NewRecordOp with the specified result type</returns>
internal NewRecordOp CreateNewRecordOp(RowType type)
{
return new NewRecordOp(TypeUsage.Create(type));
}
/// <summary>
/// Create a new VarInfo for a structured type Var where the newVars cannot include a null sentinel
/// </summary>
/// <param name="v">The structured type Var</param>
/// <param name="newType">"Mapped" type for v</param>
/// <param name="newVars">List of vars corresponding to v</param>
/// <param name="newProperties">Flattened Properties </param>
internal VarInfo CreateStructuredVarInfo(Var v, RowType newType, List<Var> newVars, List<EdmProperty> newProperties)
{
return CreateStructuredVarInfo(v, newType, newVars, newProperties, false);
}
private static bool IsPromotableTo(RowType fromRowType, RowType toRowType)
{
Debug.Assert(fromRowType != null && toRowType != null);
if (fromRowType.Properties.Count != toRowType.Properties.Count)
{
return false;
}
for (int i = 0; i < fromRowType.Properties.Count; i++)
{
if (!IsPromotableTo(fromRowType.Properties[i].TypeUsage, toRowType.Properties[i].TypeUsage))
{
return false;
}
}
return true;
}
private DbExpression RewriteRow(DbExpression expression, RowType rowType)
{
DbLambdaExpression lambdaExpression = expression as DbLambdaExpression;
DbNewInstanceExpression newRow;
if (lambdaExpression != null)
{
// NOTE: We rely on the fact that today span cannot be done over queries containing DbLambdaExpressions
// created by users, because user-created expressions cannot be used for querying in O-space.
// If that were to change, pushing span beyond a LambdaExpression could cause variable name
// collisions between the variable names used in the Lambda and the names generated by the
// RelationshipNavigationVisitor.
newRow = lambdaExpression.Lambda.Body as DbNewInstanceExpression;
}
else
{
newRow = expression as DbNewInstanceExpression;
}
Dictionary<int, DbExpression> unmodifiedColumns = null;
Dictionary<int, DbExpression> spannedColumns = null;
for(int idx = 0; idx < rowType.Properties.Count; idx++)
{
// Retrieve the property that represents the current column
EdmProperty columnProp = rowType.Properties[idx];
// Construct an expression that defines the current column.
DbExpression columnExpr = null;
if(newRow != null)
{
// For a row-constructing NewInstance expression, the corresponding argument can simply be used
columnExpr = newRow.Arguments[idx];
}
else
{
// For all other expressions the property corresponding to the column name must be retrieved
// from the row-typed expression
columnExpr = expression.Property(columnProp.Name);
}
DbExpression spannedColumn = this.Rewrite(columnExpr);
if (!object.ReferenceEquals(spannedColumn, columnExpr))
{
// If so, then update the dictionary of column index to span information
if (null == spannedColumns)
{
spannedColumns = new Dictionary<int, DbExpression>();
}
spannedColumns[idx] = spannedColumn;
}
else
{
// Otherwise, update the dictionary of column index to unmodified expression
if(null == unmodifiedColumns)
{
unmodifiedColumns = new Dictionary<int, DbExpression>();
}
unmodifiedColumns[idx] = columnExpr;
}
}
// A new expression need only be built if at least one column was spanned
if(null == spannedColumns)
{
// No columns were spanned, indicate that the original expression should remain.
return expression;
}
else
{
// At least one column was spanned, so build a new row constructor that defines the new row, including spanned columns.
List<DbExpression> columnArguments = new List<DbExpression>(rowType.Properties.Count);
List<EdmProperty> properties = new List<EdmProperty>(rowType.Properties.Count);
for (int idx = 0; idx < rowType.Properties.Count; idx++)
{
EdmProperty columnProp = rowType.Properties[idx];
DbExpression columnDef = null;
if (!spannedColumns.TryGetValue(idx, out columnDef))
{
columnDef = unmodifiedColumns[idx];
}
columnArguments.Add(columnDef);
properties.Add(new EdmProperty(columnProp.Name, columnDef.ResultType));
}
// Copy over any eLinq initializer metadata (if present, or null if not).
// Note that this initializer metadata does not strictly match the new row type
// that includes spanned columns, but will be correct once the object materializer
// has interpreted the query results to produce the correct value for each colum.
RowType rewrittenRow = new RowType(properties, rowType.InitializerMetadata);
TypeUsage rewrittenRowTypeUsage = TypeUsage.Create(rewrittenRow);
DbExpression rewritten = rewrittenRowTypeUsage.New(columnArguments);
// SQLBUDT #554182: If we insert a new projection we should should make sure to
// not interfere with the nullability of the input.
// In particular, if the input row is null and we construct a new row as a projection over its columns
// we would get a row consisting of nulls, instead of a null row.
// Thus, given an input X, we rewritte it as: if (X is null) then NULL else rewritten.
if (newRow == null)
{
DbExpression condition = DbExpressionBuilder.CreateIsNullExpressionAllowingRowTypeArgument(expression);
DbExpression nullExpression = DbExpressionBuilder.Null(rewrittenRowTypeUsage);
rewritten = DbExpressionBuilder.Case(
new List<DbExpression>(new DbExpression[] { condition }),
new List<DbExpression>(new DbExpression[] { nullExpression }),
rewritten);
}
// Add an entry to the spanned row type => original row type map for the new row type.
AddSpannedRowType(rewrittenRow, expression.ResultType);
if (lambdaExpression != null && newRow != null)
{
rewritten = DbLambda.Create(rewritten, lambdaExpression.Lambda.Variables).Invoke(lambdaExpression.Arguments);
}
return rewritten;
}
}
private void AddSpannedRowType(RowType spannedType, TypeUsage originalType)
{
if (null == _spanIndex)
{
_spanIndex = new SpanIndex();
}
_spanIndex.AddSpannedRowType(spannedType, originalType);
}
private ComplexType CreateModelComplexTypeForTvfResult(LoadMethodSessionState session, string functionImportName, RowType tvfReturnType)
{
Debug.Assert(MetadataUtil.IsStoreType(tvfReturnType), "this is not a store type");
// create all the properties
List<EdmMember> members = new List<EdmMember>();
UniqueIdentifierService usedPropertyNames = new UniqueIdentifierService(false);
string name = CreateModelName(functionImportName + "_Result", session.UsedGlobalModelTypeNames);
// Don't want to have a property with the same name as the complex type
usedPropertyNames.RegisterUsedIdentifier(name);
foreach (EdmProperty storeProperty in tvfReturnType.Properties)
{
EdmProperty property = CreateModelProperty(session, storeProperty, usedPropertyNames);
members.Add(property);
}
var complexType = new ComplexType(name, _namespaceName, DataSpace.CSpace);
foreach (var m in members)
{
complexType.AddMember(m);
}
return complexType;
}
private DbNewInstanceExpression CreateNewRowExpression(List<KeyValuePair<string, DbExpression>> columns, InitializerMetadata initializerMetadata)
{
List<DbExpression> propertyValues = new List<DbExpression>(columns.Count);
List<EdmProperty> properties = new List<EdmProperty>(columns.Count);
for (int i = 0; i < columns.Count; i++)
{
var column = columns[i];
propertyValues.Add(column.Value);
properties.Add(new EdmProperty(column.Key, column.Value.ResultType));
}
RowType rowType = new RowType(properties, initializerMetadata);
TypeUsage typeUsage = TypeUsage.Create(rowType);
return typeUsage.New(propertyValues);
}
/// <summary>
/// Determines the expected shape of store results. We expect a column for every property
/// of the mapped type (or types) and a column for every discriminator column. We make no
/// assumptions about the order of columns: the provider is expected to determine appropriate
/// types by looking at the names of the result columns, not the order of columns, which is
/// different from the typical handling of row types in the EF.
/// </summary>
/// <remarks>
/// Requires that the given function import mapping refers to a Collection(Entity) or Collection(ComplexType) CSDL
/// function.
/// </remarks>
/// <returns>Row type.</returns>
internal TypeUsage GetExpectedTargetResultType(int resultSetIndex)
{
var resultMapping = GetResultMapping(resultSetIndex);
// Collect all columns as name-type pairs.
var columns = new Dictionary<string, TypeUsage>();
// Figure out which entity types we expect to yield from the function.
IEnumerable<StructuralType> structuralTypes;
if (0 == resultMapping.NormalizedEntityTypeMappings.Count)
{
// No explicit type mappings; just use the type specified in the ReturnType attribute on the function.
StructuralType structuralType;
MetadataHelper.TryGetFunctionImportReturnType(FunctionImport, resultSetIndex, out structuralType);
Debug.Assert(null != structuralType, "this method must be called only for entity/complextype reader function imports");
structuralTypes = new[] { structuralType };
}
else
{
// Types are explicitly mapped.
structuralTypes = resultMapping.MappedEntityTypes.Cast<StructuralType>();
}
// Gather columns corresponding to all properties.
foreach (var structuralType in structuralTypes)
{
foreach (EdmProperty property in TypeHelpers.GetAllStructuralMembers(structuralType))
{
// NOTE: if a complex type is encountered, the column map generator will
// throw. For now, we just let them through.
// We expect to see each property multiple times, so we use indexer rather than
// .Add.
columns[property.Name] = property.TypeUsage;
}
}
// Gather discriminator columns.
foreach (var discriminatorColumn in GetDiscriminatorColumns(resultSetIndex))
{
if (!columns.ContainsKey(discriminatorColumn))
{
// CONSIDER: we assume that discriminatorColumns are all string types. In practice,
// we're flexible about the runtime type during materialization, so the provider's
// decision is hopefully irrelevant. The alternative is to require typed stored
// procedure declarations in the SSDL, which is too much of a burden on the user and/or the
// tools (there is no reliable way of determining this metadata automatically from SQL
// Server).
var type = TypeUsage.CreateStringTypeUsage(
MetadataWorkspace.GetModelPrimitiveType(PrimitiveTypeKind.String), true, false);
columns.Add(discriminatorColumn, type);
}
}
// Expected type is a collection of rows
var rowType = new RowType(columns.Select(c => new EdmProperty(c.Key, c.Value)));
var result = TypeUsage.Create(new CollectionType(TypeUsage.Create(rowType)));
return result;
}
// Generates and caches a command definition for the given function
internal DbCommandDefinition GenerateCommandDefinition(StorageModificationFunctionMapping functionMapping)
{
if (null == m_modificationFunctionCommandDefinitions)
{
m_modificationFunctionCommandDefinitions = new Dictionary<StorageModificationFunctionMapping,DbCommandDefinition>();
}
DbCommandDefinition commandDefinition;
if (!m_modificationFunctionCommandDefinitions.TryGetValue(functionMapping, out commandDefinition))
{
// synthesize a RowType for this mapping
TypeUsage resultType = null;
if (null != functionMapping.ResultBindings && 0 < functionMapping.ResultBindings.Count)
{
List<EdmProperty> properties = new List<EdmProperty>(functionMapping.ResultBindings.Count);
foreach (StorageModificationFunctionResultBinding resultBinding in functionMapping.ResultBindings)
{
properties.Add(new EdmProperty(resultBinding.ColumnName, resultBinding.Property.TypeUsage));
}
RowType rowType = new RowType(properties);
CollectionType collectionType = new CollectionType(rowType);
resultType = TypeUsage.Create(collectionType);
}
// add function parameters
IEnumerable<KeyValuePair<string, TypeUsage>> functionParams =
functionMapping.Function.Parameters.Select(paramInfo => new KeyValuePair<string, TypeUsage>(paramInfo.Name, paramInfo.TypeUsage));
// construct DbFunctionCommandTree including implict return type
DbFunctionCommandTree tree = new DbFunctionCommandTree(m_metadataWorkspace, DataSpace.SSpace,
functionMapping.Function, resultType, functionParams);
commandDefinition = m_providerServices.CreateCommandDefinition(tree);
}
return commandDefinition;
}
/// <summary>Convert CSpace TypeMetadata into OSpace TypeMetadata</summary>
/// <param name="clrType"></param>
/// <returns>OSpace type metadata</returns>
private EdmType ConvertOSpaceToCSpaceType(EdmType clrType)
{
EdmType cdmType = null;
if (Helper.IsCollectionType(clrType))
{
EdmType elemType = ConvertOSpaceToCSpaceType(((CollectionType)clrType).TypeUsage.EdmType);
cdmType = new CollectionType(elemType);
}
else if (Helper.IsRowType(clrType))
{
List<EdmProperty> cdmProperties = new List<EdmProperty>();
foreach (EdmProperty column in ((RowType)clrType).Properties)
{
EdmType cdmPropertyType = ConvertOSpaceToCSpaceType(column.TypeUsage.EdmType);
EdmProperty cdmPorperty = new EdmProperty(column.Name, TypeUsage.Create(cdmPropertyType));
cdmProperties.Add(cdmPorperty);
}
cdmType = new RowType(cdmProperties, ((RowType)clrType).InitializerMetadata);
}
else if (Helper.IsRefType(clrType))
{
cdmType = new RefType((EntityType)(ConvertOSpaceToCSpaceType(((RefType)clrType).ElementType)));
}
else
{
cdmType = ((ObjectTypeMapping)GetMap(clrType)).EdmType;
}
Debug.Assert((null != cdmType), "null converted clr type");
return cdmType;
}
/// <summary>Convert CSpace TypeMetadata into OSpace TypeMetadata</summary>
/// <param name="cdmType"></param>
/// <returns>OSpace type metadata</returns>
private EdmType ConvertCSpaceToOSpaceType(EdmType cdmType)
{
EdmType clrType = null;
if (Helper.IsCollectionType(cdmType))
{
var elemType = ConvertCSpaceToOSpaceType(((CollectionType)cdmType).TypeUsage.EdmType);
clrType = new CollectionType(elemType);
}
else if (Helper.IsRowType(cdmType))
{
var clrProperties = new List<EdmProperty>();
var rowType = (RowType)cdmType;
foreach (var column in rowType.Properties)
{
var clrPropertyType = ConvertCSpaceToOSpaceType(column.TypeUsage.EdmType);
var clrProperty = new EdmProperty(column.Name, TypeUsage.Create(clrPropertyType));
clrProperties.Add(clrProperty);
}
clrType = new RowType(clrProperties, rowType.InitializerMetadata);
}
else if (Helper.IsRefType(cdmType))
{
clrType = new RefType((EntityType)ConvertCSpaceToOSpaceType(((RefType)cdmType).ElementType));
}
else if (Helper.IsPrimitiveType(cdmType))
{
clrType = m_objectCollection.GetMappedPrimitiveType(((PrimitiveType)cdmType).PrimitiveTypeKind);
}
else
{
clrType = ((ObjectTypeMapping)GetMap(cdmType)).ClrType;
}
Debug.Assert((null != clrType), "null converted clr type");
return clrType;
}
private void CreateTvfReturnRowType(
LoadMethodSessionState session,
IList<TableDetailsRow> columns,
ICollection<string> primaryKeys,
DbObjectType objectType,
List<EdmSchemaError> errors)
{
Debug.Assert(columns.Count != 0, "Trying to create a RowType with 0 properties");
Debug.Assert(primaryKeys != null, "primaryKeys != null");
DbObjectKey tableKey = columns[0].CreateDbObjectKey(objectType);
if (errors == null)
{
errors = new List<EdmSchemaError>();
}
IList<string> excludedColumns;
var properties = CreateEdmProperties(session, columns, tableKey, errors, out excludedColumns);
var rowType = new RowType(properties);
rowType.SetReadOnly();
session.AddTvfReturnType(tableKey, rowType);
if (rowType.Properties.Count == 0)
{
session.InvalidTypes.Add(rowType);
}
session.AddErrorsForType(rowType, errors);
}
/// <summary>
/// Create a new VarInfo for a structured type Var where the newVars cannot include a null sentinel
/// </summary>
/// <param name="v">The structured type Var</param>
/// <param name="newType">"Mapped" type for v</param>
/// <param name="newVars">List of vars corresponding to v</param>
/// <param name="newProperties">Flattened Properties </param>
internal VarInfo CreateStructuredVarInfo(Var v, md.RowType newType, List <Var> newVars, List <md.EdmProperty> newProperties)
{
return(CreateStructuredVarInfo(v, newType, newVars, newProperties, false));
}
private static bool CompareTypes(TypeUsage fromType, TypeUsage toType, bool equivalenceOnly)
{
Debug.Assert(fromType != null && toType != null);
// If the type usages are the same reference, they are equal.
if (object.ReferenceEquals(fromType, toType))
{
return(true);
}
if (fromType.EdmType.BuiltInTypeKind != toType.EdmType.BuiltInTypeKind)
{
return(false);
}
//
// Ensure structural evaluation for Collection, Ref and Row types
//
if (fromType.EdmType.BuiltInTypeKind == BuiltInTypeKind.CollectionType)
{
// Collection Type: Just compare the Element types
return(CompareTypes(((CollectionType)fromType.EdmType).TypeUsage,
((CollectionType)toType.EdmType).TypeUsage,
equivalenceOnly));
}
else if (fromType.EdmType.BuiltInTypeKind == BuiltInTypeKind.RefType)
{
// Both are Reference Types, so compare the referenced Entity types
return(((RefType)fromType.EdmType).ElementType.EdmEquals(((RefType)toType.EdmType).ElementType));
}
else if (fromType.EdmType.BuiltInTypeKind == BuiltInTypeKind.RowType)
{
// Row Types
RowType fromRow = (RowType)fromType.EdmType;
RowType toRow = (RowType)toType.EdmType;
// Both are RowTypes, so compare the structure.
// The number of properties must be the same.
if (fromRow.Properties.Count != toRow.Properties.Count)
{
return(false);
}
// Compare properties. For an equivalence comparison, only
// property types must match, otherwise names and types must match.
for (int idx = 0; idx < fromRow.Properties.Count; idx++)
{
EdmProperty fromProp = fromRow.Properties[idx];
EdmProperty toProp = toRow.Properties[idx];
if (!equivalenceOnly && (fromProp.Name != toProp.Name))
{
return(false);
}
if (!CompareTypes(fromProp.TypeUsage, toProp.TypeUsage, equivalenceOnly))
{
return(false);
}
}
return(true);
}
//
// compare non-transient type usages - simply compare the edm types instead
//
return(fromType.EdmType.EdmEquals(toType.EdmType));
}
/// <summary>
/// Returns a Model type usage for a provider type
/// </summary>
/// <returns>model (CSpace) type usage</returns>
internal TypeUsage GetModelTypeUsage()
{
if (_modelTypeUsage == null)
{
EdmType edmType = this.EdmType;
// If the edm type is already a cspace type, return the same type
if (edmType.DataSpace == DataSpace.CSpace || edmType.DataSpace == DataSpace.OSpace)
{
return(this);
}
TypeUsage result;
if (Helper.IsRowType(edmType))
{
RowType sspaceRowType = (RowType)edmType;
EdmProperty[] properties = new EdmProperty[sspaceRowType.Properties.Count];
for (int i = 0; i < properties.Length; i++)
{
EdmProperty sspaceProperty = sspaceRowType.Properties[i];
TypeUsage newTypeUsage = sspaceProperty.TypeUsage.GetModelTypeUsage();
properties[i] = new EdmProperty(sspaceProperty.Name, newTypeUsage);
}
RowType edmRowType = new RowType(properties, sspaceRowType.InitializerMetadata);
result = TypeUsage.Create(edmRowType, this.Facets);
}
else if (Helper.IsCollectionType(edmType))
{
CollectionType sspaceCollectionType = ((CollectionType)edmType);
TypeUsage newTypeUsage = sspaceCollectionType.TypeUsage.GetModelTypeUsage();
result = TypeUsage.Create(new CollectionType(newTypeUsage), this.Facets);
}
else if (Helper.IsRefType(edmType))
{
System.Diagnostics.Debug.Assert(((RefType)edmType).ElementType.DataSpace == DataSpace.CSpace);
result = this;
}
else if (Helper.IsPrimitiveType(edmType))
{
result = ((PrimitiveType)edmType).ProviderManifest.GetEdmType(this);
if (result == null)
{
throw EntityUtil.ProviderIncompatible(System.Data.Entity.Strings.Mapping_ProviderReturnsNullType(this.ToString()));
}
if (!TypeSemantics.IsNullable(this))
{
result = TypeUsage.Create(result.EdmType,
OverrideFacetValues(result.Facets,
new FacetValues {
Nullable = false
}));
}
}
else if (Helper.IsEntityTypeBase(edmType) || Helper.IsComplexType(edmType))
{
result = this;
}
else
{
System.Diagnostics.Debug.Assert(false, "Unexpected type found in entity data reader");
return(null);
}
System.Threading.Interlocked.CompareExchange(ref _modelTypeUsage, result, null);
}
return(_modelTypeUsage);
}
private static void VerifyRowTypeSupportedForComparison(Type clrType, RowType rowType, Stack<EdmMember> memberPath)
{
foreach (EdmMember member in rowType.Properties)
{
if (null == memberPath)
{
memberPath = new Stack<EdmMember>();
}
memberPath.Push(member);
VerifyTypeSupportedForComparison(clrType, member.TypeUsage, memberPath);
memberPath.Pop();
}
}
private void AddSpanMap(RowType rowType, Dictionary<int, AssociationEndMember> columnMap)
{
if (null == _spanIndex)
{
_spanIndex = new SpanIndex();
}
_spanIndex.AddSpanMap(rowType, columnMap);
}
/// <summary>
/// Requires: a public type with a public, default constructor. Returns a column map initializing the type
/// and all properties of the type with a public setter taking a primitive type and having a corresponding
/// column in the reader.
/// </summary>
internal static CollectionColumnMap CreateColumnMapFromReaderAndClrType(DbDataReader reader, Type type, MetadataWorkspace workspace)
{
Debug.Assert(null != reader);
Debug.Assert(null != type);
Debug.Assert(null != workspace);
// we require a default constructor
ConstructorInfo constructor = type.GetConstructor(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance,
null, Type.EmptyTypes, null);
if (type.IsAbstract || (null == constructor && !type.IsValueType))
{
throw EntityUtil.InvalidOperation(
Strings.ObjectContext_InvalidTypeForStoreQuery(type));
}
// build a LINQ expression used by result assembly to create results
var memberInfo = new List<Tuple<MemberAssignment, int, EdmProperty>>();
foreach (PropertyInfo prop in type.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance))
{
// for enums unwrap the type if nullable
var propertyUnderlyingType = Nullable.GetUnderlyingType(prop.PropertyType) ?? prop.PropertyType;
Type propType = propertyUnderlyingType.IsEnum ? propertyUnderlyingType.GetEnumUnderlyingType() : prop.PropertyType;
EdmType modelType;
int ordinal;
if (TryGetColumnOrdinalFromReader(reader, prop.Name, out ordinal) &&
MetadataHelper.TryDetermineCSpaceModelType(propType, workspace, out modelType) &&
(Helper.IsScalarType(modelType)) &&
prop.CanWrite && prop.GetIndexParameters().Length == 0 && null != prop.GetSetMethod(/* nonPublic */true))
{
memberInfo.Add(Tuple.Create(
Expression.Bind(prop, Expression.Parameter(prop.PropertyType, "placeholder")),
ordinal,
new EdmProperty(prop.Name, TypeUsage.Create(modelType))));
}
}
// initialize members in the order in which they appear in the reader
MemberInfo[] members = new MemberInfo[memberInfo.Count];
MemberBinding[] memberBindings = new MemberBinding[memberInfo.Count];
ColumnMap[] propertyMaps = new ColumnMap[memberInfo.Count];
EdmProperty[] modelProperties = new EdmProperty[memberInfo.Count];
int i = 0;
foreach (var memberGroup in memberInfo.GroupBy(tuple => tuple.Item2).OrderBy(tuple => tuple.Key))
{
// make sure that a single column isn't contributing to multiple properties
if (memberGroup.Count() != 1)
{
throw EntityUtil.InvalidOperation(Strings.ObjectContext_TwoPropertiesMappedToSameColumn(
reader.GetName(memberGroup.Key),
String.Join(", ", memberGroup.Select(tuple => tuple.Item3.Name).ToArray())));
}
var member = memberGroup.Single();
MemberAssignment assignment = member.Item1;
int ordinal = member.Item2;
EdmProperty modelProp = member.Item3;
members[i] = assignment.Member;
memberBindings[i] = assignment;
propertyMaps[i] = new ScalarColumnMap(modelProp.TypeUsage, modelProp.Name, 0, ordinal);
modelProperties[i] = modelProp;
i++;
}
NewExpression newExpr = null == constructor ? Expression.New(type) : Expression.New(constructor);
MemberInitExpression init = Expression.MemberInit(newExpr, memberBindings);
InitializerMetadata initMetadata = InitializerMetadata.CreateProjectionInitializer(
(EdmItemCollection)workspace.GetItemCollection(DataSpace.CSpace), init, members);
// column map (a collection of rows with InitializerMetadata markup)
RowType rowType = new RowType(modelProperties, initMetadata);
RecordColumnMap rowMap = new RecordColumnMap(TypeUsage.Create(rowType),
"DefaultTypeProjection", propertyMaps, null);
CollectionColumnMap collectionMap = new SimpleCollectionColumnMap(rowType.GetCollectionType().TypeUsage,
rowType.Name, rowMap, null, null);
return collectionMap;
}
internal override TypeUsage GetTypeUsage()
{
if (_typeUsage == null)
{
var listOfProperties = new List<EdmProperty>();
foreach (var property in _properties)
{
var edmProperty = new EdmProperty(property.FQName, property.GetTypeUsage());
edmProperty.AddMetadataProperties(property.OtherContent);
//edmProperty.DeclaringType
listOfProperties.Add(edmProperty);
}
RowType rowType = new RowType(listOfProperties);
if (Schema.DataModel == SchemaDataModelOption.EntityDataModel)
{
rowType.DataSpace = DataSpace.CSpace;
}
else
{
Debug.Assert(Schema.DataModel == SchemaDataModelOption.ProviderDataModel, "Only DataModel == SchemaDataModelOption.ProviderDataModel is expected");
rowType.DataSpace = DataSpace.SSpace;
}
rowType.AddMetadataProperties(this.OtherContent);
_typeUsage = TypeUsage.Create(rowType);
}
return _typeUsage;
}
/// <summary>
/// Create a "flat" table definition object (ie) the table has one column
/// for each property of the specified row type
/// </summary>
/// <param name="type">the shape of each row of the table</param>
/// <returns>the table definition</returns>
internal TableMD CreateFlatTableDefinition(RowType type)
{
return CreateFlatTableDefinition(type.Properties, new List<EdmMember>(), null);
}
private static bool TryGetCommonType(RowType rowType1, RowType rowType2, out EdmType commonRowType)
{
if (rowType1.Properties.Count != rowType2.Properties.Count ||
rowType1.InitializerMetadata != rowType2.InitializerMetadata)
{
commonRowType = null;
return false;
}
// find a common type for every property
List<EdmProperty> commonProperties = new List<EdmProperty>();
for (int i = 0; i < rowType1.Properties.Count; i++)
{
TypeUsage columnCommonTypeUsage;
if (!TryGetCommonType(rowType1.Properties[i].TypeUsage, rowType2.Properties[i].TypeUsage, out columnCommonTypeUsage))
{
commonRowType = null;
return false;
}
commonProperties.Add(new EdmProperty(rowType1.Properties[i].Name, columnCommonTypeUsage));
}
commonRowType = new RowType(commonProperties, rowType1.InitializerMetadata);
return true;
}
public bool TryGetTvfReturnType(DbObjectKey key, out RowType type)
{
return _tvfReturnTypeLookup.TryGetValue(key, out type);
}