Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / internal / materialization / columnmapkeybuilder.cs / 1305376 / columnmapkeybuilder.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- using System.Collections.Generic; using System.Data.Metadata.Edm; using System.Data.Objects.ELinq; using System.Data.Objects.Internal; using System.Data.Query.InternalTrees; using System.Diagnostics; using System.Globalization; using System.Linq; using System.Text; namespace System.Data.Common.Internal.Materialization { ////// Supports building a unique key for a column map so that compiled delegates ( ///) /// can be cached. The general rule: if the cares about some property of /// the column map, the generated key must include that property value. /// /// IMPORTANT: /// The "X-" prefixes introduced in the different column map types should be unique. This avoids /// conflicts for different column maps with similar properties (e.g. ComplexType and EntityType) /// internal class ColumnMapKeyBuilder : ColumnMapVisitor{ #region private state private readonly StringBuilder _builder = new StringBuilder(); private readonly SpanIndex _spanIndex; #endregion #region constructor private ColumnMapKeyBuilder(SpanIndex spanIndex) { _spanIndex = spanIndex; } #endregion #region "public" surface area /// /// Returns a string uniquely identifying the given ColumnMap. /// internal static string GetColumnMapKey(ColumnMap columnMap, SpanIndex spanIndex) { ColumnMapKeyBuilder builder = new ColumnMapKeyBuilder(spanIndex); columnMap.Accept(builder, 0); return builder._builder.ToString(); } internal void Append(string value) { _builder.Append(value); } internal void Append(string prefix, Type type) { Append(prefix, type.AssemblyQualifiedName); } internal void Append(string prefix, TypeUsage type) { if (null != type) { // LINQ has anonymous types that aren't going to show up in our // metadata workspace, and we don't want to hydrate a record when // we need an anonymous type. LINQ solves this by annotating the // edmType with some additional information, which we'll pick up // here. InitializerMetadata initializer; if (InitializerMetadata.TryGetInitializerMetadata(type, out initializer)) { initializer.AppendColumnMapKey(this); } Append(prefix, type.EdmType); } } internal void Append(string prefix, EdmType type) { if (null != type) { Append(prefix, type.NamespaceName); Append(".", type.Name); if (type.BuiltInTypeKind == BuiltInTypeKind.RowType) { if (_spanIndex != null) { Append("<<"); DictionaryspanMap = _spanIndex.GetSpanMap((RowType)type); if (null != spanMap) { string separator = string.Empty; foreach (var pair in spanMap) { Append(separator); AppendValue("C", pair.Key); Append(":", pair.Value.DeclaringType); Append(".", pair.Value.Name); separator = ","; } } Append(">>"); } } } } #endregion #region helper methods private void Append(string prefix, string value) { Append(prefix); Append("'"); Append(value); Append("'"); } private void Append(string prefix, ColumnMap columnMap) { Append(prefix); Append("["); if (null != columnMap) { columnMap.Accept(this, 0); } Append("]"); } private void Append(string prefix, IEnumerable elements) { Append(prefix); Append("{"); if (null != elements) { string separator = string.Empty; foreach (ColumnMap element in elements) { Append(separator, element); separator = ","; } } Append("}"); } private void Append(string prefix, EntityIdentity entityIdentity) { Append(prefix); Append("["); Append(",K", entityIdentity.Keys); SimpleEntityIdentity simple = entityIdentity as SimpleEntityIdentity; if (null != simple) { Append(",", simple.EntitySet); } else { DiscriminatedEntityIdentity discriminated = (DiscriminatedEntityIdentity)entityIdentity; Append("CM", discriminated.EntitySetColumnMap); foreach (EntitySet entitySet in discriminated.EntitySetMap) { Append(",E", entitySet); } } Append("]"); } private void Append(string prefix, EntitySet entitySet) { if (null != entitySet) { Append(prefix, entitySet.EntityContainer.Name); Append(".", entitySet.Name); } } private void AppendValue(string prefix, object value) { Append(prefix, String.Format(CultureInfo.InvariantCulture, "{0}", value)); } #endregion #region visitor methods internal override void Visit(ComplexTypeColumnMap columnMap, int dummy) { Append("C-", columnMap.Type); Append(",N", columnMap.NullSentinel); Append(",P", columnMap.Properties); } internal override void Visit(DiscriminatedCollectionColumnMap columnMap, int dummy) { Append("DC-D", columnMap.Discriminator); AppendValue(",DV", columnMap.DiscriminatorValue); Append(",FK", columnMap.ForeignKeys); Append(",K", columnMap.Keys); Append(",E", columnMap.Element); } internal override void Visit(EntityColumnMap columnMap, int dummy) { Append("E-", columnMap.Type); Append(",N", columnMap.NullSentinel); Append(",P", columnMap.Properties); Append(",I", columnMap.EntityIdentity); } internal override void Visit(SimplePolymorphicColumnMap columnMap, int dummy) { Append("SP-", columnMap.Type); Append(",D", columnMap.TypeDiscriminator); Append(",N", columnMap.NullSentinel); Append(",P", columnMap.Properties); foreach (var typeChoice in columnMap.TypeChoices) { AppendValue(",K", typeChoice.Key); Append(":", typeChoice.Value); } } internal override void Visit(RecordColumnMap columnMap, int dummy) { Append("R-", columnMap.Type); Append(",N", columnMap.NullSentinel); Append(",P", columnMap.Properties); } internal override void Visit(RefColumnMap columnMap, int dummy) { Append("Ref-", columnMap.EntityIdentity); } internal override void Visit(ScalarColumnMap columnMap, int dummy) { String description = String.Format(CultureInfo.InvariantCulture, "S({0}-{1}:{2})", columnMap.CommandId, columnMap.ColumnPos, columnMap.Type.Identity); Append(description); } internal override void Visit(SimpleCollectionColumnMap columnMap, int dummy) { Append("DC-FK", columnMap.ForeignKeys); Append(",K", columnMap.Keys); Append(",E", columnMap.Element); } internal override void Visit(VarRefColumnMap columnMap, int dummy) { Debug.Fail("must not encounter VarRef in ColumnMap for key (eliminated in final ColumnMap)"); } internal override void Visit(MultipleDiscriminatorPolymorphicColumnMap columnMap, int dummy) { // MultipleDiscriminator maps contain an opaque discriminator delegate, so recompilation // is always required. Generate a unique key for the discriminator. // Append(String.Format(CultureInfo.InvariantCulture, "MD-{0}", Guid.NewGuid())); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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