107 lines
4.3 KiB
C#
107 lines
4.3 KiB
C#
using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Data.Linq.Mapping;
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using System.Linq;
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using System.Reflection;
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using System.Diagnostics;
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using System.Collections.Specialized;
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using System.Collections;
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using System.Globalization;
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namespace System.Web.DynamicData.ModelProviders {
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internal sealed class DLinqAssociationProvider : AssociationProvider {
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public DLinqAssociationProvider(DLinqColumnProvider column) {
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FromColumn = column;
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MetaAssociation association = column.Member.Association;
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SetOtherEndOfAssociation(association);
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SetDirection(association);
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Debug.Assert(Direction != AssociationDirection.ManyToMany, "Many to Many is not supported by Linq to SQL");
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SetAssociationKeyInfo(association);
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}
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private void SetAssociationKeyInfo(MetaAssociation association) {
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DLinqColumnProvider column = (DLinqColumnProvider)FromColumn;
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List<string> foreignKeyNames = new List<string>();
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int count = column.Member.Association.ThisKey.Count;
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for (int i = 0; i < count; i++) {
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MetaDataMember thisKeyMetaDataMember = column.Member.Association.ThisKey[i];
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MetaDataMember otherKeyMetaDataMember = column.Member.Association.OtherKey[i];
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DLinqColumnProvider thisEntityMemberComponent = FindColumn(column.Table, thisKeyMetaDataMember.Name);
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if (ShouldRemoveThisAssociation(association)) {
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column.ShouldRemove = true;
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return;
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}
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foreignKeyNames.Add(thisEntityMemberComponent.Name);
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if (thisEntityMemberComponent.IsPrimaryKey) {
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IsPrimaryKeyInThisTable = true;
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}
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if (association.IsForeignKey) {
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thisEntityMemberComponent.IsForeignKeyComponent = true;
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}
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}
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ForeignKeyNames = new ReadOnlyCollection<string>(foreignKeyNames);
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}
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private bool ShouldRemoveThisAssociation(MetaAssociation association) {
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if (Direction == AssociationDirection.ManyToOne && !association.OtherKeyIsPrimaryKey) {
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return true;
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}
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if (Direction == AssociationDirection.OneToMany && !association.ThisKeyIsPrimaryKey) {
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return true;
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}
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if (Direction == AssociationDirection.OneToOne) {
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if (!association.IsForeignKey && !association.ThisKeyIsPrimaryKey) {
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return true;
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}
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if (association.IsForeignKey && !association.OtherKeyIsPrimaryKey) {
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return true;
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}
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}
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return false;
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}
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private void SetOtherEndOfAssociation(MetaAssociation association) {
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DLinqTableProvider entityMemberParentEntity = (DLinqTableProvider)FromColumn.Table;
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DLinqDataModelProvider parentEntityDataContext = (DLinqDataModelProvider)entityMemberParentEntity.DataModel;
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if (association.OtherMember != null) {
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ToColumn = parentEntityDataContext.ColumnLookup[(PropertyInfo)association.OtherMember.Member];
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} else {
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ToTable = ((DLinqDataModelProvider)FromColumn.Table.DataModel).DLinqTables.Single(tp => tp.EntityType == association.OtherType.Type);
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}
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}
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private static DLinqColumnProvider FindColumn(TableProvider table, String columnName) {
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//
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return (DLinqColumnProvider)table.Columns.First(member => member.Name.Equals(columnName));
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}
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private void SetDirection(MetaAssociation association) {
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if (association.IsMany) {
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Direction = AssociationDirection.OneToMany;
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} else if (association.OtherMember == null || association.OtherMember.Association.IsMany) {
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// there might not be the other member if this is a one-sided association
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Direction = AssociationDirection.ManyToOne;
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} else {
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Direction = AssociationDirection.OneToOne;
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}
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}
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public override string GetSortExpression(ColumnProvider sortColumn) {
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return GetSortExpression(sortColumn, "{0}.{1}");
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}
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}
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}
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