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//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
//
// This file contain implementations details that are subject to change without notice.
// Use at your own risk.
//
using System;
using System.Collections.Generic;
using System.Diagnostics;
namespace Microsoft.VisualStudio.Utilities.Implementation
{
internal partial class ContentTypeImpl : IContentType
{
private readonly string name;
private readonly static ContentTypeImpl[] emptyBaseTypes = Array.Empty<ContentTypeImpl>();
private ContentTypeImpl[] baseTypeList = emptyBaseTypes;
internal ContentTypeImpl(string name, string mimeType = null, IEnumerable<string> baseTypes = null)
{
this.name = name;
this.MimeType = mimeType;
this.UnprocessedBaseTypes = baseTypes;
}
public string TypeName
{
get { return this.name; }
}
public string DisplayName
{
get { return this.name; }
}
public string MimeType { get; }
public bool IsOfType(string type)
{
if (string.Compare(type, this.name, StringComparison.OrdinalIgnoreCase) == 0)
{
return true;
}
else
{
for (int i = 0; i < this.baseTypeList.Length; i++)
{
if (this.baseTypeList[i].IsOfType(type))
{
return true;
}
}
}
return false;
}
public IEnumerable<IContentType> BaseTypes
{
get { return this.baseTypeList; }
}
public override string ToString()
{
return this.name;
}
internal void ProcessBaseTypes(IDictionary<string, ContentTypeImpl> nameToContentTypeBuilder,
IDictionary<string, ContentTypeImpl> mimeTypeToContentTypeBuilder)
{
if (this.UnprocessedBaseTypes != null)
{
List<ContentTypeImpl> newBaseTypes = new List<ContentTypeImpl>();
foreach (var baseTypeName in this.UnprocessedBaseTypes)
{
// The expectation is that the base type will already exists but (if it doesn't) add a stub for it (& the ctor for a stub base type leaves it in a state
// where the basetypes/state are set appropriately).
var baseType = ContentTypeRegistryImpl.AddContentTypeFromMetadata(baseTypeName, /* mime type */null, /* base types */null, nameToContentTypeBuilder, mimeTypeToContentTypeBuilder);
if (baseType == ContentTypeRegistryImpl.UnknownContentTypeImpl)
{
throw new InvalidOperationException(String.Format(System.Globalization.CultureInfo.CurrentUICulture,
Strings.ContentTypeRegistry_ContentTypesCannotDeriveFromUnknown, this.TypeName));
}
if (!newBaseTypes.Contains(baseType))
newBaseTypes.Add(baseType);
}
if (newBaseTypes.Count > 0)
{
this.baseTypeList = newBaseTypes.ToArray();
this.state = VisitState.NotVisited;
}
else
{
Debug.Assert(object.ReferenceEquals(this.baseTypeList, emptyBaseTypes));
}
this.UnprocessedBaseTypes = null;
}
}
// used internally for cycle detection
internal enum VisitState
{
NotVisited = 0, // The node hasn't been visited yet
Visiting, // The node (or one of its children) is being visited
Visited // The node and its children have been visited before
}
private VisitState state = VisitState.Visited;
internal bool CheckForCycle(bool breakCycle)
{
try
{
if (this.baseTypeList.Length != 0)
{
this.state = VisitState.Visiting;
foreach (var baseType in this.baseTypeList)
{
if (baseType.state == VisitState.Visiting)
{
if (breakCycle)
{
// There is a cycle of this -> basetype -> ... -> this
// Don't try a surgical fix: simply break the cycle the easiest way possible
// since this is an error in the definitions that shouldn't happen.
// TODO: log the error.
this.baseTypeList = emptyBaseTypes;
}
return true;
}
else if ((baseType.state == VisitState.NotVisited) && baseType.CheckForCycle(breakCycle))
{
return true;
}
}
}
}
finally
{
this.state = VisitState.Visited;
}
return false;
}
// used internally when building up content types
internal void AddUnprocessedBaseTypes(IEnumerable<string> newBaseTypes)
{
if (newBaseTypes != null)
{
if (object.ReferenceEquals(this.UnprocessedBaseTypes, emptyBaseTypes))
{
this.UnprocessedBaseTypes = newBaseTypes;
}
else
{
var allBaseTypes = new List<string>(this.UnprocessedBaseTypes);
allBaseTypes.AddRange(newBaseTypes);
this.UnprocessedBaseTypes = allBaseTypes;
}
}
}
internal IEnumerable<string> UnprocessedBaseTypes;
#if DEBUG
internal bool IsProcessed
{
get
{
return (this.UnprocessedBaseTypes == null) && (this.baseTypeList != null) &&
((this.baseTypeList.Length == 0)
? (object.ReferenceEquals(this.baseTypeList, ContentTypeImpl.emptyBaseTypes) && (this.state == VisitState.Visited))
: (this.state == VisitState.NotVisited));
}
}
internal bool IsCheckedForCycles
{
get { return (this.state == VisitState.Visited) && (this.UnprocessedBaseTypes == null) && (object.ReferenceEquals(this.baseTypeList, ContentTypeImpl.emptyBaseTypes) || (this.baseTypeList.Length > 0)); }
}
#endif
}
}
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