/// <summary>
/// Creates if necessary the base type and update the base type list of the specified type
/// </summary>
/// <param name="baseTypeName">Base type name to create and add</param>
/// <param name="type">The type whose base type list needs updating</param>
/// <param name="isExistingType">Whether the type is a new type or existent one</param>
private void AddBaseTypeOfType(string baseTypeName, ContentTypeImpl type, bool isExistingType)
{
if (baseTypeName != null)
{
string uppercaseBaseTypeName = baseTypeName.ToUpperInvariant();
// no content type can derive from unknown
// Do this check before GetOrCreateContentType because it provides a more meaningful exception message
if (baseTypeName == ContentTypeRegistryImpl.UnknownContentTypeName)
{
throw new InvalidOperationException(String.Format(System.Globalization.CultureInfo.CurrentUICulture,
Strings.ContentTypeRegistry_ContentTypesCannotDeriveFromUnknown, type.TypeName));
}
// Get existing or create new base content type if any base type is specified
ContentTypeImpl baseType;
bool isExistingBaseType = GetOrCreateContentType(baseTypeName, out baseType);
// Only a new mapping between two existing nodes can introduce a cycle in the graph.
if (isExistingType && isExistingBaseType && this.CausesCycle(type, baseType))
{
throw new InvalidOperationException(String.Format(System.Globalization.CultureInfo.CurrentUICulture, Strings.ContentTypeRegistry_CausesCycles, baseType.TypeName, type.TypeName));
}
if (!isExistingBaseType)
{
this.contentTypes.Add(uppercaseBaseTypeName, baseType);
}
type.AddBaseType(baseType);
}
}
/// <summary>
/// Creates and adds a new content type with the specified name, or returns the existing type
/// </summary>
/// <param name="typeName"></param>
/// <param name="type">The type created or existent</param>
/// <returns>true if the type already existed</returns>
private bool GetOrCreateContentType(string typeName, out ContentTypeImpl type)
{
// Get existing or create new content type
if (string.IsNullOrEmpty(typeName))
{
throw new ArgumentException(Strings.ContentTypeRegistry_CannotAddTypeWithEmptyTypeName);
}
string uppercaseTypeName = typeName.ToUpperInvariant();
// no one can produce another unknown content type
if (uppercaseTypeName == ContentTypeRegistryImpl.UnknownContentTypeName)
{
throw new InvalidOperationException(Strings.ContentTypeRegistry_CannotProduceAnotherUnknownType);
}
bool isExistingType = this.contentTypes.TryGetValue(uppercaseTypeName, out type);
if (!isExistingType)
{
type = new ContentTypeImpl(typeName);
}
return(isExistingType);
}
internal void AddBaseType(ContentTypeImpl baseType)
{
// TODO: should be part of ctor; this class should be invariant
if (!this.BaseTypeList.Contains(baseType))
{
this.BaseTypeList.Add(baseType);
}
}
public IContentType GetContentType(string typeName)
{
Requires.NotNullOrWhiteSpace(typeName, nameof(typeName));
this.BuildContentTypes();
ContentTypeImpl contentType = null;
this.maps.NameToContentTypeMap.TryGetValue(typeName, out contentType);
return(contentType);
}
public IContentType GetContentType(string typeName)
{
ContentTypeImpl contentType = null;
lock (this.syncLock)
{
this.BuildContentTypes();
this.contentTypes.TryGetValue(typeName.ToUpperInvariant(), out contentType);
}
return(contentType);
}
public IContentType GetContentType(string typeName)
{
if (string.IsNullOrWhiteSpace(typeName))
{
throw new ArgumentException(nameof(typeName));
}
this.BuildContentTypes();
ContentTypeImpl contentType = null;
this.maps.NameToContentTypeMap.TryGetValue(typeName, out contentType);
return(contentType);
}
public IContentType GetContentTypeForFileName(string fileName)
{
if (fileName == null)
{
throw new ArgumentNullException(nameof(fileName));
}
this.BuildContentTypes();
ContentTypeImpl contentType = null;
this.maps.FileNameToContentTypeMap.TryGetValue(fileName, out contentType);
// TODO: should we return null if contentType is null?
return(contentType ?? ContentTypeRegistryImpl.UnknownContentTypeImpl);
}
public IContentType GetContentTypeForExtension(string extension)
{
if (extension == null)
{
throw new ArgumentNullException(nameof(extension));
}
this.BuildContentTypes();
ContentTypeImpl contentType = null;
this.maps.FileExtensionToContentTypeMap.TryGetValue(RemoveExtensionDot(extension), out contentType);
// TODO: should we return null if contentType is null?
return(contentType ?? ContentTypeRegistryImpl.UnknownContentTypeImpl);
}
public void RemoveContentType(string typeName)
{
lock (this.syncLock)
{
// Make sure first the content type map is built
BuildContentTypes();
}
// Since file extension registry will call back the content type registry when it gets initialized,
// make sure we force the initialization before obtaining the lock. This will guarantee we won't deadlock
// when we'll ask the registered extension later, after we obtained the content types lock
FileExtensionRegistry.GetContentTypeForExtension("");
string uppercaseTypeName = typeName.ToUpperInvariant();
lock (this.syncLock)
{
ContentTypeImpl type = null;
if (!this.contentTypes.TryGetValue(uppercaseTypeName, out type))
{
// If the type was not registered, removal is successful
return;
}
// Check if the type to be removed is not the Unknown content type
if (uppercaseTypeName == ContentTypeRegistryImpl.UnknownContentTypeName)
{
throw new InvalidOperationException(Strings.ContentTypeRegistry_CannotRemoveTheUnknownType);
}
// Check if the type is base type for another registered type
ContentTypeImpl derivedType;
if (IsBaseType(type, out derivedType))
{
throw new InvalidOperationException(String.Format(System.Globalization.CultureInfo.CurrentUICulture, Strings.ContentTypeRegistry_CannotRemoveBaseType, type.TypeName, derivedType.TypeName));
}
// If there are file extensions using this content type we won't allow removing it
IEnumerable <string> extensions = FileExtensionRegistry.GetExtensionsForContentType(type);
if (extensions != null && extensions.GetEnumerator().MoveNext())
{
throw new InvalidOperationException(String.Format(System.Globalization.CultureInfo.CurrentUICulture, Strings.ContentTypeRegistry_CannotRemoveTypeUsedByFileExtensions, type.TypeName));
}
// Remove the content type
this.contentTypes.Remove(uppercaseTypeName);
}
}
public IContentType GetContentTypeForFileName(string fileName)
{
ContentTypeImpl contentType = null;
if (string.IsNullOrWhiteSpace(fileName))
{
if (fileName == null)
{
throw new ArgumentNullException(nameof(fileName));
}
}
else
{
this.BuildContentTypes();
this.maps.FileNameToContentTypeMap.TryGetValue(fileName, out contentType);
}
return(contentType ?? ContentTypeRegistryImpl.UnknownContentTypeImpl);
}
public IContentType GetContentTypeForExtension(string extension)
{
ContentTypeImpl contentType = null;
if (string.IsNullOrEmpty(extension))
{
if (extension == null)
{
throw new ArgumentNullException(nameof(extension));
}
}
else
{
this.BuildContentTypes();
this.maps.FileExtensionToContentTypeMap.TryGetValue(RemoveExtensionDot(extension), out contentType);
}
return(contentType ?? ContentTypeRegistryImpl.UnknownContentTypeImpl);
}
internal static ContentTypeImpl AddContentTypeFromMetadata(string contentTypeName, string mimeType, IEnumerable <string> baseTypes,
IDictionary <string, ContentTypeImpl> nameToContentTypeBuilder,
IDictionary <string, ContentTypeImpl> mimeTypeToContentTypeBuilder)
{
if (!string.IsNullOrEmpty(contentTypeName))
{
ContentTypeImpl type;
if (!nameToContentTypeBuilder.TryGetValue(contentTypeName, out type))
{
bool addToMimeTypeMap = false;
if (string.IsNullOrWhiteSpace(mimeType))
{
mimeType = MimePrefix + contentTypeName.ToLowerInvariant();
}
else if (mimeTypeToContentTypeBuilder.ContainsKey(mimeType))
{
mimeType = null;
}
else
{
addToMimeTypeMap = true;
}
type = new ContentTypeImpl(contentTypeName, mimeType, baseTypes);
nameToContentTypeBuilder.Add(contentTypeName, type);
if (addToMimeTypeMap)
{
mimeTypeToContentTypeBuilder.Add(mimeType, type);
}
}
else
{
type.AddUnprocessedBaseTypes(baseTypes);
}
return(type);
}
return(null);
}
/// <summary>
/// Checks whether the specified type is base type for another content type
/// </summary>
/// <param name="typeToCheck">The type to check for being a base type</param>
/// <param name="derivedType">An out parameter to receive the first discovered derived type</param>
/// <returns><c>True</c> if the given <paramref name="typeToCheck"/> content type is a base type</returns>
private bool IsBaseType(ContentTypeImpl typeToCheck, out ContentTypeImpl derivedType)
{
derivedType = null;
foreach (ContentTypeImpl type in this.maps.NameToContentTypeMap.Values)
{
if (type != typeToCheck)
{
foreach (IContentType baseType in type.BaseTypes)
{
if (baseType == typeToCheck)
{
derivedType = type;
return(true);
}
}
}
}
return(false);
}
public IContentType GetContentTypeForMimeType(string mimeType)
{
Requires.NotNullOrWhiteSpace(mimeType, nameof(mimeType));
this.BuildContentTypes();
ContentTypeImpl contentType = null;
if (!this.maps.MimeTypeToContentTypeMap.TryGetValue(mimeType, out contentType))
{
if (mimeType.StartsWith(BaseMimePrefix, StringComparison.Ordinal))
{
if (!(mimeType.StartsWith(MimePrefix, StringComparison.Ordinal) && this.maps.NameToContentTypeMap.TryGetValue(mimeType.Substring(MimePrefix.Length), out contentType)))
{
this.maps.NameToContentTypeMap.TryGetValue(mimeType.Substring(BaseMimePrefix.Length), out contentType);
}
}
}
return(contentType);
}
/// <summary>
/// Checks whether the specified type is base type for another content type
/// </summary>
/// <param name="typeToCheck">The type to check for being a base type</param>
/// <param name="derivedType">An out parameter to receive the first discovered derived type</param>
/// <returns><c>True</c> if the given <paramref name="typeToCheck"/> content type is a base type</returns>
private bool IsBaseType(ContentTypeImpl typeToCheck, out ContentTypeImpl derivedType)
{
derivedType = null;
foreach (ContentTypeImpl type in contentTypes.Values)
{
if (type != typeToCheck)
{
foreach (IContentType baseType in type.BaseTypes)
{
if (String.Compare(baseType.TypeName, typeToCheck.TypeName, StringComparison.OrdinalIgnoreCase) == 0)
{
derivedType = type;
return(true);
}
}
}
}
return(false);
}
public IContentType GetContentTypeForMimeType(string mimeType)
{
if (string.IsNullOrWhiteSpace(mimeType))
{
throw new ArgumentException(nameof(mimeType));
}
this.BuildContentTypes();
ContentTypeImpl contentType = null;
if (!this.maps.MimeTypeToContentTypeMap.TryGetValue(mimeType, out contentType))
{
if (mimeType.StartsWith(BaseMimePrefix))
{
if (!(mimeType.StartsWith(MimePrefix) && this.maps.NameToContentTypeMap.TryGetValue(mimeType.Substring(MimePrefix.Length), out contentType)))
{
this.maps.NameToContentTypeMap.TryGetValue(mimeType.Substring(BaseMimePrefix.Length), out contentType);
}
}
}
return(contentType);
}
