/// <summary>
/// Handler for the using element
/// </summary>
/// <param name="reader"></param>
private void HandleUsingElement(XmlReader reader)
{
UsingElement referencedNamespace = new UsingElement(this);
referencedNamespace.Parse(reader);
AliasResolver.Add(referencedNamespace);
}
/// <summary>
/// Add a ReferenceSchema to the table
/// </summary>
/// <param name="refSchema">the ReferenceSchema to add</param>
public void Add(UsingElement usingElement)
{
Debug.Assert(usingElement != null, "usingElement parameter is null");
string newNamespace = usingElement.NamespaceName;
string newAlias = usingElement.Alias;
// Check whether the alias is a reserved keyword
if (CheckForSystemNamespace(usingElement, newAlias, NameKind.Alias))
{
newAlias = null;
}
//Check whether the namespace is a reserved keyword
if (CheckForSystemNamespace(usingElement, newNamespace, NameKind.Namespace))
{
newNamespace = null;
}
// see if the alias has already been used
if (newAlias != null && _aliasToNamespaceMap.ContainsKey(newAlias))
{
// it has, issue an error and make sure we don't try to add it
usingElement.AddError(ErrorCode.AlreadyDefined, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.AliasNameIsAlreadyDefined(newAlias));
newAlias = null;
}
// If there's an alias, add it.
// Its okay if they add the same namespace twice, until they have different alias
if (newAlias != null)
{
_aliasToNamespaceMap.Add(newAlias, newNamespace);
_usingElementCollection.Add(usingElement);
}
}
/// <summary>
/// Add a ReferenceSchema to the table
/// </summary>
/// <param name="refSchema">the ReferenceSchema to add</param>
public void Add(UsingElement usingElement)
{
Debug.Assert(usingElement != null, "usingElement parameter is null");
string newNamespace = usingElement.NamespaceName;
string newAlias = usingElement.Alias;
// Check whether the alias is a reserved keyword
if (CheckForSystemNamespace(usingElement, newAlias, NameKind.Alias))
{
newAlias = null;
}
//Check whether the namespace is a reserved keyword
if (CheckForSystemNamespace(usingElement, newNamespace, NameKind.Namespace))
{
newNamespace = null;
}
// see if the alias has already been used
if (newAlias != null && _aliasToNamespaceMap.ContainsKey(newAlias))
{
// it has, issue an error and make sure we don't try to add it
usingElement.AddError(ErrorCode.AlreadyDefined, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.AliasNameIsAlreadyDefined(newAlias));
newAlias = null;
}
// If there's an alias, add it.
// Its okay if they add the same namespace twice, until they have different alias
if (newAlias != null)
{
_aliasToNamespaceMap.Add(newAlias, newNamespace);
_usingElementCollection.Add(usingElement);
}
}
/// <summary>
/// Check if the given name is a reserved keyword. if yes, add appropriate error to the refschema
/// </summary>
/// <param name="refSchema"></param>
/// <param name="name"></param>
/// <param name="nameKind"></param>
/// <returns></returns>
private bool CheckForSystemNamespace(UsingElement refSchema, string name, NameKind nameKind)
{
Debug.Assert(_definingSchema.ProviderManifest != null, "Since we don't allow using elements in provider manifest, provider manifest can never be null");
// We need to check for system namespace
if (EdmItemCollection.IsSystemNamespace(_definingSchema.ProviderManifest, name))
{
if (nameKind == NameKind.Alias)
{
refSchema.AddError(ErrorCode.CannotUseSystemNamespaceAsAlias, EdmSchemaErrorSeverity.Error,
System.Data.Entity.Strings.CannotUseSystemNamespaceAsAlias(name));
}
else
{
refSchema.AddError(ErrorCode.NeedNotUseSystemNamespaceInUsing, EdmSchemaErrorSeverity.Error,
System.Data.Entity.Strings.NeedNotUseSystemNamespaceInUsing(name));
}
return(true);
}
return(false);
}
/// <summary>
/// Check if the given name is a reserved keyword. if yes, add appropriate error to the refschema
/// </summary>
/// <param name="refSchema"></param>
/// <param name="name"></param>
/// <param name="nameKind"></param>
/// <returns></returns>
private bool CheckForSystemNamespace(UsingElement refSchema, string name, NameKind nameKind)
{
Debug.Assert(
_definingSchema.ProviderManifest != null,
"Since we don't allow using elements in provider manifest, provider manifest can never be null");
// We need to check for system namespace
if (EdmItemCollection.IsSystemNamespace(_definingSchema.ProviderManifest, name))
{
if (nameKind == NameKind.Alias)
{
refSchema.AddError(
ErrorCode.CannotUseSystemNamespaceAsAlias, EdmSchemaErrorSeverity.Error,
Strings.CannotUseSystemNamespaceAsAlias(name));
}
else
{
refSchema.AddError(
ErrorCode.NeedNotUseSystemNamespaceInUsing, EdmSchemaErrorSeverity.Error,
Strings.NeedNotUseSystemNamespaceInUsing(name));
}
return true;
}
return false;
}
/// <summary>
/// Handler for the using element
/// </summary>
/// <param name="reader"></param>
private void HandleUsingElement(XmlReader reader)
{
UsingElement referencedNamespace = new UsingElement(this);
referencedNamespace.Parse(reader);
AliasResolver.Add(referencedNamespace);
}
