/// <summary>
/// Finds the primary key field on a given entity type.
/// </summary>
/// <param name="entityType">Entity type to get the primary key field for.</param>
/// <param name="pkField">Field attribute for the found primary key. Will be null if no primary key is found and <paramref name="required">required</paramref> is set to false.</param>
/// <param name="pkProp">Property info for the property acting as the primary key. Will be null if no primary key is found and <paramref name="required">required</paramref> is set to false.</param>
/// <param name="required">If set to true, an exception will be thrown if no primary key field is found on the entity type.</param>
/// <exception cref="InvalidOperationException">
/// If more than one property is found with a primary key field attribute, or,
/// if <paramref name="required">required</paramref> is set and no primary key is found.
/// </exception>
internal static void FindPrimaryKey(Type entityType, out FieldAttribute pkField, out PropertyInfo pkProp, bool required)
{
Debug.Assert(entityType != null);
pkField = null;
pkProp = null;
//
// Find field attribute and corresponding property for the field with PrimaryKey attribute value set to true.
//
foreach (PropertyInfo property in entityType.GetProperties())
{
FieldAttribute field = Helpers.GetFieldAttribute(property);
if (field != null && field.PrimaryKey && field.FieldType == FieldType.Counter)
{
if (pkField != null)
{
throw RuntimeErrors.MoreThanOnePrimaryKey();
}
pkField = field;
pkProp = property;
break;
}
}
//
// Primary key field should be present in order to make the query.
//
if (required && (pkField == null || pkProp == null))
{
throw RuntimeErrors.MissingPrimaryKey();
}
}
/// <summary>
/// Executes the query and returns a single result of the specified type.
/// </summary>
/// <typeparam name="TResult">Type of the query result object.</typeparam>
/// <param name="expression">Expression representing the query.</param>
/// <returns>Singleton query result object.</returns>
public TResult Execute <TResult>(Expression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
//
// We expect a method call expression.
//
MethodCallExpression mc = expression as MethodCallExpression;
if (mc != null && mc.Method.DeclaringType == typeof(Queryable))
{
//
// First and FirstOrDefault query operators.
//
if (mc.Method.Name == "First" || mc.Method.Name == "FirstOrDefault")
{
//
// Execute the query. The parser will take care of the retrieval of only one item.
//
IEnumerator <TResult> res = _context.ExecuteQuery <TResult>(expression);
//
// Return the first element of the sequence, if it exists.
//
if (res.MoveNext())
{
return(res.Current);
}
//
// Empty sequence is valid for FirstOrDefault call. Return the default value of TResult.
//
else if (mc.Method.Name.EndsWith("OrDefault", StringComparison.Ordinal))
{
return(default(TResult));
}
//
// Empty sequence is invalid for First call.
//
else
{
throw RuntimeErrors.EmptySequence();
}
}
else
{
throw RuntimeErrors.UnsupportedQueryOperator(mc.Method.Name);
}
}
throw RuntimeErrors.FatalError();
}
/// <summary>
/// Creates a new Url instance based on a given URI and a description.
/// </summary>
/// <param name="address">URL to refer to.</param>
/// <param name="description">Description for the URL.</param>
public Url(string address, string description)
{
if (address == null)
{
throw new ArgumentNullException("address");
}
if (!Uri.IsWellFormedUriString(address, UriKind.Absolute))
{
throw RuntimeErrors.InvalidUriSpecified();
}
_address = address;
_description = description ?? "";
}
public UrlValue(string url, string description)
{
_urlValue = new SPFieldUrlValue();
if (url != null)
{
if (!Uri.IsWellFormedUriString(url, UriKind.Absolute))
{
throw RuntimeErrors.InvalidUriSpecified();
}
_urlValue.Url = url;
_urlValue.Description = description;
}
}
/// <summary>
/// Registers a list source object for the entity as specified by <typeparamref name="T">T</typeparamref>.
/// </summary>
/// <param name="list">List source to register.</param>
/// <typeparam name="T">Entity type to register the corresponding list source object for.</typeparam>
internal void RegisterList <T>(SharePointList <T> list) where T : class
{
Debug.Assert(list != null);
CheckDisposed();
Type t = typeof(T);
//
// The context can only hold one SharePointList<T> object for each type T.
//
if (_lists.ContainsKey(t))
{
throw RuntimeErrors.DuplicateSharePointListObject();
}
_lists.Add(t, list);
}
/// <summary>
/// Helper method to get the ListAttribute applied for the given entity type. An InvalidOperationException will be thrown if no ListAttribute is found.
/// </summary>
/// <param name="type">Type to get the ListAttribute for.</param>
/// <param name="throwExceptionIfMissing">Indicates whether or not to throw an exception if the list attribute is missing.</param>
/// <returns>ListAttribute applied on the entity object.</returns>
internal static ListAttribute GetListAttribute(Type type, bool throwExceptionIfMissing)
{
Debug.Assert(type != null);
ListAttribute[] la = type.GetCustomAttributes(typeof(ListAttribute), false) as ListAttribute[];
if (la != null && la.Length != 0)
{
return(la[0]);
}
else
{
if (throwExceptionIfMissing)
{
throw RuntimeErrors.MissingListAttribute();
}
else
{
return(null);
}
}
}
public static bool DateRangesOverlap(DateTime value, params DateTime?[] fields)
{
throw RuntimeErrors.CamlMethodsInvalidUse();
}
