Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebParts / PersonalizationStateInfoCollection.cs / 2 / PersonalizationStateInfoCollection.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls.WebParts { using System; using System.Collections; using System.Collections.Generic; using System.Security.Permissions; using System.Web.Util; [Serializable] [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class PersonalizationStateInfoCollection : ICollection { private Dictionary_indices; private bool _readOnly; // Tried to use the generic type List instead, but it's readonly // implementation returns a different type that is not assignable to List . // That would require to maintain two different fields, one for the readonly // collection when set and one for the modifiable collection version. // // So, the cleaner solution is to use ArrayList, though it might have a // slightly slower perf because of explicit casting. private ArrayList _values; public PersonalizationStateInfoCollection() { _indices = new Dictionary (KeyComparer.Default); _values = new ArrayList(); } public int Count { get { return _values.Count; } } public PersonalizationStateInfo this[string path, string username] { get { if (path == null) { throw new ArgumentNullException("path"); } Key key = new Key(path, username); int index; if (!_indices.TryGetValue(key, out index)) { return null; } return (PersonalizationStateInfo) _values[index]; } } public PersonalizationStateInfo this[int index] { get { return (PersonalizationStateInfo) _values[index]; } } public void Add(PersonalizationStateInfo data) { if (data == null) { throw new ArgumentNullException("data"); } Key key; UserPersonalizationStateInfo userData = data as UserPersonalizationStateInfo; if (userData != null) { key = new Key(userData.Path, userData.Username); } else { key = new Key(data.Path, null); } // VSWhidbey 376063: avoid key duplicate, we check here first before we add. if (_indices.ContainsKey(key)) { if (userData != null) { throw new ArgumentException(SR.GetString( SR.PersonalizationStateInfoCollection_CouldNotAddUserStateInfo, key.Path, key.Username)); } else { throw new ArgumentException(SR.GetString( SR.PersonalizationStateInfoCollection_CouldNotAddSharedStateInfo, key.Path)); } } int pos = _values.Add(data); try { _indices.Add(key, pos); } catch { // Roll back the first addition to make the whole addition atomic _values.RemoveAt(pos); throw; } } public void Clear() { _values.Clear(); _indices.Clear(); } public void CopyTo(PersonalizationStateInfo[] array, int index) { _values.CopyTo(array, index); } public IEnumerator GetEnumerator() { return _values.GetEnumerator(); } public bool IsSynchronized { get { return false; } } public void Remove(string path, string username) { if (path == null) { throw new ArgumentNullException("path"); } Key key = new Key(path, username); int ipos; if (!_indices.TryGetValue(key, out ipos)) { return; } Debug.Assert(ipos >= 0 && ipos < _values.Count); _indices.Remove(key); try { _values.RemoveAt(ipos); } catch { // Roll back the first addition to make the whole addition atomic _indices.Add(key, ipos); throw; } // Readjust the values' indices by -1 where the indices are greater than the removed index ArrayList al = new ArrayList(); foreach(KeyValuePair de in _indices) { if (de.Value > ipos) { al.Add(de.Key); } } foreach (Key k in al) { _indices[k] = ((int) _indices[k]) - 1; } } public void SetReadOnly() { if (_readOnly) { return; } _readOnly = true; _values = ArrayList.ReadOnly(_values); } public object SyncRoot { get { return this; } } void ICollection.CopyTo(Array array, int index) { _values.CopyTo(array, index); } [Serializable] private sealed class Key { public string Path; public string Username; internal Key(string path, string username) { Debug.Assert(path != null); Path = path; Username = username; } } [Serializable] private sealed class KeyComparer : IEqualityComparer { internal static readonly IEqualityComparer Default = new KeyComparer(); bool IEqualityComparer .Equals(Key x, Key y) { return (Compare(x, y) == 0); } int IEqualityComparer .GetHashCode(Key key) { if (key == null) { return 0; } Debug.Assert(key.Path != null); int pathHashCode = key.Path.ToLowerInvariant().GetHashCode(); int usernameHashCode = 0; if (key.Username != null) { usernameHashCode = key.Username.ToLowerInvariant().GetHashCode(); } return HashCodeCombiner.CombineHashCodes(pathHashCode, usernameHashCode); } private int Compare(Key x, Key y) { if (x == null && y == null) { return 0; } if (x == null) { return -1; } if (y == null) { return 1; } int pathDiff = String.Compare(x.Path, y.Path, StringComparison.OrdinalIgnoreCase); if (pathDiff != 0) { return pathDiff; } else { return String.Compare(x.Username, y.Username, StringComparison.OrdinalIgnoreCase); } } } } }
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