StateBag.cs :  » 2.6.4-mono-.net-core » System.Web » System » Web » UI » C# / CSharp Open Source

// 
// System.Web.UI.StateBag
//
// Author:
//        Ben Maurer <bmaurer@novell.com>
//
// Copyright (C) 2005-2010 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Collections;
using System.Collections.Specialized;
using System.Security.Permissions;

namespace System.Web.UI{
  // CAS - no InheritanceDemand here as the class is sealed
  [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  public sealed class StateBag : IDictionary, IStateManager
  {
    HybridDictionary ht;
    bool track;
    
    public StateBag (bool ignoreCase)
    {
      ht = new HybridDictionary (ignoreCase);
    }
  
    public StateBag () : this (false)
    {
    }

    void IStateManager.LoadViewState (object savedState)
    {
      LoadViewState (savedState);
    }

    object IStateManager.SaveViewState ()
    {
      return SaveViewState ();
    }
    
    
    void IStateManager.TrackViewState ()
    {
      TrackViewState ();
    }

    bool IStateManager.IsTrackingViewState {
      get {
        return track;
      }
    }
    
    internal bool IsTrackingViewState {
      get {
        return track;
      }
    }  

    
    internal void LoadViewState (object savedState)
    {
      if (savedState == null)
        return;
      
      foreach (DictionaryEntry de in (Hashtable) savedState)
        Add ((string) de.Key, de.Value);
    }
    
    internal object SaveViewState ()
    {
      Hashtable h = null;

      foreach (DictionaryEntry de in ht) {
        StateItem si = (StateItem) de.Value;
        if (si.IsDirty) {
          if (h == null)
            h = new Hashtable ();
          h.Add (de.Key, si.Value);
        }
      }

      return h;
    }
    
    internal void TrackViewState ()
    {
      track = true;
    }
  
    public StateItem Add (string key, object value)
    {
      StateItem si = ht [key] as StateItem;
      if (si == null)
        ht [key] = si = new StateItem (value);
      si.Value = value;
      si.IsDirty |= track;
      
      return si;
    }

    internal string GetString (string key, string def)
    {
      string s = (string) this [key];
      return s == null ? def : s;
    }
    
    internal bool GetBool (string key, bool def)
    {
      object o = this [key];
      return o == null ? def : (bool) o;
    }

    internal char GetChar (string key, char def)
    {
      object o = this [key];
      return o == null ? def : (char) o;
    }

    internal int GetInt (string key, int def)
    {
      object o = this [key];
      return o == null ? def : (int) o;
    }

    internal short GetShort (string key, short def)
    {
      object o = this [key];
      return o == null ? def : (short) o;
    }
    
    public void Clear ()
    {
      ht.Clear ();
    }
  
    public IDictionaryEnumerator GetEnumerator ()
    {
      return ht.GetEnumerator ();
    }

    IEnumerator IEnumerable.GetEnumerator ()
    {
      return GetEnumerator ();
    }
    
    public bool IsItemDirty (string key)
    {
      StateItem si = ht [key] as StateItem;
      return si != null && si.IsDirty;
    }
  
    public void Remove (string key)
    {
      ht.Remove (key);
    }
  
    public void SetItemDirty (string key, bool dirty) 
    {
      StateItem si = (StateItem) ht [key];
      if (si != null)
        si.IsDirty = dirty;
    }

    public int Count {
      get {
        return ht.Count;
      }
    }
  
    public object this [string key] {
      get {
        StateItem i = ht [key] as StateItem;
        if (i != null)
          return i.Value;
        return null;
      }
    
      set {
        if (value == null && ! IsTrackingViewState)
          Remove (key);
        else
          Add (key, value);
      }
    }
  
    public ICollection Keys {
      get {
        return ht.Keys;
      }
    
    }
  
    public ICollection Values {
      get {
        return ht.Values;
      }
    }

    void IDictionary.Add (object key, object value)
    {
      Add ((string) key, value);
    }
  
    void IDictionary.Remove (object key)
    {
      Remove ((string) key);
    }

    void ICollection.CopyTo (Array array, int index)
    {
      ht.CopyTo (array, index);
    }
  
    bool IDictionary.Contains (object key) 
    {
      return ht.Contains (key);
    }

    bool ICollection.IsSynchronized {
      get {
        return false;
      }
    }

    object ICollection.SyncRoot {
      get {
        return ht;
      }  
    }

    object IDictionary.this [object key] {
      get {
        return this [(string) key];
      }
    
      set {
        this [(string) key] = value;
      }
    }

    bool IDictionary.IsFixedSize {
      get {
        return false;
      }
    }
  
    bool IDictionary.IsReadOnly {
      get {
        return false;
      }
    }

    public void SetDirty (bool dirty)
    {
      foreach (DictionaryEntry de in ht) {
        StateItem si = (StateItem) de.Value;
        si.IsDirty = dirty;
      }
    }
  }
}