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//
// System.Web.UI.StateManagedCollection
//
// Authors:
// Ben Maurer (bmaurer@users.sourceforge.net)
//
// (C) 2003 Ben Maurer
//
//
// 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.
//
#if NET_2_0
using System.Collections;
using System.Collections.Specialized;
using System.Text;
namespace System.Web.UI {
public abstract class StateManagedCollection : IList, IStateManager {
protected abstract object CreateKnownType (int index);
protected abstract void SetDirtyObject (object o);
protected virtual Type [] GetKnownTypes ()
{
return null;
}
#region OnXXX
protected virtual void OnClear ()
{
}
protected virtual void OnClearComplete ()
{
}
protected virtual void OnInsert (int index, object value)
{
}
protected virtual void OnInsertComplete (int index, object value)
{
}
protected virtual void OnRemove (int index, object value)
{
}
protected virtual void OnRemoveComplete (int index, object value)
{
}
protected virtual void OnValidate (object value)
{
if (value == null)
throw new ArgumentNullException ("value");
}
#endregion
#region IStateManager
void IStateManager.LoadViewState (object savedState)
{
int pos = -1;
foreach (Pair p in (ArrayList)savedState) {
pos ++;
if (p == null)
continue;
IStateManager itm;
if (p.Second is Type)
itm = (IStateManager) Activator.CreateInstance ((Type) p.Second);
else
itm = (IStateManager) CreateKnownType ((int) p.Second);
itm.LoadViewState (p.First);
if (pos >= Count)
items.Add (itm);
else
items [pos] = itm;
}
}
object IStateManager.SaveViewState ()
{
ArrayList saved = new ArrayList ();
Type [] knownTypes = GetKnownTypes ();
foreach (IStateManager itm in items) {
object state = itm.SaveViewState ();
if (state == null && !saveEverything) {
saved.Add (null);
continue;
}
Pair p = new Pair ();
p.First = state;
Type t = itm.GetType ();
int idx = -1;
if (knownTypes != null)
idx = Array.IndexOf (knownTypes, t);
if (idx != -1)
p.Second = idx;
else
p.Second = t;
saved.Add (p);
}
return saved;
}
void IStateManager.TrackViewState ()
{
isTrackingViewState = true;
foreach (IStateManager i in items)
i.TrackViewState ();
}
bool isTrackingViewState;
bool IStateManager.IsTrackingViewState {
get { return isTrackingViewState; }
}
#endregion
#region ICollection, IList, IEnumerable
public void Clear ()
{
this.OnClear ();
items.Clear ();
this.OnClearComplete ();
SetSaveEverything ();
}
public int IndexOf (object o)
{
if (o == null)
return -1;
return items.IndexOf (o);
}
public bool Contains (object o)
{
return o != null && items.Contains (o);
}
public IEnumerator GetEnumerator ()
{
return items.GetEnumerator ();
}
void System.Collections.ICollection.CopyTo (Array array, int index)
{
items.CopyTo (array, index);
}
IEnumerator IEnumerable.GetEnumerator ()
{
return GetEnumerator ();
}
int IList.Add (object value)
{
OnValidate(value);
if (isTrackingViewState) {
((IStateManager) value).TrackViewState ();
SetDirtyObject (value);
}
OnInsert (-1, value);
items.Add (value);
OnInsertComplete (-1, value);
return Count - 1;
}
void IList.Insert (int index, object value)
{
OnValidate(value);
if (isTrackingViewState) {
((IStateManager) value).TrackViewState ();
SetDirtyObject (value);
}
OnInsert (index, value);
items.Insert (index, value);
OnInsertComplete(index, value);
SetSaveEverything ();
}
void IList.Remove (object value)
{
if (value == null)
return;
OnValidate (value);
((IList)this).RemoveAt (IndexOf (value));
}
void IList.RemoveAt (int index)
{
object o = items [index];
OnRemove (index, o);
items.RemoveAt (index);
OnRemoveComplete(index, o);
SetSaveEverything ();
}
void IList.Clear ()
{
this.Clear ();
}
bool IList.Contains (object value)
{
if (value == null)
return false;
OnValidate (value);
return Contains (value);
}
int IList.IndexOf (object value)
{
if (value == null)
return -1;
OnValidate (value);
return IndexOf (value);
}
public int Count {
get { return items.Count; }
}
int ICollection.Count {
get { return items.Count; }
}
bool ICollection.IsSynchronized {
get { return false; }
}
object ICollection.SyncRoot {
get { return this; }
}
bool IList.IsFixedSize {
get { return false; }
}
bool IList.IsReadOnly {
get { return false; }
}
object IList.this [int index] {
get { return items [index]; }
set {
if (index < 0 || index >= Count)
throw new ArgumentOutOfRangeException ("index");
OnValidate (value);
if (isTrackingViewState) {
((IStateManager) value).TrackViewState ();
SetDirtyObject (value);
}
items [index] = value;
}
}
#endregion
ArrayList items = new ArrayList ();
bool saveEverything = false;
void SetSaveEverything ()
{
if (isTrackingViewState)
saveEverything = true;
}
}
}
#endif
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