internal void SetItem(int index, Object item)
{
Object[] aObj = null;
if (item == null)
{
RemoveItem(index);
return;
}
switch (m_cElt)
{
case 0:
// on the first item, we don't create an array, we merely remember it's index and value
// this this the 99% case
m_cElt = 1;
m_maxIndex = (short)index;
m_Obj = item;
break;
case 1:
// we have to decide if a 2nd item has indeed been added and create the array
// if it has
if (index == m_maxIndex)
{
// replacing the one existing item
m_Obj = item;
}
else
{
// adding a second distinct permission
Object objSaved = m_Obj;
int iMax = Math.Max(m_maxIndex, index);
aObj = new Object[iMax+1];
aObj[m_maxIndex] = objSaved;
aObj[index] = item;
m_maxIndex = (short)iMax;
m_cElt = 2;
m_Set = aObj;
m_Obj = null;
}
break;
default:
// this is the general case code for when there is really an array
aObj = m_Set;
// we are now adding an item, check if we need to grow
if (index >= aObj.Length)
{
Object[] newset = new Object[index+1];
System.Array.Copy(aObj, 0, newset, 0, m_maxIndex+1);
m_maxIndex = (short)index;
newset[index] = item;
m_Set = newset;
m_cElt++;
}
else
{
if (aObj[index] == null)
m_cElt++;
aObj[index] = item;
if (index > m_maxIndex)
m_maxIndex = (short)index;
}
break;
}
}
// Used to merge two distinct TokenBasedSets (used currently only in PermissionSet Deserialization)
internal TokenBasedSet SpecialUnion(TokenBasedSet other)
{
// This gets called from PermissionSet.OnDeserialized and it's possible that the TokenBasedSets have
// not been subjected to VTS callbacks yet
OnDeserializedInternal();
TokenBasedSet unionSet = new TokenBasedSet();
int maxMax;
if (other != null)
{
other.OnDeserializedInternal();
maxMax = this.GetMaxUsedIndex() > other.GetMaxUsedIndex() ? this.GetMaxUsedIndex() : other.GetMaxUsedIndex();
}
else
{
maxMax = this.GetMaxUsedIndex();
}
for (int i = 0; i <= maxMax; ++i)
{
Object thisObj = this.GetItem(i);
IPermission thisPerm = thisObj as IPermission;
Object otherObj = (other != null)?other.GetItem(i):null;
IPermission otherPerm = otherObj as IPermission;
if (thisObj == null && otherObj == null)
{
continue;
}
if (thisObj == null)
{
PermissionToken token = PermissionToken.GetToken(otherPerm);
if (token == null)
{
throw new SerializationException(Environment.GetResourceString("Serialization_InsufficientState"));
}
unionSet.SetItem(token.m_index, otherPerm);
}
else if (otherObj == null)
{
PermissionToken token = PermissionToken.GetToken(thisPerm);
if (token == null)
{
throw new SerializationException(Environment.GetResourceString("Serialization_InsufficientState"));
}
unionSet.SetItem(token.m_index, thisPerm);
}
else
{
Debug.Assert((thisObj == null || otherObj == null), "Permission cannot be in both TokenBasedSets");
}
}
return(unionSet);
}
