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//
// System.ComponentModel.Design.Serialization.MemberRelationshipService
//
// Authors:
// Ivan N. Zlatev (contact@i-nZ.net)
//
// (C) 2007 Ivan N. Zlatev
//
// 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;
using System.CodeDom;
using System.ComponentModel;
using System.Collections;
namespace System.ComponentModel.Design.Serialization
{
public abstract class MemberRelationshipService
{
// MSDN: The default implementation stores relationships in a dictionary using weak references
// so the relationship table does not keep objects alive.
//
private class MemberRelationshipWeakEntry
{
private WeakReference _ownerWeakRef;
private MemberDescriptor _member;
public MemberRelationshipWeakEntry (MemberRelationship relation)
{
_ownerWeakRef = new WeakReference (relation.Owner);
_member = relation.Member;
}
public object Owner {
get {
if (_ownerWeakRef.IsAlive)
return _ownerWeakRef.Target;
return null;
}
}
public MemberDescriptor Member {
get { return _member; }
}
public static bool operator == (MemberRelationshipWeakEntry left, MemberRelationshipWeakEntry right)
{
if (left.Owner == right.Owner && left.Member == right.Member)
return true;
else
return false;
}
public static bool operator != (MemberRelationshipWeakEntry left, MemberRelationshipWeakEntry right)
{
return !(left == right);
}
public override int GetHashCode ()
{
if (this.Owner != null && _member != null)
return _member.GetHashCode () ^ _ownerWeakRef.Target.GetHashCode ();
return base.GetHashCode ();
}
public override bool Equals (object o)
{
if (o is MemberRelationshipWeakEntry) {
return ((MemberRelationshipWeakEntry) o) == this;
}
return false;
}
}
private Hashtable _relations;
protected MemberRelationshipService ()
{
_relations = new Hashtable ();
}
public abstract bool SupportsRelationship (MemberRelationship source, MemberRelationship relationship);
protected virtual MemberRelationship GetRelationship (MemberRelationship source)
{
if (source.IsEmpty)
throw new ArgumentNullException ("source");
MemberRelationshipWeakEntry entry = _relations[new MemberRelationshipWeakEntry (source)] as MemberRelationshipWeakEntry;
if (entry != null)
return new MemberRelationship (entry.Owner, entry.Member);
return MemberRelationship.Empty;
}
protected virtual void SetRelationship (MemberRelationship source, MemberRelationship relationship)
{
if (source.IsEmpty)
throw new ArgumentNullException ("source");
if (!relationship.IsEmpty && !this.SupportsRelationship (source, relationship))
throw new ArgumentException ("Relationship not supported.");
_relations[new MemberRelationshipWeakEntry (source)] = new MemberRelationshipWeakEntry (relationship);
}
public MemberRelationship this [object owner, MemberDescriptor member] {
get { return GetRelationship (new MemberRelationship (owner, member)); }
set { SetRelationship (new MemberRelationship (owner, member), value); }
}
public MemberRelationship this [MemberRelationship source] {
get { return GetRelationship (source); }
set { SetRelationship (source, value); }
}
}
}
#endif
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