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//Copyright 2010 Microsoft Corporation
//
//Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
//You may obtain a copy of the License at
//
//http://www.apache.org/licenses/LICENSE-2.0
//
//Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
//"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and limitations under the License.
namespace System.Data.Services.Client
{
using System.Diagnostics;
[DebuggerDisplay("State = {state}")]
public sealed class LinkDescriptor : Descriptor
{
#region Fields
internal static readonly System.Collections.Generic.IEqualityComparer<LinkDescriptor> EquivalenceComparer = new Equivalent();
private object source;
private string sourceProperty;
private object target;
#endregion
internal LinkDescriptor(object source, string sourceProperty, object target)
: this(source, sourceProperty, target, EntityStates.Unchanged)
{
}
internal LinkDescriptor(object source, string sourceProperty, object target, EntityStates state)
: base(state)
{
this.source = source;
this.sourceProperty = sourceProperty;
this.target = target;
}
#region Public Properties
public object Target
{
get { return this.target; }
}
public object Source
{
get { return this.source; }
}
public string SourceProperty
{
get { return this.sourceProperty; }
}
#endregion
internal override bool IsResource
{
get { return false; }
}
internal bool IsEquivalent(object src, string srcPropName, object targ)
{
return (this.source == src &&
this.target == targ &&
this.sourceProperty == srcPropName);
}
private sealed class Equivalent : System.Collections.Generic.IEqualityComparer<LinkDescriptor>
{
public bool Equals(LinkDescriptor x, LinkDescriptor y)
{
return x.IsEquivalent(y.source, y.sourceProperty, y.target);
}
public int GetHashCode(LinkDescriptor obj)
{
return obj.Source.GetHashCode() ^ ((null != obj.Target) ? obj.Target.GetHashCode() : 0) ^ obj.SourceProperty.GetHashCode();
}
}
}
}
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