//
// AssociationAttribute.cs
//
// Authors:
// Marek Habersack <mhabersack@novell.com>
//
// Copyright (C) 2010 Novell Inc. (http://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.
//
#if NET_4_0
using System;
using System.Collections.Generic;
namespace System.ComponentModel.DataAnnotations{
[AttributeUsage (AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false, Inherited = true)]
public sealed class AssociationAttribute : Attribute
{
static readonly char[] keySplitChars = { ',' };
IEnumerable <string> otherKeyMembers;
IEnumerable <string> thisKeyMembers;
public bool IsForeignKey { get; set; }
public string Name { get; private set; }
public string OtherKey { get; private set; }
public IEnumerable<string> OtherKeyMembers {
get {
if (otherKeyMembers == null)
otherKeyMembers = GetKeyMembers (OtherKey);
return otherKeyMembers;
}
}
public string ThisKey { get; private set; }
public IEnumerable<string> ThisKeyMembers {
get {
if (thisKeyMembers == null)
thisKeyMembers = GetKeyMembers (ThisKey);
return thisKeyMembers;
}
}
public AssociationAttribute (string name, string thisKey, string otherKey)
{
this.Name = name;
this.ThisKey = thisKey;
this.OtherKey = otherKey;
}
IEnumerable <string> GetKeyMembers (string key)
{
// .NET emulation
if (key == null)
throw new NullReferenceException (".NET emulation");
string nows = key.Replace (" ", String.Empty);
if (nows.Length == 0)
return new string[] { String.Empty };
return nows.Split (keySplitChars);
}
}
}
#endif
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