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using System.Collections.Generic;
namespace System.ComponentModel.DataAnnotations {
/// <summary>
/// Used to mark an Entity member as an association
/// </summary>
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
public sealed class AssociationAttribute : Attribute {
private string name;
private string thisKey;
private string otherKey;
private bool isForeignKey;
/// <summary>
/// Full form of constructor
/// </summary>
/// <param name="name">The name of the association. For bi-directional associations, the name must
/// be the same on both sides of the association</param>
/// <param name="thisKey">Comma separated list of the property names of the key values
/// on this side of the association</param>
/// <param name="otherKey">Comma separated list of the property names of the key values
/// on the other side of the association</param>
public AssociationAttribute(string name, string thisKey, string otherKey) {
this.name = name;
this.thisKey = thisKey;
this.otherKey = otherKey;
}
/// <summary>
/// Gets the name of the association. For bi-directional associations, the name must
/// be the same on both sides of the association
/// </summary>
public string Name {
get { return this.name; }
}
/// <summary>
/// Gets a comma separated list of the property names of the key values
/// on this side of the association
/// </summary>
public string ThisKey {
get {
return this.thisKey;
}
}
/// <summary>
/// Gets a comma separated list of the property names of the key values
/// on the other side of the association
/// </summary>
public string OtherKey {
get {
return this.otherKey;
}
}
/// <summary>
/// Gets or sets a value indicating whether this association member represents the foreign key
/// side of an association
/// </summary>
public bool IsForeignKey {
get {
return this.isForeignKey;
}
set {
this.isForeignKey = value;
}
}
/// <summary>
/// Gets the collection of individual key members specified in the ThisKey string.
/// </summary>
public IEnumerable<string> ThisKeyMembers {
get {
return GetKeyMembers(this.ThisKey);
}
}
/// <summary>
/// Gets the collection of individual key members specified in the OtherKey string.
/// </summary>
public IEnumerable<string> OtherKeyMembers {
get {
return GetKeyMembers(this.OtherKey);
}
}
/// <summary>
/// Parses the comma delimited key specified
/// </summary>
/// <param name="key">The key to parse</param>
/// <returns>Array of individual key members</returns>
private static string[] GetKeyMembers(string key) {
return key.Replace(" ", string.Empty).Split(',');
}
}
}
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