add IComparable and tostring/gethashcode to PocketItem

PocketSharp/Models/PocketItem.cs

@@ -14,8 +14,7 @@ namespace PocketSharp.Models
   [JsonObject]
   [ImplementPropertyChanged]
   [DebuggerDisplay("Uri = {Uri}, Title = {Title}")]
-
-  public class PocketItem
+  public class PocketItem : IComparable
   {
     /// <summary>
     /// Gets or sets the ID.
@@ -374,5 +373,114 @@ namespace PocketSharp.Models
     /// </value>
     [JsonIgnore]
     public string Json { get; set; }
+
+    /// <summary>
+    /// Compares the current instance with another object of the same type and returns an integer that indicates whether the current instance precedes, follows, or occurs in the same position in the sort order as the other object.
+    /// </summary>
+    /// <param name="obj">An object to compare with this instance.</param>
+    /// <returns>
+    /// A value that indicates the relative order of the objects being compared. The return value has these meanings: Value Meaning Less than zero This instance precedes <paramref name="obj" /> in the sort order. Zero This instance occurs in the same position in the sort order as <paramref name="obj" />. Greater than zero This instance follows <paramref name="obj" /> in the sort order.
+    /// </returns>
+    int IComparable.CompareTo(object obj)
+    {
+      PocketItem item = (PocketItem)obj;
+
+      if (!AddTime.HasValue)
+      {
+        return 1;
+      }
+      if (!item.AddTime.HasValue)
+      {
+        return -1;
+      }
+
+      return DateTime.Compare(AddTime.Value, item.AddTime.Value);
+    }
+
+    /// <summary>
+    /// Determines whether the specified <see cref="System.Object" />, is equal to this instance.
+    /// </summary>
+    /// <param name="obj">The <see cref="System.Object" /> to compare with this instance.</param>
+    /// <returns>
+    ///   <c>true</c> if the specified <see cref="System.Object" /> is equal to this instance; otherwise, <c>false</c>.
+    /// </returns>
+    public override bool Equals(object obj)
+    {
+      if (obj == null)
+      {
+        return false;
+      }
+
+      PocketItem item = (PocketItem)obj;
+
+      if ((Object)item == null)
+      {
+        return false;
+      }
+
+      return ID == item.ID;
+    }
+
+
+    /// <summary>
+    /// Implements the operator ==.
+    /// </summary>
+    /// <param name="a">A.</param>
+    /// <param name="b">The b.</param>
+    /// <returns>
+    /// The result of the operator.
+    /// </returns>
+    public static bool operator ==(PocketItem a, PocketItem b)
+    {
+      if (a == null || b == null)
+      {
+        return false;
+      }
+
+      PocketItem itemA = (PocketItem)a;
+      PocketItem itemB = (PocketItem)b;
+
+      if ((Object)itemA == null || (Object)itemB == null)
+      {
+        return false;
+      }
+
+      return itemA.ID == itemB.ID;
+    }
+
+    /// <summary>
+    /// Implements the operator !=.
+    /// </summary>
+    /// <param name="a">A.</param>
+    /// <param name="b">The b.</param>
+    /// <returns>
+    /// The result of the operator.
+    /// </returns>
+    public static bool operator !=(PocketItem a, PocketItem b)
+    {
+      return !(a == b);
+    }
+
+    /// <summary>
+    /// Returns a hash code for this instance.
+    /// </summary>
+    /// <returns>
+    /// A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table. 
+    /// </returns>
+    public override int GetHashCode()
+    {
+      return ID.GetHashCode();
+    }
+
+    /// <summary>
+    /// Returns a <see cref="System.String" /> that represents this instance.
+    /// </summary>
+    /// <returns>
+    /// A <see cref="System.String" /> that represents this instance.
+    /// </returns>
+    public override string ToString()
+    {
+      return ID;
+    }
   }
 }