Initial commit of PropertyComparer

ICD.Common.Utils/Comparers/PropertyComparer.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+
+namespace ICD.Common.Utils.Comparers
+{
+	public sealed class PropertyComparer<TParent, TProperty> : IComparer<TParent>
+	{
+		private readonly IComparer<TProperty> m_Comparer;
+		private readonly Func<TParent, TProperty> m_GetProperty;
+
+		/// <summary>
+		/// Constructor.
+		/// </summary>
+		/// <param name="comparer"></param>
+		/// <param name="getProperty"></param>
+		public PropertyComparer(IComparer<TProperty> comparer, Func<TParent, TProperty> getProperty)
+		{
+			m_Comparer = comparer;
+			m_GetProperty = getProperty;
+		}
+
+		public int Compare(TParent x, TParent y)
+		{
+			TProperty a = m_GetProperty(x);
+			TProperty b = m_GetProperty(y);
+
+			return m_Comparer.Compare(a, b);
+		}
+	}
+}

ICD.Common.Utils/Comparers/PropertyEqualityComparer.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+
+namespace ICD.Common.Utils.Comparers
+{
+	/// <summary>
+	/// Allows for comparing items based on some property.
+	/// </summary>
+	/// <typeparam name="TParent"></typeparam>
+	/// <typeparam name="TProperty"></typeparam>
+	public sealed class PropertyEqualityComparer<TParent, TProperty> : IEqualityComparer<TParent>
+	{
+		private readonly IEqualityComparer<TProperty> m_Comparer;
+		private readonly Func<TParent, TProperty> m_GetProperty;
+
+		/// <summary>
+		/// Constructor.
+		/// </summary>
+		/// <param name="comparer"></param>
+		/// <param name="getProperty"></param>
+		public PropertyEqualityComparer(IEqualityComparer<TProperty> comparer, Func<TParent, TProperty> getProperty)
+		{
+			m_Comparer = comparer;
+			m_GetProperty = getProperty;
+		}
+
+		public bool Equals(TParent x, TParent y)
+		{
+			TProperty a = m_GetProperty(x);
+			TProperty b = m_GetProperty(y);
+
+			return m_Comparer.Equals(a, b);
+		}
+
+		public int GetHashCode(TParent parent)
+		{
+			TProperty property = m_GetProperty(parent);
+			return m_Comparer.GetHashCode(property);
+		}
+	}
+}