3 files changed, 178 insertions, 0 deletions
diff --git a/MediaBrowser.Model/Extensions/LinqExtensions.cs b/MediaBrowser.Model/Extensions/LinqExtensions.cs
new file mode 100644
index 000000000..09ace42e8
--- /dev/null
+++ b/MediaBrowser.Model/Extensions/LinqExtensions.cs
@@ -0,0 +1,97 @@
+using System;
+using System.Collections.Generic;
+
+namespace MediaBrowser.Model.Extensions
+{
+    // MoreLINQ - Extensions to LINQ to Objects
+    // Copyright (c) 2008 Jonathan Skeet. All rights reserved.
+    // 
+    // 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.
+
+    public static class LinqExtensions
+    {
+        /// <summary>
+        /// Returns all distinct elements of the given source, where "distinctness"
+        /// is determined via a projection and the default equality comparer for the projected type.
+        /// </summary>
+        /// <remarks>
+        /// This operator uses deferred execution and streams the results, although
+        /// a set of already-seen keys is retained. If a key is seen multiple times,
+        /// only the first element with that key is returned.
+        /// </remarks>
+        /// <typeparam name="TSource">Type of the source sequence</typeparam>
+        /// <typeparam name="TKey">Type of the projected element</typeparam>
+        /// <param name="source">Source sequence</param>
+        /// <param name="keySelector">Projection for determining "distinctness"</param>
+        /// <returns>A sequence consisting of distinct elements from the source sequence,
+        /// comparing them by the specified key projection.</returns>
+
+        public static IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source,
+            Func<TSource, TKey> keySelector)
+        {
+            return source.DistinctBy(keySelector, null);
+        }
+
+        public static TSource[] ToArray<TSource>(this IEnumerable<TSource> source, int count)
+        {
+            if (source == null) throw new ArgumentNullException("source");
+            if (count < 0) throw new ArgumentOutOfRangeException("count");
+            var array = new TSource[count];
+            int i = 0;
+            foreach (var item in source)
+            {
+                array[i++] = item;
+            }
+            return array;
+        }
+
+        /// <summary>
+        /// Returns all distinct elements of the given source, where "distinctness"
+        /// is determined via a projection and the specified comparer for the projected type.
+        /// </summary>
+        /// <remarks>
+        /// This operator uses deferred execution and streams the results, although
+        /// a set of already-seen keys is retained. If a key is seen multiple times,
+        /// only the first element with that key is returned.
+        /// </remarks>
+        /// <typeparam name="TSource">Type of the source sequence</typeparam>
+        /// <typeparam name="TKey">Type of the projected element</typeparam>
+        /// <param name="source">Source sequence</param>
+        /// <param name="keySelector">Projection for determining "distinctness"</param>
+        /// <param name="comparer">The equality comparer to use to determine whether or not keys are equal.
+        /// If null, the default equality comparer for <c>TSource</c> is used.</param>
+        /// <returns>A sequence consisting of distinct elements from the source sequence,
+        /// comparing them by the specified key projection.</returns>
+
+        public static IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source,
+            Func<TSource, TKey> keySelector, IEqualityComparer<TKey> comparer)
+        {
+            if (source == null) throw new ArgumentNullException("source");
+            if (keySelector == null) throw new ArgumentNullException("keySelector");
+            return DistinctByImpl(source, keySelector, comparer);
+        }
+
+        private static IEnumerable<TSource> DistinctByImpl<TSource, TKey>(IEnumerable<TSource> source,
+            Func<TSource, TKey> keySelector, IEqualityComparer<TKey> comparer)
+        {
+            var knownKeys = new HashSet<TKey>(comparer);
+            foreach (var element in source)
+            {
+                if (knownKeys.Add(keySelector(element)))
+                {
+                    yield return element;
+                }
+            }
+        }
+    }
+}
diff --git a/MediaBrowser.Model/Extensions/ListHelper.cs b/MediaBrowser.Model/Extensions/ListHelper.cs
new file mode 100644
index 000000000..243ae3105
--- /dev/null
+++ b/MediaBrowser.Model/Extensions/ListHelper.cs
@@ -0,0 +1,24 @@
+using System;
+
+namespace MediaBrowser.Model.Extensions
+{
+    public static class ListHelper
+    {
+        public static bool ContainsIgnoreCase(string[] list, string value)
+        {
+            if (value == null)
+            {
+                throw new ArgumentNullException("value");
+            }
+
+            foreach (var item in list)
+            {
+                if (string.Equals(item, value, StringComparison.OrdinalIgnoreCase))
+                {
+                    return true;
+                }
+            }
+            return false;
+        }
+    }
+}
diff --git a/MediaBrowser.Model/Extensions/StringHelper.cs b/MediaBrowser.Model/Extensions/StringHelper.cs
new file mode 100644
index 000000000..fa79d09db
--- /dev/null
+++ b/MediaBrowser.Model/Extensions/StringHelper.cs
@@ -0,0 +1,57 @@
+using System;
+using System.Text;
+
+namespace MediaBrowser.Model.Extensions
+{
+    /// <summary>
+    /// Isolating these helpers allow this entire project to be easily converted to Java
+    /// </summary>
+    public static class StringHelper
+    {
+        /// <summary>
+        /// Equalses the ignore case.
+        /// </summary>
+        /// <param name="str1">The STR1.</param>
+        /// <param name="str2">The STR2.</param>
+        /// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns>
+        public static bool EqualsIgnoreCase(string str1, string str2)
+        {
+            return string.Equals(str1, str2, StringComparison.OrdinalIgnoreCase);
+        }
+
+        /// <summary>
+        /// Replaces the specified STR.
+        /// </summary>
+        /// <param name="str">The STR.</param>
+        /// <param name="oldValue">The old value.</param>
+        /// <param name="newValue">The new value.</param>
+        /// <param name="comparison">The comparison.</param>
+        /// <returns>System.String.</returns>
+        public static string Replace(this string str, string oldValue, string newValue, StringComparison comparison)
+        {
+            var sb = new StringBuilder();
+
+            var previousIndex = 0;
+            var index = str.IndexOf(oldValue, comparison);
+
+            while (index != -1)
+            {
+                sb.Append(str.Substring(previousIndex, index - previousIndex));
+                sb.Append(newValue);
+                index += oldValue.Length;
+
+                previousIndex = index;
+                index = str.IndexOf(oldValue, index, comparison);
+            }
+
+            sb.Append(str.Substring(previousIndex));
+
+            return sb.ToString();
+        }
+
+        public static string FirstToUpper(this string str)
+        {
+            return string.IsNullOrEmpty(str) ? "" : str.Substring(0, 1).ToUpper() + str.Substring(1);
+        }
+    }
+}