Added read-only collection wrappers for IDictionary<>, IList<> and ICollection<> since the classes provided by the .NET framework in System.Collections.ObjectModel are incomplete and inconsistent (eg. System.Collections.ObjectModel.ReadOnlyCollection wraps an IList<>!); minor improvements to documentation; added ReverseComparer for inverting the results of an existing IComparer<> or simply comparing values in inverted order

git-svn-id: file:///srv/devel/repo-conversion/nusu@80 d2e56fa2-650e-0410-a79f-9358c0239efd

Nuclex.Support (x86).csproj

@@ -81,6 +81,8 @@
     <Reference Include="System">
       <Private>False</Private>
     </Reference>
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Properties\AssemblyInfo.cs" />
@@ -100,6 +102,10 @@
     <Compile Include="Source\Collections\PriorityQueue.Test.cs">
       <DependentUpon>PriorityQueue.cs</DependentUpon>
     </Compile>
+    <Compile Include="Source\Collections\ReadOnlyCollection.cs" />
+    <Compile Include="Source\Collections\ReadOnlyDictionary.cs" />
+    <Compile Include="Source\Collections\ReadOnlyList.cs" />
+    <Compile Include="Source\Collections\ReverseComparer.cs" />
     <Compile Include="Source\Collections\RingMemoryStream.cs" />
     <Compile Include="Source\Collections\RingMemoryStream.Test.cs">
       <DependentUpon>RingMemoryStream.cs</DependentUpon>

Source/Collections/PriorityQueue.cs

@@ -127,7 +127,7 @@ namespace Nuclex.Support.Collections {
 
       ItemType result = this.heap[0];
       --this.count;
-      trickleDown(0, heap[this.count]);
+      trickleDown(0, this.heap[this.count]);
 
       ++this.version;
 

Source/Collections/ReadOnlyCollection.cs

@@ -0,0 +1,120 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Nuclex.Support.Collections {
+
+  /// <summary>Wraps a Collection and prevents users from modifying it</summary>
+  /// <typeparam name="ItemType">Type of items to manage in the Collection</typeparam>
+  public class ReadOnlyCollection<ItemType> :
+    ICollection<ItemType>,
+    ICollection {
+
+    /// <summary>Initializes a new read-only Collection wrapper</summary>
+    /// <param name="collection">Collection that will be wrapped</param>
+    public ReadOnlyCollection(ICollection<ItemType> collection) {
+      this.typedCollection = collection;
+      this.objectCollection = (collection as ICollection);
+    }
+
+    /// <summary>Determines whether the List contains the specified item</summary>
+    /// <param name="item">Item that will be checked for</param>
+    /// <returns>True if the specified item is contained in the List</returns>
+    public bool Contains(ItemType item) {
+      return this.typedCollection.Contains(item);
+    }
+
+    /// <summary>Copies the contents of the List into an array</summary>
+    /// <param name="array">Array the List will be copied into</param>
+    /// <param name="arrayIndex">
+    ///   Starting index at which to begin filling the destination array
+    /// </param>
+    public void CopyTo(ItemType[] array, int arrayIndex) {
+      this.typedCollection.CopyTo(array, arrayIndex);
+    }
+
+    /// <summary>The number of items current contained in the List</summary>
+    public int Count {
+      get { return this.typedCollection.Count; }
+    }
+
+    /// <summary>Whether the List is write-protected</summary>
+    public bool IsReadOnly {
+      get { return true; }
+    }
+
+    /// <summary>Returns a new enumerator over the contents of the List</summary>
+    /// <returns>The new List contents enumerator</returns>
+    public IEnumerator<ItemType> GetEnumerator() {
+      return this.typedCollection.GetEnumerator();
+    }
+
+    #region ICollection<> implementation
+
+    /// <summary>Adds an item to the end of the List</summary>
+    /// <param name="item">Item that will be added to the List</param>
+    void ICollection<ItemType>.Add(ItemType item) {
+      throw new NotSupportedException(
+        "Adding items is not supported by the read-only List"
+      );
+    }
+
+    /// <summary>Removes all items from the List</summary>
+    void ICollection<ItemType>.Clear() {
+      throw new NotSupportedException(
+        "Clearing is not supported by the read-only List"
+      );
+    }
+
+    /// <summary>Removes the specified item from the List</summary>
+    /// <param name="item">Item that will be removed from the List</param>
+    /// <returns>True of the specified item was found in the List and removed</returns>
+    bool ICollection<ItemType>.Remove(ItemType item) {
+      throw new NotSupportedException(
+        "Removing items is not supported by the read-only List"
+      );
+    }
+
+    #endregion
+
+    #region IEnumerable implementation
+
+    /// <summary>Returns a new enumerator over the contents of the List</summary>
+    /// <returns>The new List contents enumerator</returns>
+    IEnumerator IEnumerable.GetEnumerator() {
+      return this.objectCollection.GetEnumerator();
+    }
+
+    #endregion
+
+    #region ICollection implementation
+
+    /// <summary>Copies the contents of the List into an array</summary>
+    /// <param name="array">Array the List will be copied into</param>
+    /// <param name="index">
+    ///   Starting index at which to begin filling the destination array
+    /// </param>
+    void ICollection.CopyTo(Array array, int index) {
+      throw new NotImplementedException();
+    }
+
+    /// <summary>Whether the List is synchronized for multi-threaded usage</summary>
+    bool ICollection.IsSynchronized {
+      get { throw new NotImplementedException(); }
+    }
+
+    /// <summary>Synchronization root on which the List locks</summary>
+    object ICollection.SyncRoot {
+      get { throw new NotImplementedException(); }
+    }
+
+    #endregion
+
+    /// <summary>The wrapped Collection under its type-safe interface</summary>
+    private ICollection<ItemType> typedCollection;
+    /// <summary>The wrapped Collection under its object interface</summary>
+    private ICollection objectCollection;
+
+  }
+
+} // namespace Nuclex.Support.Collections

Source/Collections/ReadOnlyDictionary.cs

@@ -0,0 +1,326 @@
+using System;
+using System.Collections.Generic;
+using System.Collections;
+using System.Collections.ObjectModel;
+using System.Runtime.Serialization;
+
+namespace Nuclex.Support.Collections {
+
+  /// <summary>Wraps a Dictionary and prevents users from modifying it</summary>
+  /// <typeparam name="KeyType">Type of the keys used in the Dictionary</typeparam>
+  /// <typeparam name="ValueType">Type of the values used in the Dictionary</typeparam>
+  public class ReadOnlyDictionary<KeyType, ValueType> :
+    IDictionary<KeyType, ValueType>,
+    IDictionary,
+    ISerializable,
+    IDeserializationCallback {
+
+    /// <summary>Initializes a new read-only Dictionary wrapper</summary>
+    /// <param name="dictionary">Dictionary that will be wrapped</param>
+    public ReadOnlyDictionary(IDictionary<KeyType, ValueType> dictionary) {
+      this.typedDictionary = dictionary;
+      this.objectDictionary = (this.typedDictionary as IDictionary);
+    }
+
+    /// <summary>Whether the directory is write-protected</summary>
+    public bool IsReadOnly {
+      get { return true; }
+    }
+
+    /// <summary>
+    ///   Determines whether the specified KeyValuePair is contained in the Dictionary
+    /// </summary>
+    /// <param name="item">KeyValuePair that will be checked for</param>
+    /// <returns>True if the provided KeyValuePair was contained in the Dictionary</returns>
+    public bool Contains(KeyValuePair<KeyType, ValueType> item) {
+      return this.typedDictionary.Contains(item);
+    }
+
+    /// <summary>Determines whether the Dictionary contains the specified key</summary>
+    /// <param name="key">Key that will be checked for</param>
+    /// <returns>
+    ///   True if an entry with the specified key was contained in the Dictionary
+    /// </returns>
+    public bool ContainsKey(KeyType key) {
+      return this.typedDictionary.ContainsKey(key);
+    }
+
+    /// <summary>Copies the contents of the Dictionary into an array</summary>
+    /// <param name="array">Array the Dictionary will be copied into</param>
+    /// <param name="arrayIndex">
+    ///   Starting index at which to begin filling the destination array
+    /// </param>
+    public void CopyTo(KeyValuePair<KeyType, ValueType>[] array, int arrayIndex) {
+      this.typedDictionary.CopyTo(array, arrayIndex);
+    }
+
+    /// <summary>Number of elements contained in the Dictionary</summary>
+    public int Count {
+      get { return this.typedDictionary.Count; }
+    }
+
+    /// <summary>Creates a new enumerator for the Dictionary</summary>
+    /// <returns>The new Dictionary enumerator</returns>
+    public IEnumerator<KeyValuePair<KeyType, ValueType>> GetEnumerator() {
+      return this.typedDictionary.GetEnumerator();
+    }
+
+    /// <summary>Collection of all keys contained in the Dictionary</summary>
+    public ICollection<KeyType> Keys {
+      get {
+        if(this.readonlyKeyCollection == null) {
+          this.readonlyKeyCollection = new ReadOnlyCollection<KeyType>(
+            this.typedDictionary.Keys
+          );
+        }
+
+        return this.readonlyKeyCollection;
+      }
+    }
+
+    /// <summary>Collection aller Werte im Dictionary</summary>
+    public ICollection<ValueType> Values { // TODO: RO-Wrappen!
+      get {
+        if(this.readonlyValueCollection == null) {
+          this.readonlyValueCollection = new ReadOnlyCollection<ValueType>(
+            this.typedDictionary.Values
+          );
+        }
+
+        return this.readonlyValueCollection;
+      }
+    }
+
+    /// <summary>
+    ///   Attempts to retrieve the item with the specified key from the Dictionary
+    /// </summary>
+    /// <param name="key">Key of the item to attempt to retrieve</param>
+    /// <param name="value">
+    ///   Output parameter that will receive the key upon successful completion
+    /// </param>
+    /// <returns>
+    ///   True if the item was found and has been placed in the output parameter
+    /// </returns>
+    public bool TryGetValue(KeyType key, out ValueType value) {
+      return this.typedDictionary.TryGetValue(key, out value);
+    }
+
+    /// <summary>Accesses an item in the Dictionary by its key</summary>
+    /// <param name="key">Key of the item that will be accessed</param>
+    public ValueType this[KeyType key] {
+      get { return this.typedDictionary[key]; }
+    }
+
+    #region IDictionary<,> implementation
+
+    /// <summary>Inserts an item into the Dictionary</summary>
+    /// <param name="key">Key under which to add the new item</param>
+    /// <param name="value">Item that will be added to the Dictionary</param>
+    void IDictionary<KeyType, ValueType>.Add(KeyType key, ValueType value) {
+      throw new NotSupportedException(
+        "Adding items is not supported by the read-only Dictionary"
+      );
+    }
+
+    /// <summary>Removes the item with the specified key from the Dictionary</summary>
+    /// <param name="key">Key of the elementes that will be removed</param>
+    /// <returns>True if an item with the specified key was found and removed</returns>
+    bool IDictionary<KeyType, ValueType>.Remove(KeyType key) {
+      throw new NotSupportedException(
+        "Removing items is not supported by the read-only Dictionary"
+      );
+    }
+
+    /// <summary>Accesses an item in the Dictionary by its key</summary>
+    /// <param name="key">Key of the item that will be accessed</param>
+    ValueType IDictionary<KeyType, ValueType>.this[KeyType key] {
+      get { return this.typedDictionary[key]; }
+      set {
+        throw new NotSupportedException(
+          "Assigning items is not supported in a read-only Dictionary"
+        );
+      }
+    }
+
+    #endregion
+
+    #region IEnumerable implementation
+
+    /// <summary>Returns a new object enumerator for the Dictionary</summary>
+    /// <returns>The new object enumerator</returns>
+    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
+      return (this.typedDictionary as IEnumerable).GetEnumerator();
+    }
+
+    #endregion
+
+    #region IDictionary implementation
+
+    /// <summary>Removes all items from the Dictionary</summary>
+    void IDictionary.Clear() {
+      throw new NotSupportedException(
+        "Clearing is not supported in a read-only Dictionary"
+      );
+    }
+
+    /// <summary>Adds an item into the Dictionary</summary>
+    /// <param name="key">Key under which the item will be added</param>
+    /// <param name="value">Item that will be added</param>
+    void IDictionary.Add(object key, object value) {
+      throw new NotSupportedException(
+        "Adding items is not supported in a read-only Dictionary"
+      );
+    }
+
+    /// <summary>Determines whether the specified key exists in the Dictionary</summary>
+    /// <param name="key">Key that will be checked for</param>
+    /// <returns>True if an item with the specified key exists in the Dictionary</returns>
+    bool IDictionary.Contains(object key) {
+      return this.objectDictionary.Contains(key);
+    }
+
+    /// <summary>Returns a new entry enumerator for the dictionary</summary>
+    /// <returns>The new entry enumerator</returns>
+    IDictionaryEnumerator IDictionary.GetEnumerator() {
+      return this.objectDictionary.GetEnumerator();
+    }
+
+    /// <summary>Whether the size of the Dictionary is fixed</summary>
+    bool IDictionary.IsFixedSize {
+      get { return this.objectDictionary.IsFixedSize; }
+    }
+
+    /// <summary>Returns a collection of all keys in the Dictionary</summary>
+    ICollection IDictionary.Keys {
+      get {
+        if(this.readonlyKeyCollection == null) {
+          this.readonlyKeyCollection = new ReadOnlyCollection<KeyType>(
+            this.typedDictionary.Keys
+          );
+        }
+
+        return this.readonlyKeyCollection;
+      }
+    }
+
+    /// <summary>Returns a collection of all values stored in the Dictionary</summary>
+    ICollection IDictionary.Values {
+      get {
+        if(this.readonlyValueCollection == null) {
+          this.readonlyValueCollection = new ReadOnlyCollection<ValueType>(
+            this.typedDictionary.Values
+          );
+        }
+
+        return this.readonlyValueCollection;
+      }
+    }
+
+    /// <summary>Removes an item from the Dictionary</summary>
+    /// <param name="key">Key of the item that will be removed</param>
+    void IDictionary.Remove(object key) {
+      throw new NotSupportedException(
+        "Removing is not supported by the read-only Dictionary"
+      );
+    }
+
+    /// <summary>Accesses an item in the Dictionary by its key</summary>
+    /// <param name="key">Key of the item that will be accessed</param>
+    /// <returns>The item with the specified key</returns>
+    object IDictionary.this[object key] {
+      get { return this.objectDictionary[key]; }
+      set {
+        throw new NotSupportedException(
+          "Assigning items is not supported by the read-only Dictionary"
+        );
+      }
+    }
+
+    #endregion
+
+    #region ICollection<> implementation
+
+    /// <summary>Inserts an already prepared element into the Dictionary</summary>
+    /// <param name="item">Prepared element that will be added to the Dictionary</param>
+    void ICollection<KeyValuePair<KeyType, ValueType>>.Add(
+      KeyValuePair<KeyType, ValueType> item
+    ) {
+      throw new NotSupportedException(
+        "Adding items is not supported by the read-only Dictionary"
+      );
+    }
+
+    /// <summary>Removes all items from the Dictionary</summary>
+    void ICollection<KeyValuePair<KeyType, ValueType>>.Clear() {
+      throw new NotSupportedException(
+        "Clearing is not supported in a read-only Dictionary"
+      );
+    }
+
+    /// <summary>Removes all items from the Dictionary</summary>
+    /// <param name="itemToRemove">Item that will be removed from the Dictionary</param>
+    bool ICollection<KeyValuePair<KeyType, ValueType>>.Remove(
+      KeyValuePair<KeyType, ValueType> itemToRemove
+    ) {
+      throw new NotSupportedException(
+        "Removing items is not supported in a read-only Dictionary"
+      );
+    }
+
+    #endregion
+
+    #region ICollection implementation
+
+    /// <summary>Copies the contents of the Dictionary into an array</summary>
+    /// <param name="array">Array the Dictionary contents will be copied into</param>
+    /// <param name="index">
+    ///   Starting index at which to begin filling the destination array
+    /// </param>
+    void ICollection.CopyTo(Array array, int index) {
+      this.objectDictionary.CopyTo(array, index);
+    }
+
+    /// <summary>Whether the Dictionary is synchronized for multi-threaded usage</summary>
+    bool ICollection.IsSynchronized {
+      get { return this.objectDictionary.IsSynchronized; }
+    }
+
+    /// <summary>Synchronization root on which the Dictionary locks</summary>
+    object ICollection.SyncRoot {
+      get { return this.objectDictionary.SyncRoot; }
+    }
+
+    #endregion
+
+    #region ISerializable implementation
+
+    /// <summary>Serializes the Dictionary</summary>
+    /// <param name="info">
+    ///   Provides the container into which the Dictionary will serialize itself
+    /// </param>
+    /// <param name="context">
+    ///   Contextual informations about the serialization environment
+    /// </param>
+    void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) {
+      (this.typedDictionary as ISerializable).GetObjectData(info, context);
+    }
+
+    /// <summary>Called after all objects have been successfully deserialized</summary>
+    /// <param name="sender">Nicht unterstützt</param>
+    void IDeserializationCallback.OnDeserialization(object sender) {
+      (this.typedDictionary as IDeserializationCallback).OnDeserialization(sender);
+    }
+
+    #endregion
+
+    /// <summary>The wrapped Dictionary under its type-safe interface</summary>
+    private IDictionary<KeyType, ValueType> typedDictionary;
+    /// <summary>The wrapped Dictionary under its object interface</summary>
+    private IDictionary objectDictionary;
+    /// <summary>ReadOnly wrapper for the keys collection of the Dictionary</summary>
+    private ReadOnlyCollection<KeyType> readonlyKeyCollection;
+    /// <summary>ReadOnly wrapper for the values collection of the Dictionary</summary>
+    private ReadOnlyCollection<ValueType> readonlyValueCollection;
+  }
+
+} // namespace Nuclex.Support.Collections

Source/Collections/ReadOnlyList.cs

@@ -0,0 +1,240 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Nuclex.Support.Collections {
+
+  /// <summary>Wraps a List and prevents users from modifying it</summary>
+  /// <typeparam name="ItemType">Type of items to manage in the List</typeparam>
+  public class ReadOnlyList<ItemType> :
+    IList<ItemType>,
+    IList {
+
+    /// <summary>Initializes a new read-only List wrapper</summary>
+    /// <param name="list">List that will be wrapped</param>
+    public ReadOnlyList(IList<ItemType> list) {
+      this.typedList = list;
+      this.objectList = (list as IList);
+    }
+
+    /// <summary>Retrieves the index of an item within the List</summary>
+    /// <param name="item">Item whose index will be returned</param>
+    /// <returns>The zero-based index of the specified item in the List</returns>
+    public int IndexOf(ItemType item) {
+      return this.typedList.IndexOf(item);
+    }
+
+    /// <summary>Accesses the List item with the specified index</summary>
+    /// <param name="index">Zero-based index of the List item that will be accessed</param>
+    public ItemType this[int index] {
+      get { return this.typedList[index]; }
+    }
+
+    /// <summary>Determines whether the List contains the specified item</summary>
+    /// <param name="item">Item that will be checked for</param>
+    /// <returns>True if the specified item is contained in the List</returns>
+    public bool Contains(ItemType item) {
+      return this.typedList.Contains(item);
+    }
+
+    /// <summary>Copies the contents of the List into an array</summary>
+    /// <param name="array">Array the List will be copied into</param>
+    /// <param name="arrayIndex">
+    ///   Starting index at which to begin filling the destination array
+    /// </param>
+    public void CopyTo(ItemType[] array, int arrayIndex) {
+      this.typedList.CopyTo(array, arrayIndex);
+    }
+
+    /// <summary>The number of items current contained in the List</summary>
+    public int Count {
+      get { return this.typedList.Count; }
+    }
+
+    /// <summary>Whether the List is write-protected</summary>
+    public bool IsReadOnly {
+      get { return true; }
+    }
+
+    /// <summary>Returns a new enumerator over the contents of the List</summary>
+    /// <returns>The new List contents enumerator</returns>
+    public IEnumerator<ItemType> GetEnumerator() {
+      return this.typedList.GetEnumerator();
+    }
+
+    #region IList<> implementation
+
+    /// <summary>Inserts an item into the List</summary>
+    /// <param name="index">Zero-based index before which the item will be inserted</param>
+    /// <param name="item">Item that will be inserted into the List</param>
+    void IList<ItemType>.Insert(int index, ItemType item) {
+      throw new NotSupportedException(
+        "Inserting items is not supported by the read-only List"
+      );
+    }
+
+    /// <summary>Removes an item from the list</summary>
+    /// <param name="index">Zero-based index of the item that will be removed</param>
+    void IList<ItemType>.RemoveAt(int index) {
+      throw new NotSupportedException(
+        "Removing items is not supported by the read-only List"
+      );
+    }
+
+    /// <summary>Accesses the List item with the specified index</summary>
+    /// <param name="index">Zero-based index of the List item that will be accessed</param>
+    ItemType IList<ItemType>.this[int index] {
+      get { return this.typedList[index]; }
+      set {
+        throw new NotSupportedException(
+          "Assigning items is not supported by the read-only List"
+        );
+      }
+    }
+
+    #endregion
+
+    #region ICollection<> implementation
+
+    /// <summary>Adds an item to the end of the List</summary>
+    /// <param name="item">Item that will be added to the List</param>
+    void ICollection<ItemType>.Add(ItemType item) {
+      throw new NotSupportedException(
+        "Adding items is not supported by the read-only List"
+      );
+    }
+
+    /// <summary>Removes all items from the List</summary>
+    void ICollection<ItemType>.Clear() {
+      throw new NotSupportedException(
+        "Clearing is not supported by the read-only List"
+      );
+    }
+
+    /// <summary>Removes the specified item from the List</summary>
+    /// <param name="item">Item that will be removed from the List</param>
+    /// <returns>True of the specified item was found in the List and removed</returns>
+    bool ICollection<ItemType>.Remove(ItemType item) {
+      throw new NotSupportedException(
+        "Removing items is not supported by the read-only List"
+      );
+    }
+
+    #endregion
+
+    #region IEnumerable implementation
+
+    /// <summary>Returns a new enumerator over the contents of the List</summary>
+    /// <returns>The new List contents enumerator</returns>
+    IEnumerator IEnumerable.GetEnumerator() {
+      return this.objectList.GetEnumerator();
+    }
+
+    #endregion
+
+    #region IList implementation
+
+    /// <summary>Removes all items from the List</summary>
+    void IList.Clear() {
+      throw new NotSupportedException(
+        "Clearing is not supported by the read-only List"
+      );
+    }
+
+    /// <summary>Adds an item to the end of the List</summary>
+    /// <param name="value">Item that will be added to the List</param>
+    int IList.Add(object value) {
+      throw new NotSupportedException(
+        "Adding items is not supported by the read-only List"
+      );
+    }
+
+    /// <summary>Determines whether the List contains the specified item</summary>
+    /// <param name="value">Item that will be checked for</param>
+    /// <returns>True if the specified item is contained in the List</returns>
+    bool IList.Contains(object value) {
+      return this.objectList.Contains(value);
+    }
+
+    /// <summary>Retrieves the index of an item within the List</summary>
+    /// <param name="value">Item whose index will be returned</param>
+    /// <returns>The zero-based index of the specified item in the List</returns>
+    int IList.IndexOf(object value) {
+      return this.objectList.IndexOf(value);
+    }
+
+    /// <summary>Inserts an item into the List</summary>
+    /// <param name="index">Zero-based index before which the item will be inserted</param>
+    /// <param name="value">Item that will be inserted into the List</param>
+    void IList.Insert(int index, object value) {
+      throw new NotSupportedException(
+        "Inserting items is not supported by the read-only List"
+      );
+    }
+
+    /// <summary>Whether the size of the List is fixed</summary>
+    bool IList.IsFixedSize {
+      get { throw new NotImplementedException(); }
+    }
+
+    /// <summary>Removes the specified item from the List</summary>
+    /// <param name="value">Item that will be removed from the List</param>
+    /// <returns>True of the specified item was found in the List and removed</returns>
+    void IList.Remove(object value) {
+      throw new NotSupportedException(
+        "Removing items is not supported by the read-only List"
+      );
+    }
+
+    /// <summary>Removes an item from the list</summary>
+    /// <param name="index">Zero-based index of the item that will be removed</param>
+    void IList.RemoveAt(int index) {
+      throw new NotSupportedException(
+        "Removing items is not supported by the read-only List"
+      );
+    }
+
+    /// <summary>Accesses the List item with the specified index</summary>
+    /// <param name="index">Zero-based index of the List item that will be accessed</param>
+    object IList.this[int index] {
+      get { return this.objectList[index]; }
+      set {
+        throw new NotSupportedException(
+          "Assigning items is not supported by the read-only List"
+        );
+      }
+    }
+
+    #endregion
+
+    #region ICollection implementation
+
+    /// <summary>Copies the contents of the List into an array</summary>
+    /// <param name="array">Array the List will be copied into</param>
+    /// <param name="index">
+    ///   Starting index at which to begin filling the destination array
+    /// </param>
+    void ICollection.CopyTo(Array array, int index) {
+      this.objectList.CopyTo(array, index);
+    }
+
+    /// <summary>Whether the List is synchronized for multi-threaded usage</summary>
+    bool ICollection.IsSynchronized {
+      get { return this.objectList.IsSynchronized; }
+    }
+
+    /// <summary>Synchronization root on which the List locks</summary>
+    object ICollection.SyncRoot {
+      get { return this.objectList.SyncRoot; }
+    }
+
+    #endregion
+
+    /// <summary>The wrapped List under its type-safe interface</summary>
+    private IList<ItemType> typedList;
+    /// <summary>The wrapped List under its object interface</summary>
+    private IList objectList;
+
+  }
+
+} // namespace Nuclex.Support.Collections

Source/Collections/ReverseComparer.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+
+namespace Nuclex.Support.Collections {
+
+  /// <summary>
+  ///   Compares two values in reverse or reverses the output of another comparer
+  /// </summary>
+  /// <typeparam name="ComparedType">Type of values to be compared</typeparam>
+  public class ReverseComparer<ComparedType> : IComparer<ComparedType> {
+
+    /// <summary>Initializes a new reverse comparer</summary>
+    public ReverseComparer() : this(Comparer<ComparedType>.Default) { }
+
+    /// <summary>
+    ///   Initializes the comparer to provide the inverse results of another comparer
+    /// </summary>
+    /// <param name="comparerToReverse">Comparer whose results will be inversed</param>
+    public ReverseComparer(IComparer<ComparedType> comparerToReverse) {
+      this.comparer = comparerToReverse;
+    }
+
+    /// <summary>Compares the left value to the right value</summary>
+    /// <param name="left">Value on the left side</param>
+    /// <param name="right">Value on the right side</param>
+    /// <returns>The relationship of the two values</returns>
+    public int Compare(ComparedType left, ComparedType right) {
+      return this.comparer.Compare(right, left); // intentionally reversed 
+    }
+
+    /// <summary>The default comparer from the .NET framework</summary>
+    private IComparer<ComparedType> comparer;
+
+  }
+
+} // namespace Nuclex.Support.Collections

Source/Collections/RingMemoryStream.cs

@@ -25,7 +25,7 @@ namespace Nuclex.Support.Collections {
 
   /// <summary>Specialized memory stream for ring buffers</summary>
   /// <remarks>
-  ///   This ring buffer class is specialized for binary data and attempts to achieve
+  ///   This ring buffer class is specialized for binary data and tries to achieve
   ///   optimal efficiency when storing and retrieving chunks of several bytes
   ///   at once. Typical use cases include audio and network buffers where one party
   ///   is responsible for refilling the buffer at regular intervals while the other
@@ -50,10 +50,11 @@ namespace Nuclex.Support.Collections {
       get { return this.ringBuffer.Length; }
       set {
         int length = (int)Length;
-        if(value < length)
+        if(value < length) {
           throw new ArgumentOutOfRangeException(
-            "New capacity is less than the stream's length"
+            "New capacity is less than the stream's current length"
           );
+        }
 
         // This could be done in a more efficient manner than just replacing
         // the entire buffer, but since this operation will probably be only called
@@ -62,8 +63,9 @@ namespace Nuclex.Support.Collections {
         MemoryStream newBuffer = new MemoryStream((int)value);
 
         newBuffer.SetLength(value);
-        if(length > 0)
+        if(length > 0) {
           Read(newBuffer.GetBuffer(), 0, length);
+        }
 
         this.ringBuffer.Close(); // Equals dispose of the old buffer
         this.ringBuffer = newBuffer;
@@ -119,9 +121,10 @@ namespace Nuclex.Support.Collections {
           this.ringBuffer.Read(buffer, offset, count);
           this.startIndex += count;
 
-          if(this.startIndex == this.endIndex)
+          if(this.startIndex == this.endIndex) {
             setEmpty();
           }
+        }
 
         // The end index lies before the start index, so the data in the
         // ring memory stream is fragmented. Example: |#####>-------<#####|
@@ -151,9 +154,10 @@ namespace Nuclex.Support.Collections {
 
         }
 
-        if(this.startIndex == this.endIndex)
+        if(this.startIndex == this.endIndex) {
           setEmpty();
         }
+      }
 
       return count;
     }