ObjectSet.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Util / ObjectSet.cs / 1 / ObjectSet.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * ObjectSet class 
 *
 * Copyright (c) 1999 Microsoft Corporation 
 */

// Generics are causing perf regressions, so don't use them for now until we can figure
// it out (VSWhidbey 463572) 
//#define USEGENERICSET
 
namespace System.Web.Util { 

using System.Reflection; 
using System.Collections;
using System.Collections.Generic;

#if USEGENERICSET 
/*
 * Holds a set of unique objects of a specific type 
 */ 
internal class ObjectSet : ICollection, ICollection {
 
    protected const int StartingCapacity = 8;

    private class EmptyEnumerator : IEnumerator {
        object IEnumerator.Current { get { return null; } } 
        T IEnumerator.Current { get { return default(T); } }
        bool IEnumerator.MoveNext() { return false; } 
        void IEnumerator.Reset() { } 
        void IDisposable.Dispose() { }
    } 

    private static EmptyEnumerator _emptyEnumerator = new EmptyEnumerator();
    private Dictionary _objects;
 
    protected virtual Dictionary CreateDictionary() {
        return new Dictionary(StartingCapacity); 
    } 

    public void AddCollection(ICollection c) { 
        foreach (T o in c) {
            Add(o);
        }
    } 

    public void Add(T o) { 
        if (_objects == null) { 
            _objects = CreateDictionary();
        } 

        _objects[o] = null;
    }
 
    public bool Remove(T o) {
        if (_objects == null) 
            return false; 

        return _objects.Remove(o); 
    }

    public bool Contains(T o) {
        if (_objects == null) 
            return false;
 
        return _objects.ContainsKey(o); 
    }
 
    bool ICollection.IsReadOnly {
        get {
            return true;
        } 
    }
 
    public void Clear() { 
        if (_objects != null)
            _objects.Clear(); 
    }

    IEnumerator IEnumerable.GetEnumerator() {
        if (_objects == null) 
            return _emptyEnumerator;
 
        return _objects.Keys.GetEnumerator(); 
    }
 
    IEnumerator IEnumerable.GetEnumerator() {
        if (_objects == null)
            return _emptyEnumerator;
 
        return _objects.Keys.GetEnumerator();
    } 
 
    public int Count {
        get { 
            if (_objects == null)
                return 0;
            return _objects.Keys.Count;
        } 
    }
 
    void ICollection.CopyTo(T[] array, int index) { 
        if (_objects != null)
            _objects.Keys.CopyTo(array, index); 
    }

    bool ICollection.IsSynchronized {
        get { 
            if (_objects == null)
                return true; 
            return ((ICollection)_objects.Keys).IsSynchronized; 
        }
    } 

    object ICollection.SyncRoot {
        get {
            if (_objects == null) 
                return this;
            return ((ICollection)_objects.Keys).SyncRoot; 
        } 
    }
 
    public void CopyTo(Array array, int index) {
        if (_objects != null)
            ((ICollection)_objects.Keys).CopyTo(array, index);
    } 
}
 
internal class StringSet : ObjectSet { } 

internal class CaseInsensitiveStringSet : StringSet { 
    protected override Dictionary CreateDictionary() {
        return new Dictionary(StartingCapacity, StringComparer.InvariantCultureIgnoreCase);
    }
} 

internal class VirtualPathSet : ObjectSet { } 
 
internal class AssemblySet : ObjectSet {
    internal static AssemblySet Create(ICollection c) { 
        AssemblySet objectSet = new AssemblySet();
        objectSet.AddCollection(c);
        return objectSet;
    } 
}
 
internal class BuildProviderSet : ObjectSet { } 

internal class ControlSet : ObjectSet { } 
#else

/*
 * Holds a set of unique objects 
 */
internal class ObjectSet: ICollection { 
 
    private class EmptyEnumerator: IEnumerator {
        public object Current { get { return null; } } 
        public bool MoveNext() { return false; }
        public void Reset() {}
    }
 
    private static EmptyEnumerator _emptyEnumerator = new EmptyEnumerator();
    private IDictionary _objects; 
 
    internal ObjectSet() {}
 
    // By default, it's case sensitive
    protected virtual bool CaseInsensitive { get { return false; } }

    public void Add(object o) { 
        if (_objects == null)
            _objects = new System.Collections.Specialized.HybridDictionary(CaseInsensitive); 
 
        _objects[o] = null;
    } 

    public void AddCollection(ICollection c) {
        foreach (object o in c) {
            Add(o); 
        }
    } 
 
    public void Remove(object o) {
        if (_objects == null) 
            return;

        _objects.Remove(o);
    } 

    public bool Contains(object o) { 
        if (_objects == null) 
            return false;
 
        return _objects.Contains(o);
    }

    IEnumerator IEnumerable.GetEnumerator() { 
        if (_objects == null)
            return _emptyEnumerator; 
 
        return _objects.Keys.GetEnumerator();
    } 

    public int Count {
        get {
            if (_objects == null) 
                return 0;
            return _objects.Keys.Count; 
        } 
    }
 
    bool ICollection.IsSynchronized {
        get {
            if (_objects == null)
                return true; 
            return _objects.Keys.IsSynchronized;
        } 
    } 

    object ICollection.SyncRoot { 
        get {
            if (_objects == null)
                return this;
            return _objects.Keys.SyncRoot; 
        }
    } 
 
    public void CopyTo(Array array, int index) {
        if (_objects != null) 
            _objects.Keys.CopyTo(array, index);
    }
}
 
internal class StringSet: ObjectSet {
    internal StringSet() {} 
} 

internal class CaseInsensitiveStringSet: StringSet { 
    protected override bool CaseInsensitive { get { return true; } }
}

internal class VirtualPathSet : ObjectSet { 
    internal VirtualPathSet() { }
} 
 
internal class AssemblySet : ObjectSet {
    internal AssemblySet() { } 

    internal static AssemblySet Create(ICollection c) {
        AssemblySet objectSet = new AssemblySet();
        objectSet.AddCollection(c); 
        return objectSet;
    } 
} 

internal class BuildProviderSet : ObjectSet { 
    internal BuildProviderSet() { }
}

internal class ControlSet : ObjectSet { 
    internal ControlSet() { }
} 
 
#endif
 
}

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