source: branches/2965_CancelablePersistence/HeuristicLab.ExtLibs/HeuristicLab.Cecil/0.9.5/Mono.Cecil-0.9.5/Mono.Cecil/Mono.Collections.Generic/Collection.cs @ 16605

//
// Collection.cs
//
// Author:
//   Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2011 Jb Evain
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

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

namespace Mono.Collections.Generic {

  public class Collection<T> : IList<T>, IList {

    internal T [] items;
    internal int size;
    int version;

    public int Count {
      get { return size; }
    }

    public T this [int index] {
      get {
        if (index >= size)
          throw new ArgumentOutOfRangeException ();

        return items [index];
      }
      set {
        CheckIndex (index);
        if (index == size)
          throw new ArgumentOutOfRangeException ();

        OnSet (value, index);

        items [index] = value;
      }
    }

    bool ICollection<T>.IsReadOnly {
      get { return false; }
    }

    bool IList.IsFixedSize {
      get { return false; }
    }

    bool IList.IsReadOnly {
      get { return false; }
    }

    object IList.this [int index] {
      get { return this [index]; }
      set {
        CheckIndex (index);

        try {
          this [index] = (T) value;
          return;
        } catch (InvalidCastException) {
        } catch (NullReferenceException) {
        }

        throw new ArgumentException ();
      }
    }

    int ICollection.Count {
      get { return Count; }
    }

    bool ICollection.IsSynchronized {
      get { return false; }
    }

    object ICollection.SyncRoot {
      get { return this; }
    }

    public Collection ()
    {
      items = Empty<T>.Array;
    }

    public Collection (int capacity)
    {
      if (capacity < 0)
        throw new ArgumentOutOfRangeException ();

      items = new T [capacity];
    }

    public Collection (ICollection<T> items)
    {
      if (items == null)
        throw new ArgumentNullException ("items");

      this.items = new T [items.Count];
      items.CopyTo (this.items, 0);
      this.size = this.items.Length;
    }

    public void Add (T item)
    {
      if (size == items.Length)
        Grow (1);

      OnAdd (item, size);

      items [size++] = item;
      version++;
    }

    public bool Contains (T item)
    {
      return IndexOf (item) != -1;
    }

    public int IndexOf (T item)
    {
      return Array.IndexOf (items, item, 0, size);
    }

    public void Insert (int index, T item)
    {
      CheckIndex (index);
      if (size == items.Length)
        Grow (1);

      OnInsert (item, index);

      Shift (index, 1);
      items [index] = item;
      version++;
    }

    public void RemoveAt (int index)
    {
      if (index < 0 || index >= size)
        throw new ArgumentOutOfRangeException ();

      var item = items [index];

      OnRemove (item, index);

      Shift (index, -1);
      Array.Clear (items, size, 1);
      version++;
    }

    public bool Remove (T item)
    {
      var index = IndexOf (item);
      if (index == -1)
        return false;

      OnRemove (item, index);

      Shift (index, -1);
      Array.Clear (items, size, 1);
      version++;

      return true;
    }

    public void Clear ()
    {
      OnClear ();

      Array.Clear (items, 0, size);
      size = 0;
      version++;
    }

    public void CopyTo (T [] array, int arrayIndex)
    {
      Array.Copy (items, 0, array, arrayIndex, size);
    }

    public T [] ToArray ()
    {
      var array = new T [size];
      Array.Copy (items, 0, array, 0, size);
      return array;
    }

    void CheckIndex (int index)
    {
      if (index < 0 || index > size)
        throw new ArgumentOutOfRangeException ();
    }

    void Shift (int start, int delta)
    {
      if (delta < 0)
        start -= delta;

      if (start < size)
        Array.Copy (items, start, items, start + delta, size - start);

      size += delta;

      if (delta < 0)
        Array.Clear (items, size, -delta);
    }

    protected virtual void OnAdd (T item, int index)
    {
    }

    protected virtual void OnInsert (T item, int index)
    {
    }

    protected virtual void OnSet (T item, int index)
    {
    }

    protected virtual void OnRemove (T item, int index)
    {
    }

    protected virtual void OnClear ()
    {
    }

    internal virtual void Grow (int desired)
    {
      int new_size = size + desired;
      if (new_size <= items.Length)
        return;

      const int default_capacity = 4;

      new_size = System.Math.Max (
        System.Math.Max (items.Length * 2, default_capacity),
        new_size);

#if !CF
      Array.Resize (ref items, new_size);
#else
      var array = new T [new_size];
      Array.Copy (items, array, size);
      items = array;
#endif
    }

    int IList.Add (object value)
    {
      try {
        Add ((T) value);
        return size - 1;
      } catch (InvalidCastException) {
      } catch (NullReferenceException) {
      }

      throw new ArgumentException ();
    }

    void IList.Clear ()
    {
      Clear ();
    }

    bool IList.Contains (object value)
    {
      return ((IList) this).IndexOf (value) > -1;
    }

    int IList.IndexOf (object value)
    {
      try {
        return IndexOf ((T) value);
      } catch (InvalidCastException) {
      } catch (NullReferenceException) {
      }

      return -1;
    }

    void IList.Insert (int index, object value)
    {
      CheckIndex (index);

      try {
        Insert (index, (T) value);
        return;
      } catch (InvalidCastException) {
      } catch (NullReferenceException) {
      }

      throw new ArgumentException ();
    }

    void IList.Remove (object value)
    {
      try {
        Remove ((T) value);
      } catch (InvalidCastException) {
      } catch (NullReferenceException) {
      }
    }

    void IList.RemoveAt (int index)
    {
      RemoveAt (index);
    }

    void ICollection.CopyTo (Array array, int index)
    {
      Array.Copy (items, 0, array, index, size);
    }

    public Enumerator GetEnumerator ()
    {
      return new Enumerator (this);
    }

    IEnumerator IEnumerable.GetEnumerator ()
    {
      return new Enumerator (this);
    }

    IEnumerator<T> IEnumerable<T>.GetEnumerator ()
    {
      return new Enumerator (this);
    }

    public struct Enumerator : IEnumerator<T>, IDisposable {

      Collection<T> collection;
      T current;

      int next;
      readonly int version;

      public T Current {
        get { return current; }
      }

      object IEnumerator.Current {
        get {
          CheckState ();

          if (next <= 0)
            throw new InvalidOperationException ();

          return current;
        }
      }

      internal Enumerator (Collection<T> collection)
        : this ()
      {
        this.collection = collection;
        this.version = collection.version;
      }

      public bool MoveNext ()
      {
        CheckState ();

        if (next < 0)
          return false;

        if (next < collection.size) {
          current = collection.items [next++];
          return true;
        }

        next = -1;
        return false;
      }

      public void Reset ()
      {
        CheckState ();

        next = 0;
      }

      void CheckState ()
      {
        if (collection == null)
          throw new ObjectDisposedException (GetType ().FullName);

        if (version != collection.version)
          throw new InvalidOperationException ();
      }

      public void Dispose ()
      {
        collection = null;
      }
    }
  }
}