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-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-/*============================================================
-**
-**
-**
-**
-**
-** Purpose: Implements a dynamically sized List as an array,
-** and provides many convenience methods for treating
-** an array as an IList.
-**
-**
-===========================================================*/
-
-using System;
-using System.Runtime;
-using System.Security;
-using System.Diagnostics;
-using System.Runtime.CompilerServices;
-using System.Runtime.Serialization;
-using System.Diagnostics.CodeAnalysis;
-using System.Diagnostics.Contracts;
-
-namespace System.Collections
-{
- // Implements a variable-size List that uses an array of objects to store the
- // elements. A ArrayList has a capacity, which is the allocated length
- // of the internal array. As elements are added to a ArrayList, the capacity
- // of the ArrayList is automatically increased as required by reallocating the
- // internal array.
- //
- [FriendAccessAllowed]
- [DebuggerTypeProxy(typeof(System.Collections.ArrayList.ArrayListDebugView))]
- [DebuggerDisplay("Count = {Count}")]
- [Serializable]
- internal class ArrayList : IList, ICloneable
- {
- private Object[] _items;
- [ContractPublicPropertyName("Count")]
- private int _size;
- private int _version;
- [NonSerialized]
- private Object _syncRoot;
-
- private const int _defaultCapacity = 4;
- private static readonly Object[] emptyArray = Array.Empty<Object>();
-
- // Constructs a ArrayList. The list is initially empty and has a capacity
- // of zero. Upon adding the first element to the list the capacity is
- // increased to _defaultCapacity, and then increased in multiples of two as required.
- public ArrayList()
- {
- _items = emptyArray;
- }
-
- // Constructs a ArrayList with a given initial capacity. The list is
- // initially empty, but will have room for the given number of elements
- // before any reallocations are required.
- //
- public ArrayList(int capacity)
- {
- if (capacity < 0) throw new ArgumentOutOfRangeException(nameof(capacity), SR.Format(SR.ArgumentOutOfRange_MustBeNonNegNum, nameof(capacity)));
- Contract.EndContractBlock();
-
- if (capacity == 0)
- _items = emptyArray;
- else
- _items = new Object[capacity];
- }
-
- // Constructs a ArrayList, copying the contents of the given collection. The
- // size and capacity of the new list will both be equal to the size of the
- // given collection.
- //
- public ArrayList(ICollection c)
- {
- if (c == null)
- throw new ArgumentNullException(nameof(c), SR.ArgumentNull_Collection);
- Contract.EndContractBlock();
-
- int count = c.Count;
- if (count == 0)
- {
- _items = emptyArray;
- }
- else
- {
- _items = new Object[count];
- AddRange(c);
- }
- }
-
- // Gets and sets the capacity of this list. The capacity is the size of
- // the internal array used to hold items. When set, the internal
- // array of the list is reallocated to the given capacity.
- //
- public virtual int Capacity
- {
- get
- {
- Contract.Ensures(Contract.Result<int>() >= Count);
- return _items.Length;
- }
- set
- {
- if (value < _size)
- {
- throw new ArgumentOutOfRangeException(nameof(value), SR.ArgumentOutOfRange_SmallCapacity);
- }
- Contract.Ensures(Capacity >= 0);
- Contract.EndContractBlock();
- // We don't want to update the version number when we change the capacity.
- // Some existing applications have dependency on this.
- if (value != _items.Length)
- {
- if (value > 0)
- {
- Object[] newItems = new Object[value];
- if (_size > 0)
- {
- Array.Copy(_items, 0, newItems, 0, _size);
- }
- _items = newItems;
- }
- else
- {
- _items = new Object[_defaultCapacity];
- }
- }
- }
- }
-
- // Read-only property describing how many elements are in the List.
- public virtual int Count
- {
- get
- {
- Contract.Ensures(Contract.Result<int>() >= 0);
- return _size;
- }
- }
-
- public virtual bool IsFixedSize
- {
- get { return false; }
- }
-
-
- // Is this ArrayList read-only?
- public virtual bool IsReadOnly
- {
- get { return false; }
- }
-
- // Is this ArrayList synchronized (thread-safe)?
- public virtual bool IsSynchronized
- {
- get { return false; }
- }
-
- // Synchronization root for this object.
- public virtual Object SyncRoot
- {
- get
- {
- if (_syncRoot == null)
- {
- System.Threading.Interlocked.CompareExchange<Object>(ref _syncRoot, new Object(), null);
- }
- return _syncRoot;
- }
- }
-
- // Sets or Gets the element at the given index.
- //
- public virtual Object this[int index]
- {
- get
- {
- if (index < 0 || index >= _size) throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_Index);
- Contract.EndContractBlock();
- return _items[index];
- }
- set
- {
- if (index < 0 || index >= _size) throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_Index);
- Contract.EndContractBlock();
- _items[index] = value;
- _version++;
- }
- }
-
- // Adds the given object to the end of this list. The size of the list is
- // increased by one. If required, the capacity of the list is doubled
- // before adding the new element.
- //
- public virtual int Add(Object value)
- {
- Contract.Ensures(Contract.Result<int>() >= 0);
- if (_size == _items.Length) EnsureCapacity(_size + 1);
- _items[_size] = value;
- _version++;
- return _size++;
- }
-
- // Adds the elements of the given collection to the end of this list. If
- // required, the capacity of the list is increased to twice the previous
- // capacity or the new size, whichever is larger.
- //
- public virtual void AddRange(ICollection c)
- {
- InsertRange(_size, c);
- }
-
-
- // Clears the contents of ArrayList.
- public virtual void Clear()
- {
- if (_size > 0)
- {
- Array.Clear(_items, 0, _size); // Don't need to doc this but we clear the elements so that the gc can reclaim the references.
- _size = 0;
- }
- _version++;
- }
-
- // Clones this ArrayList, doing a shallow copy. (A copy is made of all
- // Object references in the ArrayList, but the Objects pointed to
- // are not cloned).
- public virtual Object Clone()
- {
- Contract.Ensures(Contract.Result<Object>() != null);
- ArrayList la = new ArrayList(_size);
- la._size = _size;
- la._version = _version;
- Array.Copy(_items, 0, la._items, 0, _size);
- return la;
- }
-
-
- // Contains returns true if the specified element is in the ArrayList.
- // It does a linear, O(n) search. Equality is determined by calling
- // item.Equals().
- //
- public virtual bool Contains(Object item)
- {
- if (item == null)
- {
- for (int i = 0; i < _size; i++)
- if (_items[i] == null)
- return true;
- return false;
- }
- else
- {
- for (int i = 0; i < _size; i++)
- if ((_items[i] != null) && (_items[i].Equals(item)))
- return true;
- return false;
- }
- }
-
- // Copies this ArrayList into array, which must be of a
- // compatible array type.
- //
- public virtual void CopyTo(Array array, int arrayIndex)
- {
- if ((array != null) && (array.Rank != 1))
- throw new ArgumentException(SR.Arg_RankMultiDimNotSupported);
- Contract.EndContractBlock();
- // Delegate rest of error checking to Array.Copy.
- Array.Copy(_items, 0, array, arrayIndex, _size);
- }
-
- // Ensures that the capacity of this list is at least the given minimum
- // value. If the currect capacity of the list is less than min, the
- // capacity is increased to twice the current capacity or to min,
- // whichever is larger.
- private void EnsureCapacity(int min)
- {
- if (_items.Length < min)
- {
- int newCapacity = _items.Length == 0 ? _defaultCapacity : _items.Length * 2;
- // Allow the list to grow to maximum possible capacity (~2G elements) before encountering overflow.
- // Note that this check works even when _items.Length overflowed thanks to the (uint) cast
- if ((uint)newCapacity > Array.MaxArrayLength) newCapacity = Array.MaxArrayLength;
- if (newCapacity < min) newCapacity = min;
- Capacity = newCapacity;
- }
- }
-
- // Returns an enumerator for this list with the given
- // permission for removal of elements. If modifications made to the list
- // while an enumeration is in progress, the MoveNext and
- // GetObject methods of the enumerator will throw an exception.
- //
- public virtual IEnumerator GetEnumerator()
- {
- Contract.Ensures(Contract.Result<IEnumerator>() != null);
- return new ArrayListEnumeratorSimple(this);
- }
-
- // Returns the index of the first occurrence of a given value in a range of
- // this list. The list is searched forwards from beginning to end.
- // The elements of the list are compared to the given value using the
- // Object.Equals method.
- //
- // This method uses the Array.IndexOf method to perform the
- // search.
- //
- public virtual int IndexOf(Object value)
- {
- Contract.Ensures(Contract.Result<int>() < Count);
- return Array.IndexOf((Array)_items, value, 0, _size);
- }
-
- // Inserts an element into this list at a given index. The size of the list
- // is increased by one. If required, the capacity of the list is doubled
- // before inserting the new element.
- //
- public virtual void Insert(int index, Object value)
- {
- // Note that insertions at the end are legal.
- if (index < 0 || index > _size) throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_ArrayListInsert);
- //Contract.Ensures(Count == Contract.OldValue(Count) + 1);
- Contract.EndContractBlock();
-
- if (_size == _items.Length) EnsureCapacity(_size + 1);
- if (index < _size)
- {
- Array.Copy(_items, index, _items, index + 1, _size - index);
- }
- _items[index] = value;
- _size++;
- _version++;
- }
-
- // Inserts the elements of the given collection at a given index. If
- // required, the capacity of the list is increased to twice the previous
- // capacity or the new size, whichever is larger. Ranges may be added
- // to the end of the list by setting index to the ArrayList's size.
- //
- public virtual void InsertRange(int index, ICollection c)
- {
- if (c == null)
- throw new ArgumentNullException(nameof(c), SR.ArgumentNull_Collection);
- if (index < 0 || index > _size) throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_Index);
- //Contract.Ensures(Count == Contract.OldValue(Count) + c.Count);
- Contract.EndContractBlock();
-
- int count = c.Count;
- if (count > 0)
- {
- EnsureCapacity(_size + count);
- // shift existing items
- if (index < _size)
- {
- Array.Copy(_items, index, _items, index + count, _size - index);
- }
-
- Object[] itemsToInsert = new Object[count];
- c.CopyTo(itemsToInsert, 0);
- itemsToInsert.CopyTo(_items, index);
- _size += count;
- _version++;
- }
- }
-
- // Returns a read-only IList wrapper for the given IList.
- //
- [FriendAccessAllowed]
- public static IList ReadOnly(IList list)
- {
- if (list == null)
- throw new ArgumentNullException(nameof(list));
- Contract.Ensures(Contract.Result<IList>() != null);
- Contract.EndContractBlock();
- return new ReadOnlyList(list);
- }
-
- // Removes the element at the given index. The size of the list is
- // decreased by one.
- //
- public virtual void Remove(Object obj)
- {
- Contract.Ensures(Count >= 0);
-
- int index = IndexOf(obj);
- BCLDebug.Correctness(index >= 0 || !(obj is Int32), "You passed an Int32 to Remove that wasn't in the ArrayList." + Environment.NewLine + "Did you mean RemoveAt? int: " + obj + " Count: " + Count);
- if (index >= 0)
- RemoveAt(index);
- }
-
- // Removes the element at the given index. The size of the list is
- // decreased by one.
- //
- public virtual void RemoveAt(int index)
- {
- if (index < 0 || index >= _size) throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_Index);
- Contract.Ensures(Count >= 0);
- //Contract.Ensures(Count == Contract.OldValue(Count) - 1);
- Contract.EndContractBlock();
-
- _size--;
- if (index < _size)
- {
- Array.Copy(_items, index + 1, _items, index, _size - index);
- }
- _items[_size] = null;
- _version++;
- }
-
- // ToArray returns a new array of a particular type containing the contents
- // of the ArrayList. This requires copying the ArrayList and potentially
- // downcasting all elements. This copy may fail and is an O(n) operation.
- // Internally, this implementation calls Array.Copy.
- //
- public virtual Array ToArray(Type type)
- {
- if (type == null)
- throw new ArgumentNullException(nameof(type));
- Contract.Ensures(Contract.Result<Array>() != null);
- Contract.EndContractBlock();
- Array array = Array.UnsafeCreateInstance(type, _size);
- Array.Copy(_items, 0, array, 0, _size);
- return array;
- }
-
- [Serializable]
- private class ReadOnlyList : IList
- {
- private IList _list;
-
- internal ReadOnlyList(IList l)
- {
- _list = l;
- }
-
- public virtual int Count
- {
- get { return _list.Count; }
- }
-
- public virtual bool IsReadOnly
- {
- get { return true; }
- }
-
- public virtual bool IsFixedSize
- {
- get { return true; }
- }
-
- public virtual bool IsSynchronized
- {
- get { return _list.IsSynchronized; }
- }
-
- public virtual Object this[int index]
- {
- get
- {
- return _list[index];
- }
- set
- {
- throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
- }
- }
-
- public virtual Object SyncRoot
- {
- get { return _list.SyncRoot; }
- }
-
- public virtual int Add(Object obj)
- {
- throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
- }
-
- public virtual void Clear()
- {
- throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
- }
-
- public virtual bool Contains(Object obj)
- {
- return _list.Contains(obj);
- }
-
- public virtual void CopyTo(Array array, int index)
- {
- _list.CopyTo(array, index);
- }
-
- public virtual IEnumerator GetEnumerator()
- {
- return _list.GetEnumerator();
- }
-
- public virtual int IndexOf(Object value)
- {
- return _list.IndexOf(value);
- }
-
- public virtual void Insert(int index, Object obj)
- {
- throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
- }
-
- public virtual void Remove(Object value)
- {
- throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
- }
-
- public virtual void RemoveAt(int index)
- {
- throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
- }
- }
-
- [Serializable]
- private sealed class ArrayListEnumeratorSimple : IEnumerator, ICloneable
- {
- private ArrayList list;
- private int index;
- private int version;
- private Object currentElement;
- [NonSerialized]
- private bool isArrayList;
- // this object is used to indicate enumeration has not started or has terminated
- private static Object dummyObject = new Object();
-
- internal ArrayListEnumeratorSimple(ArrayList list)
- {
- this.list = list;
- index = -1;
- version = list._version;
- isArrayList = (list.GetType() == typeof(ArrayList));
- currentElement = dummyObject;
- }
-
- public Object Clone()
- {
- return MemberwiseClone();
- }
-
- public bool MoveNext()
- {
- if (version != list._version)
- {
- throw new InvalidOperationException(SR.GetResourceString(ResId.InvalidOperation_EnumFailedVersion));
- }
-
- if (isArrayList)
- { // avoid calling virtual methods if we are operating on ArrayList to improve performance
- if (index < list._size - 1)
- {
- currentElement = list._items[++index];
- return true;
- }
- else
- {
- currentElement = dummyObject;
- index = list._size;
- return false;
- }
- }
- else
- {
- if (index < list.Count - 1)
- {
- currentElement = list[++index];
- return true;
- }
- else
- {
- index = list.Count;
- currentElement = dummyObject;
- return false;
- }
- }
- }
-
- public Object Current
- {
- get
- {
- object temp = currentElement;
- if (dummyObject == temp)
- { // check if enumeration has not started or has terminated
- if (index == -1)
- {
- throw new InvalidOperationException(SR.GetResourceString(ResId.InvalidOperation_EnumNotStarted));
- }
- else
- {
- throw new InvalidOperationException(SR.GetResourceString(ResId.InvalidOperation_EnumEnded));
- }
- }
-
- return temp;
- }
- }
-
- public void Reset()
- {
- if (version != list._version)
- {
- throw new InvalidOperationException(SR.GetResourceString(ResId.InvalidOperation_EnumFailedVersion));
- }
-
- currentElement = dummyObject;
- index = -1;
- }
- }
-
- internal class ArrayListDebugView
- {
- private ArrayList arrayList;
- }
- }
-}