Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Collections / Stack.cs / 1 / Stack.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================================== ** ** Class: Stack ** ** Purpose: An array implementation of a stack. ** ** =============================================================================*/ namespace System.Collections { using System; using System.Security.Permissions; using System.Diagnostics; // A simple stack of objects. Internally it is implemented as an array, // so Push can be O(n). Pop is O(1). [DebuggerTypeProxy(typeof(System.Collections.Stack.StackDebugView))] [DebuggerDisplay("Count = {Count}")] [System.Runtime.InteropServices.ComVisible(true)] [Serializable()] public class Stack : ICollection, ICloneable { private Object[] _array; // Storage for stack elements private int _size; // Number of items in the stack. private int _version; // Used to keep enumerator in sync w/ collection. [NonSerialized] private Object _syncRoot; private const int _defaultCapacity = 10; public Stack() { _array = new Object[_defaultCapacity]; _size = 0; _version = 0; } // Create a stack with a specific initial capacity. The initial capacity // must be a non-negative number. public Stack(int initialCapacity) { if (initialCapacity < 0) throw new ArgumentOutOfRangeException("initialCapacity", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (initialCapacity < _defaultCapacity) initialCapacity = _defaultCapacity; // Simplify doubling logic in Push. _array = new Object[initialCapacity]; _size = 0; _version = 0; } // Fills a Stack with the contents of a particular collection. The items are // pushed onto the stack in the same order they are read by the enumerator. // public Stack(ICollection col) : this((col==null ? 32 : col.Count)) { if (col==null) throw new ArgumentNullException("col"); IEnumerator en = col.GetEnumerator(); while(en.MoveNext()) Push(en.Current); } public virtual int Count { get { return _size; } } public virtual bool IsSynchronized { get { return false; } } public virtual Object SyncRoot { get { if( _syncRoot == null) { System.Threading.Interlocked.CompareExchange(ref _syncRoot, new Object(), null); } return _syncRoot; } } // Removes all Objects from the Stack. public virtual void Clear() { Array.Clear(_array, 0, _size); // Don't need to doc this but we clear the elements so that the gc can reclaim the references. _size = 0; _version++; } public virtual Object Clone() { Stack s = new Stack(_size); s._size = _size; Array.Copy(_array, 0, s._array, 0, _size); s._version = _version; return s; } public virtual bool Contains(Object obj) { int count = _size; while (count-- > 0) { if (obj == null) { if (_array[count] == null) return true; } else if (_array[count] != null && _array[count].Equals(obj)) { return true; } } return false; } // Copies the stack into an array. public virtual void CopyTo(Array array, int index) { if (array==null) throw new ArgumentNullException("array"); if (array.Rank != 1) throw new ArgumentException(Environment.GetResourceString("Arg_RankMultiDimNotSupported")); if (index < 0) throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (array.Length - index < _size) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); int i = 0; if (array is Object[]) { Object[] objArray = (Object[]) array; while(i < _size) { objArray[i+index] = _array[_size-i-1]; i++; } } else { while(i < _size) { array.SetValue(_array[_size-i-1], i+index); i++; } } } // Returns an IEnumerator for this Stack. public virtual IEnumerator GetEnumerator() { return new StackEnumerator(this); } // Returns the top object on the stack without removing it. If the stack // is empty, Peek throws an InvalidOperationException. public virtual Object Peek() { if (_size==0) throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EmptyStack")); return _array[_size-1]; } // Pops an item from the top of the stack. If the stack is empty, Pop // throws an InvalidOperationException. public virtual Object Pop() { if (_size == 0) throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_EmptyStack")); _version++; Object obj = _array[--_size]; _array[_size] = null; // Free memory quicker. return obj; } // Pushes an item to the top of the stack. // public virtual void Push(Object obj) { if (_size == _array.Length) { Object[] newArray = new Object[2*_array.Length]; Array.Copy(_array, 0, newArray, 0, _size); _array = newArray; } _array[_size++] = obj; _version++; } // Returns a synchronized Stack. // [HostProtection(Synchronization=true)] public static Stack Synchronized(Stack stack) { if (stack==null) throw new ArgumentNullException("stack"); return new SyncStack(stack); } // Copies the Stack to an array, in the same order Pop would return the items. public virtual Object[] ToArray() { Object[] objArray = new Object[_size]; int i = 0; while(i < _size) { objArray[i] = _array[_size-i-1]; i++; } return objArray; } [Serializable()] private class SyncStack : Stack { private Stack _s; private Object _root; internal SyncStack(Stack stack) { _s = stack; _root = stack.SyncRoot; } public override bool IsSynchronized { get { return true; } } public override Object SyncRoot { get { return _root; } } public override int Count { get { lock (_root) { return _s.Count; } } } public override bool Contains(Object obj) { lock (_root) { return _s.Contains(obj); } } public override Object Clone() { lock (_root) { return new SyncStack((Stack)_s.Clone()); } } public override void Clear() { lock (_root) { _s.Clear(); } } public override void CopyTo(Array array, int arrayIndex) { lock (_root) { _s.CopyTo(array, arrayIndex); } } public override void Push(Object value) { lock (_root) { _s.Push(value); } } public override Object Pop() { lock (_root) { return _s.Pop(); } } public override IEnumerator GetEnumerator() { lock (_root) { return _s.GetEnumerator(); } } public override Object Peek() { lock (_root) { return _s.Peek(); } } public override Object[] ToArray() { lock (_root) { return _s.ToArray(); } } } [Serializable()] private class StackEnumerator : IEnumerator, ICloneable { private Stack _stack; private int _index; private int _version; private Object currentElement; internal StackEnumerator(Stack stack) { _stack = stack; _version = _stack._version; _index = -2; currentElement = null; } public Object Clone() { return MemberwiseClone(); } public virtual bool MoveNext() { bool retval; if (_version != _stack._version) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumFailedVersion)); if (_index == -2) { // First call to enumerator. _index = _stack._size-1; retval = ( _index >= 0); if (retval) currentElement = _stack._array[_index]; return retval; } if (_index == -1) { // End of enumeration. return false; } retval = (--_index >= 0); if (retval) currentElement = _stack._array[_index]; else currentElement = null; return retval; } public virtual Object Current { get { if (_index == -2) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumNotStarted)); if (_index == -1) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumEnded)); return currentElement; } } public virtual void Reset() { if (_version != _stack._version) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumFailedVersion)); _index = -2; currentElement = null; } } internal class StackDebugView { private Stack stack; public StackDebugView( Stack stack) { if( stack == null) throw new ArgumentNullException("stack"); this.stack = stack; } [DebuggerBrowsable(DebuggerBrowsableState.RootHidden)] public Object[] Items { get { return stack.ToArray(); } } } } }
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