readonlylistbase.cs

C#写的类似于STL的集合类,首先是C#编写,可以用于.net变程.

//******************************
// Written by Peter Golde
// Copyright (c) 2004-2005, Wintellect
//
// Use and restribution of this code is subject to the license agreement 
// contained in the file "License.txt" accompanying this file.
//******************************

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

namespace Wintellect.PowerCollections
{
    /// <summary>
    /// ReadOnlyListBase is an abstract class that can be used as a base class for a read-only collection that needs 
    /// to implement the generic IList&lt;T&gt; and non-generic IList collections. The derived class needs
    /// to override the Count property and the get part of the indexer. The implementation
    /// of all the other methods in IList&lt;T&gt; and IList are handled by ListBase.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    [Serializable]
    public abstract class ReadOnlyListBase<T> : ReadOnlyCollectionBase<T>, IList<T>, IList
    {
        /// <summary>
        /// Creates a new ReadOnlyListBase.
        /// </summary>
        protected ReadOnlyListBase()
        {
        }

        /// <summary>
        /// Throws an NotSupportedException stating that this collection cannot be modified.
        /// </summary>
        private void MethodModifiesCollection()
        {
            throw new NotSupportedException(string.Format(Strings.CannotModifyCollection, Util.SimpleClassName(this.GetType())));
        }

        /// <summary>
        /// The property must be overridden by the derived class to return the number of 
        /// items in the list.
        /// </summary>
        /// <value>The number of items in the list.</value>
        public abstract override int Count { get;}

        /// <summary>
        /// The get part of the indexer must be overridden by the derived class to get 
        /// values of the list at a particular index.
        /// </summary>
        /// <param name="index">The index in the list to get or set an item at. The
        /// first item in the list has index 0, and the last has index Count-1.</param>
        /// <returns>The item at the given index.</returns>
        /// <exception cref="ArgumentOutOfRangeException"><paramref name="index"/> is
        /// less than zero or greater than or equal to Count.</exception>
        public virtual T this[int index]
        {
            get
            {
                throw new NotImplementedException(Strings.MustOverrideIndexerGet);
            }

            set
            {
                MethodModifiesCollection();
            }
        }

        /// <summary>
        /// Enumerates all of the items in the list, in order. The item at index 0
        /// is enumerated first, then the item at index 1, and so on.
        /// </summary>
        /// <returns>An IEnumerator&lt;T&gt; that enumerates all the
        /// items in the list.</returns>
        public override IEnumerator<T> GetEnumerator()
        {
            int count = Count;
            for (int i = 0; i < count; ++i) {
                yield return this[i];
            }
        }

        /// <summary>
        /// Determines if the list contains any item that compares equal to <paramref name="item"/>.
        /// The implementation simply checks whether IndexOf(item) returns a non-negative value.
        /// </summary>
        /// <remarks>Equality in the list is determined by the default sense of
        /// equality for T. If T implements IComparable&lt;T&gt;, the
        /// Equals method of that interface is used to determine equality. Otherwise, 
        /// Object.Equals is used to determine equality.</remarks>
        /// <param name="item">The item to search for.</param>
        /// <returns>True if the list contains an item that compares equal to <paramref name="item"/>.</returns>
        public override bool Contains(T item)
        {
            return (IndexOf(item) >= 0);
        }

        /// <summary>
        /// Copies all the items in the list, in order, to <paramref name="array"/>,
        /// starting at index 0.
        /// </summary>
        /// <param name="array">The array to copy to. This array must have a size
        /// that is greater than or equal to Count.</param>
        public virtual void CopyTo(T[] array)
        {
            this.CopyTo(array, 0);
        }

        /// <summary>
        /// Copies all the items in the list, in order, to <paramref name="array"/>,
        /// starting at <paramref name="arrayIndex"/>.
        /// </summary>
        /// <param name="array">The array to copy to. This array must have a size
        /// that is greater than or equal to Count + arrayIndex.</param>
        /// <param name="arrayIndex">The starting index in <paramref name="array"/>
        /// to copy to.</param>
        public override void CopyTo(T[] array, int arrayIndex)
        {
            base.CopyTo(array, arrayIndex);
        }

        /// <summary>
        /// Copies a range of elements from the list to <paramref name="array"/>,
        /// starting at <paramref name="arrayIndex"/>.
        /// </summary>
        /// <param name="index">The starting index in the source list of the range to copy.</param>
        /// <param name="array">The array to copy to. This array must have a size
        /// that is greater than or equal to Count + arrayIndex.</param>
        /// <param name="arrayIndex">The starting index in <paramref name="array"/>
        /// to copy to.</param>
        /// <param name="count">The number of items to copy.</param>
        public virtual void CopyTo(int index, T[] array, int arrayIndex, int count)
        {
            Range(index, count).CopyTo(array, arrayIndex);
        }

        /// <summary>
        /// Finds the first item in the list that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, than
        /// the default value for T (null or all-zero) is returned.
        /// </summary>
        /// <remarks>If the default value for T (null or all-zero) matches the condition defined by <paramref name="predicate"/>,
        /// and the list might contain the default value, then it is impossible to distinguish the different between finding
        /// the default value and not finding any item. To distinguish these cases, use <see cref="TryFind"/>.</remarks>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <returns>The first item that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, the default value for T is returned.</returns>
        /// <seealso cref="TryFind"/>
        public virtual T Find(Predicate<T> predicate)
        {
            return Algorithms.FindFirstWhere(this, predicate);
        }

        /// <summary>
        /// Finds the first item in the list that satisfies the condition
        /// defined by <paramref name="predicate"/>. 
        /// </summary>
        /// <param name="predicate">A delegate that defines the condition to check for.</param>
        /// <param name="foundItem">If true is returned, this parameter receives the first item in the list
        /// that satifies the condition defined by <paramref name="predicate"/>.</param>
        /// <returns>True if an item that  satisfies the condition <paramref name="predicate"/> was found. False 
        /// if no item in the list satisfies that condition.</returns>
        public virtual bool TryFind(Predicate<T> predicate, out T foundItem)
        {
            return Algorithms.TryFindFirstWhere<T>(this, predicate, out foundItem);
        }

        /// <summary>
        /// Finds the last item in the list that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, than
        /// the default value for T (null or all-zero) is returned.
        /// </summary>
        /// <remarks>If the default value for T (null or all-zero) matches the condition defined by <paramref name="predicate"/>,
        /// and the list might contain the default value, then it is impossible to distinguish the different between finding
        /// the default value and not finding any item. To distinguish these cases, use <see cref="TryFindLast"/>.</remarks>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <returns>The last item that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, the default value for T is returned.</returns>
        /// <seealso cref="TryFindLast"/>
        public virtual T FindLast(Predicate<T> predicate)
        {
            return Algorithms.FindLastWhere(this, predicate);
        }

        /// <summary>
        /// Finds the last item in the list that satisfies the condition
        /// defined by <paramref name="predicate"/>. 
        /// </summary>
        /// <param name="predicate">A delegate that defines the condition to check for.</param>
        /// <param name="foundItem">If true is returned, this parameter receives the last item in the list
        /// that satifies the condition defined by <paramref name="predicate"/>.</param>
        /// <returns>True if an item that  satisfies the condition <paramref name="predicate"/> was found. False 
        /// if no item in the list satisfies that condition.</returns>
        public virtual bool TryFindLast(Predicate<T> predicate, out T foundItem)
        {
            return Algorithms.TryFindLastWhere<T>(this, predicate, out foundItem);
        }

        /// <summary>
        /// Finds the index of the first item in the list that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, -1 is returned.
        /// </summary>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <returns>The index of the first item that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, -1 is returned.</returns>
        public virtual int FindIndex(Predicate<T> predicate)
        {
            return Algorithms.FindFirstIndexWhere<T>(this, predicate);
        }

        /// <summary>
        /// Finds the index of the first item, in the range of items extending from <paramref name="index"/> to the end, that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, -1 is returned.
        /// </summary>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <param name="index">The starting index of the range to check.</param>
        /// <returns>The index of the first item in the given range that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, -1 is returned.</returns>
        public virtual int FindIndex(int index, Predicate<T> predicate)
        {
            int foundIndex = Algorithms.FindFirstIndexWhere<T>(Range(index, Count - index), predicate);
            if (foundIndex < 0)
                return -1;
            else
                return foundIndex + index;
        }

        /// <summary>
        /// Finds the index of the first item, in the range of <paramref name="count"/> items starting from <paramref name="index"/>, that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, -1 is returned.
        /// </summary>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <param name="index">The starting index of the range to check.</param>
        /// <param name="count">The number of items in range to check.</param>
        /// <returns>The index of the first item in the given range that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, -1 is returned.</returns>
        public virtual int FindIndex(int index, int count, Predicate<T> predicate)
        {
            int foundIndex = Algorithms.FindFirstIndexWhere<T>(Range(index, count), predicate);
            if (foundIndex < 0)
                return -1;
            else
                return foundIndex + index;
        }

        /// <summary>
        /// Finds the index of the last item in the list that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, -1 is returned.
        /// </summary>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <returns>The index of the last item that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, -1 is returned.</returns>
        public virtual int FindLastIndex(Predicate<T> predicate)
        {
            return Algorithms.FindLastIndexWhere<T>(this, predicate);
        }

        /// <summary>
        /// Finds the index of the last item, in the range of items extending from the beginning
        /// of the list to <paramref name="index"/>, that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, -1 is returned.
        /// </summary>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <param name="index">The ending index of the range to check.</param>
        /// <returns>The index of the last item in the given range that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, -1 is returned.</returns>
        public virtual int FindLastIndex(int index, Predicate<T> predicate)
        {
            return Algorithms.FindLastIndexWhere<T>(Range(0, index + 1), predicate);
        }

        /// <summary>
        /// Finds the index of the last item, in the range of <paramref name="count"/> items ending at <paramref name="index"/>, that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, -1 is returned.
        /// </summary>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <param name="index">The ending index of the range to check.</param>
        /// <param name="count">The number of items in range to check.</param>
        /// <returns>The index of the last item in the given range that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, -1 is returned.</returns>
        public virtual int FindLastIndex(int index, int count, Predicate<T> predicate)
        {
            int foundIndex = Algorithms.FindLastIndexWhere<T>(Range(index - count + 1, count), predicate);

            if (foundIndex >= 0)
                return foundIndex + index - count + 1;
            else
                return -1;
        }

        /// <summary>
        /// Finds the index of the first item in the list that is equal to <paramref name="item"/>.