ListBase.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / ListBase.cs / 1 / ListBase.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
using System; 
using System.Xml; 
using System.Xml.Schema;
using System.Collections.Generic; 
using System.Diagnostics;
using System.Text;

namespace System.Xml { 

    ///  
    /// Implementation of read-only IList and IList interfaces.  Derived classes can inherit from 
    /// this class and implement only two methods, Count and Item, rather than the entire IList interface.
    ///  
    internal abstract class ListBase : IList, System.Collections.IList {
        //-----------------------------------------------
        // Abstract IList methods that must be
        // implemented by derived classes 
        //-----------------------------------------------
        public abstract int Count { get; } 
        public abstract T this[int index] { get; set; } 

 
        //-----------------------------------------------
        // Implemented by base class -- accessible on
        // ListBase
        //----------------------------------------------- 
        public virtual bool Contains(T value) {
            return IndexOf(value) != -1; 
        } 

        public virtual int IndexOf(T value) { 
            for (int i = 0; i < Count; i++)
                if (value.Equals(this[i]))
                    return i;
 
            return -1;
        } 
 
        public virtual void CopyTo(T[] array, int index) {
            for (int i = 0; i < Count; i++) 
                array[index + i] = this[i];
        }

        public virtual IListEnumerator GetEnumerator() { 
            return new IListEnumerator(this);
        } 
 
        public virtual bool IsFixedSize {
            get { return true; } 
        }

        public virtual bool IsReadOnly {
            get { return true; } 
        }
 
        public virtual void Add(T value) { 
            Insert(Count, value);
        } 

        public virtual void Insert(int index, T value) {
            throw new NotSupportedException();
        } 

        public virtual bool Remove(T value) { 
            int index = IndexOf(value); 
            if (index >= 0) {
                RemoveAt(index); 
                return true;
            }
            return false;
        } 

        public virtual void RemoveAt(int index) { 
            throw new NotSupportedException(); 
        }
 
        public virtual void Clear() {
            for (int index = Count - 1; index >= 0; index--)
                RemoveAt(index);
        } 

 
        //----------------------------------------------- 
        // Implemented by base class -- only accessible
        // after casting to IList 
        //-----------------------------------------------
        IEnumerator IEnumerable.GetEnumerator() {
            return new IListEnumerator(this);
        } 

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { 
            return new IListEnumerator(this); 
        }
 
        bool System.Collections.ICollection.IsSynchronized {
            get { return IsReadOnly; }
        }
 
        object System.Collections.ICollection.SyncRoot {
            get { return this; } 
        } 

        void System.Collections.ICollection.CopyTo(Array array, int index) { 
            for (int i = 0; i < Count; i++)
                array.SetValue(this[i], index);
        }
 
        object System.Collections.IList.this[int index] {
            get { return this[index]; } 
            set { 
                if (!IsCompatibleType(value.GetType()))
                    throw new ArgumentException(); 

                this[index] = (T) value;
            }
        } 

        int System.Collections.IList.Add(object value) { 
            if (!IsCompatibleType(value.GetType())) 
                throw new ArgumentException();
 
            Add((T) value);
            return Count - 1;
        }
 
        void System.Collections.IList.Clear() {
            Clear(); 
        } 

        bool System.Collections.IList.Contains(object value) { 
            if (!IsCompatibleType(value.GetType()))
                return false;

            return Contains((T) value); 
        }
 
        int System.Collections.IList.IndexOf(object value) { 
            if (!IsCompatibleType(value.GetType()))
                return -1; 

            return IndexOf((T) value);
        }
 
        void System.Collections.IList.Insert(int index, object value) {
            if (!IsCompatibleType(value.GetType())) 
                throw new ArgumentException(); 

            Insert(index, (T) value); 
        }

        void System.Collections.IList.Remove(object value) {
            if (!IsCompatibleType(value.GetType())) 
                throw new ArgumentException();
 
            Remove((T) value); 
        }
 

        //-----------------------------------------------
        // Helper methods and classes
        //----------------------------------------------- 

        private static bool IsCompatibleType(object value) { 
            if((value == null && !typeof(T).IsValueType) || (value is T)) 
                return true;
 
            return false;
        }
    }
 
    /// 
    /// Implementation of IEnumerator and IEnumerator over an IList. 
    ///  
    internal struct IListEnumerator : IEnumerator, System.Collections.IEnumerator {
        private IList sequence; 
        private int index;
        private T current;

        ///  
        /// Constructor.
        ///  
        public IListEnumerator(IList sequence) { 
            this.sequence = sequence;
            this.index = 0; 
            this.current = default(T);
        }

        ///  
        /// No-op.
        ///  
        public void Dispose() { 
        }
 
        /// 
        /// Return current item.  Return default value if before first item or after last item in the list.
        /// 
        public T Current { 
            get { return this.current; }
        } 
 
        /// 
        /// Return current item.  Throw exception if before first item or after last item in the list. 
        /// 
        object System.Collections.IEnumerator.Current {
            get {
                if (this.index == 0) 
                    throw new InvalidOperationException(Res.GetString(Res.Sch_EnumNotStarted, string.Empty));
 
                if (this.index > this.sequence.Count) 
                    throw new InvalidOperationException(Res.GetString(Res.Sch_EnumFinished, string.Empty));
 
                return this.current;
            }
        }
 
        /// 
        /// Advance enumerator to next item in list.  Return false if there are no more items. 
        ///  
        public bool MoveNext() {
            if (this.index < this.sequence.Count) { 
                this.current = this.sequence[this.index];
                this.index++;
                return true;
            } 

            this.current = default(T); 
            return false; 
        }
 
        /// 
        /// Set the enumerator to its initial position, which is before the first item in the list.
        /// 
        void System.Collections.IEnumerator.Reset() { 
            this.index = 0;
            this.current = default(T); 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ListBase.cs source code in C# .NET

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