SequenceRangeCollection.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Channels / SequenceRangeCollection.cs / 1 / SequenceRangeCollection.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------
namespace System.ServiceModel.Channels
{ 
    using System.Collections;
    using System.Collections.Generic; 
    using System.Runtime.Serialization; 
    using System.Text;
    using System.ServiceModel; 

    abstract class SequenceRangeCollection
    {
        static EmptyRangeCollection empty = new EmptyRangeCollection(); 
        static LowerComparer lowerComparer = new LowerComparer();
        static UpperComparer upperComparer = new UpperComparer(); 
 
        public abstract SequenceRange this[int index] { get; }
        public abstract int Count { get; } 

        public static SequenceRangeCollection Empty
        {
            get 
            {
                return empty; 
            } 
        }
 
        public abstract bool Contains(Int64 number);

        public abstract SequenceRangeCollection MergeWith(Int64 number);
        public abstract SequenceRangeCollection MergeWith(SequenceRange range); 

        static SequenceRangeCollection GeneralCreate(SequenceRange[] sortedRanges) 
        { 
            if (sortedRanges.Length == 0)
            { 
                return empty;
            }
            else if (sortedRanges.Length == 1)
            { 
                return new SingleItemRangeCollection(sortedRanges[0]);
            } 
            else 
            {
                return new MultiItemRangeCollection(sortedRanges); 
            }
        }

        static SequenceRangeCollection GeneralMerge(SequenceRange[] sortedRanges, SequenceRange range) 
        {
            if (sortedRanges.Length == 0) 
            { 
                return new SingleItemRangeCollection(range);
            } 

            int lowerBound;

            if (sortedRanges.Length == 1) 
            {
                // Avoid performance hit of binary search in single range case 
                if (range.Lower == sortedRanges[0].Upper) 
                {
                    lowerBound = 0; 
                }
                else if (range.Lower < sortedRanges[0].Upper)
                {
                    lowerBound = ~0; 
                }
                else 
                { 
                    lowerBound = ~1;
                } 
            }
            else
            {
                lowerBound = Array.BinarySearch(sortedRanges, new SequenceRange(range.Lower), upperComparer); 
            }
 
            if (lowerBound < 0) 
            {
                lowerBound = ~lowerBound; 

                if ((lowerBound > 0) && (sortedRanges[lowerBound - 1].Upper == range.Lower - 1))
                {
                    lowerBound--; 
                }
 
                if (lowerBound == sortedRanges.Length) 
                {
                    SequenceRange[] returnedRanges = new SequenceRange[sortedRanges.Length + 1]; 
                    Array.Copy(sortedRanges, returnedRanges, sortedRanges.Length);
                    returnedRanges[sortedRanges.Length] = range;
                    return GeneralCreate(returnedRanges);
                } 
            }
 
            int upperBound; 

            if (sortedRanges.Length == 1) 
            {
                // Avoid performance hit of binary search in single range case
                if (range.Upper == sortedRanges[0].Lower)
                { 
                    upperBound = 0;
                } 
                else if (range.Upper < sortedRanges[0].Lower) 
                {
                    upperBound = ~0; 
                }
                else
                {
                    upperBound = ~1; 
                }
            } 
            else 
            {
                upperBound = Array.BinarySearch(sortedRanges, new SequenceRange(range.Upper), lowerComparer); 
            }

            if (upperBound < 0)
            { 
                upperBound = ~upperBound;
 
                if (upperBound > 0) 
                {
                    if ((upperBound == sortedRanges.Length) || (sortedRanges[upperBound].Lower != range.Upper + 1)) 
                    {
                        upperBound--;
                    }
                } 
                else if (sortedRanges[0].Lower > range.Upper + 1)
                { 
                    SequenceRange[] returnedRanges = new SequenceRange[sortedRanges.Length + 1]; 
                    Array.Copy(sortedRanges, 0, returnedRanges, 1, sortedRanges.Length);
                    returnedRanges[0] = range; 
                    return GeneralCreate(returnedRanges);
                }
            }
 
            Int64 newLower = (range.Lower < sortedRanges[lowerBound].Lower) ? range.Lower : sortedRanges[lowerBound].Lower;
            Int64 newUpper = (range.Upper > sortedRanges[upperBound].Upper) ? range.Upper : sortedRanges[upperBound].Upper; 
 
            int rangesRemoved = upperBound - lowerBound + 1;
            int rangesRemaining = sortedRanges.Length - rangesRemoved + 1; 
            if (rangesRemaining == 1)
            {
                return new SingleItemRangeCollection(newLower, newUpper);
            } 
            else
            { 
                SequenceRange[] returnedRanges = new SequenceRange[rangesRemaining]; 
                Array.Copy(sortedRanges, returnedRanges, lowerBound);
                returnedRanges[lowerBound] = new SequenceRange(newLower, newUpper); 
                Array.Copy(sortedRanges, upperBound + 1, returnedRanges, lowerBound + 1, sortedRanges.Length - upperBound - 1);
                return GeneralCreate(returnedRanges);
            }
        } 

        public override string ToString() 
        { 
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < Count; i++) 
            {
                SequenceRange range = this[i];
                if (i > 0)
                { 
                    builder.Append(',');
                } 
                builder.Append(range.Lower); 
                builder.Append('-');
                builder.Append(range.Upper); 
            }
            return builder.ToString();
        }
 
        class EmptyRangeCollection : SequenceRangeCollection
        { 
            public override SequenceRange this[int index] 
            {
                get 
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("index"));
                }
            } 

            public override int Count 
            { 
                get
                { 
                    return 0;
                }
            }
 
            public override bool Contains(Int64 number)
            { 
                return false; 
            }
 
            public override SequenceRangeCollection MergeWith(Int64 number)
            {
                return new SingleItemRangeCollection(number, number);
            } 

            public override SequenceRangeCollection MergeWith(SequenceRange range) 
            { 
                return new SingleItemRangeCollection(range);
            } 
        }

        class MultiItemRangeCollection : SequenceRangeCollection
        { 
            SequenceRange[] ranges;
 
            public MultiItemRangeCollection(SequenceRange[] sortedRanges) 
            {
                this.ranges = sortedRanges; 
            }

            public override SequenceRange this[int index]
            { 
                get
                { 
                    if (index < 0 || index >= ranges.Length) 
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("index", index,
                                                    SR.GetString(SR.ValueMustBeInRange, 0, ranges.Length - 1))); 
                    return this.ranges[index];
                }
            }
 
            public override int Count
            { 
                get 
                {
                    return this.ranges.Length; 
                }
            }

            public override bool Contains(Int64 number) 
            {
                if (this.ranges.Length == 0) 
                { 
                    return false;
                } 
                else if (this.ranges.Length == 1)
                {
                    return this.ranges[0].Contains(number);
                } 

                SequenceRange searchFor = new SequenceRange(number); 
                int searchValue = Array.BinarySearch(this.ranges, searchFor, lowerComparer); 

                if (searchValue >= 0) 
                {
                    return true;
                }
 
                searchValue = ~searchValue;
 
                if (searchValue == 0) 
                {
                    return false; 
                }

                return (this.ranges[searchValue - 1].Upper >= number);
            } 

            public override SequenceRangeCollection MergeWith(Int64 number) 
            { 
                return MergeWith(new SequenceRange(number));
            } 

            public override SequenceRangeCollection MergeWith(SequenceRange newRange)
            {
                return GeneralMerge(this.ranges, newRange); 
            }
        } 
 
        class SingleItemRangeCollection : SequenceRangeCollection
        { 
            SequenceRange range;

            public SingleItemRangeCollection(SequenceRange range)
            { 
                this.range = range;
            } 
 
            public SingleItemRangeCollection(Int64 lower, Int64 upper)
            { 
                this.range = new SequenceRange(lower, upper);
            }

            public override SequenceRange this[int index] 
            {
                get 
                { 
                    if (index != 0)
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("index")); 
                    return this.range;
                }
            }
 
            public override int Count
            { 
                get 
                {
                    return 1; 
                }
            }

            public override bool Contains(Int64 number) 
            {
                return this.range.Contains(number); 
            } 

            public override SequenceRangeCollection MergeWith(Int64 number) 
            {
                if (number == this.range.Upper + 1)
                {
                    return new SingleItemRangeCollection(range.Lower, number); 
                }
                else 
                { 
                    return MergeWith(new SequenceRange(number));
                } 
            }

            public override SequenceRangeCollection MergeWith(SequenceRange newRange)
            { 
                if (newRange.Lower == this.range.Upper + 1)
                { 
                    return new SingleItemRangeCollection(range.Lower, newRange.Upper); 
                }
                else if (this.range.Contains(newRange)) 
                {
                    return this;
                }
                else if (newRange.Contains(this.range)) 
                {
                    return new SingleItemRangeCollection(newRange); 
                } 
                else if (newRange.Upper == this.range.Lower - 1)
                { 
                    return new SingleItemRangeCollection(newRange.Lower, this.range.Upper);
                }
                else
                { 
                    return GeneralMerge(new SequenceRange[] { this.range }, newRange);
                } 
            } 
        }
 
        class LowerComparer : IComparer
        {
            public int Compare(SequenceRange x, SequenceRange y)
            { 
                if (x.Lower < y.Lower)
                { 
                    return -1; 
                }
                else if (x.Lower > y.Lower) 
                {
                    return 1;
                }
                else 
                {
                    return 0; 
                } 
            }
        } 

        class UpperComparer : IComparer
        {
            public int Compare(SequenceRange x, SequenceRange y) 
            {
                if (x.Upper < y.Upper) 
                { 
                    return -1;
                } 
                else if (x.Upper > y.Upper)
                {
                    return 1;
                } 
                else
                { 
                    return 0; 
                }
            } 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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