SequenceNumber.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / Log / System / IO / Log / SequenceNumber.cs / 1305376 / SequenceNumber.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
namespace System.IO.Log
{ 
    // Add property for sequence number size
    using System; 
    using System.Collections.Generic; 

    [Serializable] 
    public struct SequenceNumber : IComparable
    {
        ulong sequenceNumberHigh;
        ulong sequenceNumberLow; 

        public SequenceNumber(byte[] sequenceNumber) 
        { 
            if(sequenceNumber == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentNull("sequenceNumber"));
            }

            if ((sequenceNumber.Length != 8) && 
                (sequenceNumber.Length != 16))
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentInvalid(SR.Argument_SequenceNumberLength)); 
            }
 
            this.sequenceNumberHigh = BitConverter.ToUInt64(sequenceNumber, 0);
            if (sequenceNumber.Length > 8)
            {
                this.sequenceNumberLow = BitConverter.ToUInt64(sequenceNumber, 8); 
            }
            else 
            { 
                this.sequenceNumberLow = 0;
            } 
        }

        internal SequenceNumber(ulong value)
        { 
            this.sequenceNumberHigh = value;
 
            // Ensure that SequenceNumber.Invalid round-trips. 
            //
            if (value == UInt64.MaxValue) 
            {
                this.sequenceNumberLow = UInt64.MaxValue;
            }
            else 
            {
                this.sequenceNumberLow = 0; 
            } 
        }
 
        internal SequenceNumber(ulong high, ulong low)
        {
            this.sequenceNumberHigh = high;
            this.sequenceNumberLow = low; 
        }
 
        internal ulong High { get { return this.sequenceNumberHigh; } } 
        internal ulong Low { get { return this.sequenceNumberLow; } }
 
        public static SequenceNumber Invalid
        {
            get
            { 
                return new SequenceNumber(UInt64.MaxValue, UInt64.MaxValue);
            } 
        } 

        public static bool operator !=( 
            SequenceNumber c1,
            SequenceNumber c2)
        {
            return (c1.CompareTo(c2) != 0); 
        }
 
        public static bool operator <( 
            SequenceNumber c1,
            SequenceNumber c2) 
        {
            return (c1.CompareTo(c2) < 0);
        }
 
        public static bool operator <=(SequenceNumber c1,
            SequenceNumber c2) 
        { 
            return (c1.CompareTo(c2) <= 0);
        } 

        public static bool operator ==(
            SequenceNumber c1,
            SequenceNumber c2) 
        {
            return (c1.CompareTo(c2) == 0); 
        } 

        public static bool operator >( 
            SequenceNumber c1,
            SequenceNumber c2)
        {
            return (c1.CompareTo(c2) > 0); 
        }
 
        public static bool operator >=( 
            SequenceNumber c1,
            SequenceNumber c2) 
        {
            return (c1.CompareTo(c2) >= 0);
        }
 
        public int CompareTo(SequenceNumber other)
        { 
            int result = this.sequenceNumberHigh.CompareTo(other.sequenceNumberHigh); 
            if (result == 0)
                result = this.sequenceNumberLow.CompareTo(other.sequenceNumberLow); 

            return result;
        }
 
        public bool Equals(SequenceNumber other)
        { 
            return (this.CompareTo(other) == 0); 
        }
 
        public override bool Equals(object other)
        {
            if (!(other is SequenceNumber))
                return false; 

            SequenceNumber otherSeq = (SequenceNumber)(other); 
            return this.Equals(otherSeq); 
        }
 
        public byte[] GetBytes()
        {
            byte[] bytes;
 
            if (this.sequenceNumberLow == 0)
            { 
                bytes = new byte[8]; 
                WriteUInt64(this.sequenceNumberHigh, bytes, 0);
            } 
            else
            {
                bytes = new byte[16];
                WriteUInt64(this.sequenceNumberHigh, bytes, 0); 
                WriteUInt64(this.sequenceNumberLow, bytes, 8);
            } 
 
            return bytes;
        } 

        public override int GetHashCode()
        {
            return 
                this.sequenceNumberHigh.GetHashCode() ^
                this.sequenceNumberLow.GetHashCode(); 
        } 

        internal static void WriteUInt64(ulong value, byte[] bits, int offset) 
        {
            bits[offset + 0] = (byte)((value >> 0) & 0xFF);
            bits[offset + 1] = (byte)((value >> 8) & 0xFF);
            bits[offset + 2] = (byte)((value >> 16) & 0xFF); 
            bits[offset + 3] = (byte)((value >> 24) & 0xFF);
            bits[offset + 4] = (byte)((value >> 32) & 0xFF); 
            bits[offset + 5] = (byte)((value >> 40) & 0xFF); 
            bits[offset + 6] = (byte)((value >> 48) & 0xFF);
            bits[offset + 7] = (byte)((value >> 56) & 0xFF); 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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SequenceNumber.cs source code in C# .NET

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