QualifiedId.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / QualifiedId.cs / 1305376 / QualifiedId.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.Activities 
{
    using System; 
    using System.Collections.Generic; 
    using System.Runtime;
    using System.Text; 

    class QualifiedId : IEquatable
    {
        byte[] compressedId; 

        public QualifiedId(Activity element) 
        { 
            int bufferSize = 0;
 
            Stack ids = new Stack();

            int id = element.InternalId;
            bufferSize += GetEncodedSize(id); 
            ids.Push(id);
 
            IdSpace space = element.MemberOf; 

            while (space != null && space.ParentId != 0) 
            {
                bufferSize += GetEncodedSize(space.ParentId);
                ids.Push(space.ParentId);
 
                space = space.Parent;
            } 
 
            this.compressedId = new byte[bufferSize];
 
            int offset = 0;
            while (ids.Count > 0)
            {
                offset += Encode(ids.Pop(), this.compressedId, offset); 
            }
        } 
 
        public QualifiedId(byte[] bytes)
        { 
            this.compressedId = bytes;
        }

        public static bool TryGetElementFromRoot(Activity root, QualifiedId id, out Activity targetElement) 
        {
            return TryGetElementFromRoot(root, id.compressedId, out targetElement); 
        } 

        public static bool TryGetElementFromRoot(Activity root, byte[] idBytes, out Activity targetElement) 
        {
            Fx.Assert(root.MemberOf != null, "We need to have our IdSpaces set up for this to work.");

            Activity currentActivity = root; 
            IdSpace currentIdSpace = root.MemberOf;
 
            int offset = 0; 
            while (offset < idBytes.Length)
            { 
                int value;
                offset += Decode(idBytes, offset, out value);

                if (currentIdSpace == null) 
                {
                    targetElement = null; 
                    return false; 
                }
 
                currentActivity = currentIdSpace[value];

                if (currentActivity == null)
                { 
                    targetElement = null;
                    return false; 
                } 

                currentIdSpace = currentActivity.ParentOf; 
            }

            targetElement = currentActivity;
            return true; 
        }
 
        public static QualifiedId Parse(string value) 
        {
            QualifiedId result; 
            if (!TryParse(value, out result))
            {
                throw FxTrace.Exception.AsError(new FormatException(SR.InvalidActivityIdFormat));
            } 

            return result; 
        } 

        public static bool TryParse(string value, out QualifiedId result) 
        {
            Fx.Assert(!string.IsNullOrEmpty(value), "We should have already made sure it isn't null or empty.");

            string[] idStrings = value.Split('.'); 
            int[] ids = new int[idStrings.Length];
            int bufferSize = 0; 
 
            for (int i = 0; i < idStrings.Length; i++)
            { 
                // only support non-negative integers as id segments
                int parsedInt;
                if (!int.TryParse(idStrings[i], out parsedInt) || parsedInt < 0)
                { 
                    result = null;
                    return false; 
                } 

                ids[i] = parsedInt; 
                bufferSize += GetEncodedSize(ids[i]);
            }

            byte[] bytes = new byte[bufferSize]; 
            int offset = 0;
 
            for (int i = 0; i < ids.Length; i++) 
            {
                offset += Encode(ids[i], bytes, offset); 
            }

            result = new QualifiedId(bytes);
            return true; 
        }
 
        public static bool Equals(byte[] lhs, byte[] rhs) 
        {
            if (lhs.Length == rhs.Length) 
            {
                for (int i = 0; i < lhs.Length; i++)
                {
                    if (lhs[i] != rhs[i]) 
                    {
                        return false; 
                    } 
                }
 
                return true;
            }

            return false; 
        }
 
        public byte[] AsByteArray() 
        {
            // Note that we don't do a copy because we assume all users will 
            // treat it as immutable.
            return this.compressedId;
        }
 
        public bool Equals(QualifiedId rhs)
        { 
            return Equals(this.compressedId, rhs.compressedId); 
        }
 
        public override string ToString()
        {
            StringBuilder builder = new StringBuilder();
 
            bool needDot = false;
            int offset = 0; 
            while (offset < this.compressedId.Length) 
            {
                if (needDot) 
                {
                    builder.Append('.');
                }
 
                int value;
                offset += Decode(this.compressedId, offset, out value); 
 
                builder.Append(value);
 
                needDot = true;
            }

            return builder.ToString(); 
        }
 
        // This is the same Encode/Decode logic as the WCF FramingEncoder 
        static int Encode(int value, byte[] bytes, int offset)
        { 
            Fx.Assert(value >= 0, "Must be non-negative");

            int count = 1;
            while ((value & 0xFFFFFF80) != 0) 
            {
                bytes[offset++] = (byte)((value & 0x7F) | 0x80); 
                count++; 
                value >>= 7;
            } 
            bytes[offset] = (byte)value;
            return count;
        }
 
        // This is the same Encode/Decode logic as the WCF FramingEncoder
        static int Decode(byte[] buffer, int offset, out int value) 
        { 
            int bytesConsumed = 0;
            value = 0; 

            while (offset < buffer.Length)
            {
                int next = buffer[offset]; 
                value |= (next & 0x7F) << (bytesConsumed * 7);
                bytesConsumed++; 
                if ((next & 0x80) == 0) 
                {
                    break; 
                }
                offset++;
            }
 
            return bytesConsumed;
        } 
 
        static int GetEncodedSize(int value)
        { 
            Fx.Assert(value >= 0, "Must be non-negative");

            int count = 1;
            while ((value & 0xFFFFFF80) != 0) 
            {
                count++; 
                value >>= 7; 
            }
            return count; 
        }
    }
}
 


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

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