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//-----------------------------------------------------------------------------
// 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<QualifiedId>
{
byte[] compressedId;
public QualifiedId(Activity element)
{
int bufferSize = 0;
Stack<int> ids = new Stack<int>();
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 QualifiedId(int[] idArray)
{
int bufferSize = 0;
for (int i = 0; i < idArray.Length; i++)
{
bufferSize += GetEncodedSize(idArray[i]);
}
this.compressedId = new byte[bufferSize];
int offset = 0;
for (int i = 0; i < idArray.Length; i++)
{
offset += Encode(idArray[i], this.compressedId, offset);
}
}
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 int[] AsIDArray()
{
List<int> tmpList = new List<int>();
int offset = 0;
while (offset < this.compressedId.Length)
{
int value;
offset += Decode(this.compressedId, offset, out value);
tmpList.Add(value);
}
return tmpList.ToArray();
}
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;
}
}
}
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