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How to use GetOrCreateNode method of Microsoft.Coyote.Actors.Coverage.ActorRuntimeLogGraphBuilder class

Best Coyote code snippet using Microsoft.Coyote.Actors.Coverage.ActorRuntimeLogGraphBuilder.GetOrCreateNode
ActorRuntimeLogGraphBuilder.cs
Source:ActorRuntimeLogGraphBuilder.cs
...95        {96            lock (this.Inbox)97            {98                var resolvedId = this.GetResolveActorId(id?.Name, id?.Type);99                GraphNode node = this.Graph.GetOrCreateNode(resolvedId);100                node.Category = ActorCategory;101                if (!string.IsNullOrEmpty(creatorName))102                {103                    var creatorId = this.GetResolveActorId(creatorName, creatorType);104                    GraphNode creator = this.Graph.GetOrCreateNode(creatorId);105                    this.GetOrCreateEventLink(creator, node, new EventInfo() { Event = "CreateActor" });106                }107            }108        }109        /// <inheritdoc/>110        public void OnCreateStateMachine(ActorId id, string creatorName, string creatorType)111        {112            lock (this.Inbox)113            {114                var resolvedId = this.GetResolveActorId(id?.Name, id?.Type);115                GraphNode node = this.Graph.GetOrCreateNode(resolvedId);116                node.Category = StateMachineCategory;117                if (!string.IsNullOrEmpty(creatorName))118                {119                    var creatorId = this.GetResolveActorId(creatorName, creatorType);120                    GraphNode creator = this.Graph.GetOrCreateNode(creatorId);121                    this.GetOrCreateEventLink(creator, node, new EventInfo() { Event = "CreateActor" });122                }123            }124        }125        /// <inheritdoc/>126        public void OnSendEvent(ActorId targetActorId, string senderName, string senderType, string senderStateName,127            Event e, Guid eventGroupId, bool isTargetHalted)128        {129            string eventName = e.GetType().FullName;130            this.AddEvent(targetActorId.Name, targetActorId.Type, senderName, senderType, senderStateName, eventName);131        }132        /// <inheritdoc/>133        public void OnRaiseEvent(ActorId id, string stateName, Event e)134        {135            string eventName = e.GetType().FullName;136            // Raising event to self.137            this.AddEvent(id.Name, id.Type, id.Name, id.Type, stateName, eventName);138        }139        /// <inheritdoc/>140        public void OnEnqueueEvent(ActorId id, Event e)141        {142        }143        /// <inheritdoc/>144        public void OnDequeueEvent(ActorId id, string stateName, Event e)145        {146            lock (this.Inbox)147            {148                var resolvedId = this.GetResolveActorId(id?.Name, id?.Type);149                string eventName = e.GetType().FullName;150                EventInfo info = this.PopEvent(resolvedId, eventName);151                if (info != null)152                {153                    this.Dequeued[id] = info;154                }155            }156        }157        private EventInfo PopEvent(string resolvedId, string eventName)158        {159            EventInfo result = null;160            lock (this.Inbox)161            {162                if (this.Inbox.TryGetValue(resolvedId, out List<EventInfo> inbox))163                {164                    for (int i = inbox.Count - 1; i >= 0; i--)165                    {166                        if (inbox[i].Event == eventName)167                        {168                            result = inbox[i];169                            inbox.RemoveAt(i);170                        }171                    }172                }173            }174            return result;175        }176        /// <inheritdoc/>177        public void OnReceiveEvent(ActorId id, string stateName, Event e, bool wasBlocked)178        {179            string resolvedId = this.GetResolveActorId(id?.Name, id?.Type);180            lock (this.Inbox)181            {182                if (this.Inbox.TryGetValue(resolvedId, out List<EventInfo> inbox))183                {184                    string eventName = e.GetType().FullName;185                    for (int i = inbox.Count - 1; i >= 0; i--)186                    {187                        EventInfo info = inbox[i];188                        if (info.Event == eventName)189                        {190                            // Yay, found it so we can draw the complete link connecting the Sender state to this state!191                            string category = string.IsNullOrEmpty(stateName) ? ActorCategory : StateMachineCategory;192                            var source = this.GetOrCreateChild(info.Name, info.Type, info.State);193                            var target = this.GetOrCreateChild(id?.Name, id?.Type, category, stateName);194                            this.GetOrCreateEventLink(source, target, info);195                            inbox.RemoveAt(i);196                            break;197                        }198                    }199                }200            }201        }202        /// <inheritdoc/>203        public void OnWaitEvent(ActorId id, string stateName, Type eventType)204        {205        }206        /// <inheritdoc/>207        public void OnWaitEvent(ActorId id, string stateName, params Type[] eventTypes)208        {209        }210        /// <inheritdoc/>211        public void OnStateTransition(ActorId id, string stateName, bool isEntry)212        {213            if (isEntry)214            {215                // record the fact we have entered this state216                this.GetOrCreateChild(id?.Name, id?.Type, stateName);217            }218        }219        /// <inheritdoc/>220        public void OnExecuteAction(ActorId id, string handlingStateName, string currentStateName, string actionName)221        {222            this.LinkTransition(typeof(DoActionEvent), id, handlingStateName, currentStateName, null);223        }224        /// <inheritdoc/>225        public void OnGotoState(ActorId id, string currentStateName, string newStateName)226        {227            this.LinkTransition(typeof(GotoStateEvent), id, currentStateName, currentStateName, newStateName);228        }229        /// <inheritdoc/>230        public void OnPushState(ActorId id, string currentStateName, string newStateName)231        {232            this.LinkTransition(typeof(PushStateEvent), id, currentStateName, currentStateName, newStateName);233        }234        /// <inheritdoc/>235        public void OnPopState(ActorId id, string currentStateName, string restoredStateName)236        {237            if (!string.IsNullOrEmpty(currentStateName))238            {239                this.LinkTransition(typeof(PopStateEvent), id, currentStateName,240                    currentStateName, restoredStateName);241            }242        }243        /// <inheritdoc/>244        public void OnHalt(ActorId id, int inboxSize)245        {246            lock (this.Inbox)247            {248                this.HaltedStates.TryGetValue(id, out string stateName);249                var target = this.GetOrCreateChild(id?.Name, id?.Type, "Halt", "Halt");250                // Transition to the Halt state.251                if (!string.IsNullOrEmpty(stateName))252                {253                    var source = this.GetOrCreateChild(id?.Name, id?.Type, stateName);254                    this.GetOrCreateEventLink(source, target, new EventInfo() { Event = typeof(HaltEvent).FullName });255                }256            }257        }258        private int? GetLinkIndex(GraphNode source, GraphNode target, string id)259        {260            if (this.MergeEventLinks)261            {262                return null;263            }264            return this.Graph.GetUniqueLinkIndex(source, target, id);265        }266        /// <inheritdoc/>267        public void OnDefaultEventHandler(ActorId id, string stateName)268        {269            lock (this.Inbox)270            {271                string resolvedId = this.GetResolveActorId(id?.Name, id?.Type);272                string eventName = typeof(DefaultEvent).FullName;273                this.AddEvent(id.Name, id.Type, id.Name, id.Type, stateName, eventName);274                this.Dequeued[id] = this.PopEvent(resolvedId, eventName);275            }276        }277        /// <inheritdoc/>278        public void OnHandleRaisedEvent(ActorId id, string stateName, Event e)279        {280            lock (this.Inbox)281            {282                // We used the inbox to store raised event, but it should be the first one handled since283                // raised events are highest priority.284                string resolvedId = this.GetResolveActorId(id?.Name, id?.Type);285                lock (this.Inbox)286                {287                    if (this.Inbox.TryGetValue(resolvedId, out List<EventInfo> inbox))288                    {289                        string eventName = e.GetType().FullName;290                        for (int i = inbox.Count - 1; i >= 0; i--)291                        {292                            EventInfo info = inbox[i];293                            if (info.Event == eventName)294                            {295                                this.Dequeued[id] = info;296                                break;297                            }298                        }299                    }300                }301            }302        }303        /// <inheritdoc/>304        public void OnPopStateUnhandledEvent(ActorId actorId, string currentStateName, Event e)305        {306            lock (this.Inbox)307            {308                if (e is HaltEvent)309                {310                    this.HaltedStates[actorId] = currentStateName;311                }312            }313        }314        /// <inheritdoc/>315        public void OnExceptionThrown(ActorId id, string stateName, string actionName, Exception ex)316        {317        }318        /// <inheritdoc/>319        public void OnExceptionHandled(ActorId id, string stateName, string actionName, Exception ex)320        {321        }322        /// <inheritdoc/>323        public void OnCreateTimer(TimerInfo info)324        {325            // TODO: figure out how to graph timers when we have no "timer id" at this point...326        }327        /// <inheritdoc/>328        public void OnStopTimer(TimerInfo info)329        {330        }331        /// <inheritdoc/>332        public void OnCreateMonitor(string monitorType)333        {334            lock (this.Inbox)335            {336                GraphNode node = this.Graph.GetOrCreateNode(monitorType, monitorType);337                node.Category = MonitorCategory;338            }339        }340        /// <inheritdoc/>341        public void OnMonitorExecuteAction(string monitorType, string stateName, string actionName)342        {343            // Monitors process actions immediately, so this state transition is a result of the only event in the inbox.344            lock (this.Inbox)345            {346                if (this.Inbox.TryGetValue(monitorType, out List<EventInfo> inbox) && inbox.Count > 0)347                {348                    var e = inbox[inbox.Count - 1];349                    inbox.RemoveAt(inbox.Count - 1);350                    // Draw the link connecting the Sender state to this state!351                    var source = this.GetOrCreateChild(e.Name, e.Type, e.State);352                    var target = this.GetOrCreateChild(monitorType, monitorType, stateName);353                    this.GetOrCreateEventLink(source, target, e);354                }355            }356        }357        /// <inheritdoc/>358        public void OnMonitorProcessEvent(string monitorType, string stateName, string senderName, string senderType,359            string senderStateName, Event e)360        {361            lock (this.Inbox)362            {363                string eventName = e.GetType().FullName;364                // Now add a fake event for internal monitor state transition that might now happen as a result of this event,365                // storing the monitor's current state in this event.366                var info = this.AddEvent(monitorType, monitorType, monitorType, monitorType, stateName, eventName);367                // Draw the link connecting the Sender state to this state!368                var source = this.GetOrCreateChild(senderName, senderType, senderStateName);369                var target = this.GetOrCreateChild(monitorType, monitorType, stateName);370                this.GetOrCreateEventLink(source, target, info);371            }372        }373        /// <inheritdoc/>374        public void OnMonitorRaiseEvent(string monitorType, string stateName, Event e)375        {376            // Raising event to self.377            string eventName = e.GetType().FullName;378            this.AddEvent(monitorType, monitorType, monitorType, monitorType, stateName, eventName);379        }380        /// <inheritdoc/>381        public void OnMonitorStateTransition(string monitorType, string stateName, bool isEntry, bool? isInHotState)382        {383            if (isEntry)384            {385                lock (this.Inbox)386                {387                    // Monitors process events immediately (and does not call OnDequeue), so this state transition is a result of388                    // the fake event we created in OnMonitorProcessEvent.389                    if (this.Inbox.TryGetValue(monitorType, out List<EventInfo> inbox) && inbox.Count > 0)390                    {391                        var info = inbox[inbox.Count - 1];392                        inbox.RemoveAt(inbox.Count - 1);393                        // draw the link connecting the current state to this new state!394                        var source = this.GetOrCreateChild(monitorType, monitorType, info.State);395                        var shortStateName = this.GetLabel(monitorType, monitorType, stateName);396                        string suffix = string.Empty;397                        if (isInHotState.HasValue)398                        {399                            suffix = (isInHotState is true) ? "[hot]" : "[cold]";400                            shortStateName += suffix;401                        }402                        string label = shortStateName;403                        var target = this.GetOrCreateChild(monitorType, monitorType, shortStateName, label);404                        // In case this node was already created, we may need to override the label here now that405                        // we know this is a hot state. This is because, unfortunately, other OnMonitor* methods406                        // do not provide the isInHotState parameter.407                        target.Label = label;408                        this.GetOrCreateEventLink(source, target, info);409                    }410                }411            }412        }413        /// <inheritdoc/>414        public void OnMonitorError(string monitorType, string stateName, bool? isInHotState)415        {416            var source = this.GetOrCreateChild(monitorType, monitorType, stateName);417            source.Category = "Error";418        }419        /// <inheritdoc/>420        public void OnRandom(object result, string callerName, string callerType)421        {422        }423        /// <inheritdoc/>424        public void OnAssertionFailure(string error)425        {426        }427        /// <inheritdoc/>428        public void OnStrategyDescription(string strategyName, string description)429        {430        }431        /// <inheritdoc/>432        public void OnCompleted()433        {434        }435        /// <summary>436        /// Return current graph and reset for next iteration.437        /// </summary>438        /// <param name="reset">Set to true will reset the graph for the next iteration.</param>439        /// <returns>The graph.</returns>440        public Graph SnapshotGraph(bool reset)441        {442            Graph result = this.CurrentGraph;443            if (reset)444            {445                // start fresh.446                this.CurrentGraph = null;447            }448            return result;449        }450        private string GetResolveActorId(string name, string type)451        {452            if (type is null)453            {454                // The sender id can be null if an event is fired from non-actor code.455                return ExternalCodeName;456            }457            if (this.CollapseMachineInstances)458            {459                return type;460            }461            return name;462        }463        private EventInfo AddEvent(string targetName, string targetType, string senderName, string senderType,464            string senderStateName, string eventName)465        {466            string targetId = this.GetResolveActorId(targetName, targetType);467            EventInfo info = null;468            lock (this.Inbox)469            {470                if (!this.Inbox.TryGetValue(targetId, out List<EventInfo> inbox))471                {472                    inbox = new List<EventInfo>();473                    this.Inbox[targetId] = inbox;474                }475                info = new EventInfo()476                {477                    Name = senderName ?? ExternalCodeName,478                    Type = senderType ?? ExternalCodeName,479                    State = senderStateName,480                    Event = eventName481                };482                inbox.Add(info);483            }484            return info;485        }486        private void LinkTransition(Type transitionType, ActorId id, string handlingStateName,487            string currentStateName, string newStateName)488        {489            string name = id.Name;490            string type = id.Type;491            lock (this.Inbox)492            {493                if (this.Dequeued.TryGetValue(id, out EventInfo info))494                {495                    // Event was dequeued, but now we know what state is handling this event, so connect the dots...496                    if (info.Type != type || info.Name != name || info.State != currentStateName)497                    {498                        var source = this.GetOrCreateChild(info.Name, info.Type, info.State);499                        var target = this.GetOrCreateChild(name, type, currentStateName);500                        info.HandlingState = handlingStateName;501                        this.GetOrCreateEventLink(source, target, info);502                    }503                }504                if (newStateName != null)505                {506                    // Then this is a goto or push and we can draw that link also.507                    var source = this.GetOrCreateChild(name, type, currentStateName);508                    var target = this.GetOrCreateChild(name, type, newStateName);509                    if (info is null)510                    {511                        info = new EventInfo { Event = transitionType.FullName };512                    }513                    this.GetOrCreateEventLink(source, target, info);514                }515                this.Dequeued.Remove(id);516            }517        }518        private GraphNode GetOrCreateChild(string name, string type, string stateName, string label = null)519        {520            GraphNode child = null;521            lock (this.Inbox)522            {523                this.AddNamespace(type);524                var initalStateName = stateName;525                // make label relative to fully qualified actor id (it's usually a nested class).526                stateName = this.GetLabel(name, type, stateName);527                string id = this.GetResolveActorId(name, type);528                GraphNode parent = this.Graph.GetOrCreateNode(id);529                parent.AddAttribute("Group", "Expanded");530                if (string.IsNullOrEmpty(label))531                {532                    label = stateName ?? ExternalStateName;533                }534                if (!string.IsNullOrEmpty(stateName))535                {536                    id += "." + stateName;537                }538                child = this.Graph.GetOrCreateNode(id, label);539                this.Graph.GetOrCreateLink(parent, child, null, null, "Contains");540            }541            return child;542        }543        private GraphLink GetOrCreateEventLink(GraphNode source, GraphNode target, EventInfo e)544        {545            GraphLink link = null;546            lock (this.Inbox)547            {548                string label = this.GetEventLabel(e.Event);549                var index = this.GetLinkIndex(source, target, label);550                var category = GetEventCategory(e.Event);551                link = this.Graph.GetOrCreateLink(source, target, index, label, category);552                if (this.MergeEventLinks)553                {554                    if (link.AddListAttribute("EventIds", e.Event) > 1)555                    {556                        link.Label = "*";557                    }558                }559                else560                {561                    if (e.Event != null)562                    {563                        link.AddAttribute("EventId", e.Event);564                    }565                    if (e.HandlingState != null)566                    {567                        link.AddAttribute("HandledBy", e.HandlingState);568                    }569                }570            }571            return link;572        }573        private void AddNamespace(string type)574        {575            if (type != null && !this.Namespaces.Contains(type))576            {577                string typeName = type;578                int index = typeName.Length;579                do580                {581                    typeName = typeName.Substring(0, index);582                    this.Namespaces.Add(typeName);583                    index = typeName.LastIndexOfAny(TypeSeparators);584                }585                while (index > 0);586            }587        }588        private string GetLabel(string name, string type, string fullyQualifiedName)589        {590            if (type is null)591            {592                // external code593                return fullyQualifiedName;594            }595            this.AddNamespace(type);596            if (string.IsNullOrEmpty(fullyQualifiedName))597            {598                // then this is probably an Actor, not a StateMachine.  For Actors we can invent a state599                // name equal to the short name of the class, this then looks like a Constructor which is fine.600                fullyQualifiedName = this.CollapseMachineInstances ? type : name;601            }602            var len = fullyQualifiedName.Length;603            var index = fullyQualifiedName.LastIndexOfAny(TypeSeparators);604            if (index > 0)605            {606                fullyQualifiedName = fullyQualifiedName.Substring(index).Trim('+').Trim('.');607            }608            return fullyQualifiedName;609        }610        private string GetEventLabel(string fullyQualifiedName)611        {612            if (EventAliases.TryGetValue(fullyQualifiedName, out string label))613            {614                return label;615            }616            int i = fullyQualifiedName.LastIndexOfAny(TypeSeparators);617            if (i > 0)618            {619                string ns = fullyQualifiedName.Substring(0, i);620                if (this.Namespaces.Contains(ns))621                {622                    return fullyQualifiedName.Substring(i + 1);623                }624            }625            return fullyQualifiedName;626        }627        private static string GetEventCategory(string fullyQualifiedName)628        {629            if (EventAliases.TryGetValue(fullyQualifiedName, out string label))630            {631                return label;632            }633            return null;634        }635    }636    /// <summary>637    /// A directed graph made up of Nodes and Links.638    /// </summary>639    [DataContract]640    public class Graph641    {642        internal const string DgmlNamespace = "http://schemas.microsoft.com/vs/2009/dgml";643        // These [DataMember] fields are here so we can serialize the Graph across parallel or distributed644        // test processes without losing any information.  There is more information here than in the serialized645        // DGML which is we we can't just use Save/LoadDgml to do the same.646        [DataMember]647        private readonly Dictionary<string, GraphNode> InternalNodes = new Dictionary<string, GraphNode>();648        [DataMember]649        private readonly Dictionary<string, GraphLink> InternalLinks = new Dictionary<string, GraphLink>();650        // last used index for simple link key "a->b".651        [DataMember]652        private readonly Dictionary<string, int> InternalNextLinkIndex = new Dictionary<string, int>();653        // maps augmented link key to the index that has been allocated for that link id "a->b(goto)" => 0654        [DataMember]655        private readonly Dictionary<string, int> InternalAllocatedLinkIndexes = new Dictionary<string, int>();656        [DataMember]657        private readonly Dictionary<string, string> InternalAllocatedLinkIds = new Dictionary<string, string>();658        /// <summary>659        /// Return the current list of nodes (in no particular order).660        /// </summary>661        public IEnumerable<GraphNode> Nodes662        {663            get { return this.InternalNodes.Values; }664        }665        /// <summary>666        /// Return the current list of links (in no particular order).667        /// </summary>668        public IEnumerable<GraphLink> Links669        {670            get671            {672                if (this.InternalLinks is null)673                {674                    return Array.Empty<GraphLink>();675                }676                return this.InternalLinks.Values;677            }678        }679        /// <summary>680        /// Get existing node or null.681        /// </summary>682        /// <param name="id">The id of the node.</param>683        public GraphNode GetNode(string id)684        {685            this.InternalNodes.TryGetValue(id, out GraphNode node);686            return node;687        }688        /// <summary>689        /// Get existing node or create a new one with the given id and label.690        /// </summary>691        /// <returns>Returns the new node or the existing node if it was already defined.</returns>692        public GraphNode GetOrCreateNode(string id, string label = null, string category = null)693        {694            if (!this.InternalNodes.TryGetValue(id, out GraphNode node))695            {696                node = new GraphNode(id, label, category);697                this.InternalNodes.Add(id, node);698            }699            return node;700        }701        /// <summary>702        /// Get existing node or create a new one with the given id and label.703        /// </summary>704        /// <returns>Returns the new node or the existing node if it was already defined.</returns>705        private GraphNode GetOrCreateNode(GraphNode newNode)706        {707            if (!this.InternalNodes.ContainsKey(newNode.Id))708            {709                this.InternalNodes.Add(newNode.Id, newNode);710            }711            return newNode;712        }713        /// <summary>714        /// Get existing link or create a new one connecting the given source and target nodes.715        /// </summary>716        /// <returns>The new link or the existing link if it was already defined.</returns>717        public GraphLink GetOrCreateLink(GraphNode source, GraphNode target, int? index = null, string linkLabel = null, string category = null)718        {719            string key = source.Id + "->" + target.Id;720            if (index.HasValue)721            {722                key += string.Format("({0})", index.Value);723            }724            if (!this.InternalLinks.TryGetValue(key, out GraphLink link))725            {726                link = new GraphLink(source, target, linkLabel, category);727                if (index.HasValue)728                {729                    link.Index = index.Value;730                }731                this.InternalLinks.Add(key, link);732            }733            return link;734        }735        internal int GetUniqueLinkIndex(GraphNode source, GraphNode target, string id)736        {737            // augmented key738            string key = string.Format("{0}->{1}({2})", source.Id, target.Id, id);739            if (this.InternalAllocatedLinkIndexes.TryGetValue(key, out int index))740            {741                return index;742            }743            // allocate a new index for the simple key744            var simpleKey = string.Format("{0}->{1}", source.Id, target.Id);745            if (this.InternalNextLinkIndex.TryGetValue(simpleKey, out index))746            {747                index++;748            }749            this.InternalNextLinkIndex[simpleKey] = index;750            // remember this index has been allocated for this link id.751            this.InternalAllocatedLinkIndexes[key] = index;752            // remember the original id associated with this link index.753            key = string.Format("{0}->{1}({2})", source.Id, target.Id, index);754            this.InternalAllocatedLinkIds[key] = id;755            return index;756        }757        /// <summary>758        /// Serialize the graph to a DGML string.759        /// </summary>760        public override string ToString()761        {762            using (var writer = new StringWriter())763            {764                this.WriteDgml(writer, false);765                return writer.ToString();766            }767        }768        internal void SaveDgml(string graphFilePath, bool includeDefaultStyles)769        {770            using (StreamWriter writer = new StreamWriter(graphFilePath, false, Encoding.UTF8))771            {772                this.WriteDgml(writer, includeDefaultStyles);773            }774        }775        /// <summary>776        /// Serialize the graph to DGML.777        /// </summary>778        public void WriteDgml(TextWriter writer, bool includeDefaultStyles)779        {780            writer.WriteLine("<DirectedGraph xmlns='{0}'>", DgmlNamespace);781            writer.WriteLine("  <Nodes>");782            if (this.InternalNodes != null)783            {784                List<string> nodes = new List<string>(this.InternalNodes.Keys);785                nodes.Sort(StringComparer.Ordinal);786                foreach (var id in nodes)787                {788                    GraphNode node = this.InternalNodes[id];789                    writer.Write("    <Node Id='{0}'", node.Id);790                    if (!string.IsNullOrEmpty(node.Label))791                    {792                        writer.Write(" Label='{0}'", node.Label);793                    }794                    if (!string.IsNullOrEmpty(node.Category))795                    {796                        writer.Write(" Category='{0}'", node.Category);797                    }798                    node.WriteAttributes(writer);799                    writer.WriteLine("/>");800                }801            }802            writer.WriteLine("  </Nodes>");803            writer.WriteLine("  <Links>");804            if (this.InternalLinks != null)805            {806                List<string> links = new List<string>(this.InternalLinks.Keys);807                links.Sort(StringComparer.Ordinal);808                foreach (var id in links)809                {810                    GraphLink link = this.InternalLinks[id];811                    writer.Write("    <Link Source='{0}' Target='{1}'", link.Source.Id, link.Target.Id);812                    if (!string.IsNullOrEmpty(link.Label))813                    {814                        writer.Write(" Label='{0}'", link.Label);815                    }816                    if (!string.IsNullOrEmpty(link.Category))817                    {818                        writer.Write(" Category='{0}'", link.Category);819                    }820                    if (link.Index.HasValue)821                    {822                        writer.Write(" Index='{0}'", link.Index.Value);823                    }824                    link.WriteAttributes(writer);825                    writer.WriteLine("/>");826                }827            }828            writer.WriteLine("  </Links>");829            if (includeDefaultStyles)830            {831                writer.WriteLine(832@"  <Styles>833    <Style TargetType=""Node"" GroupLabel=""Error"" ValueLabel=""True"">834      <Condition Expression=""HasCategory('Error')"" />835      <Setter Property=""Background"" Value=""#FFC15656"" />836    </Style>837    <Style TargetType=""Node"" GroupLabel=""Actor"" ValueLabel=""True"">838      <Condition Expression=""HasCategory('Actor')"" />839      <Setter Property=""Background"" Value=""#FF57AC56"" />840    </Style>841    <Style TargetType=""Node"" GroupLabel=""Monitor"" ValueLabel=""True"">842      <Condition Expression=""HasCategory('Monitor')"" />843      <Setter Property=""Background"" Value=""#FF558FDA"" />844    </Style>845    <Style TargetType=""Link"" GroupLabel=""halt"" ValueLabel=""True"">846      <Condition Expression=""HasCategory('halt')"" />847      <Setter Property=""Stroke"" Value=""#FFFF6C6C"" />848      <Setter Property=""StrokeDashArray"" Value=""4 2"" />849    </Style>850    <Style TargetType=""Link"" GroupLabel=""push"" ValueLabel=""True"">851      <Condition Expression=""HasCategory('push')"" />852      <Setter Property=""Stroke"" Value=""#FF7380F5"" />853      <Setter Property=""StrokeDashArray"" Value=""4 2"" />854    </Style>855    <Style TargetType=""Link"" GroupLabel=""pop"" ValueLabel=""True"">856      <Condition Expression=""HasCategory('pop')"" />857      <Setter Property=""Stroke"" Value=""#FF7380F5"" />858      <Setter Property=""StrokeDashArray"" Value=""4 2"" />859    </Style>860  </Styles>");861            }862            writer.WriteLine("</DirectedGraph>");863        }864        /// <summary>865        /// Load a DGML file into a new Graph object.866        /// </summary>867        /// <param name="graphFilePath">Full path to the DGML file.</param>868        /// <returns>The loaded Graph object.</returns>869        public static Graph LoadDgml(string graphFilePath)870        {871            XDocument doc = XDocument.Load(graphFilePath);872            Graph result = new Graph();873            var ns = doc.Root.Name.Namespace;874            if (ns != DgmlNamespace)875            {876                throw new Exception(string.Format("File '{0}' does not contain the DGML namespace", graphFilePath));877            }878            foreach (var e in doc.Root.Element(ns + "Nodes").Elements(ns + "Node"))879            {880                var id = (string)e.Attribute("Id");881                var label = (string)e.Attribute("Label");882                var category = (string)e.Attribute("Category");883                GraphNode node = new GraphNode(id, label, category);884                node.AddDgmlProperties(e);885                result.GetOrCreateNode(node);886            }887            foreach (var e in doc.Root.Element(ns + "Links").Elements(ns + "Link"))888            {889                var srcId = (string)e.Attribute("Source");890                var targetId = (string)e.Attribute("Target");891                var label = (string)e.Attribute("Label");892                var category = (string)e.Attribute("Category");893                var srcNode = result.GetOrCreateNode(srcId);894                var targetNode = result.GetOrCreateNode(targetId);895                XAttribute indexAttr = e.Attribute("index");896                int? index = null;897                if (indexAttr != null)898                {899                    index = (int)indexAttr;900                }901                var link = result.GetOrCreateLink(srcNode, targetNode, index, label, category);902                link.AddDgmlProperties(e);903            }904            return result;905        }906        /// <summary>907        /// Merge the given graph so that this graph becomes a superset of both graphs.908        /// </summary>909        /// <param name="other">The new graph to merge into this graph.</param>910        public void Merge(Graph other)911        {912            foreach (var node in other.InternalNodes.Values)913            {914                var newNode = this.GetOrCreateNode(node.Id, node.Label, node.Category);915                newNode.Merge(node);916            }917            foreach (var link in other.InternalLinks.Values)918            {919                var source = this.GetOrCreateNode(link.Source.Id, link.Source.Label, link.Source.Category);920                var target = this.GetOrCreateNode(link.Target.Id, link.Target.Label, link.Target.Category);921                int? index = null;922                if (link.Index.HasValue)923                {924                    // ouch, link indexes cannot be compared across Graph instances, we need to assign a new index here.925                    string key = string.Format("{0}->{1}({2})", source.Id, target.Id, link.Index.Value);926                    string linkId = other.InternalAllocatedLinkIds[key];927                    index = this.GetUniqueLinkIndex(source, target, linkId);928                }929                var newLink = this.GetOrCreateLink(source, target, index, link.Label, link.Category);930                newLink.Merge(link);931            }932        }933    }934    /// <summary>...
Automation Testing Tutorials

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