internal static ProjectDependencyGraph ReadGraph(Solution solution, ObjectReader reader, CancellationToken cancellationToken)
{
var references = new List <ProjectId>();
var map = ImmutableDictionary.Create <ProjectId, ImmutableHashSet <ProjectId> >();
var reverseMap = ImmutableDictionary.Create <ProjectId, ImmutableHashSet <ProjectId> >();
var format = reader.ReadString();
if (!string.Equals(format, SerializationFormat, StringComparison.Ordinal))
{
return(null);
}
var graphVersion = VersionStamp.ReadFrom(reader);
var projectCount = reader.ReadInt32();
for (var i = 0; i < projectCount; i++)
{
cancellationToken.ThrowIfCancellationRequested();
var referenceCount = reader.ReadInt32();
if (referenceCount < 0)
{
continue;
}
references.Clear();
var projectFilePath = reader.ReadString();
for (var j = 0; j < referenceCount; j++)
{
var referenceFilePath = reader.ReadString();
var referenceProject = GetProject(solution, referenceFilePath);
if (referenceProject == null)
{
return(null);
}
references.Add(referenceProject.Id);
}
var project = GetProject(solution, projectFilePath);
if (project == null)
{
return(null);
}
map = map.Add(project.Id, ImmutableHashSet.CreateRange <ProjectId>(references));
reverseMap = reverseMap.AddAll(references, project.Id);
}
return(new ProjectDependencyGraph(solution, graphVersion, map, reverseMap));
}
private static bool TryReadVersion(ObjectReader reader, out VersionStamp persistedVersion)
{
persistedVersion = VersionStamp.Default;
if (reader?.ReadString() != SerializationFormat)
{
return(false);
}
persistedVersion = VersionStamp.ReadFrom(reader);
return(true);
}