protected override Expression VisitMember(MemberExpression expression)
{
var member = expression.Expression as MemberExpression;
if ((member != null && member.Expression.Type.Name == "IGrouping`2"))
{
ModelVisitor.QueryText.AppendFormat(" {0} ", LinqUtility.ResolvePropertyName(expression.Member.Name));
}
// Select(g=>g.Key)
else if (expression.Expression.Type.Name == "IGrouping`2")
{
var groupByClause = LinqUtility.PriorGroupBy(ModelVisitor)[0];
var newExpression = groupByClause.Selector as NewExpression;
if (newExpression != null)
{
ModelVisitor.QueryText.Append(" { ");
for (int i = 0; i < newExpression.Members.Count; i++)
{
string memberName = newExpression.Members[i].Name;
ModelVisitor.QueryText.AppendFormat(" {0} : {1} ",
LinqUtility.ResolvePropertyName(memberName),
LinqUtility.ResolvePropertyName(memberName));
if (i != newExpression.Members.Count - 1)
{
ModelVisitor.QueryText.Append(" , ");
}
}
ModelVisitor.QueryText.Append(" } ");
}
if (groupByClause.Selector.NodeType != ExpressionType.New)
{
ModelVisitor.QueryText.AppendFormat(" {0} ", LinqUtility.ResolvePropertyName(groupByClause.CollectVariableName));
}
}
else if (expression.Expression.Type.Name == "TraversalData`2" ||
expression.Expression.Type.Name == "ShortestPathData`2")
{
var parameterExpression = expression.Expression as ParameterExpression;
if (parameterExpression == null)
{
throw new InvalidOperationException("[TraversalData`2|ShortestPathData`2] VisitMember, expected a ParameterExpression");
}
string prefix = LinqUtility.MemberNameFromMap(parameterExpression.Name, "graph", ModelVisitor);
ModelVisitor.QueryText.AppendFormat(LinqUtility.ResolvePropertyName($"{prefix}_{expression.Member.Name}"));
}
else
{
Visit(expression.Expression);
ModelVisitor.QueryText.AppendFormat(".{0} ", LinqUtility.ResolveMemberName(ModelVisitor.Db, expression.Member));
}
return(expression);
}
protected override Expression VisitParameter(ParameterExpression expression)
{
string name = expression.Name;
if (expression.Type.Name == "TraversalData`2")
{
string prefix = LinqUtility.MemberNameFromMap(name, "graph", ModelVisitor);
ModelVisitor.QueryText.AppendFormat(" {{ {0} : {1}, {2} : {3}, {4} : {5} }} ",
LinqUtility.ResolvePropertyName($"vertex"),
LinqUtility.ResolvePropertyName($"{prefix}_Vertex"),
LinqUtility.ResolvePropertyName($"edge"),
LinqUtility.ResolvePropertyName($"{prefix}_Edge"),
LinqUtility.ResolvePropertyName($"path"),
LinqUtility.ResolvePropertyName($"{prefix}_Path"));
return(expression);
}
if (expression.Type.Name == "ShortestPathData`2")
{
string prefix = LinqUtility.MemberNameFromMap(name, "graph", ModelVisitor);
ModelVisitor.QueryText.AppendFormat(" {{ {0} : {1}, {2} : {3} }} ",
LinqUtility.ResolvePropertyName($"vertex"),
LinqUtility.ResolvePropertyName($"{prefix}_Vertex"),
LinqUtility.ResolvePropertyName($"edge"),
LinqUtility.ResolvePropertyName($"{prefix}_Edge"));
return(expression);
}
ModelVisitor.QueryText.AppendFormat(" {0} ", LinqUtility.ResolvePropertyName(name));
return(expression);
}
public void VisitTraversalClause(ITraversalClause traversalClause, QueryModel queryModel, int index)
{
string prefix = LinqUtility.MemberNameFromMap(traversalClause.Identifier, "graph", this);
if (traversalClause.TargetVertex != null)
{
QueryText.AppendFormat(" for {0}, {1} in ",
LinqUtility.ResolvePropertyName($"{prefix}_Vertex"),
LinqUtility.ResolvePropertyName($"{prefix}_Edge"));
}
else
{
QueryText.AppendFormat(" for {0}, {1}, {2} in ",
LinqUtility.ResolvePropertyName($"{prefix}_Vertex"),
LinqUtility.ResolvePropertyName($"{prefix}_Edge"),
LinqUtility.ResolvePropertyName($"{prefix}_Path"));
}
if (traversalClause.Min != null && traversalClause.Max != null)
{
QueryText.AppendFormat(" {0}..{1} ", traversalClause.Min.Value, traversalClause.Max);
}
QueryText.AppendFormat(" {0} ", traversalClause.Direction != null
? traversalClause.Direction.Value
: Utils.EdgeDirectionToString(EdgeDirection.Any));
if (traversalClause.TargetVertex != null)
{
QueryText.Append(" shortest_path ");
GetAqlExpression(traversalClause.StartVertex, queryModel);
QueryText.Append(" to ");
GetAqlExpression(traversalClause.TargetVertex, queryModel);
}
else
{
GetAqlExpression(traversalClause.StartVertex, queryModel);
}
if (string.IsNullOrEmpty(traversalClause.GraphName) == false)
{
QueryText.AppendFormat(" graph \"{0}\" ", traversalClause.GraphName);
}
else
{
StringBuilder edges = new StringBuilder();
for (int i = 0; i < traversalClause.EdgeCollections.Count; i++)
{
var e = traversalClause.EdgeCollections[i];
if (i != 0)
{
edges.Append(", ");
}
if (e.Direction.HasValue)
{
edges.AppendFormat("{0} ", Utils.EdgeDirectionToString(e.Direction.Value));
}
edges.Append(LinqUtility.ResolvePropertyName(e.CollectionName));
}
QueryText.Append(edges);
}
if (traversalClause.Options != null)
{
QueryText.AppendFormat(" options {0} ", new DocumentSerializer(Db).SerializeWithoutReader(traversalClause.Options.Value));
}
}