protected virtual ISelectionVisitorAction Visit(
IOutputField field,
TContext context)
{
TContext?localContext = OnBeforeEnter(field, context);
ISelectionVisitorAction?result = Enter(field, localContext);
localContext = OnAfterEnter(field, localContext, result);
if (result.Kind == SelectionVisitorActionKind.Continue)
{
if (VisitChildren(field, context).Kind == SelectionVisitorActionKind.Break)
{
return(Break);
}
}
if (result.Kind == SelectionVisitorActionKind.Continue ||
result.Kind == SelectionVisitorActionKind.SkipAndLeave)
{
localContext = OnBeforeLeave(field, localContext);
result = Leave(field, localContext);
OnAfterLeave(field, localContext, result);
}
return(result);
}
/// <inheritdoc/>
public override bool TryHandleEnter(
Neo4JProjectionVisitorContext context,
ISelection selection,
[NotNullWhen(true)] out ISelectionVisitorAction?action)
{
++context.CurrentLevel;
selection.Field.ContextData.TryGetValue(
nameof(Neo4JRelationshipAttribute),
out object?relationship);
if (relationship is Neo4JRelationshipAttribute rel)
{
context.RelationshipTypes.Push(rel);
}
context.StartNodes.Push(Cypher.NamedNode(selection.DeclaringType.Name.Value));
if (context.RelationshipProjections.ContainsKey(context.CurrentLevel))
{
context.RelationshipProjections[context.CurrentLevel]
.Enqueue(selection.Field.GetName());
}
else
{
Queue <object> queue = new();
queue.Enqueue(selection.Field.GetName());
context.RelationshipProjections.Add(context.CurrentLevel, queue);
}
action = SelectionVisitor.Continue;
return(true);
}
public bool TryHandleEnter(
T context,
ISelection selection,
[NotNullWhen(true)] out ISelectionVisitorAction?action)
{
_interceptor.BeforeProjection(context, selection);
return(_handler.TryHandleEnter(context, selection, out action));
}
public override bool TryHandleEnter(
QueryableProjectionContext context,
ISelection selection,
[NotNullWhen(true)] out ISelectionVisitorAction?action)
{
action = SelectionVisitor.Continue;
return(true);
}
/// <inheritdoc/>
public override bool TryHandleLeave(
MongoDbProjectionVisitorContext context,
ISelection selection,
[NotNullWhen(true)] out ISelectionVisitorAction?action)
{
action = SelectionVisitor.Continue;
return(true);
}
public bool TryHandleLeave(
T context,
ISelection selection,
[NotNullWhen(true)] out ISelectionVisitorAction?action)
{
_handler.TryHandleLeave(context, selection, out action);
_interceptor.AfterProjection(context, selection);
return(action is not null);
}
/// <inheritdoc/>
public override bool TryHandleEnter(
MongoDbProjectionVisitorContext context,
ISelection selection,
[NotNullWhen(true)] out ISelectionVisitorAction?action)
{
IObjectField field = selection.Field;
context.Path.Push(field.GetName());
action = SelectionVisitor.Continue;
return(true);
}
/// <inheritdoc/>
public override bool TryHandleEnter(
MongoDbProjectionVisitorContext context,
ISelection selection,
out ISelectionVisitorAction?action)
{
IObjectField field = selection.Field;
context.Path.Push(field.GetName());
context.Projections.Push(
new MongoDbIncludeProjectionOperation(context.GetPath()));
context.Path.Pop();
action = SelectionVisitor.SkipAndLeave;
return(true);
}
/// <inheritdoc/>
public override bool TryHandleLeave(
Neo4JProjectionVisitorContext context,
ISelection selection,
[NotNullWhen(true)] out ISelectionVisitorAction?action)
{
if (context.StartNodes.Any())
{
object field = context.RelationshipProjections[context.CurrentLevel].Dequeue();
context.TryCreateRelationshipProjection(out PatternComprehension? projections);
switch (context.CurrentLevel)
{
case > 1:
context.RelationshipProjections[context.CurrentLevel - 1].Enqueue(field);
context.RelationshipProjections[context.CurrentLevel - 1]
.Enqueue(projections);
break;
case 1:
context.Projections.Push(field);
context.Projections.Push(projections);
break;
}
}
--context.CurrentLevel;
context.StartNodes.Pop();
context.EndNodes.Pop();
context.Relationships.Pop();
if (context.CurrentLevel == 0)
{
context.RelationshipProjections.Clear();
}
action = SelectionVisitor.Continue;
return(true);
}
public abstract bool TryHandleLeave(
T context,
ISelection selection,
[NotNullWhen(true)] out ISelectionVisitorAction?action);