/// <summary>
/// Traverses from a "user" to a "movie" over the "rated" edge, filtering those edges as specified. If both
/// arguments are zero then there is no rating filter.
/// </summary>
public static GraphTraversal <Vertex, Vertex> Rated(this GraphTraversal <Vertex, Vertex> t, int min, int max)
{
if (min < 0 || max > 10)
{
throw new ArgumentException("min must be a value between 0 and 10");
}
if (max < 0 || max > 10)
{
throw new ArgumentException("min must be a value between 0 and 10");
}
if (min != 0 && max != 0 && min > max)
{
throw new ArgumentException("min cannot be greater than max");
}
if (min == 0 && max == 0)
{
return(t.Out(EdgeRated));
}
else if (min == 0)
{
return(t.OutE(EdgeRated).Has(KeyRating, Gt(min)).InV());
}
else if (max == 0)
{
return(t.OutE(EdgeRated).Has(KeyRating, Lt(min)).InV());
}
else
{
return(t.OutE(EdgeRated).Has(KeyRating, Between(min, max)).InV());
}
}
/// <summary>
/// Assumes a "movie" vertex and traverses to a "genre" vertex with a filter on the name of the genre. This step is meant
/// to be used as part of a <code>filter()</code> step for movies.
/// </summary>
public static GraphTraversal <Vertex, Vertex> Genre(this GraphTraversal <Vertex, Vertex> t, Genre genre, params Genre[] additionalGenres)
{
var genres = new List <string>();
genres.Add(GenreLookup.Names[genre]);
foreach (Genre current in additionalGenres)
{
genres.Add(GenreLookup.Names[current]);
}
if (genres.Count < 1)
{
throw new ArgumentException("There must be at least one genre option provided");
}
if (genres.Count == 1)
{
return(t.Out(EdgeBelongsTo).Has(KeyName, genres[0]));
}
else
{
return(t.Out(EdgeBelongsTo).Has(KeyName, Within(genres)));
}
}
public static GraphTraversal <Vertex, int> YoungestFriendsAge(this GraphTraversal <Vertex, Vertex> t)
{
return(t.Out("knows").HasLabel("person").Values <int>("age").Min <int>());
}
public static GraphTraversal <Vertex, Vertex> Knows(this GraphTraversal <Vertex, Vertex> t, string personName)
{
return(t.Out("knows").HasLabel("person").Has("name", personName));
}
public static GraphTraversal <Vertex, Vertex> WorkedOn(this GraphTraversal <Vertex, Vertex> traversal,
string appName) => traversal.Out(EdgeNames.WorkedOn)
.HasLabel(VertexNames.App)
.Has(Properties.Name, appName);
public static GraphTraversal <Vertex, Vertex> AssignedTo(this GraphTraversal <Vertex, Vertex> traversal,
string appName) => traversal.Out(EdgeNames.AssignedTo)
.HasLabel(VertexNames.App)
.Has(Properties.Name, appName);
/// <summary>
/// Traverses from a "movie" to an "person" over the "actor" edge.
/// </summary>
public static GraphTraversal <Vertex, Vertex> Actors(this GraphTraversal <Vertex, Vertex> t)
{
return(t.Out(EdgeActor).HasLabel(VertexPerson));
}
