public override object VisitInclude(IncludeExpression expression, object argument)
{
foreach (IncludeElementExpression element in expression.Elements)
{
Visit(element, null);
}
return(null);
}
public override QueryExpression VisitInclude(IncludeExpression expression, TArgument argument)
{
if (expression != null)
{
var newElements = VisitSequence(expression.Elements, argument);
if (newElements.Count == 0)
{
return(IncludeExpression.Empty);
}
var newExpression = new IncludeExpression(newElements);
return(newExpression.Equals(expression) ? expression : newExpression);
}
return(null);
}
/// <summary>
/// Converts a tree of inclusions into a set of relationship chains.
/// </summary>
/// <example>
/// Input tree:
/// Article
/// {
/// Blog,
/// Revisions
/// {
/// Author
/// }
/// }
///
/// Output chains:
/// Article -> Blog,
/// Article -> Revisions -> Author
/// </example>
public static IReadOnlyCollection <ResourceFieldChainExpression> GetRelationshipChains(IncludeExpression include)
{
if (include == null)
{
throw new ArgumentNullException(nameof(include));
}
IncludeToChainsConverter converter = new IncludeToChainsConverter();
converter.Visit(include, null);
return(converter.Chains);
}
/// <summary>
/// Converts a tree of inclusions into a set of relationship chains.
/// </summary>
/// <example>
/// Input tree:
/// <code><![CDATA[
/// Article
/// {
/// Blog,
/// Revisions
/// {
/// Author
/// }
/// }
/// ]]></code>
/// Output chains:
/// <code><![CDATA[
/// Article -> Blog,
/// Article -> Revisions -> Author
/// ]]></code>
/// </example>
public static IReadOnlyCollection <ResourceFieldChainExpression> GetRelationshipChains(IncludeExpression include)
{
ArgumentGuard.NotNull(include, nameof(include));
IncludeToChainsConverter converter = new IncludeToChainsConverter();
converter.Visit(include, null);
return(converter.Chains);
}
/// <summary>
/// Converts a tree of inclusions into a set of relationship chains.
/// </summary>
/// <example>
/// Input tree: <code><![CDATA[
/// Article
/// {
/// Blog,
/// Revisions
/// {
/// Author
/// }
/// }
/// ]]></code> Output chains:
/// <code><![CDATA[
/// Article -> Blog,
/// Article -> Revisions -> Author
/// ]]></code>
/// </example>
public IReadOnlyCollection <ResourceFieldChainExpression> GetRelationshipChains(IncludeExpression include)
{
ArgumentGuard.NotNull(include, nameof(include));
if (!include.Elements.Any())
{
return(Array.Empty <ResourceFieldChainExpression>());
}
var converter = new IncludeToChainsConverter();
converter.Visit(include, null);
return(converter.Chains);
}
