protected virtual IDictionary <ResourceFieldAttribute, QueryLayer> GetSparseFieldSetProjection(IReadOnlyCollection <QueryExpression> expressionsInScope, ResourceContext resourceContext)
{
if (expressionsInScope == null)
{
throw new ArgumentNullException(nameof(expressionsInScope));
}
if (resourceContext == null)
{
throw new ArgumentNullException(nameof(resourceContext));
}
var attributes = expressionsInScope.OfType <SparseFieldSetExpression>().SelectMany(sparseFieldSet => sparseFieldSet.Attributes).ToHashSet();
var tempExpression = attributes.Any() ? new SparseFieldSetExpression(attributes) : null;
tempExpression = _resourceDefinitionAccessor.OnApplySparseFieldSet(resourceContext.ResourceType, tempExpression);
attributes = tempExpression == null ? new HashSet <AttrAttribute>() : tempExpression.Attributes.ToHashSet();
if (!attributes.Any())
{
return(null);
}
var idAttribute = resourceContext.Attributes.Single(x => x.Property.Name == nameof(Identifiable.Id));
attributes.Add(idAttribute);
return(attributes.Cast <ResourceFieldAttribute>().ToDictionary(key => key, value => (QueryLayer)null));
}
public IReadOnlyCollection <ResourceFieldAttribute> GetSparseFieldSetForQuery(ResourceContext resourceContext)
{
ArgumentGuard.NotNull(resourceContext, nameof(resourceContext));
if (!_visitedTable.ContainsKey(resourceContext))
{
SparseFieldSetExpression inputExpression = _lazySourceTable.Value.ContainsKey(resourceContext)
? new SparseFieldSetExpression(_lazySourceTable.Value[resourceContext])
: null;
SparseFieldSetExpression outputExpression = _resourceDefinitionAccessor.OnApplySparseFieldSet(resourceContext.ResourceType, inputExpression);
HashSet <ResourceFieldAttribute> outputFields = outputExpression == null
? new HashSet <ResourceFieldAttribute>()
: outputExpression.Fields.ToHashSet();
_visitedTable[resourceContext] = outputFields;
}
return(_visitedTable[resourceContext]);
}
public IReadOnlyCollection <ResourceFieldAttribute> GetSparseFieldSetForQuery(ResourceContext resourceContext)
{
if (resourceContext == null)
{
throw new ArgumentNullException(nameof(resourceContext));
}
if (!_visitedTable.ContainsKey(resourceContext))
{
var inputExpression = _lazySourceTable.Value.ContainsKey(resourceContext)
? new SparseFieldSetExpression(_lazySourceTable.Value[resourceContext])
: null;
var outputExpression = _resourceDefinitionAccessor.OnApplySparseFieldSet(resourceContext.ResourceType, inputExpression);
var outputFields = outputExpression == null
? new HashSet <ResourceFieldAttribute>()
: outputExpression.Fields.ToHashSet();
_visitedTable[resourceContext] = outputFields;
}
return(_visitedTable[resourceContext]);
}
/// <inheritdoc />
public IReadOnlyCollection <AttrAttribute> GetAttributes(Type resourceType, RelationshipAttribute relationship = null)
{
if (resourceType == null)
{
throw new ArgumentNullException(nameof(resourceType));
}
if (_request.Kind == EndpointKind.Relationship)
{
return(Array.Empty <AttrAttribute>());
}
var sparseFieldSetAttributes = _constraintProviders
.SelectMany(p => p.GetConstraints())
.Where(expressionInScope => relationship == null
? expressionInScope.Scope == null
: expressionInScope.Scope != null && expressionInScope.Scope.Fields.Last().Equals(relationship))
.Select(expressionInScope => expressionInScope.Expression)
.OfType <SparseFieldSetExpression>()
.SelectMany(sparseFieldSet => sparseFieldSet.Attributes)
.ToHashSet();
if (!sparseFieldSetAttributes.Any())
{
sparseFieldSetAttributes = GetViewableAttributes(resourceType);
}
var inputExpression = sparseFieldSetAttributes.Any() ? new SparseFieldSetExpression(sparseFieldSetAttributes) : null;
var outputExpression = _resourceDefinitionAccessor.OnApplySparseFieldSet(resourceType, inputExpression);
if (outputExpression == null)
{
sparseFieldSetAttributes = GetViewableAttributes(resourceType);
}
else
{
sparseFieldSetAttributes.IntersectWith(outputExpression.Attributes);
}
return(sparseFieldSetAttributes);
}