// Process $levels in SelectedItems.
private IEnumerable <SelectItem> ProcessLevels(
IEnumerable <SelectItem> selectItems,
int levelsMaxLiteralExpansionDepth,
ModelBoundQuerySettings querySettings,
out bool levelsEncountered,
out bool isMaxLevel)
{
levelsEncountered = false;
isMaxLevel = false;
IList <SelectItem> items = new List <SelectItem>();
foreach (SelectItem selectItem in selectItems)
{
ExpandedNavigationSelectItem item = selectItem as ExpandedNavigationSelectItem;
if (item == null)
{
// There is no $levels in non-ExpandedNavigationSelectItem.
items.Add(selectItem);
}
else
{
bool levelsEncouteredInExpand;
bool isMaxLevelInExpand;
// Process $levels in ExpandedNavigationSelectItem.
ExpandedNavigationSelectItem expandItem = this.ProcessLevels(
item,
levelsMaxLiteralExpansionDepth,
querySettings,
out levelsEncouteredInExpand,
out isMaxLevelInExpand);
if (item.LevelsOption != null && item.LevelsOption.Level > 0 && expandItem == null)
{
// Abandon this attempt if any of the items failed to expand
return(null);
}
else if (item.LevelsOption != null)
{
// The expansion would be volatile if any of the expand item is max level
isMaxLevel = isMaxLevel || isMaxLevelInExpand;
}
levelsEncountered = levelsEncountered || levelsEncouteredInExpand;
if (expandItem != null)
{
items.Add(expandItem);
}
}
}
return(items);
}
internal SelectExpandClause ProcessLevels()
{
bool levelsEncountered;
bool isMaxLevel;
ModelBoundQuerySettings querySettings = EdmLibHelpers.GetModelBoundQuerySettings(this.Context.TargetProperty,
this.Context.TargetStructuredType, this.Context.Model, this.Context.DefaultQuerySettings);
return(this.ProcessLevels(this.SelectExpandClause,
this.LevelsMaxLiteralExpansionDepth < 0 ? ODataValidationSettings.DefaultMaxExpansionDepth : this.LevelsMaxLiteralExpansionDepth,
querySettings,
out levelsEncountered,
out isMaxLevel));
}
/// <summary>
/// Copy and create new instance of the <see cref="ModelBoundQuerySettings"/> class
/// </summary>
public ModelBoundQuerySettings(ModelBoundQuerySettings querySettings)
{
this._maxTop = querySettings.MaxTop;
this.PageSize = querySettings.PageSize;
this.Countable = querySettings.Countable;
this.DefaultEnableFilter = querySettings.DefaultEnableFilter;
this.DefaultEnableOrderBy = querySettings.DefaultEnableOrderBy;
this.DefaultExpandType = querySettings.DefaultExpandType;
this.DefaultMaxDepth = querySettings.DefaultMaxDepth;
this.DefaultSelectType = querySettings.DefaultSelectType;
this.CopyOrderByConfigurations(querySettings.OrderByConfigurations);
this.CopyFilterConfigurations(querySettings.FilterConfigurations);
this.CopyExpandConfigurations(querySettings.ExpandConfigurations);
this.CopySelectConfigurations(querySettings.SelectConfigurations);
}
private static int GetMaxExpandDepth(ModelBoundQuerySettings querySettings, string propertyName)
{
int result = 0;
if (querySettings != null)
{
ExpandConfiguration expandConfiguration;
if (querySettings.ExpandConfigurations.TryGetValue(propertyName, out expandConfiguration))
{
result = expandConfiguration.MaxDepth;
}
else
{
if (querySettings.DefaultExpandType.HasValue &&
querySettings.DefaultExpandType != SelectExpandType.Disabled)
{
result = querySettings.DefaultMaxDepth;
}
}
}
return(result);
}
// Process $levels in SelectExpandClause.
private SelectExpandClause ProcessLevels(
SelectExpandClause selectExpandClause,
int levelsMaxLiteralExpansionDepth,
ModelBoundQuerySettings querySettings,
out bool levelsEncountered,
out bool isMaxLevel)
{
levelsEncountered = false;
isMaxLevel = false;
if (selectExpandClause == null)
{
return(null);
}
// Process $levels in SelectItems of SelectExpandClause.
IEnumerable <SelectItem> selectItems = this.ProcessLevels(
selectExpandClause.SelectedItems,
levelsMaxLiteralExpansionDepth,
querySettings,
out levelsEncountered,
out isMaxLevel);
if (selectItems == null)
{
return(null);
}
else if (levelsEncountered)
{
return(new SelectExpandClause(selectItems, selectExpandClause.AllSelected));
}
else
{
// Return the original SelectExpandClause if no $levels is found.
return(selectExpandClause);
}
}
// Process $levels in ExpandedNavigationSelectItem.
private ExpandedNavigationSelectItem ProcessLevels(
ExpandedNavigationSelectItem expandItem,
int levelsMaxLiteralExpansionDepth,
ModelBoundQuerySettings querySettings,
out bool levelsEncounteredInExpand,
out bool isMaxLevelInExpand)
{
int level;
isMaxLevelInExpand = false;
if (expandItem.LevelsOption == null)
{
levelsEncounteredInExpand = false;
level = 1;
}
else
{
levelsEncounteredInExpand = true;
if (expandItem.LevelsOption.IsMaxLevel)
{
isMaxLevelInExpand = true;
level = levelsMaxLiteralExpansionDepth;
}
else
{
level = (int)expandItem.LevelsOption.Level;
}
}
// Do not expand when:
// 1. $levels is equal to or less than 0.
// 2. $levels value is greater than current MaxExpansionDepth
if (level <= 0 || level > levelsMaxLiteralExpansionDepth)
{
return(null);
}
ExpandedNavigationSelectItem item = null;
SelectExpandClause currentSelectExpandClause = null;
SelectExpandClause selectExpandClause = null;
bool levelsEncounteredInInnerExpand = false;
bool isMaxLevelInInnerExpand = false;
var entityType = expandItem.NavigationSource.EntityType();
IEdmNavigationProperty navigationProperty =
(expandItem.PathToNavigationProperty.LastSegment as NavigationPropertySegment).NavigationProperty;
ModelBoundQuerySettings nestQuerySettings = EdmLibHelpers.GetModelBoundQuerySettings(navigationProperty,
navigationProperty.ToEntityType(),
this.Context.Model);
// Try different expansion depth until expandItem.SelectAndExpand is successfully expanded
while (selectExpandClause == null && level > 0)
{
selectExpandClause = this.ProcessLevels(
expandItem.SelectAndExpand,
levelsMaxLiteralExpansionDepth - level,
nestQuerySettings,
out levelsEncounteredInInnerExpand,
out isMaxLevelInInnerExpand);
level--;
}
if (selectExpandClause == null)
{
return(null);
}
// Correct level value
level++;
List <SelectItem> originAutoSelectItems;
List <SelectItem> originAutoExpandItems;
int maxDepth = GetMaxExpandDepth(querySettings, navigationProperty.Name);
if (maxDepth == 0 || levelsMaxLiteralExpansionDepth > maxDepth)
{
maxDepth = levelsMaxLiteralExpansionDepth;
}
this.GetAutoSelectExpandItems(
entityType,
this.Context.Model,
expandItem.NavigationSource,
selectExpandClause.AllSelected,
nestQuerySettings,
maxDepth - 1,
out originAutoSelectItems,
out originAutoExpandItems);
if (expandItem.SelectAndExpand.SelectedItems.Any(it => it is PathSelectItem))
{
originAutoSelectItems.Clear();
}
if (level > 1)
{
RemoveSameExpandItem(navigationProperty, originAutoExpandItems);
}
List <SelectItem> autoExpandItems = new List <SelectItem>(originAutoExpandItems);
bool hasAutoSelectExpandInExpand = (originAutoSelectItems.Count() + originAutoExpandItems.Count() != 0);
bool allSelected = originAutoSelectItems.Count == 0 && selectExpandClause.AllSelected;
while (level > 0)
{
autoExpandItems = RemoveExpandItemExceedMaxDepth(maxDepth - level, originAutoExpandItems);
if (item == null)
{
if (hasAutoSelectExpandInExpand)
{
currentSelectExpandClause = new SelectExpandClause(
new SelectItem[] { }.Concat(selectExpandClause.SelectedItems)
.Concat(originAutoSelectItems).Concat(autoExpandItems),
allSelected);
}
else
{
currentSelectExpandClause = selectExpandClause;
}
}
else if (selectExpandClause.AllSelected)
{
// Concat the processed items
currentSelectExpandClause = new SelectExpandClause(
new SelectItem[] { item }.Concat(selectExpandClause.SelectedItems)
.Concat(originAutoSelectItems).Concat(autoExpandItems),
allSelected);
}
else
{
// PathSelectItem is needed for the expanded item if AllSelected is false.
PathSelectItem pathSelectItem = new PathSelectItem(
new ODataSelectPath(expandItem.PathToNavigationProperty));
// Keep default SelectItems before expanded item to keep consistent with normal SelectExpandClause
SelectItem[] items = new SelectItem[] { item, pathSelectItem };
currentSelectExpandClause = new SelectExpandClause(
new SelectItem[] { }.Concat(selectExpandClause.SelectedItems)
.Concat(items)
.Concat(originAutoSelectItems).Concat(autoExpandItems),
allSelected);
}
// Construct a new ExpandedNavigationSelectItem with current SelectExpandClause.
item = new ExpandedNavigationSelectItem(
expandItem.PathToNavigationProperty,
expandItem.NavigationSource,
currentSelectExpandClause);
level--;
// Need expand and construct selectExpandClause every time if it is max level in inner expand
if (isMaxLevelInInnerExpand)
{
selectExpandClause = this.ProcessLevels(
expandItem.SelectAndExpand,
levelsMaxLiteralExpansionDepth - level,
nestQuerySettings,
out levelsEncounteredInInnerExpand,
out isMaxLevelInInnerExpand);
}
}
levelsEncounteredInExpand = levelsEncounteredInExpand || levelsEncounteredInInnerExpand || hasAutoSelectExpandInExpand;
isMaxLevelInExpand = isMaxLevelInExpand || isMaxLevelInInnerExpand;
return(item);
}
private void GetAutoSelectExpandItems(
IEdmEntityType baseEntityType,
IEdmModel model,
IEdmNavigationSource navigationSource,
bool isAllSelected,
ModelBoundQuerySettings modelBoundQuerySettings,
int depth,
out List <SelectItem> autoSelectItems,
out List <SelectItem> autoExpandItems)
{
autoSelectItems = new List <SelectItem>();
var autoSelectProperties = EdmLibHelpers.GetAutoSelectProperties(null,
baseEntityType, model, modelBoundQuerySettings);
foreach (var autoSelectProperty in autoSelectProperties)
{
List <ODataPathSegment> pathSegments = new List <ODataPathSegment>()
{
new PropertySegment(autoSelectProperty)
};
PathSelectItem pathSelectItem = new PathSelectItem(
new ODataSelectPath(pathSegments));
autoSelectItems.Add(pathSelectItem);
}
autoExpandItems = new List <SelectItem>();
depth--;
if (depth < 0)
{
return;
}
var autoExpandNavigationProperties = EdmLibHelpers.GetAutoExpandNavigationProperties(null, baseEntityType,
model, !isAllSelected, modelBoundQuerySettings);
foreach (var navigationProperty in autoExpandNavigationProperties)
{
IEdmNavigationSource currentEdmNavigationSource =
navigationSource.FindNavigationTarget(navigationProperty);
if (currentEdmNavigationSource != null)
{
List <ODataPathSegment> pathSegments = new List <ODataPathSegment>()
{
new NavigationPropertySegment(navigationProperty, currentEdmNavigationSource)
};
ODataExpandPath expandPath = new ODataExpandPath(pathSegments);
SelectExpandClause selectExpandClause = new SelectExpandClause(new List <SelectItem>(),
true);
ExpandedNavigationSelectItem item = new ExpandedNavigationSelectItem(expandPath,
currentEdmNavigationSource, selectExpandClause);
modelBoundQuerySettings = EdmLibHelpers.GetModelBoundQuerySettings(navigationProperty,
navigationProperty.ToEntityType(), model);
List <SelectItem> nestedSelectItems;
List <SelectItem> nestedExpandItems;
int maxExpandDepth = GetMaxExpandDepth(modelBoundQuerySettings, navigationProperty.Name);
if (maxExpandDepth != 0 && maxExpandDepth < depth)
{
depth = maxExpandDepth;
}
this.GetAutoSelectExpandItems(
currentEdmNavigationSource.EntityType(),
model,
item.NavigationSource,
true,
modelBoundQuerySettings,
depth,
out nestedSelectItems,
out nestedExpandItems);
selectExpandClause = new SelectExpandClause(nestedSelectItems.Concat(nestedExpandItems),
nestedSelectItems.Count == 0);
item = new ExpandedNavigationSelectItem(expandPath, currentEdmNavigationSource,
selectExpandClause);
autoExpandItems.Add(item);
if (!isAllSelected || autoSelectProperties.Count() != 0)
{
PathSelectItem pathSelectItem = new PathSelectItem(
new ODataSelectPath(pathSegments));
autoExpandItems.Add(pathSelectItem);
}
}
}
}