/// <summary>
/// Execute the query represented by an OData URI against an <c>IQueryable</c> data source
/// </summary>
/// <param name="query"><c>IQueryable</c> data source</param>
/// <param name="inputType">Model data type</param>
/// <param name="dynamicAccessor">Expression for accessing fields on dynamic model objects</param>
public ODataQueryable <object> Execute(IQueryable query, ExecutionSettings settings = null)
{
if (query == null)
{
throw new ArgumentNullException("query", "Query cannot be null");
}
settings = settings ?? ExecutionSettings.Empty;
var queryResult = query;
var constrainedQuery = query;
var path = settings.GetEdmSource(this);
var inputType = settings.GetInputType(query);
var dynamicAccessor = settings.GetDynamicAccessor();
var lookupByKey = false;
var children = this.QueryOption.Where(n => !(n is IgnoredNode) && !(n is AliasNode)).ToList();
// Try and do an ID lookup if applicable
var segments = PathSegments.ToArray();
var functionNode = segments.FirstOrDefault() as CallNode;
if (functionNode != null && segments.Length == 1)
{
var entity = ((IEdmCollectionType)path.Type).ElementType.ToStructuredType() as IEdmEntityType;
if (entity != null && entity.Key().Count() == functionNode.Arguments.Count)
{
var keys = entity.Key().ToArray();
var root = default(ODataNode);
for (var i = 0; i < keys.Length; i++)
{
var newNode = ODataNode.Equals(ODataNode.Identifier(keys[i].Name), functionNode.Arguments[i]);
if (root == null)
{
root = newNode;
}
else
{
newNode = ODataNode.And(root, newNode);
}
}
children.RemoveByFilter(n => n is FilterNode);
children.Add(ODataNode.Filter(root));
lookupByKey = true;
}
}
var maxPageSize = settings.GetMaxPageSize();
if (maxPageSize.HasValue && (!QueryOption.Top.HasValue || maxPageSize.Value < QueryOption.Top.Value))
{
children.RemoveByFilter(n => n is TopNode);
children.Add(ODataNode.Top(ODataNode.Literal(maxPageSize.Value)));
}
children.Sort();
// These should always come first
foreach (var node in children.Where(o => !(o is SelectNode)))
{
BuildQuery(node, inputType, dynamicAccessor, ref queryResult, ref constrainedQuery);
}
var selectNode = children.FirstOrDefault(o => o is SelectNode);
if (selectNode != null)
{
constrainedQuery = ProjectQuery(constrainedQuery, selectNode, inputType, dynamicAccessor);
}
return(new ODataQueryable <object>(constrainedQuery, this)
{
LookupByKey = lookupByKey
});
}
