private object ProcessSkip(SkipQueryNode skip)
{
var processedOffset = ProcessNode(skip.Amount);
_sparqlModel.Offset = Convert.ToInt32(processedOffset);
return(ProcessNode(skip.Collection));
}
/// <summary>
/// Processes the skip operator (if any) and returns the combined query.
/// </summary>
/// <param name="query">The query tree constructed so far.</param>
/// <param name="skip">The skip amount or null if none was specified.</param>
/// <returns>
/// The unmodified <paramref name="query"/> if no skip is specified or the combined
/// query tree including the skip operator if it was specified.
/// </returns>
private static QueryNode ProcessSkip(QueryNode query, int? skip)
{
ExceptionUtils.CheckArgumentNotNull(query, "query");
if (skip.HasValue)
{
CollectionQueryNode entityCollection = query.AsEntityCollectionNode();
if (entityCollection == null)
{
throw new ODataException(Strings.MetadataBinder_SkipNotApplicable);
}
int skipValue = skip.Value;
if (skipValue < 0)
{
throw new ODataException(Strings.MetadataBinder_SkipRequiresNonNegativeInteger(skipValue.ToString(CultureInfo.CurrentCulture)));
}
query = new SkipQueryNode()
{
Collection = entityCollection,
Amount = new ConstantQueryNode { Value = skipValue }
};
}
return query;
}
/// <summary>
/// Translates a skip operation.
/// </summary>
/// <param name="skipNode">The skip node to translate.</param>
/// <returns>The translated expression which evaluates to the result of the skip operation.</returns>
protected virtual Expression TranslateSkip(SkipQueryNode skipNode)
{
ExceptionUtils.CheckArgumentNotNull(skipNode, "skipNode");
ExceptionUtils.CheckArgumentNotNull(skipNode.Amount, "skipNode.Amount");
Expression collectionExpression = this.Translate(skipNode.Collection);
Expression amountExpression = this.Translate(skipNode.Amount);
// TODO: eventually we will have to support this on Enumerable as well (as it can happen on expansions)
return Expression.Call(
typeof(Queryable),
SkipMethodName,
new Type[] { skipNode.Collection.ItemType.GetInstanceType(this.model) },
collectionExpression,
amountExpression);
}
private object ProcessSkip(SkipQueryNode skip)
{
var processedOffset = ProcessNode(skip.Amount);
_sparqlModel.Offset = Convert.ToInt32(processedOffset);
return ProcessNode(skip.Collection);
}
