// coerce fromExpr to toExpr type
// but also convert both to nonnullable types.
private void ConvertExpr(ref Expression fromExpr, ref Expression toExpr)
{
var constExpr = fromExpr as ConstantExpression;
var toType = TypeFns.GetNonNullableType(toExpr.Type);
if (constExpr != null)
{
if (constExpr.Value == null)
{
return;
}
var newValue = Convert.ChangeType(constExpr.Value, toType);
fromExpr = Expression.Constant(newValue);
}
else
{
fromExpr = Expression.Convert(fromExpr, toType);
}
if (TypeFns.IsNullableType(toExpr.Type))
{
toExpr = Expression.Convert(toExpr, toType);
}
}
/// <summary>
/// Apply the queryOptions to the query.
/// This method handles nested order-by statements the the current ASP.NET web api does not yet support.
/// </summary>
/// <param name="queryable"></param>
/// <param name="queryOptions"></param>
/// <param name="querySettings"></param>
/// <returns></returns>
public static IQueryable ApplyQuery(IQueryable queryable, ODataQueryOptions queryOptions, ODataQuerySettings querySettings)
{
// if we see an extended order by we also need to process any skip/take operators as well.
var orderByQueryString = queryOptions.RawValues.OrderBy;
// HACK: this is a hack because on a bug in querySettings.EnsureStableOrdering = true that overrides
// any existing order by clauses, instead of appending to them.
querySettings.EnsureStableOrdering = false;
if (orderByQueryString == null || orderByQueryString.IndexOf('/') < 0)
{
// Just let the default implementation handle it.
return(queryOptions.ApplyTo(queryable, querySettings));
}
var newQueryOptions = QueryHelper.RemoveExtendedOps(queryOptions);
var result = QueryHelper.ApplyQuery(queryable, newQueryOptions, querySettings);
var elementType = TypeFns.GetElementType(queryable.GetType());
string inlinecountString = queryOptions.RawValues.InlineCount;
if (!string.IsNullOrWhiteSpace(inlinecountString))
{
if (inlinecountString == "allpages")
{
if (result is IQueryable)
{
var inlineCount = (Int64)Queryable.Count((dynamic)result);
queryOptions.Request.SetInlineCount(inlineCount);
}
}
}
var orderByClauses = orderByQueryString.Split(',').ToList();
var isThenBy = false;
orderByClauses.ForEach(obc => {
var func = QueryBuilder.BuildOrderByFunc(isThenBy, elementType, obc);
result = func(result);
isThenBy = true;
});
var skipQueryString = queryOptions.RawValues.Skip;
if (!string.IsNullOrWhiteSpace(skipQueryString))
{
var count = int.Parse(skipQueryString);
var method = TypeFns.GetMethodByExample((IQueryable <String> q) => Queryable.Skip <String>(q, 999), elementType);
var func = BuildIQueryableFunc(elementType, method, count);
result = func(result);
}
var topQueryString = queryOptions.RawValues.Top;
if (!string.IsNullOrWhiteSpace(topQueryString))
{
var count = int.Parse(topQueryString);
var method = TypeFns.GetMethodByExample((IQueryable <String> q) => Queryable.Take <String>(q, 999), elementType);
var func = BuildIQueryableFunc(elementType, method, count);
result = func(result);
}
return(result);
}
/// <summary>
/// Constructs a generic list.
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
public static IList MakeGenericList(Type type)
{
return((IList)TypeFns.ConstructGenericInstance(typeof(List <>), type));
}
/// <summary>
/// Called when the action is executed.
/// </summary>
/// <param name="actionExecutedContext">The action executed context.</param>
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
if (actionExecutedContext.Response == null)
{
return;
}
if (!actionExecutedContext.Response.IsSuccessStatusCode)
{
return;
}
object responseObject;
if (!actionExecutedContext.Response.TryGetContentValue(out responseObject))
{
return;
}
var dQuery = ((dynamic)responseObject);
if (dQuery.GetType().IsInstanceOfType(typeof(IQueryable)))
{
return;
}
var elementType = TypeFns.GetElementType(responseObject.GetType());
NameValueCollection querystringParams =
HttpUtility.ParseQueryString(actionExecutedContext.Request.RequestUri.Query);
string filterQueryString = querystringParams["$filter"];
if (!string.IsNullOrWhiteSpace(filterQueryString))
{
var func = BuildFilterFunc(filterQueryString, elementType);
dQuery = func(dQuery as IQueryable);
}
int? inlineCount = null;
string inlinecountString = querystringParams["$inlinecount"];
if (!string.IsNullOrWhiteSpace(inlinecountString))
{
if (inlinecountString == "allpages")
{
if (dQuery is IQueryable)
{
inlineCount = Queryable.Count(dQuery);
}
}
}
string orderByQueryString = querystringParams["$orderby"];
if (!string.IsNullOrWhiteSpace(orderByQueryString))
{
var orderByClauses = orderByQueryString.Split(',').ToList();
var isThenBy = false;
orderByClauses.ForEach(obc => {
var func = BuildOrderByFunc(isThenBy, elementType, obc);
dQuery = func(dQuery as IQueryable);
isThenBy = true;
});
}
string skipQueryString = querystringParams["$skip"];
if (!string.IsNullOrWhiteSpace(skipQueryString))
{
var count = int.Parse(skipQueryString);
var method = TypeFns.GetMethodByExample((IQueryable <String> q) => Queryable.Skip <String>(q, 999), elementType);
var func = BuildIQueryableFunc(elementType, method, count);
dQuery = func(dQuery as IQueryable);
}
string topQueryString = querystringParams["$top"];
if (!string.IsNullOrWhiteSpace(topQueryString))
{
var count = int.Parse(topQueryString);
var method = TypeFns.GetMethodByExample((IQueryable <String> q) => Queryable.Take <String>(q, 999), elementType);
var func = BuildIQueryableFunc(elementType, method, count);
dQuery = func(dQuery as IQueryable);
}
string selectQueryString = querystringParams["$select"];
if (!string.IsNullOrWhiteSpace(selectQueryString))
{
var selectClauses = selectQueryString.Split(',').Select(sc => sc.Replace('/', '.')).ToList();
var func = BuildSelectFunc(elementType, selectClauses);
dQuery = func(dQuery as IQueryable);
}
string expandsQueryString = querystringParams["$expand"];
if (!string.IsNullOrWhiteSpace(expandsQueryString))
{
if (!string.IsNullOrWhiteSpace(selectQueryString))
{
throw new Exception("Use of both 'expand' and 'select' in the same query is not currently supported");
}
expandsQueryString.Split(',').Select(s => s.Trim()).ToList().ForEach(expand => {
dQuery = dQuery.Include(expand.Replace('/', '.'));
});
}
// execute any DbQueries here, so that any exceptions thrown can be properly returned.
// if we wait to have the query executed within the serializer, some exceptions will not
// serialize properly.
Object rQuery;
if (dQuery is IQueryable)
{
rQuery = System.Linq.Enumerable.ToList((dynamic)dQuery);
}
else
{
rQuery = dQuery;
}
var formatter = ((dynamic)actionExecutedContext.Response.Content).Formatter;
var oc = new System.Net.Http.ObjectContent(rQuery.GetType(), rQuery, formatter);
actionExecutedContext.Response.Content = oc;
if (inlineCount.HasValue)
{
actionExecutedContext.Response.Headers.Add("X-InlineCount", inlineCount.ToString());
}
}
private IQueryable ApplyExtendedOrderBy(IQueryable queryable, ODataQueryOptions queryOptions)
{
// if we see an extended order by we also need to process any skip/take operators as well.
var orderByQueryString = queryOptions.RawValues.OrderBy;
if (orderByQueryString == null || orderByQueryString.IndexOf("/") == -1)
{
return(null);
}
var request = queryOptions.Request;
var oldUri = request.RequestUri;
var map = oldUri.ParseQueryString();
var newQuery = map.Keys.Cast <String>()
.Where(k => (k != "$orderby") && (k != "$top") && (k != "$skip"))
.Select(k => k + "=" + map[k])
.ToAggregateString("&");
var newUrl = oldUri.Scheme + "://" + oldUri.Authority + oldUri.AbsolutePath + "?" + newQuery;
var newRequest = new HttpRequestMessage(request.Method, new Uri(newUrl));
var newQo = new ODataQueryOptions(queryOptions.Context, newRequest);
var result = base.ApplyQuery(queryable, newQo);
var elementType = TypeFns.GetElementType(queryable.GetType());
if (!string.IsNullOrWhiteSpace(orderByQueryString))
{
var orderByClauses = orderByQueryString.Split(',').ToList();
var isThenBy = false;
orderByClauses.ForEach(obc => {
var func = QueryBuilder.BuildOrderByFunc(isThenBy, elementType, obc);
result = func(result);
isThenBy = true;
});
}
var skipQueryString = queryOptions.RawValues.Skip;
if (!string.IsNullOrWhiteSpace(skipQueryString))
{
var count = int.Parse(skipQueryString);
var method = TypeFns.GetMethodByExample((IQueryable <String> q) => Queryable.Skip <String>(q, 999), elementType);
var func = BuildIQueryableFunc(elementType, method, count);
result = func(result);
}
var topQueryString = queryOptions.RawValues.Top;
if (!string.IsNullOrWhiteSpace(topQueryString))
{
var count = int.Parse(topQueryString);
var method = TypeFns.GetMethodByExample((IQueryable <String> q) => Queryable.Take <String>(q, 999), elementType);
var func = BuildIQueryableFunc(elementType, method, count);
result = func(result);
}
request.Properties.Add("breeze_orderBy", true);
return(result);
}
protected virtual Expression VisitNode(ParseTreeNode node)
{
if (node == null)
{
return(null);
}
var nodes = node.ChildNodes;
Expression targetExpr, searchExpr, startExpr, lengthExpr;
String methodName;
switch (node.Term.Name)
{
case "BinaryExpr": {
var leftExpr = VisitNode(nodes[0]);
var operatorName = nodes[1].Token.ValueString;
var rightExpr = VisitNode(nodes[2]);
return(VisitBinary(node, operatorName, leftExpr, rightExpr));
}
case "UnaryExpr": {
var operatorName = nodes[0].Token.ValueString.ToLower();
targetExpr = VisitNode(nodes[1]);
return(VisitUnary(node, targetExpr, operatorName));
}
case "MemberExpr": {
targetExpr = _paramExpr;
ParameterExpression paramExpr;
nodes[0].ChildNodes.ForEach(n => {
var name = n.Term.Name;
if (name == "Identifier")
{
if (_lambdaVarMap.TryGetValue(n.Token.ValueString, out paramExpr))
{
targetExpr = paramExpr;
}
else
{
targetExpr = VisitMemberExpr(n, targetExpr, n.Token.ValueString);
}
}
else if (name == "AnyMethodCallExpr" || name == "AllMethodCallExpr")
{
methodName = n.ChildNodes[0].Token.ValueString;
var lambdaExprNode = n.ChildNodes[1];
var lambdaVariableName = lambdaExprNode.ChildNodes[0].Token.ValueString;
var exprNode = lambdaExprNode.ChildNodes[1];
var itemType = TypeFns.GetElementType(targetExpr.Type);
paramExpr = Expression.Parameter(itemType, lambdaVariableName);
_lambdaVarMap.Add(lambdaVariableName, paramExpr);
var lambdaSubExpr = VisitNode(exprNode);
var lambdaExpr = Expression.Lambda(lambdaSubExpr, paramExpr);
targetExpr = VisitAnyAll(n, targetExpr, methodName, lambdaExpr);
}
else
{
throw new Exception("Unable to process node: " + n.Term.Name);
}
});
return(targetExpr);
}
case "StringLiteral":
case "NumberLiteral": {
return(VisitSimpleLiteral(node, node.Token.Value));
}
case "Constant": {
return(VisitConstant(node, node.Token.ValueString));
}
case "DateTimeLiteral": {
return(VisitDateTimeLiteral(node, node.Token.ValueString));
}
case "TimeLiteral": {
return(VisitTimeLiteral(node, node.Token.ValueString));
}
case "GuidLiteral": {
return(VisitGuidLiteral(node, node.Token.ValueString));
}
case "DateTimeOffsetLiteral": {
return(VisitDateTimeOffsetLiteral(node, node.Token.ValueString));
}
case "SubstringOfMethodCallExpr": {
searchExpr = VisitNode(nodes[1]);
targetExpr = VisitNode(nodes[2]);
return(VisitSubstringOf(node, targetExpr, searchExpr));
}
case "StartsWithMethodCallExpr": {
targetExpr = VisitNode(nodes[1]);
searchExpr = VisitNode(nodes[2]);
return(VisitStartsWith(node, targetExpr, searchExpr));
}
case "EndsWithMethodCallExpr": {
targetExpr = VisitNode(nodes[1]);
searchExpr = VisitNode(nodes[2]);
return(VisitEndsWith(node, targetExpr, searchExpr));
}
case "IndexOfMethodCallExpr": {
targetExpr = VisitNode(nodes[1]);
searchExpr = VisitNode(nodes[2]);
return(VisitIndexOf(node, targetExpr, searchExpr));
}
case "Substring1MethodCallExpr": {
targetExpr = VisitNode(nodes[1]);
startExpr = VisitNode(nodes[2]);
return(VisitSubstring1(node, targetExpr, startExpr));
}
case "Substring2MethodCallExpr": {
targetExpr = VisitNode(nodes[1]);
startExpr = VisitNode(nodes[2]);
lengthExpr = VisitNode(nodes[3]);
return(VisitSubstring2(node, targetExpr, startExpr, lengthExpr));
}
case "ConcatMethodCallExpr": {
var expr1 = VisitNode(nodes[1]);
var expr2 = VisitNode(nodes[2]);
return(VisitConcat(node, expr1, expr2));
}
case "ReplaceMethodCallExpr": {
targetExpr = VisitNode(nodes[1]);
var findExpr = VisitNode(nodes[2]);
var replaceExpr = VisitNode(nodes[3]);
return(VisitReplace(node, targetExpr, findExpr, replaceExpr));
}
case "LengthMethodCallExpr": {
targetExpr = VisitNode(nodes[1]);
return(VisitLength(node, targetExpr));
}
case "TrimMethodCallExpr": {
targetExpr = VisitNode(nodes[1]);
return(VisitTrim(node, targetExpr));
}
case "ToLowerMethodCallExpr": {
targetExpr = VisitNode(nodes[1]);
return(VisitToLower(node, targetExpr));
}
case "ToUpperMethodCallExpr": {
targetExpr = VisitNode(nodes[1]);
return(VisitToUpper(node, targetExpr));
}
case "SecondMethodCallExpr":
case "MinuteMethodCallExpr":
case "HourMethodCallExpr":
case "DayMethodCallExpr":
case "MonthMethodCallExpr":
case "YearMethodCallExpr": {
methodName = nodes[0].Token.ValueString.ToLower();
targetExpr = VisitNode(nodes[1]);
return(VisitDatePart(node, targetExpr, methodName));
}
case "RoundMethodCallExpr":
case "FloorMethodCallExpr":
case "CeilingMethodCallExpr": {
methodName = nodes[0].Token.ValueString.ToLower();
targetExpr = VisitNode(nodes[1]);
return(VisitMath(node, targetExpr, methodName));
}
default: throw new Exception("Unknown Expression type: " + node.Term.Name);
}
}
private void CoerceTypes(string operatorName, ref Expression leftExpr, ref Expression rightExpr)
{
if (leftExpr.Type != rightExpr.Type)
{
var leftType = TypeFns.GetNonNullableType(leftExpr.Type);
var rightType = TypeFns.GetNonNullableType(rightExpr.Type);
if (leftType == typeof(String))
{
ConvertExpr(ref rightExpr, ref leftExpr);
}
else if (rightType == typeof(String))
{
ConvertExpr(ref leftExpr, ref rightExpr);
}
else if ((TypeFns.IsNumericType(leftType) || TypeFns.IsEnumType(leftType)) && (TypeFns.IsNumericType(rightType) || TypeFns.IsEnumType(rightType)))
{
var leftIx = NumericTypes.IndexOf(leftType);
var rightIx = NumericTypes.IndexOf(rightType);
if (leftIx < rightIx)
{
ConvertExpr(ref leftExpr, ref rightExpr);
}
else
{
ConvertExpr(ref rightExpr, ref leftExpr);
}
}
else if (leftType == typeof(Guid) ||
leftType == typeof(DateTime) ||
leftType == typeof(Boolean) ||
leftType == typeof(TimeSpan) ||
TypeFns.IsNumericType(leftType) ||
TypeFns.IsEnumType(leftType))
{
ConvertExpr(ref rightExpr, ref leftExpr);
}
else
{
throw new Exception("Unable to perform operation: " + operatorName + "on types:"
+ leftExpr.Type + ", " + rightExpr.Type);
}
}
}
