private static MethodCallExpression CountExpression(ParameterExpression sourceParameter)
{
Type itemType = OeExpressionHelper.GetCollectionItemType(sourceParameter.Type);
MethodInfo countMethodInfo = OeMethodInfoHelper.GetCountMethodInfo(itemType);
return(Expression.Call(countMethodInfo, sourceParameter));
}
public override Expression Translate(ExpandedNavigationSelectItem item)
{
var segment = (NavigationPropertySegment)item.PathToNavigationProperty.LastSegment;
Expression expression = Translate(segment);
Type navigationItemType = expression.Type;
Type itemType = OeExpressionHelper.GetCollectionItemType(navigationItemType);
if (itemType != null)
{
var expressionBuilder = new OeExpressionBuilder(_model, itemType);
expression = expressionBuilder.ApplyFilter(expression, item.FilterOption);
expression = expressionBuilder.ApplyOrderBy(expression, item.OrderByOption);
var path = new ODataPath(_path.Union(item.PathToNavigationProperty));
expression = expressionBuilder.ApplySkip(expression, item.SkipOption, path);
expression = expressionBuilder.ApplyTake(expression, item.TopOption, path);
foreach (KeyValuePair <ConstantExpression, ConstantNode> constant in expressionBuilder.Constants)
{
_visitor.AddConstant(constant.Key, constant.Value);
}
}
Expression countExpression = null;
if (item.CountOption.GetValueOrDefault())
{
MethodInfo countMethodInfo = OeMethodInfoHelper.GetCountMethodInfo(itemType);
countExpression = Expression.Call(countMethodInfo, expression);
}
if (item.SelectAndExpand.SelectedItems.Any())
{
var path = new ODataPath(_path.Union(item.PathToNavigationProperty));
var selectTranslator = new OeSelectTranslator(_visitor, path);
Expression nestedExpression = selectTranslator.CreateExpression(expression, item.SelectAndExpand, OeMetadataLevel.Minimal);
Type nestedType = OeExpressionHelper.GetCollectionItemType(nestedExpression.Type);
if (nestedType == null)
{
var visitor = new ParameterVisitor(selectTranslator._parameter, expression);
nestedExpression = visitor.Visit(nestedExpression);
nestedType = nestedExpression.Type;
}
_selectItemInfo.EntryFactory = selectTranslator.CreateNestedEntryFactory(nestedType, _selectItemInfo.EntitySet, _selectItemInfo.ResourceInfo);
expression = nestedExpression;
}
if (countExpression != null)
{
return(CreateNavigationLinkInfo(navigationItemType, expression, countExpression));
}
return(expression);
}
public Expression CreateCountExpression(IQueryable query, Expression expression)
{
Type filterType = EntryFactory == null ? query.ElementType : EdmModel.GetClrType(EntryFactory.EntityType);
Expression filterExpression = ODataUri.Filter == null ? query.Expression : FilterVisitor.Translate(query, expression, filterType);
Type sourceType = OeExpressionHelper.GetCollectionItemType(filterExpression.Type);
MethodInfo countMethodInfo = OeMethodInfoHelper.GetCountMethodInfo(sourceType);
return(Expression.Call(countMethodInfo, filterExpression));
}
public Expression ApplyCount(Expression source, bool?queryCount)
{
if (!queryCount.GetValueOrDefault())
{
return(source);
}
MethodInfo countMethodInfo = OeMethodInfoHelper.GetCountMethodInfo(ParameterType);
return(Expression.Call(countMethodInfo, source));
}
private static MethodCallExpression CountDistinctExpression(ParameterExpression sourceParameter, LambdaExpression lambda)
{
MethodInfo selectMetodInfo = OeMethodInfoHelper.GetSelectMethodInfo(lambda.Parameters[0].Type, lambda.ReturnType);
MethodCallExpression selectCall = Expression.Call(selectMetodInfo, sourceParameter, lambda);
MethodInfo distinctMethodInfo = OeMethodInfoHelper.GetDistinctMethodInfo(lambda.ReturnType);
MethodCallExpression distinctCall = Expression.Call(distinctMethodInfo, selectCall);
MethodInfo countMethodInfo = OeMethodInfoHelper.GetCountMethodInfo(lambda.ReturnType);
return(Expression.Call(countMethodInfo, distinctCall));
}
public static MethodCallExpression CreateCountExpression(Expression expression)
{
var filterVisitor = new FilterVisitor();
filterVisitor.Visit(expression);
Expression whereExpression = filterVisitor.WhereExpression;
if (whereExpression == null)
{
whereExpression = filterVisitor.Source;
}
Type sourceType = OeExpressionHelper.GetCollectionItemType(whereExpression.Type);
MethodInfo countMethodInfo = OeMethodInfoHelper.GetCountMethodInfo(sourceType);
return(Expression.Call(countMethodInfo, whereExpression));
}
public MethodCallExpression CreateCountExpression(Expression source)
{
if (EntryFactory == null)
{
throw new InvalidOperationException("Cannot get count expression for scalar result expression");
}
Type sourceType = EdmModel.GetClrType(EntryFactory.EntitySet);
var filterVisitor = new FilterVisitor(sourceType);
filterVisitor.Visit(source);
Expression?whereExpression = filterVisitor.WhereExpression;
if (whereExpression == null)
{
whereExpression = filterVisitor.Source;
}
MethodInfo countMethodInfo = OeMethodInfoHelper.GetCountMethodInfo(sourceType);
return(Expression.Call(countMethodInfo, whereExpression));
}
public MethodCallExpression CreateCountExpression(Expression source)
{
if (EntryFactory == null)
{
return(null);
}
Type sourceType = EdmModel.GetClrType(EntryFactory.EntitySet);
var filterVisitor = new FilterVisitor(sourceType);
filterVisitor.Visit(source);
Expression whereExpression = filterVisitor.WhereExpression;
if (whereExpression == null)
{
whereExpression = filterVisitor.Source;
}
MethodInfo countMethodInfo = OeMethodInfoHelper.GetCountMethodInfo(sourceType);
return(Expression.Call(countMethodInfo, whereExpression));
}
