/// <summary>
/// core build query function. start point
/// </summary>
/// <param name="expr"></param>
/// <param name="paginate"></param>
/// <param name="isCountQuery"></param>
/// <param name="remoteGrouping"></param>
/// <returns></returns>
Expression BuildCore(Expression expr, bool paginate = false, bool isCountQuery = false, bool remoteGrouping = false)
{
var queryableType = typeof(Queryable);
var genericTypeArguments = new[] { typeof(T) };
// call expression with filter
if (_loadOptions.HasFilter)
{
expr = Expression.Call(queryableType, "Where", genericTypeArguments, expr, Expression.Quote(new FilterExpressionCompiler <T>(_guardNulls).Compile(_loadOptions.Filter)));
}
if (!isCountQuery)
{
if (!remoteGrouping)
{
if (_loadOptions.HasAnySort)
{
expr = new SortExpressionCompiler <T>(_guardNulls).Compile(expr, _loadOptions.GetFullSort());
}
if (_loadOptions.HasAnySelect && _loadOptions.UseRemoteSelect)
{
expr = new SelectExpressionCompiler <T>(_guardNulls).Compile(expr, _loadOptions.GetFullSelect());
#if (NET40)
genericTypeArguments = expr.Type.GetGenericArguments();
#elif (NETSTANDARD1_0 || NETSTANDARD1_1 || NETSTANDARD1_2 || NETSTANDARD1_3 || NETSTANDARD1_4 || NETSTANDARD1_5 || NETSTANDARD1_6 || NETSTANDARD2_0)
genericTypeArguments = expr.Type.GetTypeInfo().IsGenericTypeDefinition ? expr.Type.GetTypeInfo().GenericTypeParameters : expr.Type.GetTypeInfo().GenericTypeArguments;
#elif (NETCOREAPP1_0 || NETCOREAPP1_1 || NETCOREAPP2_0 || NETCOREAPP2_1)
IEnumerable <Type> arguments = expr.Type.IsGenericTypeDefinition
? expr.Type.GenericTypeParameters
: expr.Type.GenericTypeArguments;
genericTypeArguments = arguments.Select(x => x.GetTypeInfo()).ToArray();
#endif
}
}
else
{
expr = new RemoteGroupExpressionCompiler <T>(_guardNulls, _loadOptions.Group, _loadOptions.TotalSummary, _loadOptions.GroupSummary).Compile(expr);
}
if (paginate)
{
if (_loadOptions.Skip > 0)
{
expr = Expression.Call(queryableType, "Skip", genericTypeArguments, expr, Expression.Constant(_loadOptions.Skip));
}
if (_loadOptions.Take > 0)
{
expr = Expression.Call(queryableType, "Take", genericTypeArguments, expr, Expression.Constant(_loadOptions.Take));
}
}
}
if (isCountQuery)
{
expr = Expression.Call(queryableType, "Count", genericTypeArguments, expr);
}
return(expr);
}
IEnumerable<AnonType> ExecWithSelect(Expression loadExpr) {
if(Options.UseRemoteSelect)
return ExecExpr<AnonType>(Source, loadExpr);
var inMemoryQuery = ForceExecution(ExecExpr<S>(Source, loadExpr)).AsQueryable();
var selectExpr = new SelectExpressionCompiler<S>(true).Compile(inMemoryQuery.Expression, Options.GetFullSelect());
return ExecExpr<AnonType>(inMemoryQuery, selectExpr);
}
Expression BuildCore(Expression expr, bool paginate = false, bool isCountQuery = false, bool remoteGrouping = false, IList filterOverride = null, IReadOnlyList <string> selectOverride = null)
{
var queryableType = typeof(Queryable);
var genericTypeArguments = new[] { typeof(T) };
if (filterOverride != null || _context.HasFilter)
{
var filterExpr = filterOverride != null && filterOverride.Count < 1
? Expression.Lambda(Expression.Constant(false), Expression.Parameter(typeof(T)))
: new FilterExpressionCompiler <T>(_guardNulls, _context.UseStringToLower).Compile(filterOverride ?? _context.Filter);
expr = Expression.Call(queryableType, "Where", genericTypeArguments, expr, Expression.Quote(filterExpr));
}
if (!isCountQuery)
{
if (!remoteGrouping)
{
if (_context.HasAnySort)
{
expr = new SortExpressionCompiler <T>(_guardNulls).Compile(expr, _context.GetFullSort());
}
if (selectOverride != null || _context.HasAnySelect && _context.UseRemoteSelect)
{
expr = new SelectExpressionCompiler <T>(_guardNulls).Compile(expr, selectOverride ?? _context.FullSelect);
genericTypeArguments = expr.Type.GetGenericArguments();
}
}
else
{
expr = new RemoteGroupExpressionCompiler <T>(_guardNulls, _anonTypeNewTweaks, _context.Group, _context.TotalSummary, _context.GroupSummary).Compile(expr);
}
if (paginate)
{
if (_context.Skip > 0)
{
expr = Expression.Call(queryableType, "Skip", genericTypeArguments, expr, Expression.Constant(_context.Skip));
}
if (_context.Take > 0)
{
expr = Expression.Call(queryableType, "Take", genericTypeArguments, expr, Expression.Constant(_context.Take));
}
}
}
if (isCountQuery)
{
expr = Expression.Call(queryableType, "Count", genericTypeArguments, expr);
}
return(expr);
}
Expression BuildCore(Expression expr, bool paginate = false, bool isCountQuery = false, bool remoteGrouping = false)
{
var queryableType = typeof(Queryable);
var genericTypeArguments = new[] { typeof(T) };
if (_loadOptions.HasFilter)
{
expr = Expression.Call(queryableType, "Where", genericTypeArguments, expr, Expression.Quote(new FilterExpressionCompiler <T>(_guardNulls).Compile(_loadOptions.Filter)));
}
if (!isCountQuery)
{
if (!remoteGrouping)
{
if (_loadOptions.HasAnySort)
{
expr = new SortExpressionCompiler <T>(_guardNulls).Compile(expr, _loadOptions.GetFullSort());
}
if (_loadOptions.HasSelect)
{
expr = new SelectExpressionCompiler <T>(_guardNulls).Compile(expr, _loadOptions.Select);
genericTypeArguments = expr.Type.GetGenericArguments();
}
}
else
{
expr = new RemoteGroupExpressionCompiler <T>(_loadOptions.Group, _loadOptions.TotalSummary, _loadOptions.GroupSummary).Compile(expr);
}
if (paginate)
{
if (_loadOptions.Skip > 0)
{
expr = Expression.Call(queryableType, "Skip", genericTypeArguments, expr, Expression.Constant(_loadOptions.Skip));
}
if (_loadOptions.Take > 0)
{
expr = Expression.Call(queryableType, "Take", genericTypeArguments, expr, Expression.Constant(_loadOptions.Take));
}
}
}
if (isCountQuery)
{
expr = Expression.Call(queryableType, "Count", genericTypeArguments, expr);
}
return(expr);
}
public LoadResult Load()
{
if (Options.IsCountQuery)
{
return new LoadResult {
totalCount = ExecCount()
}
}
;
var result = new LoadResult();
if (CanUseRemoteGrouping && ShouldEmptyGroups)
{
var groupingResult = ExecRemoteGrouping();
EmptyGroups(groupingResult.Groups, Options.Group.Length);
result.data = Paginate(groupingResult.Groups, Options.Skip, Options.Take);
result.summary = groupingResult.Totals;
result.totalCount = groupingResult.TotalCount;
if (Options.RequireGroupCount)
{
result.groupCount = groupingResult.Groups.Count();
}
}
else
{
if (!Options.HasPrimaryKey)
{
Options.PrimaryKey = Utils.GetPrimaryKey(typeof(S));
}
if (!Options.HasPrimaryKey && !Options.HasDefaultSort && (Options.Skip > 0 || Options.Take > 0))
{
if (Compat.IsEntityFramework(Source.Provider))
{
Options.DefaultSort = EFSorting.FindSortableMember(typeof(S));
}
else if (Compat.IsXPO(Source.Provider))
{
Options.DefaultSort = "this";
}
}
var deferPaging = Options.HasGroups || !CanUseRemoteGrouping && !SummaryIsTotalCountOnly && Options.HasSummary;
var loadExpr = Builder.BuildLoadExpr(Source.Expression, !deferPaging);
if (Options.HasAnySelect)
{
ContinueWithGrouping(
ExecWithSelect(loadExpr).Select(ProjectionToExpando),
result
);
}
else
{
ContinueWithGrouping(
ExecExpr <S>(Source, loadExpr),
result
);
}
if (deferPaging)
{
result.data = Paginate(result.data, Options.Skip, Options.Take);
}
if (ShouldEmptyGroups)
{
EmptyGroups(result.data, Options.Group.Length);
}
}
return(result);
}
IEnumerable <AnonType> ExecWithSelect(Expression loadExpr)
{
if (Options.UseRemoteSelect)
{
return(ExecExpr <AnonType>(Source, loadExpr));
}
var inMemoryQuery = ForceExecution(ExecExpr <S>(Source, loadExpr)).AsQueryable();
var selectExpr = new SelectExpressionCompiler <S>(true).Compile(inMemoryQuery.Expression, Options.GetFullSelect());
return(ExecExpr <AnonType>(inMemoryQuery, selectExpr));
}
void ContinueWithGrouping <R>(IEnumerable <R> loadResult, LoadResult result)
{
var accessor = new DefaultAccessor <R>();
if (Options.HasGroups)
{
var groups = new GroupHelper <R>(accessor).Group(loadResult, Options.Group);
if (Options.RequireGroupCount)
{
result.groupCount = groups.Count;
}
ContinueWithAggregation(groups, accessor, result);
}
else
{
ContinueWithAggregation(loadResult, accessor, result);
}
}
void ContinueWithAggregation <R>(IEnumerable data, IAccessor <R> accessor, LoadResult result)
{
if (CanUseRemoteGrouping && !SummaryIsTotalCountOnly && Options.HasSummary && !Options.HasGroups)
{
var groupingResult = ExecRemoteGrouping();
result.totalCount = groupingResult.TotalCount;
result.summary = groupingResult.Totals;
}
else
{
var totalCount = -1;
if (Options.RequireTotalCount || SummaryIsTotalCountOnly)
{
totalCount = ExecCount();
}
if (Options.RequireTotalCount)
{
result.totalCount = totalCount;
}
if (SummaryIsTotalCountOnly)
{
result.summary = Enumerable.Repeat((object)totalCount, Options.TotalSummary.Length).ToArray();
}
else if (Options.HasSummary)
{
data = Buffer <R>(data);
result.summary = new AggregateCalculator <R>(data, accessor, Options.TotalSummary, Options.GroupSummary).Run();
}
}
result.data = data;
}
int ExecCount()
{
var expr = Builder.BuildCountExpr(Source.Expression);
#if DEBUG
Options.ExpressionWatcher?.Invoke(expr);
#endif
return(Source.Provider.Execute <int>(expr));
}
RemoteGroupingResult ExecRemoteGrouping()
{
return(RemoteGroupTransformer.Run(
ExecExpr <AnonType>(Source, Builder.BuildLoadGroupsExpr(Source.Expression)),
Options.HasGroups ? Options.Group.Length : 0,
Options.TotalSummary,
Options.GroupSummary
));
}
IEnumerable <R> ExecExpr <R>(IQueryable <S> source, Expression expr)
{
IEnumerable <R> result = source.Provider.CreateQuery <R>(expr);
#if DEBUG
if (Options.UseEnumerableOnce)
{
result = new EnumerableOnce <R>(result);
}
Options.ExpressionWatcher?.Invoke(expr);
#endif
return(result);
}