Mercurial > pub > bltoolkit
annotate Source/Data/Linq/Builder/ExpressionBuilder.cs @ 9:1e85f66cf767 default tip
update bltoolkit
| author | nickolay |
|---|---|
| date | Thu, 05 Apr 2018 20:53:26 +0300 |
| parents | 11b6da379593 |
| children |
| rev | line source |
|---|---|
| 0 | 1 using System; |
| 2 using System.Collections; | |
| 3 using System.Collections.Generic; | |
| 4 using System.Data; | |
| 5 using System.Linq; | |
| 6 using System.Linq.Expressions; | |
| 7 using System.Reflection; | |
| 8 | |
| 9 namespace BLToolkit.Data.Linq.Builder | |
| 10 { | |
| 11 using BLToolkit.Linq; | |
| 12 using Common; | |
| 13 using Data.Sql; | |
| 14 using Data.Sql.SqlProvider; | |
| 15 using Mapping; | |
| 16 using Reflection; | |
| 17 | |
| 18 public partial class ExpressionBuilder | |
| 19 { | |
| 20 #region Sequence | |
| 21 | |
| 22 static readonly object _sync = new object(); | |
| 23 | |
| 24 static List<ISequenceBuilder> _sequenceBuilders = new List<ISequenceBuilder> | |
| 25 { | |
| 26 new TableBuilder (), | |
| 27 new SelectBuilder (), | |
| 28 new SelectManyBuilder (), | |
| 29 new WhereBuilder (), | |
| 30 new OrderByBuilder (), | |
| 31 new GroupByBuilder (), | |
| 32 new JoinBuilder (), | |
| 33 new TakeSkipBuilder (), | |
| 34 new DefaultIfEmptyBuilder(), | |
| 35 new DistinctBuilder (), | |
| 36 new FirstSingleBuilder (), | |
| 37 new AggregationBuilder (), | |
| 38 new ScalarSelectBuilder (), | |
| 39 new CountBuilder (), | |
| 40 new PassThroughBuilder (), | |
| 41 new TableAttributeBuilder(), | |
| 42 new InsertBuilder (), | |
| 43 new InsertBuilder.Into (), | |
| 44 new InsertBuilder.Value (), | |
| 45 new InsertOrUpdateBuilder(), | |
| 46 new UpdateBuilder (), | |
| 47 new UpdateBuilder.Set (), | |
| 48 new DeleteBuilder (), | |
| 49 new ContainsBuilder (), | |
| 50 new AllAnyBuilder (), | |
| 51 new ConcatUnionBuilder (), | |
| 52 new IntersectBuilder (), | |
| 53 new CastBuilder (), | |
| 54 new OfTypeBuilder (), | |
| 55 new AsUpdatableBuilder (), | |
| 56 }; | |
| 57 | |
| 58 public static void AddBuilder(ISequenceBuilder builder) | |
| 59 { | |
| 60 _sequenceBuilders.Add(builder); | |
| 61 } | |
| 62 | |
| 63 #endregion | |
| 64 | |
| 65 #region Init | |
| 66 | |
| 67 readonly Query _query; | |
| 68 readonly List<ISequenceBuilder> _builders = _sequenceBuilders; | |
| 69 private bool _reorder; | |
| 70 readonly Dictionary<Expression,Expression> _expressionAccessors; | |
| 71 private HashSet<Expression> _subQueryExpressions; | |
| 72 | |
| 73 readonly public List<ParameterAccessor> CurrentSqlParameters = new List<ParameterAccessor>(); | |
| 74 | |
| 75 #if FW4 || SILVERLIGHT | |
| 76 | |
| 77 readonly public List<ParameterExpression> BlockVariables = new List<ParameterExpression>(); | |
| 78 readonly public List<Expression> BlockExpressions = new List<Expression>(); | |
| 79 public bool IsBlockDisable; | |
| 80 | |
| 81 #else | |
| 82 public bool IsBlockDisable = true; | |
| 83 #endif | |
| 84 | |
| 85 readonly HashSet<Expression> _visitedExpressions; | |
| 86 | |
| 87 public ExpressionBuilder( | |
| 88 Query query, | |
| 89 IDataContextInfo dataContext, | |
| 90 Expression expression, | |
| 91 ParameterExpression[] compiledParameters) | |
| 92 { | |
| 93 _query = query; | |
| 94 _expressionAccessors = expression.GetExpressionAccessors(ExpressionParam); | |
| 95 | |
| 96 CompiledParameters = compiledParameters; | |
| 97 DataContextInfo = dataContext; | |
| 98 OriginalExpression = expression; | |
| 99 | |
| 100 _visitedExpressions = new HashSet<Expression>(); | |
| 101 Expression = ConvertExpressionTree(expression); | |
| 102 _visitedExpressions = null; | |
| 103 } | |
| 104 | |
| 105 #endregion | |
| 106 | |
| 107 #region Public Members | |
| 108 | |
| 109 public readonly IDataContextInfo DataContextInfo; | |
| 110 public readonly Expression OriginalExpression; | |
| 111 public readonly Expression Expression; | |
| 112 public readonly ParameterExpression[] CompiledParameters; | |
| 113 public readonly List<IBuildContext> Contexts = new List<IBuildContext>(); | |
| 114 | |
| 115 private ISqlProvider _sqlProvider; | |
| 116 public ISqlProvider SqlProvider | |
| 117 { | |
| 118 get { return _sqlProvider ?? (_sqlProvider = DataContextInfo.CreateSqlProvider()); } | |
| 119 } | |
| 120 | |
| 121 public static readonly ParameterExpression ContextParam = Expression.Parameter(typeof(QueryContext), "context"); | |
| 122 public static readonly ParameterExpression DataContextParam = Expression.Parameter(typeof(IDataContext), "dctx"); | |
| 123 public static readonly ParameterExpression DataReaderParam = Expression.Parameter(typeof(IDataReader), "rd"); | |
| 124 public static readonly ParameterExpression ParametersParam = Expression.Parameter(typeof(object[]), "ps"); | |
| 125 public static readonly ParameterExpression ExpressionParam = Expression.Parameter(typeof(Expression), "expr"); | |
| 126 | |
| 127 public MappingSchema MappingSchema | |
| 128 { | |
| 129 get { return DataContextInfo.MappingSchema; } | |
| 130 } | |
| 131 | |
| 132 #endregion | |
| 133 | |
| 134 #region Builder SQL | |
| 135 | |
| 136 internal Query<T> Build<T>() | |
| 137 { | |
| 138 var sequence = BuildSequence(new BuildInfo((IBuildContext)null, Expression, new SqlQuery())); | |
| 139 | |
| 140 if (_reorder) | |
| 141 lock (_sync) | |
| 142 { | |
| 143 _reorder = false; | |
| 144 _sequenceBuilders = _sequenceBuilders.OrderByDescending(_ => _.BuildCounter).ToList(); | |
| 145 } | |
| 146 | |
| 147 _query.Init(sequence, CurrentSqlParameters); | |
| 148 | |
| 149 var param = Expression.Parameter(typeof(Query<T>), "info"); | |
| 150 | |
| 151 sequence.BuildQuery((Query<T>)_query, param); | |
| 152 | |
| 153 return (Query<T>)_query; | |
| 154 } | |
| 155 | |
| 156 [JetBrains.Annotations.NotNull] | |
| 157 public IBuildContext BuildSequence(BuildInfo buildInfo) | |
| 158 { | |
| 159 buildInfo.Expression = buildInfo.Expression.Unwrap(); | |
| 160 | |
| 161 var n = _builders[0].BuildCounter; | |
| 162 | |
| 163 foreach (var builder in _builders) | |
| 164 { | |
| 165 if (builder.CanBuild(this, buildInfo)) | |
| 166 { | |
| 167 var sequence = builder.BuildSequence(this, buildInfo); | |
| 168 | |
| 169 lock (builder) | |
| 170 builder.BuildCounter++; | |
| 171 | |
| 172 _reorder = _reorder || n < builder.BuildCounter; | |
| 173 | |
| 174 return sequence; | |
| 175 } | |
| 176 | |
| 177 n = builder.BuildCounter; | |
| 178 } | |
| 179 | |
| 180 throw new LinqException("Sequence '{0}' cannot be converted to SQL.", buildInfo.Expression); | |
| 181 } | |
| 182 | |
| 183 public SequenceConvertInfo ConvertSequence(BuildInfo buildInfo, ParameterExpression param) | |
| 184 { | |
| 185 buildInfo.Expression = buildInfo.Expression.Unwrap(); | |
| 186 | |
| 187 foreach (var builder in _builders) | |
| 188 if (builder.CanBuild(this, buildInfo)) | |
| 189 return builder.Convert(this, buildInfo, param); | |
| 190 | |
| 191 throw new LinqException("Sequence '{0}' cannot be converted to SQL.", buildInfo.Expression); | |
| 192 } | |
| 193 | |
| 194 public bool IsSequence(BuildInfo buildInfo) | |
| 195 { | |
| 196 buildInfo.Expression = buildInfo.Expression.Unwrap(); | |
| 197 | |
| 198 foreach (var builder in _builders) | |
| 199 if (builder.CanBuild(this, buildInfo)) | |
| 200 return builder.IsSequence(this, buildInfo); | |
| 201 | |
| 202 return false; | |
| 203 } | |
| 204 | |
| 205 #endregion | |
| 206 | |
| 207 #region ConvertExpression | |
| 208 | |
| 209 public ParameterExpression SequenceParameter; | |
| 210 | |
| 211 Expression ConvertExpressionTree(Expression expression) | |
| 212 { | |
| 213 var expr = ConvertParameters(expression); | |
| 214 | |
| 215 expr = ExposeExpression (expr); | |
| 216 expr = OptimizeExpression(expr); | |
| 217 | |
| 218 var paramType = expr.Type; | |
| 219 var isQueryable = false; | |
| 220 | |
| 221 if (expression.NodeType == ExpressionType.Call) | |
| 222 { | |
| 223 var call = (MethodCallExpression)expression; | |
| 224 | |
| 225 if (call.IsQueryable() && call.Object == null && call.Arguments.Count > 0 && call.Type.IsGenericType) | |
| 226 { | |
| 227 var type = call.Type.GetGenericTypeDefinition(); | |
| 228 | |
| 229 if (type == typeof(IQueryable<>) || type == typeof(IEnumerable<>)) | |
| 230 { | |
| 231 var arg = call.Type.GetGenericArguments(); | |
| 232 | |
| 233 if (arg.Length == 1) | |
| 234 { | |
| 235 paramType = arg[0]; | |
| 236 isQueryable = true; | |
| 237 } | |
| 238 } | |
| 239 } | |
| 240 } | |
| 241 | |
| 242 SequenceParameter = Expression.Parameter(paramType, "cp"); | |
| 243 | |
| 244 var sequence = ConvertSequence(new BuildInfo((IBuildContext)null, expr, new SqlQuery()), SequenceParameter); | |
| 245 | |
| 246 if (sequence != null) | |
| 247 { | |
| 248 if (sequence.Expression.Type != expr.Type) | |
| 249 { | |
| 250 if (isQueryable) | |
| 251 { | |
| 252 var p = sequence.ExpressionsToReplace.SingleOrDefault(s => s.Path.NodeType == ExpressionType.Parameter); | |
| 253 | |
| 254 return Expression.Call( | |
| 255 ((MethodCallExpression)expr).Method.DeclaringType, | |
| 256 "Select", | |
| 257 new[] { p.Path.Type, paramType }, | |
| 258 sequence.Expression, | |
| 259 Expression.Lambda(p.Expr, (ParameterExpression)p.Path)); | |
| 260 } | |
| 261 | |
| 262 throw new InvalidOperationException(); | |
| 263 } | |
| 264 | |
| 265 return sequence.Expression; | |
| 266 } | |
| 267 | |
| 268 return expr; | |
| 269 } | |
| 270 | |
| 271 #region ConvertParameters | |
| 272 | |
| 273 Expression ConvertParameters(Expression expression) | |
| 274 { | |
| 275 return expression.Convert(expr => | |
| 276 { | |
| 277 switch (expr.NodeType) | |
| 278 { | |
| 279 case ExpressionType.Parameter: | |
| 280 if (CompiledParameters != null) | |
| 281 { | |
| 282 var idx = Array.IndexOf(CompiledParameters, (ParameterExpression)expr); | |
| 283 | |
| 284 if (idx > 0) | |
| 285 return | |
| 286 Expression.Convert( | |
| 287 Expression.ArrayIndex( | |
| 288 ParametersParam, | |
| 289 Expression.Constant(Array.IndexOf(CompiledParameters, (ParameterExpression)expr))), | |
| 290 expr.Type); | |
| 291 } | |
| 292 | |
| 293 break; | |
| 294 } | |
| 295 | |
| 296 return expr; | |
| 297 }); | |
| 298 } | |
| 299 | |
| 300 #endregion | |
| 301 | |
| 302 #region ExposeExpression | |
| 303 | |
| 304 Expression ExposeExpression(Expression expression) | |
| 305 { | |
| 306 return expression.Convert(expr => | |
| 307 { | |
| 308 switch (expr.NodeType) | |
| 309 { | |
| 310 case ExpressionType.MemberAccess: | |
| 311 { | |
| 312 var me = (MemberExpression)expr; | |
| 313 var l = ConvertMethodExpression(me.Member); | |
| 314 | |
| 315 if (l != null) | |
| 316 { | |
| 317 var body = l.Body.Unwrap(); | |
| 318 var ex = body.Convert2(wpi => new ExpressionHelper.ConvertInfo(wpi.NodeType == ExpressionType.Parameter ? me.Expression : wpi)); | |
| 319 | |
| 320 if (ex.Type != expr.Type) | |
| 321 ex = new ChangeTypeExpression(ex, expr.Type); | |
| 322 | |
| 323 return ExposeExpression(ex); | |
| 324 } | |
| 325 | |
| 326 break; | |
| 327 } | |
| 328 | |
| 329 case ExpressionType.Constant : | |
| 330 { | |
| 331 var c = (ConstantExpression)expr; | |
| 332 | |
| 333 // Fix Mono behaviour. | |
| 334 // | |
| 335 //if (c.Value is IExpressionQuery) | |
| 336 // return ((IQueryable)c.Value).Expression; | |
| 337 | |
| 338 if (c.Value is IQueryable && !(c.Value is ITable)) | |
| 339 { | |
| 340 var e = ((IQueryable)c.Value).Expression; | |
| 341 | |
| 342 if (!_visitedExpressions.Contains(e)) | |
| 343 { | |
| 344 _visitedExpressions.Add(e); | |
| 345 return ExposeExpression(e); | |
| 346 } | |
| 347 } | |
| 348 | |
| 349 break; | |
| 350 } | |
| 351 } | |
| 352 | |
| 353 return expr; | |
| 354 }); | |
| 355 } | |
| 356 | |
| 357 #endregion | |
| 358 | |
| 359 #region OptimizeExpression | |
| 360 | |
| 361 private MethodInfo[] _enumerableMethods; | |
| 362 public MethodInfo[] EnumerableMethods | |
| 363 { | |
| 364 get { return _enumerableMethods ?? (_enumerableMethods = typeof(Enumerable).GetMethods()); } | |
| 365 } | |
| 366 | |
| 367 private MethodInfo[] _queryableMethods; | |
| 368 public MethodInfo[] QueryableMethods | |
| 369 { | |
| 370 get { return _queryableMethods ?? (_queryableMethods = typeof(Queryable).GetMethods()); } | |
| 371 } | |
| 372 | |
| 373 readonly Dictionary<Expression,Expression> _optimizedExpressions = new Dictionary<Expression,Expression>(); | |
| 374 | |
| 375 Expression OptimizeExpression(Expression expression) | |
| 376 { | |
| 377 Expression expr; | |
| 378 | |
| 379 if (_optimizedExpressions.TryGetValue(expression, out expr)) | |
| 380 return expr; | |
| 381 | |
| 382 _optimizedExpressions[expression] = expr = expression.Convert(OptimizeExpressionImpl); | |
| 383 | |
| 384 return expr; | |
| 385 } | |
| 386 | |
| 387 Expression OptimizeExpressionImpl(Expression expr) | |
| 388 { | |
| 389 switch (expr.NodeType) | |
| 390 { | |
| 391 case ExpressionType.MemberAccess: | |
| 392 { | |
| 393 var me = (MemberExpression)expr; | |
| 394 | |
| 395 // Replace Count with Count() | |
| 396 // | |
| 397 if (me.Member.Name == "Count") | |
| 398 { | |
| 399 var isList = typeof(ICollection).IsAssignableFrom(me.Member.DeclaringType); | |
| 400 | |
| 401 if (!isList) | |
| 402 isList = me.Member.DeclaringType.GetInterfaces() | |
| 403 .Any(t => t.IsGenericType && t.GetGenericTypeDefinition() == typeof(IList<>)); | |
| 404 | |
| 405 if (isList) | |
| 406 { | |
| 407 var mi = EnumerableMethods | |
| 408 .First(m => m.Name == "Count" && m.GetParameters().Length == 1) | |
| 409 .MakeGenericMethod(TypeHelper.GetElementType(me.Expression.Type)); | |
| 410 | |
| 411 return Expression.Call(null, mi, me.Expression); | |
| 412 } | |
| 413 } | |
| 414 | |
| 415 if (CompiledParameters == null && TypeHelper.IsSameOrParent(typeof(IQueryable), expr.Type)) | |
| 416 { | |
| 417 var ex = ConvertIQueriable(expr); | |
| 418 | |
| 419 if (ex != expr) | |
| 420 return ConvertExpressionTree(ex); | |
| 421 } | |
| 422 | |
| 423 return ConvertSubquery(expr); | |
| 424 } | |
| 425 | |
| 426 case ExpressionType.Call : | |
| 427 { | |
| 428 var call = (MethodCallExpression)expr; | |
| 429 | |
| 430 if (call.IsQueryable()) | |
| 431 { | |
| 432 switch (call.Method.Name) | |
| 433 { | |
| 434 case "Where" : return ConvertWhere (call); | |
| 435 case "GroupBy" : return ConvertGroupBy (call); | |
| 436 case "SelectMany" : return ConvertSelectMany(call); | |
| 437 case "Select" : return ConvertSelect (call); | |
| 438 case "LongCount" : | |
| 439 case "Count" : | |
| 440 case "Single" : | |
| 441 case "SingleOrDefault" : | |
| 442 case "First" : | |
| 443 case "FirstOrDefault" : return ConvertPredicate (call); | |
| 444 case "Min" : | |
| 445 case "Max" : return ConvertSelector (call, true); | |
| 446 case "Sum" : | |
| 447 case "Average" : return ConvertSelector (call, false); | |
| 448 case "ElementAt" : | |
| 449 case "ElementAtOrDefault" : return ConvertElementAt (call); | |
| 450 } | |
| 451 } | |
| 452 else | |
| 453 { | |
| 454 var l = ConvertMethodExpression(call.Method); | |
| 455 | |
| 456 if (l != null) | |
| 457 return OptimizeExpression(ConvertMethod(call, l)); | |
| 458 | |
| 459 if (CompiledParameters == null && TypeHelper.IsSameOrParent(typeof(IQueryable), expr.Type)) | |
| 460 { | |
| 461 var attr = GetTableFunctionAttribute(call.Method); | |
| 462 | |
| 463 if (attr == null) | |
| 464 { | |
| 465 var ex = ConvertIQueriable(expr); | |
| 466 | |
| 467 if (ex != expr) | |
| 468 return ConvertExpressionTree(ex); | |
| 469 } | |
| 470 } | |
| 471 } | |
| 472 | |
| 473 return ConvertSubquery(expr); | |
| 474 } | |
| 475 } | |
| 476 | |
| 477 return expr; | |
| 478 } | |
| 479 | |
| 480 LambdaExpression ConvertMethodExpression(MemberInfo mi) | |
| 481 { | |
| 482 var attrs = mi.GetCustomAttributes(typeof(MethodExpressionAttribute), true); | |
| 483 | |
| 484 if (attrs.Length == 0) | |
| 485 return null; | |
| 486 | |
| 487 MethodExpressionAttribute attr = null; | |
| 488 | |
| 489 foreach (MethodExpressionAttribute a in attrs) | |
| 490 { | |
| 491 if (a.SqlProvider == SqlProvider.Name) | |
| 492 { | |
| 493 attr = a; | |
| 494 break; | |
| 495 } | |
| 496 | |
| 497 if (a.SqlProvider == null) | |
| 498 attr = a; | |
| 499 } | |
| 500 | |
| 501 if (attr != null) | |
| 502 { | |
| 503 Expression expr; | |
| 504 | |
| 505 if (mi is MethodInfo && ((MethodInfo)mi).IsGenericMethod) | |
| 506 { | |
| 507 var method = (MethodInfo)mi; | |
| 508 var args = method.GetGenericArguments(); | |
| 509 var names = args.Select(t => t.Name).ToArray(); | |
| 510 var name = string.Format(attr.MethodName, names); | |
| 511 | |
| 512 if (name != attr.MethodName) | |
| 513 expr = Expression.Call(mi.DeclaringType, name, Array<Type>.Empty); | |
| 514 else | |
| 515 expr = Expression.Call(mi.DeclaringType, name, args); | |
| 516 } | |
| 517 else | |
| 518 { | |
| 519 expr = Expression.Call(mi.DeclaringType, attr.MethodName, Array<Type>.Empty); | |
| 520 } | |
| 521 | |
| 522 var call = Expression.Lambda<Func<LambdaExpression>>(Expression.Convert(expr, typeof(LambdaExpression))); | |
| 523 | |
| 524 return call.Compile()(); | |
| 525 } | |
| 526 | |
| 527 return null; | |
| 528 } | |
| 529 | |
| 530 Expression ConvertSubquery(Expression expr) | |
| 531 { | |
| 532 var ex = expr; | |
| 533 | |
| 534 while (ex != null) | |
| 535 { | |
| 536 switch (ex.NodeType) | |
| 537 { | |
| 538 default : return expr; | |
| 539 case ExpressionType.MemberAccess : ex = ((MemberExpression)ex).Expression; break; | |
| 540 case ExpressionType.Call : | |
| 541 { | |
| 542 var call = (MethodCallExpression)ex; | |
| 543 | |
| 544 if (call.Object == null) | |
| 545 { | |
| 546 if (call.IsQueryable()) switch (call.Method.Name) | |
| 547 { | |
| 548 case "Single" : | |
| 549 case "SingleOrDefault" : | |
| 550 case "First" : | |
| 551 case "FirstOrDefault" : | |
| 552 return ConvertSingleOrFirst(expr, call); | |
| 553 } | |
| 554 | |
| 555 return expr; | |
| 556 } | |
| 557 | |
| 558 ex = call.Object; | |
| 559 | |
| 560 break; | |
| 561 } | |
| 562 } | |
| 563 } | |
| 564 | |
| 565 return expr; | |
| 566 } | |
| 567 | |
| 568 Expression ConvertSingleOrFirst(Expression expr, MethodCallExpression call) | |
| 569 { | |
| 570 var param = Expression.Parameter(call.Type, "p"); | |
| 571 var selector = expr.Convert(e => e == call ? param : e); | |
| 572 var method = GetQueriableMethodInfo(call, (m, _) => m.Name == call.Method.Name && m.GetParameters().Length == 1); | |
| 573 var select = call.Method.DeclaringType == typeof(Enumerable) ? | |
| 574 EnumerableMethods | |
| 575 .Where(m => m.Name == "Select" && m.GetParameters().Length == 2) | |
| 576 .First(m => m.GetParameters()[1].ParameterType.GetGenericArguments().Length == 2) : | |
| 577 QueryableMethods | |
| 578 .Where(m => m.Name == "Select" && m.GetParameters().Length == 2) | |
| 579 .First(m => m.GetParameters()[1].ParameterType.GetGenericArguments()[0].GetGenericArguments().Length == 2); | |
| 580 | |
| 581 call = (MethodCallExpression)OptimizeExpression(call); | |
| 582 select = select.MakeGenericMethod(call.Type, expr.Type); | |
| 583 method = method.MakeGenericMethod(expr.Type); | |
| 584 | |
| 585 return Expression.Call(null, method, | |
| 586 Expression.Call(null, select, | |
| 587 call.Arguments[0], | |
| 588 Expression.Lambda(selector, param))); | |
| 589 } | |
| 590 | |
| 591 #endregion | |
| 592 | |
| 593 #region ConvertWhere | |
| 594 | |
| 595 Expression ConvertWhere(MethodCallExpression method) | |
| 596 { | |
| 597 var sequence = OptimizeExpression(method.Arguments[0]); | |
| 598 var predicate = OptimizeExpression(method.Arguments[1]); | |
| 599 var lambda = (LambdaExpression)predicate.Unwrap(); | |
| 600 var lparam = lambda.Parameters[0]; | |
| 601 var lbody = lambda.Body; | |
| 602 | |
| 603 if (lambda.Parameters.Count > 1) | |
| 604 return method; | |
| 605 | |
| 606 var exprs = new List<Expression>(); | |
| 607 | |
| 608 lbody.Visit(ex => | |
| 609 { | |
| 610 if (ex.NodeType == ExpressionType.Call) | |
| 611 { | |
| 612 var call = (MethodCallExpression)ex; | |
| 613 | |
| 614 if (call.Arguments.Count > 0) | |
| 615 { | |
| 616 var arg = call.Arguments[0]; | |
| 617 | |
| 618 if (call.IsQueryable(AggregationBuilder.MethodNames)) | |
| 619 { | |
| 620 while (arg.NodeType == ExpressionType.Call && ((MethodCallExpression) arg).Method.Name == "Select") | |
| 621 arg = ((MethodCallExpression) arg).Arguments[0]; | |
| 622 | |
| 623 if (arg.NodeType == ExpressionType.Call) | |
| 624 exprs.Add(ex); | |
| 625 } | |
| 626 else if (call.IsQueryable(CountBuilder.MethodNames)) | |
| 627 { | |
| 628 //while (arg.NodeType == ExpressionType.Call && ((MethodCallExpression) arg).Method.Name == "Select") | |
| 629 // arg = ((MethodCallExpression) arg).Arguments[0]; | |
| 630 | |
| 631 if (arg.NodeType == ExpressionType.Call) | |
| 632 exprs.Add(ex); | |
| 633 } | |
| 634 } | |
| 635 } | |
| 636 }); | |
| 637 | |
| 638 Expression expr = null; | |
| 639 | |
| 640 if (exprs.Count > 0) | |
| 641 { | |
| 642 expr = lparam; | |
| 643 | |
| 644 foreach (var ex in exprs) | |
| 645 { | |
| 646 var type = typeof(ExpressionHoder<,>).MakeGenericType(expr.Type, ex.Type); | |
| 647 var fields = type.GetFields(); | |
| 648 | |
| 649 expr = Expression.MemberInit( | |
| 650 Expression.New(type), | |
| 651 Expression.Bind(fields[0], expr), | |
| 652 Expression.Bind(fields[1], ex)); | |
| 653 } | |
| 654 | |
| 655 var dic = new Dictionary<Expression, Expression>(); | |
| 656 var parm = Expression.Parameter(expr.Type, lparam.Name); | |
| 657 | |
| 658 for (var i = 0; i < exprs.Count; i++) | |
| 659 { | |
| 660 Expression ex = parm; | |
| 661 | |
| 662 for (var j = i; j < exprs.Count - 1; j++) | |
| 663 ex = Expression.PropertyOrField(ex, "p"); | |
| 664 | |
| 665 ex = Expression.PropertyOrField(ex, "ex"); | |
| 666 | |
| 667 dic.Add(exprs[i], ex); | |
| 668 | |
| 669 if (_subQueryExpressions == null) | |
| 670 _subQueryExpressions = new HashSet<Expression>(); | |
| 671 _subQueryExpressions.Add(ex); | |
| 672 } | |
| 673 | |
| 674 var newBody = lbody.Convert(ex => | |
| 675 { | |
| 676 Expression e; | |
| 677 return dic.TryGetValue(ex, out e) ? e : ex; | |
| 678 }); | |
| 679 | |
| 680 var nparm = exprs.Aggregate<Expression,Expression>(parm, (c,t) => Expression.PropertyOrField(c, "p")); | |
| 681 | |
| 682 newBody = newBody.Convert(ex => ex == lparam ? nparm : ex); | |
| 683 | |
| 684 predicate = Expression.Lambda(newBody, parm); | |
| 685 | |
| 686 var methodInfo = GetMethodInfo(method, "Select"); | |
| 687 | |
| 688 methodInfo = methodInfo.MakeGenericMethod(lparam.Type, expr.Type); | |
| 689 sequence = Expression.Call(methodInfo, sequence, Expression.Lambda(expr, lparam)); | |
| 690 } | |
| 691 | |
| 692 if (sequence != method.Arguments[0] || predicate != method.Arguments[1]) | |
| 693 { | |
| 694 var methodInfo = method.Method.GetGenericMethodDefinition(); | |
|
6
11b6da379593
Исправлена странная ошибка при использовании OfType<...>().Where(...)
cin
parents:
5
diff
changeset
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695 var queryableType = sequence.Type.GetInterface(typeof(IEnumerable<>).Name); |
|
5
f7d63a092920
Исправлено условие Where в тех случаях, когда репозитарий не является генериком
cin
parents:
0
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changeset
|
696 var genericType = queryableType.GetGenericArguments()[0]; |
| 0 | 697 var newMethod = methodInfo.MakeGenericMethod(genericType); |
| 698 | |
| 699 method = Expression.Call(newMethod, sequence, predicate); | |
| 700 | |
| 701 if (exprs.Count > 0) | |
| 702 { | |
| 703 var parameter = Expression.Parameter(expr.Type, lparam.Name); | |
| 704 | |
| 705 methodInfo = GetMethodInfo(method, "Select"); | |
| 706 methodInfo = methodInfo.MakeGenericMethod(expr.Type, lparam.Type); | |
| 707 method = Expression.Call(methodInfo, method, | |
| 708 Expression.Lambda( | |
| 709 exprs.Aggregate((Expression)parameter, (current,_) => Expression.PropertyOrField(current, "p")), | |
| 710 parameter)); | |
| 711 } | |
| 712 } | |
| 713 | |
| 714 return method; | |
| 715 } | |
| 716 | |
| 717 #endregion | |
| 718 | |
| 719 #region ConvertGroupBy | |
| 720 | |
| 721 public class GroupSubQuery<TKey,TElement> | |
| 722 { | |
| 723 public TKey Key; | |
| 724 public TElement Element; | |
| 725 } | |
| 726 | |
| 727 interface IGroupByHelper | |
| 728 { | |
| 729 void Set(bool wrapInSubQuery, Expression sourceExpression, LambdaExpression keySelector, LambdaExpression elementSelector, LambdaExpression resultSelector); | |
| 730 | |
| 731 Expression AddElementSelectorQ (); | |
| 732 Expression AddElementSelectorE (); | |
| 733 Expression AddResultQ (); | |
| 734 Expression AddResultE (); | |
| 735 Expression WrapInSubQueryQ (); | |
| 736 Expression WrapInSubQueryE (); | |
| 737 Expression WrapInSubQueryResultQ(); | |
| 738 Expression WrapInSubQueryResultE(); | |
| 739 } | |
| 740 | |
| 741 class GroupByHelper<TSource,TKey,TElement,TResult> : IGroupByHelper | |
| 742 { | |
| 743 bool _wrapInSubQuery; | |
| 744 Expression _sourceExpression; | |
| 745 LambdaExpression _keySelector; | |
| 746 LambdaExpression _elementSelector; | |
| 747 LambdaExpression _resultSelector; | |
| 748 | |
| 749 public void Set( | |
| 750 bool wrapInSubQuery, | |
| 751 Expression sourceExpression, | |
| 752 LambdaExpression keySelector, | |
| 753 LambdaExpression elementSelector, | |
| 754 LambdaExpression resultSelector) | |
| 755 { | |
| 756 _wrapInSubQuery = wrapInSubQuery; | |
| 757 _sourceExpression = sourceExpression; | |
| 758 _keySelector = keySelector; | |
| 759 _elementSelector = elementSelector; | |
| 760 _resultSelector = resultSelector; | |
| 761 } | |
| 762 | |
| 763 public Expression AddElementSelectorQ() | |
| 764 { | |
| 765 Expression<Func<IQueryable<TSource>,TKey,TElement,TResult,IQueryable<IGrouping<TKey,TSource>>>> func = (source,key,e,r) => source | |
| 766 .GroupBy(keyParam => key, _ => _) | |
| 767 ; | |
| 768 | |
| 769 var body = func.Body.Unwrap(); | |
| 770 var keyArg = GetLambda(body, 1).Parameters[0]; // .GroupBy(keyParam | |
| 771 | |
| 772 return Convert(func, keyArg, null, null); | |
| 773 } | |
| 774 | |
| 775 public Expression AddElementSelectorE() | |
| 776 { | |
| 777 Expression<Func<IEnumerable<TSource>,TKey,TElement,TResult,IEnumerable<IGrouping<TKey,TSource>>>> func = (source,key,e,r) => source | |
| 778 .GroupBy(keyParam => key, _ => _) | |
| 779 ; | |
| 780 | |
| 781 var body = func.Body.Unwrap(); | |
| 782 var keyArg = GetLambda(body, 1).Parameters[0]; // .GroupBy(keyParam | |
| 783 | |
| 784 return Convert(func, keyArg, null, null); | |
| 785 } | |
| 786 | |
| 787 public Expression AddResultQ() | |
| 788 { | |
| 789 Expression<Func<IQueryable<TSource>,TKey,TElement,TResult,IQueryable<TResult>>> func = (source,key,e,r) => source | |
| 790 .GroupBy(keyParam => key, elemParam => e) | |
| 791 .Select (resParam => r) | |
| 792 ; | |
| 793 | |
| 794 var body = func.Body.Unwrap(); | |
| 795 var keyArg = GetLambda(body, 0, 1).Parameters[0]; // .GroupBy(keyParam | |
| 796 var elemArg = GetLambda(body, 0, 2).Parameters[0]; // .GroupBy(..., elemParam | |
| 797 var resArg = GetLambda(body, 1). Parameters[0]; // .Select (resParam | |
| 798 | |
| 799 return Convert(func, keyArg, elemArg, resArg); | |
| 800 } | |
| 801 | |
| 802 public Expression AddResultE() | |
| 803 { | |
| 804 Expression<Func<IEnumerable<TSource>,TKey,TElement,TResult,IEnumerable<TResult>>> func = (source,key,e,r) => source | |
| 805 .GroupBy(keyParam => key, elemParam => e) | |
| 806 .Select (resParam => r) | |
| 807 ; | |
| 808 | |
| 809 var body = func.Body.Unwrap(); | |
| 810 var keyArg = GetLambda(body, 0, 1).Parameters[0]; // .GroupBy(keyParam | |
| 811 var elemArg = GetLambda(body, 0, 2).Parameters[0]; // .GroupBy(..., elemParam | |
| 812 var resArg = GetLambda(body, 1). Parameters[0]; // .Select (resParam | |
| 813 | |
| 814 return Convert(func, keyArg, elemArg, resArg); | |
| 815 } | |
| 816 | |
| 817 public Expression WrapInSubQueryQ() | |
| 818 { | |
| 819 Expression<Func<IQueryable<TSource>,TKey,TElement,TResult,IQueryable<IGrouping<TKey,TElement>>>> func = (source,key,e,r) => source | |
| 820 .Select(selectParam => new GroupSubQuery<TKey,TSource> | |
| 821 { | |
| 822 Key = key, | |
| 823 Element = selectParam | |
| 824 }) | |
| 825 .GroupBy(_ => _.Key, elemParam => e) | |
| 826 ; | |
| 827 | |
| 828 var body = func.Body.Unwrap(); | |
| 829 var keyArg = GetLambda(body, 0, 1).Parameters[0]; // .Select (selectParam | |
| 830 var elemArg = GetLambda(body, 2). Parameters[0]; // .GroupBy(..., elemParam | |
| 831 | |
| 832 return Convert(func, keyArg, elemArg, null); | |
| 833 } | |
| 834 | |
| 835 public Expression WrapInSubQueryE() | |
| 836 { | |
| 837 Expression<Func<IEnumerable<TSource>,TKey,TElement,TResult,IEnumerable<IGrouping<TKey,TElement>>>> func = (source,key,e,r) => source | |
| 838 .Select(selectParam => new GroupSubQuery<TKey,TSource> | |
| 839 { | |
| 840 Key = key, | |
| 841 Element = selectParam | |
| 842 }) | |
| 843 .GroupBy(_ => _.Key, elemParam => e) | |
| 844 ; | |
| 845 | |
| 846 var body = func.Body.Unwrap(); | |
| 847 var keyArg = GetLambda(body, 0, 1).Parameters[0]; // .Select (selectParam | |
| 848 var elemArg = GetLambda(body, 2). Parameters[0]; // .GroupBy(..., elemParam | |
| 849 | |
| 850 return Convert(func, keyArg, elemArg, null); | |
| 851 } | |
| 852 | |
| 853 public Expression WrapInSubQueryResultQ() | |
| 854 { | |
| 855 Expression<Func<IQueryable<TSource>,TKey,TElement,TResult,IQueryable<TResult>>> func = (source,key,e,r) => source | |
| 856 .Select(selectParam => new GroupSubQuery<TKey,TSource> | |
| 857 { | |
| 858 Key = key, | |
| 859 Element = selectParam | |
| 860 }) | |
| 861 .GroupBy(_ => _.Key, elemParam => e) | |
| 862 .Select (resParam => r) | |
| 863 ; | |
| 864 | |
| 865 var body = func.Body.Unwrap(); | |
| 866 var keyArg = GetLambda(body, 0, 0, 1).Parameters[0]; // .Select (selectParam | |
| 867 var elemArg = GetLambda(body, 0, 2). Parameters[0]; // .GroupBy(..., elemParam | |
| 868 var resArg = GetLambda(body, 1). Parameters[0]; // .Select (resParam | |
| 869 | |
| 870 return Convert(func, keyArg, elemArg, resArg); | |
| 871 } | |
| 872 | |
| 873 public Expression WrapInSubQueryResultE() | |
| 874 { | |
| 875 Expression<Func<IEnumerable<TSource>,TKey,TElement,TResult,IEnumerable<TResult>>> func = (source,key,e,r) => source | |
| 876 .Select(selectParam => new GroupSubQuery<TKey,TSource> | |
| 877 { | |
| 878 Key = key, | |
| 879 Element = selectParam | |
| 880 }) | |
| 881 .GroupBy(_ => _.Key, elemParam => e) | |
| 882 .Select (resParam => r) | |
| 883 ; | |
| 884 | |
| 885 var body = func.Body.Unwrap(); | |
| 886 var keyArg = GetLambda(body, 0, 0, 1).Parameters[0]; // .Select (selectParam | |
| 887 var elemArg = GetLambda(body, 0, 2). Parameters[0]; // .GroupBy(..., elemParam | |
| 888 var resArg = GetLambda(body, 1). Parameters[0]; // .Select (resParam | |
| 889 | |
| 890 return Convert(func, keyArg, elemArg, resArg); | |
| 891 } | |
| 892 | |
| 893 Expression Convert( | |
| 894 LambdaExpression func, | |
| 895 ParameterExpression keyArg, | |
| 896 ParameterExpression elemArg, | |
| 897 ParameterExpression resArg) | |
| 898 { | |
| 899 var body = func.Body.Unwrap(); | |
| 900 var expr = body.Convert(ex => | |
| 901 { | |
| 902 if (ex == func.Parameters[0]) | |
| 903 return _sourceExpression; | |
| 904 | |
| 905 if (ex == func.Parameters[1]) | |
| 906 return _keySelector.Body.Convert(e => e == _keySelector.Parameters[0] ? keyArg : e); | |
| 907 | |
| 908 if (ex == func.Parameters[2]) | |
| 909 { | |
| 910 Expression obj = elemArg; | |
| 911 | |
| 912 if (_wrapInSubQuery) | |
| 913 obj = Expression.PropertyOrField(elemArg, "Element"); | |
| 914 | |
| 915 if (_elementSelector == null) | |
| 916 return obj; | |
| 917 | |
| 918 return _elementSelector.Body.Convert(e => e == _elementSelector.Parameters[0] ? obj : e); | |
| 919 } | |
| 920 | |
| 921 if (ex == func.Parameters[3]) | |
| 922 return _resultSelector.Body.Convert(e => | |
| 923 { | |
| 924 if (e == _resultSelector.Parameters[0]) | |
| 925 return Expression.PropertyOrField(resArg, "Key"); | |
| 926 | |
| 927 if (e == _resultSelector.Parameters[1]) | |
| 928 return resArg; | |
| 929 | |
| 930 return e; | |
| 931 }); | |
| 932 | |
| 933 return ex; | |
| 934 }); | |
| 935 | |
| 936 return expr; | |
| 937 } | |
| 938 } | |
| 939 | |
| 940 static LambdaExpression GetLambda(Expression expression, params int[] n) | |
| 941 { | |
| 942 foreach (var i in n) | |
| 943 expression = ((MethodCallExpression)expression).Arguments[i].Unwrap(); | |
| 944 return (LambdaExpression)expression; | |
| 945 } | |
| 946 | |
| 947 Expression ConvertGroupBy(MethodCallExpression method) | |
| 948 { | |
| 949 if (method.Arguments[method.Arguments.Count - 1].Unwrap().NodeType != ExpressionType.Lambda) | |
| 950 return method; | |
| 951 | |
| 952 var types = method.Method.GetGenericMethodDefinition().GetGenericArguments() | |
| 953 .Zip(method.Method.GetGenericArguments(), (n, t) => new { n = n.Name, t }) | |
| 954 .ToDictionary(_ => _.n, _ => _.t); | |
| 955 | |
| 956 var sourceExpression = OptimizeExpression(method.Arguments[0].Unwrap()); | |
| 957 var keySelector = (LambdaExpression)OptimizeExpression(method.Arguments[1].Unwrap()); | |
| 958 var elementSelector = types.ContainsKey("TElement") ? (LambdaExpression)OptimizeExpression(method.Arguments[2].Unwrap()) : null; | |
| 959 var resultSelector = types.ContainsKey("TResult") ? | |
| 960 (LambdaExpression)OptimizeExpression(method.Arguments[types.ContainsKey("TElement") ? 3 : 2].Unwrap()) : null; | |
| 961 | |
| 962 var needSubQuery = null != ConvertExpression(keySelector.Body.Unwrap()).Find(IsExpression); | |
| 963 | |
| 964 if (!needSubQuery && resultSelector == null && elementSelector != null) | |
| 965 return method; | |
| 966 | |
| 967 var gtype = typeof(GroupByHelper<,,,>).MakeGenericType( | |
| 968 types["TSource"], | |
| 969 types["TKey"], | |
| 970 types.ContainsKey("TElement") ? types["TElement"] : types["TSource"], | |
| 971 types.ContainsKey("TResult") ? types["TResult"] : types["TSource"]); | |
| 972 | |
| 973 var helper = | |
| 974 //Expression.Lambda<Func<IGroupByHelper>>( | |
| 975 // Expression.Convert(Expression.New(gtype), typeof(IGroupByHelper))) | |
| 976 //.Compile()(); | |
| 977 (IGroupByHelper)Activator.CreateInstance(gtype); | |
| 978 | |
| 979 helper.Set(needSubQuery, sourceExpression, keySelector, elementSelector, resultSelector); | |
| 980 | |
| 981 if (method.Method.DeclaringType == typeof(Queryable)) | |
| 982 { | |
| 983 if (!needSubQuery) | |
| 984 return resultSelector == null ? helper.AddElementSelectorQ() : helper.AddResultQ(); | |
| 985 | |
| 986 return resultSelector == null ? helper.WrapInSubQueryQ() : helper.WrapInSubQueryResultQ(); | |
| 987 } | |
| 988 else | |
| 989 { | |
| 990 if (!needSubQuery) | |
| 991 return resultSelector == null ? helper.AddElementSelectorE() : helper.AddResultE(); | |
| 992 | |
| 993 return resultSelector == null ? helper.WrapInSubQueryE() : helper.WrapInSubQueryResultE(); | |
| 994 } | |
| 995 } | |
| 996 | |
| 997 bool IsExpression(Expression ex) | |
| 998 { | |
| 999 switch (ex.NodeType) | |
| 1000 { | |
| 1001 case ExpressionType.Convert : | |
| 1002 case ExpressionType.ConvertChecked : | |
| 1003 case ExpressionType.MemberInit : | |
| 1004 case ExpressionType.New : | |
| 1005 case ExpressionType.NewArrayBounds : | |
| 1006 case ExpressionType.NewArrayInit : | |
| 1007 case ExpressionType.Parameter : return false; | |
| 1008 case ExpressionType.MemberAccess : | |
| 1009 { | |
| 1010 var ma = (MemberExpression)ex; | |
| 1011 var attr = GetFunctionAttribute(ma.Member); | |
| 1012 | |
| 1013 if (attr != null) | |
| 1014 return true; | |
| 1015 | |
| 1016 return false; | |
| 1017 } | |
| 1018 } | |
| 1019 | |
| 1020 return true; | |
| 1021 } | |
| 1022 | |
| 1023 #endregion | |
| 1024 | |
| 1025 #region ConvertSelectMany | |
| 1026 | |
| 1027 interface ISelectManyHelper | |
| 1028 { | |
| 1029 void Set(Expression sourceExpression, LambdaExpression colSelector); | |
| 1030 | |
| 1031 Expression AddElementSelectorQ(); | |
| 1032 Expression AddElementSelectorE(); | |
| 1033 } | |
| 1034 | |
| 1035 class SelectManyHelper<TSource,TCollection> : ISelectManyHelper | |
| 1036 { | |
| 1037 Expression _sourceExpression; | |
| 1038 LambdaExpression _colSelector; | |
| 1039 | |
| 1040 public void Set(Expression sourceExpression, LambdaExpression colSelector) | |
| 1041 { | |
| 1042 _sourceExpression = sourceExpression; | |
| 1043 _colSelector = colSelector; | |
| 1044 } | |
| 1045 | |
| 1046 public Expression AddElementSelectorQ() | |
| 1047 { | |
| 1048 Expression<Func<IQueryable<TSource>,IEnumerable<TCollection>,IQueryable<TCollection>>> func = (source,col) => source | |
| 1049 .SelectMany(colParam => col, (s,c) => c) | |
| 1050 ; | |
| 1051 | |
| 1052 var body = func.Body.Unwrap(); | |
| 1053 var colArg = GetLambda(body, 1).Parameters[0]; // .SelectMany(colParam | |
| 1054 | |
| 1055 return Convert(func, colArg); | |
| 1056 } | |
| 1057 | |
| 1058 public Expression AddElementSelectorE() | |
| 1059 { | |
| 1060 Expression<Func<IEnumerable<TSource>,IEnumerable<TCollection>,IEnumerable<TCollection>>> func = (source,col) => source | |
| 1061 .SelectMany(colParam => col, (s,c) => c) | |
| 1062 ; | |
| 1063 | |
| 1064 var body = func.Body.Unwrap(); | |
| 1065 var colArg = GetLambda(body, 1).Parameters[0]; // .SelectMany(colParam | |
| 1066 | |
| 1067 return Convert(func, colArg); | |
| 1068 } | |
| 1069 | |
| 1070 Expression Convert(LambdaExpression func, ParameterExpression colArg) | |
| 1071 { | |
| 1072 var body = func.Body.Unwrap(); | |
| 1073 var expr = body.Convert(ex => | |
| 1074 { | |
| 1075 if (ex == func.Parameters[0]) | |
| 1076 return _sourceExpression; | |
| 1077 | |
| 1078 if (ex == func.Parameters[1]) | |
| 1079 return _colSelector.Body.Convert(e => e == _colSelector.Parameters[0] ? colArg : e); | |
| 1080 | |
| 1081 return ex; | |
| 1082 }); | |
| 1083 | |
| 1084 return expr; | |
| 1085 } | |
| 1086 } | |
| 1087 | |
| 1088 Expression ConvertSelectMany(MethodCallExpression method) | |
| 1089 { | |
| 1090 if (method.Arguments.Count != 2 || ((LambdaExpression)method.Arguments[1].Unwrap()).Parameters.Count != 1) | |
| 1091 return method; | |
| 1092 | |
| 1093 var types = method.Method.GetGenericMethodDefinition().GetGenericArguments() | |
| 1094 .Zip(method.Method.GetGenericArguments(), (n, t) => new { n = n.Name, t }) | |
| 1095 .ToDictionary(_ => _.n, _ => _.t); | |
| 1096 | |
| 1097 var sourceExpression = OptimizeExpression(method.Arguments[0].Unwrap()); | |
| 1098 var colSelector = (LambdaExpression)OptimizeExpression(method.Arguments[1].Unwrap()); | |
| 1099 | |
| 1100 var gtype = typeof(SelectManyHelper<,>).MakeGenericType(types["TSource"], types["TResult"]); | |
| 1101 var helper = | |
| 1102 //Expression.Lambda<Func<ISelectManyHelper>>( | |
| 1103 // Expression.Convert(Expression.New(gtype), typeof(ISelectManyHelper))) | |
| 1104 //.Compile()(); | |
| 1105 (ISelectManyHelper)Activator.CreateInstance(gtype); | |
| 1106 | |
| 1107 helper.Set(sourceExpression, colSelector); | |
| 1108 | |
| 1109 return method.Method.DeclaringType == typeof(Queryable) ? | |
| 1110 helper.AddElementSelectorQ() : | |
| 1111 helper.AddElementSelectorE(); | |
| 1112 } | |
| 1113 | |
| 1114 #endregion | |
| 1115 | |
| 1116 #region ConvertPredicate | |
| 1117 | |
| 1118 Expression ConvertPredicate(MethodCallExpression method) | |
| 1119 { | |
| 1120 if (method.Arguments.Count != 2) | |
| 1121 return method; | |
| 1122 | |
| 1123 var cm = GetQueriableMethodInfo(method, (m,_) => m.Name == method.Method.Name && m.GetParameters().Length == 1); | |
| 1124 var wm = GetMethodInfo(method, "Where"); | |
| 1125 | |
| 1126 var argType = method.Method.GetGenericArguments()[0]; | |
| 1127 | |
| 1128 wm = wm.MakeGenericMethod(argType); | |
| 1129 cm = cm.MakeGenericMethod(argType); | |
| 1130 | |
| 1131 return Expression.Call(null, cm, | |
| 1132 Expression.Call(null, wm, | |
| 1133 OptimizeExpression(method.Arguments[0]), | |
| 1134 OptimizeExpression(method.Arguments[1]))); | |
| 1135 } | |
| 1136 | |
| 1137 #endregion | |
| 1138 | |
| 1139 #region ConvertSelector | |
| 1140 | |
| 1141 Expression ConvertSelector(MethodCallExpression method, bool isGeneric) | |
| 1142 { | |
| 1143 if (method.Arguments.Count != 2) | |
| 1144 return method; | |
| 1145 | |
| 1146 isGeneric = isGeneric && method.Method.DeclaringType == typeof(Queryable); | |
| 1147 | |
| 1148 var types = GetMethodGenericTypes(method); | |
| 1149 var sm = GetMethodInfo(method, "Select"); | |
| 1150 var cm = GetQueriableMethodInfo(method, (m,isDefault) => | |
| 1151 { | |
| 1152 if (m.Name == method.Method.Name) | |
| 1153 { | |
| 1154 var ps = m.GetParameters(); | |
| 1155 | |
| 1156 if (ps.Length == 1) | |
| 1157 { | |
| 1158 if (isGeneric) | |
| 1159 return true; | |
| 1160 | |
| 1161 var ts = ps[0].ParameterType.GetGenericArguments(); | |
| 1162 return ts[0] == types[1] || isDefault && ts[0].IsGenericParameter; | |
| 1163 } | |
| 1164 } | |
| 1165 | |
| 1166 return false; | |
| 1167 }); | |
| 1168 | |
| 1169 var argType = types[0]; | |
| 1170 | |
| 1171 sm = sm.MakeGenericMethod(argType, types[1]); | |
| 1172 | |
| 1173 if (cm.IsGenericMethodDefinition) | |
| 1174 cm = cm.MakeGenericMethod(types[1]); | |
| 1175 | |
| 1176 return Expression.Call(null, cm, | |
| 1177 OptimizeExpression(Expression.Call(null, sm, | |
| 1178 method.Arguments[0], | |
| 1179 method.Arguments[1]))); | |
| 1180 } | |
| 1181 | |
| 1182 #endregion | |
| 1183 | |
| 1184 #region ConvertSelect | |
| 1185 | |
| 1186 Expression ConvertSelect(MethodCallExpression method) | |
| 1187 { | |
| 1188 var sequence = OptimizeExpression(method.Arguments[0]); | |
| 1189 var lambda1 = (LambdaExpression)method.Arguments[1].Unwrap(); | |
| 1190 var lambda = (LambdaExpression)OptimizeExpression(lambda1); | |
| 1191 | |
| 1192 if (lambda1.Parameters.Count > 1 || | |
| 1193 sequence.NodeType != ExpressionType.Call || | |
| 1194 ((MethodCallExpression)sequence).Method.Name != method.Method.Name) | |
| 1195 { | |
| 1196 return method; | |
| 1197 } | |
| 1198 | |
| 1199 var slambda = (LambdaExpression)((MethodCallExpression)sequence).Arguments[1].Unwrap(); | |
| 1200 var sbody = slambda.Body.Unwrap(); | |
| 1201 | |
| 1202 if (slambda.Parameters.Count > 1 || sbody.NodeType != ExpressionType.MemberAccess) | |
| 1203 return method; | |
| 1204 | |
| 1205 var types1 = GetMethodGenericTypes((MethodCallExpression)sequence); | |
| 1206 var types2 = GetMethodGenericTypes(method); | |
| 1207 | |
| 1208 var expr = Expression.Call(null, | |
| 1209 GetMethodInfo(method, "Select").MakeGenericMethod(types1[0], types2[1]), | |
| 1210 ((MethodCallExpression)sequence).Arguments[0], | |
| 1211 Expression.Lambda( | |
| 1212 lambda.Body.Convert(ex => ex == lambda.Parameters[0] ? sbody : ex), | |
| 1213 slambda.Parameters[0])); | |
| 1214 | |
| 1215 return expr; | |
| 1216 } | |
| 1217 | |
| 1218 #endregion | |
| 1219 | |
| 1220 #region ConvertIQueriable | |
| 1221 | |
| 1222 Expression ConvertIQueriable(Expression expression) | |
| 1223 { | |
| 1224 if (expression.NodeType == ExpressionType.MemberAccess || expression.NodeType == ExpressionType.Call) | |
| 1225 { | |
| 1226 var p = Expression.Parameter(typeof(Expression), "exp"); | |
| 1227 var exas = expression.GetExpressionAccessors(p); | |
| 1228 var expr = ReplaceParameter(exas, expression, _ => {}); | |
| 1229 | |
| 1230 if (expr.Find(e => e.NodeType == ExpressionType.Parameter && e != p) != null) | |
| 1231 return expression; | |
| 1232 | |
| 1233 var l = Expression.Lambda<Func<Expression,IQueryable>>(Expression.Convert(expr, typeof(IQueryable)), new [] { p }); | |
| 1234 var n = _query.AddQueryableAccessors(expression, l); | |
| 1235 | |
| 1236 Expression accessor; | |
| 1237 | |
| 1238 _expressionAccessors.TryGetValue(expression, out accessor); | |
| 1239 | |
| 1240 var path = | |
| 1241 Expression.Call( | |
| 1242 Expression.Constant(_query), | |
| 1243 ReflectionHelper.Expressor<Query>.MethodExpressor(a => a.GetIQueryable(0, null)), | |
| 1244 new[] { Expression.Constant(n), accessor ?? Expression.Constant(null, typeof(Expression)) }); | |
| 1245 | |
| 1246 var qex = _query.GetIQueryable(n, expression); | |
| 1247 | |
| 1248 if (expression.NodeType == ExpressionType.Call && qex.NodeType == ExpressionType.Call) | |
| 1249 { | |
| 1250 var m1 = (MethodCallExpression)expression; | |
| 1251 var m2 = (MethodCallExpression)qex; | |
| 1252 | |
| 1253 if (m1.Method == m2.Method) | |
| 1254 return expression; | |
| 1255 } | |
| 1256 | |
| 1257 foreach (var a in qex.GetExpressionAccessors(path)) | |
| 1258 if (!_expressionAccessors.ContainsKey(a.Key)) | |
| 1259 _expressionAccessors.Add(a.Key, a.Value); | |
| 1260 | |
| 1261 return qex; | |
| 1262 } | |
| 1263 | |
| 1264 throw new InvalidOperationException(); | |
| 1265 } | |
| 1266 | |
| 1267 #endregion | |
| 1268 | |
| 1269 #region ConvertElementAt | |
| 1270 | |
| 1271 Expression ConvertElementAt(MethodCallExpression method) | |
| 1272 { | |
| 1273 var sequence = OptimizeExpression(method.Arguments[0]); | |
| 1274 var index = OptimizeExpression(method.Arguments[1]).Unwrap(); | |
| 1275 var sourceType = method.Method.GetGenericArguments()[0]; | |
| 1276 | |
| 1277 MethodInfo skipMethod; | |
| 1278 | |
| 1279 if (index.NodeType == ExpressionType.Lambda) | |
| 1280 { | |
| 1281 skipMethod = ReflectionHelper.Expressor<object>.MethodExpressor(o => LinqExtensions.Skip<object>(null, null)); | |
| 1282 skipMethod = skipMethod.GetGenericMethodDefinition(); | |
| 1283 } | |
| 1284 else | |
| 1285 { | |
| 1286 skipMethod = GetQueriableMethodInfo(method, (mi,_) => mi.Name == "Skip"); | |
| 1287 } | |
| 1288 | |
| 1289 skipMethod = skipMethod.MakeGenericMethod(sourceType); | |
| 1290 | |
| 1291 var methodName = method.Method.Name == "ElementAt" ? "First" : "FirstOrDefault"; | |
| 1292 var firstMethod = GetQueriableMethodInfo(method, (mi,_) => mi.Name == methodName && mi.GetParameters().Length == 1); | |
| 1293 | |
| 1294 firstMethod = firstMethod.MakeGenericMethod(sourceType); | |
| 1295 | |
| 1296 return Expression.Call(null, firstMethod, Expression.Call(null, skipMethod, sequence, index)); | |
| 1297 } | |
| 1298 | |
| 1299 #endregion | |
| 1300 | |
| 1301 #region Helpers | |
| 1302 | |
| 1303 MethodInfo GetQueriableMethodInfo(MethodCallExpression method, Func<MethodInfo,bool,bool> predicate) | |
| 1304 { | |
| 1305 return method.Method.DeclaringType == typeof(Enumerable) ? | |
| 1306 EnumerableMethods.FirstOrDefault(m => predicate(m, false)) ?? EnumerableMethods.First(m => predicate(m, true)): | |
| 1307 QueryableMethods. FirstOrDefault(m => predicate(m, false)) ?? QueryableMethods. First(m => predicate(m, true)); | |
| 1308 } | |
| 1309 | |
| 1310 MethodInfo GetMethodInfo(MethodCallExpression method, string name) | |
| 1311 { | |
| 1312 return method.Method.DeclaringType == typeof(Enumerable) ? | |
| 1313 EnumerableMethods | |
| 1314 .Where(m => m.Name == name && m.GetParameters().Length == 2) | |
| 1315 .First(m => m.GetParameters()[1].ParameterType.GetGenericArguments().Length == 2) : | |
| 1316 QueryableMethods | |
| 1317 .Where(m => m.Name == name && m.GetParameters().Length == 2) | |
| 1318 .First(m => m.GetParameters()[1].ParameterType.GetGenericArguments()[0].GetGenericArguments().Length == 2); | |
| 1319 } | |
| 1320 | |
| 1321 static Type[] GetMethodGenericTypes(MethodCallExpression method) | |
| 1322 { | |
| 1323 return method.Method.DeclaringType == typeof(Enumerable) ? | |
| 1324 method.Method.GetParameters()[1].ParameterType.GetGenericArguments() : | |
| 1325 method.Method.GetParameters()[1].ParameterType.GetGenericArguments()[0].GetGenericArguments(); | |
| 1326 } | |
| 1327 | |
| 1328 #endregion | |
| 1329 | |
| 1330 #endregion | |
| 1331 } | |
| 1332 } |