public static NamedExpression CreateFromMemberName(string memberName, Expression innerExpression) { LinqUtility.CheckNotNull("memberName", memberName); LinqUtility.CheckNotNull("innerExpression", innerExpression); return(new NamedExpression(memberName, innerExpression)); }
public NamedExpression(string name, Expression expression) { LinqUtility.CheckNotNull("expression", expression); Name = name; Expression = expression; }
private void CheckQueryableType(Type queryableType) { LinqUtility.CheckTypeIsAssignableFrom("queryableType", queryableType, typeof(IQueryable)); var queryableTypeInfo = queryableType.GetTypeInfo(); if (!queryableTypeInfo.IsGenericTypeDefinition) { var message = string.Format( "Expected the generic type definition of an implementation of IQueryable<T>, but was '{0}'.", queryableType); throw new ArgumentException(message, "queryableType"); } var genericArgumentCount = queryableTypeInfo.GenericTypeParameters.Length; if (genericArgumentCount != 1) { var message = string.Format( "Expected the generic type definition of an implementation of IQueryable<T> with exactly one type argument, but found {0} arguments on '{1}.", genericArgumentCount, queryableType); throw new ArgumentException(message, "queryableType"); } }
protected override Expression VisitNew(NewExpression expression) { // Select(g=>g) if (expression.Type.Name == "Grouping`2") { var groupByClause = LinqUtility.PriorGroupBy(ModelVisitor)[0]; ModelVisitor.QueryText.AppendFormat(" {0} ", LinqUtility.ResolvePropertyName(groupByClause.TranslateIntoName())); return(expression); } if (!TreatNewWithoutBracket) { ModelVisitor.QueryText.Append(" { "); } var e = (NewExpression)NamedExpression.CreateNewExpressionWithNamedArguments(ModelVisitor.Db, expression); for (var i = 0; i < e.Arguments.Count; i++) { Visit(e.Arguments[i]); if (i != e.Arguments.Count - 1) { ModelVisitor.QueryText.Append(" , "); } } if (!TreatNewWithoutBracket) { ModelVisitor.QueryText.Append(" } "); } return(e); }
/// <summary> /// Initializes a new instance of <see cref="ArangoQueryProvider" /> using a custom <see cref="IQueryParser" />. /// </summary> public ArangoQueryProvider(Type queryableType, IQueryParser queryParser, IQueryExecutor executor, IArangoLinq db) : base(LinqUtility.CheckNotNull("queryParser", queryParser), LinqUtility.CheckNotNull("executor", executor)) { LinqUtility.CheckNotNull("queryableType", queryableType); CheckQueryableType(queryableType); QueryableType = queryableType; this.db = db; }
protected override Expression Accept(ExpressionVisitor visitor) { LinqUtility.CheckNotNull("visitor", visitor); var specificVisitor = visitor as INamedExpressionVisitor; if (specificVisitor != null) { return(specificVisitor.VisitNamed(this)); } return(base.Accept(visitor)); }
protected override Expression VisitChildren(ExpressionVisitor visitor) { LinqUtility.CheckNotNull("visitor", visitor); var newExpression = visitor.Visit(Expression); if (newExpression != Expression) { return(new NamedExpression(Name, newExpression)); } return(this); }
protected override Expression VisitConstant(ConstantExpression expression) { var parentModelVisitor = LinqUtility.FindParentModelVisitor(ModelVisitor); parentModelVisitor.ParameterNameCounter++; var parameterName = "P" + parentModelVisitor.ParameterNameCounter; parentModelVisitor.QueryData.BindVars.Add(parameterName, expression.Value); ModelVisitor.QueryText.AppendFormat(" @{0} ", parameterName); return(expression); }
public QueryData GetQueryData(Expression expression) { LinqUtility.CheckNotNull("expression", expression); var queryModel = GenerateQueryModel(expression); var visitor = new ArangoModelVisitor(db); visitor.VisitQueryModel(queryModel); visitor.QueryData.Query = visitor.QueryText.ToString(); return(visitor.QueryData); }
//public static Expression WrapIntoNamedExpression(string memberName, Expression argumentExpression) //{ // var expressionAsNamedExpression = argumentExpression as NamedExpression; // if (expressionAsNamedExpression != null && expressionAsNamedExpression.Name == memberName) // return expressionAsNamedExpression; // return CreateFromMemberName(memberName, argumentExpression); //} public static Expression WrapIntoNamedExpression(IArangoLinq db, MemberInfo memberInfo, Expression argumentExpression) { var memberName = LinqUtility.ResolveMemberNameRaw(db, memberInfo); var expressionAsNamedExpression = argumentExpression as NamedExpression; if (expressionAsNamedExpression != null && expressionAsNamedExpression.Name == memberName) { return(expressionAsNamedExpression); } var namedExpression = CreateFromMemberName(memberName, argumentExpression); return(namedExpression); }
protected internal override Expression VisitQuerySourceReference(QuerySourceReferenceExpression expression) { ModelVisitor.QueryText.AppendFormat(" {0}", LinqUtility.ResolvePropertyName(expression.ReferencedQuerySource.ItemName)); var mainFromClause = expression.ReferencedQuerySource as MainFromClause; // .Select(g => g.Select(gList => gList.Age)) subquery select, handle prior groupby source parameter names if (mainFromClause != null && mainFromClause.FromExpression.Type.Name == "IGrouping`2") { var groupByClauses = LinqUtility.PriorGroupBy(ModelVisitor); for (var i = 0; i < groupByClauses.Count; i++) { ModelVisitor.QueryText.AppendFormat("{0}{1}{2}" , i == 0 ? "." : "" , LinqUtility.ResolvePropertyName(groupByClauses[i].FromParameterName) , i != groupByClauses.Count - 1 ? "." : ""); } } return(expression); }
protected override Expression VisitParameter(ParameterExpression expression) { var name = expression.Name; if (expression.Type.Name == "TraversalData`2") { var prefix = LinqUtility.MemberNameFromMap(name, "graph", ModelVisitor); ModelVisitor.QueryText.AppendFormat(" {{ {0} : {1}, {2} : {3}, {4} : {5} }} ", LinqUtility.ResolvePropertyName("vertex"), LinqUtility.ResolvePropertyName($"{prefix}_Vertex"), LinqUtility.ResolvePropertyName("edge"), LinqUtility.ResolvePropertyName($"{prefix}_Edge"), LinqUtility.ResolvePropertyName("path"), LinqUtility.ResolvePropertyName($"{prefix}_Path")); return(expression); } if (expression.Type.Name == "ShortestPathData`2") { var prefix = LinqUtility.MemberNameFromMap(name, "graph", ModelVisitor); ModelVisitor.QueryText.AppendFormat(" {{ {0} : {1}, {2} : {3} }} ", LinqUtility.ResolvePropertyName("vertex"), LinqUtility.ResolvePropertyName($"{prefix}_Vertex"), LinqUtility.ResolvePropertyName("edge"), LinqUtility.ResolvePropertyName($"{prefix}_Edge")); return(expression); } ModelVisitor.QueryText.AppendFormat(" {0} ", LinqUtility.ResolvePropertyName(name)); return(expression); }
public static Expression CreateNewExpressionWithNamedArguments(IArangoLinq db, NewExpression expression) { LinqUtility.CheckNotNull("expression", expression); return(CreateNewExpressionWithNamedArguments(db, expression, expression.Arguments)); }
protected override Expression VisitMethodCall(MethodCallExpression expression) { if (expression.Method.Name == "As" && expression.Method.DeclaringType == typeof(Aql)) { Visit(expression.Arguments[0]); return(expression); } if (expression.Method.Name == "get_Item" && expression.Method.DeclaringType.Name == "IList`1") { Visit(expression.Object); ModelVisitor.QueryText.Append(" [ "); Visit(expression.Arguments[0]); ModelVisitor.QueryText.Append(" ] "); return(expression); } string methodName = expression.Method.Name; bool prop = false; if (expression.Method.DeclaringType == typeof(Math)) { if (MathMethods.TryGetValue(expression.Method.Name, out var m)) { methodName = m; } else { throw new InvalidOperationException($"Method {expression.Method.Name} is not supported in ArangoLinqProvider"); } } else { var aqlFunction = expression.Method.GetCustomAttribute <AqlFunctionAttribute>(); if (aqlFunction == null) { throw new InvalidOperationException($"Method {expression.Method.Name} is not supported in ArangoLinqProvider"); } methodName = aqlFunction.Name; prop = aqlFunction.IsProperty; } string argumentSeprator = null; var noParenthesis = MethodsWithNoParenthesis.TryGetValue(methodName, out argumentSeprator) || prop; if (!noParenthesis) { ModelVisitor.QueryText.AppendFormat(" {0}( ", methodName); argumentSeprator = " , "; } Type[] genericArguments = null; if (MethodsWithFirstGenericArgument.Contains(methodName)) { genericArguments = expression.Method.GetGenericArguments(); var collection = LinqUtility.ResolveCollectionName(ModelVisitor.Db, genericArguments[0]); ModelVisitor.QueryText.AppendFormat(" {0}{1}", collection, argumentSeprator); } if (MethodsWithSecondGenericArgument.Contains(methodName)) { var collection = LinqUtility.ResolveCollectionName(ModelVisitor.Db, genericArguments[1]); ModelVisitor.QueryText.AppendFormat(" {0}{1}", collection, argumentSeprator); } for (var i = 0; i < expression.Arguments.Count; i++) { Visit(expression.Arguments[i]); if (i != expression.Arguments.Count - 1) { ModelVisitor.QueryText.Append(argumentSeprator); } } if (!noParenthesis) { ModelVisitor.QueryText.Append(" ) "); } return(expression); }
protected override Expression VisitMember(MemberExpression expression) { var member = expression.Expression as MemberExpression; if (member != null && member.Expression.Type.Name == "IGrouping`2") { ModelVisitor.QueryText.AppendFormat(" {0} ", LinqUtility.ResolvePropertyName(expression.Member.Name)); } // Select(g=>g.Key) else if (expression.Expression.Type.Name == "IGrouping`2") { var groupByClause = LinqUtility.PriorGroupBy(ModelVisitor)[0]; var newExpression = groupByClause.Selector as NewExpression; if (newExpression != null) { ModelVisitor.QueryText.Append(" { "); for (var i = 0; i < newExpression.Members.Count; i++) { var memberName = newExpression.Members[i].Name; ModelVisitor.QueryText.AppendFormat(" {0} : {1} ", LinqUtility.ResolvePropertyName(memberName), LinqUtility.ResolvePropertyName(memberName)); if (i != newExpression.Members.Count - 1) { ModelVisitor.QueryText.Append(" , "); } } ModelVisitor.QueryText.Append(" } "); } if (groupByClause.Selector.NodeType != ExpressionType.New) { ModelVisitor.QueryText.AppendFormat(" {0} ", LinqUtility.ResolvePropertyName(groupByClause.CollectVariableName)); } } else if (expression.Expression.Type.Name == "TraversalData`2" || expression.Expression.Type.Name == "ShortestPathData`2") { var parameterExpression = expression.Expression as ParameterExpression; if (parameterExpression == null) { throw new InvalidOperationException( "[TraversalData`2|ShortestPathData`2] VisitMember, expected a ParameterExpression"); } var prefix = LinqUtility.MemberNameFromMap(parameterExpression.Name, "graph", ModelVisitor); ModelVisitor.QueryText.AppendFormat( LinqUtility.ResolvePropertyName($"{prefix}_{expression.Member.Name}")); } else { Visit(expression.Expression); ModelVisitor.QueryText.AppendFormat(".{0} ", LinqUtility.ResolveMemberName(ModelVisitor.Db, expression.Member)); } return(expression); }