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);
}