/// <summary>
/// 获取成员名称
/// </summary>
private static string GetMemberName(MemberExpression memberExpression)
{
if (memberExpression == null)
return string.Empty;
string result = memberExpression.ToString();
return result.Substring(result.IndexOf(".") + 1);
}
protected override Expression VisitMemberAccess(MemberExpression m)
{
var result = m.ToString();
return Expression.Constant(result.Substring(result.IndexOf('.') + 1));
}
internal override Expression VisitMemberAccess(MemberExpression m)
{
PropertyInfo info;
Expression expression;
Type type = m.Expression.Type;
this.leafExpressionIsMemberAccess = true;
if (PrimitiveType.IsKnownNullableType(type))
{
this.leafExpressionIsMemberAccess = false;
return base.VisitMemberAccess(m);
}
if (ProjectionAnalyzer.IsCollectionProducingExpression(m.Expression))
{
throw new NotSupportedException(System.Data.Services.Client.Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
if (!ResourceBinder.PatternRules.MatchNonPrivateReadableProperty(m, out info, out expression))
{
throw new NotSupportedException(System.Data.Services.Client.Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
Expression expression2 = base.VisitMemberAccess(m);
if (ClientTypeUtil.TypeOrElementTypeIsEntity(type))
{
Type type2;
ResourceBinder.StripTo<Expression>(m.Expression, out type2);
this.box.AppendPropertyToPath(info, type2, this.context);
this.leafExpressionIsMemberAccess = false;
}
return expression2;
}
/// <summary>
/// Visits member access.
/// </summary>
/// <param name="m">The expression.</param>
/// <returns></returns>
/// <exception cref="NotSupportedException">
/// </exception>
protected override Expression VisitMemberAccess(MemberExpression m)
{
//if(m.Expression.NodeType == ExpressionType.MemberAccess)
//{
// VisitMemberAccess((MemberExpression)m.Expression);
//}
if (m.Expression != null && m.Expression.NodeType == ExpressionType.Parameter)
{
var alias = MongoConfiguration.GetPropertyAlias(m.Expression.Type, m.Member.Name);
var id = TypeHelper.GetHelperForType(m.Expression.Type).FindIdProperty();
if (id != null && id.Name == alias)
{
alias = "_id";
}
if (UseScopedQualifier)
{
_sb.Append("this.");
}
_sb.Append(alias);
_lastFlyProperty = alias;
return m;
}
if (m.Member.DeclaringType == typeof(string))
{
switch (m.Member.Name)
{
case "Length":
_sb.Append("LEN(");
Visit(m.Expression);
_sb.Append(")");
return m;
}
}
else if (m.Member.DeclaringType == typeof(DateTime) || m.Member.DeclaringType == typeof(DateTimeOffset))
{
#region DateTime Magic
var fullName = m.ToString().Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
// this is complex
IsComplex = true;
// this is a DateProperty hanging off the property - clip the last 2 elements
var fixedName = fullName.Skip(1).Take(fullName.Length - 2).ToArray();
var propName = string.Join(".", fixedName);
// now we get to do some tricky fun with javascript
switch (m.Member.Name)
{
case "Day":
Visit(m.Expression);
_sb.Append(".getDate()");
return m;
case "Month":
Visit(m.Expression);
_sb.Append(".getMonth()");
return m;
case "Year":
Visit(m.Expression);
_sb.Append(".getFullYear()");
return m;
case "Hour":
Visit(m.Expression);
_sb.Append(".getHours()");
return m;
case "Minute":
Visit(m.Expression);
_sb.Append(".getMinutes()");
return m;
case "Second":
Visit(m.Expression);
_sb.Append(".getSeconds()");
return m;
case "DayOfWeek":
Visit(m.Expression);
_sb.Append(".getDay()");
return m;
}
#endregion
}
else
{
var fullName = m.ToString().Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
// this supports the "deep graph" name - "Product.Address.City"
var fixedName = fullName.Skip(1).Take(fullName.Length - 1).ToArray();
String result = "";
if (m.Expression.NodeType == ExpressionType.Constant)
{
var constant = m.Expression as ConstantExpression;
var fi = (FieldInfo)m.Member;
var val = fi.GetValue(constant.Value);
if (val is String)
{
result = String.Format("\"{0}\"", val);
}
else
{
result = val.ToString();
}
SetFlyValue(val);
}
else
{
var expressionRootType = GetParameterExpression((MemberExpression)m.Expression);
if (expressionRootType != null)
{
fixedName = GetDeepAlias(expressionRootType.Type, fixedName);
}
result = string.Join(".", fixedName);
//sb.Append("this." + result);
if (UseScopedQualifier)
{
_sb.Append("this.");
}
}
_sb.Append(result);
_lastFlyProperty = result;
return m;
}
// if this is a property NOT on the object...
throw new NotSupportedException(string.Format("The member '{0}' is not supported", m.Member.Name));
}
private string TranslateOneToMany(string functionName, MemberExpression memberExpression, LambdaExpression fieldExpression, LambdaExpression filterExpression)
{
if (!string.IsNullOrEmpty(TranslateMember(memberExpression))) // this shouldn't return any SQL
throw new SqlExpressionTranslatorException(memberExpression.ToString());
var relation = GetRelation(memberExpression.Expression, memberExpression.Member.Name);
if (relation == null)
throw new SqlExpressionTranslatorException(memberExpression.ToString());
if (fieldExpression != null && filterExpression != null && fieldExpression.Parameters[0] != filterExpression.Parameters[0])
throw new SqlExpressionTranslatorException(null);
var iterator = fieldExpression != null ? fieldExpression.Parameters[0] : filterExpression != null ? filterExpression.Parameters[0] : Expression.Parameter(relation.ElementType);
LambdaExpression relationExpression = CreateToManyFilterExpression(relation, memberExpression.Expression, filterExpression, iterator);
var template = _toManyTemplates[functionName];
if (template == null)
throw new NotSupportedException(functionName);
var alias = SqlNameGenerator.NextTableAlias();
_metaData[iterator] = new ExpressionMetaData { Iterator = iterator, Relation = relation, Schema = relation.ForeignSchema };
_relationAliases[iterator] = new Dictionary<object, string> { { relation, alias } };
_subQueries.Push(new SubQuery());
string sqlFields = Translate(fieldExpression);
string sqlWhere = Translate(relationExpression);
string sqlJoins = (Joins.Count > 0) ? string.Join(" ", Joins.Select(join => join.ToSql(_sqlDialect))) : null;
_subQueries.Pop();
return string.Format(template,
sqlFields,
_sqlDialect.QuoteTable(relation.ForeignSchema.MappedName) + " " + alias, sqlJoins ?? "",
sqlWhere
);
}
private static bool MemberExpressionsEqual(MemberExpression x, MemberExpression y, LambdaExpression rootX, LambdaExpression rootY)
{
// Special case for static field and static property
if (x.Expression == null)
{
return Equals(x.Member, y.Member);
}
if (x.Expression.NodeType != y.Expression.NodeType)
return false;
switch (x.Expression.NodeType)
{
case ExpressionType.Constant:
var constx = GetValueOfConstantExpression(x);
var consty = GetValueOfConstantExpression(y);
return Equals(constx, consty);
case ExpressionType.Parameter:
case ExpressionType.MemberAccess:
return Equals(x.Member, y.Member) && ExpressionEqual(x.Expression, y.Expression, rootX, rootY);
case ExpressionType.New:
case ExpressionType.Call:
return ExpressionEqual(x.Expression, y.Expression, rootX, rootY);
default:
throw new NotImplementedException(x.ToString());
}
}
/// <summary>
/// Visits a member access expression in non-entity projections, validating that
/// it's correct and recording the path visit to include in a projection if necessary.
/// </summary>
/// <param name="m">Expression to visit.</param>
/// <returns>The same expression.</returns>
/// <remarks>
/// The projection analyzer runs after funcletization, so a member expression
/// rather than a constant expression implies that this is correlated to
/// a parameter, by dotting through the argument in valid cases, and possibly
/// more complex cases in others like new DSC(p.Orders)*.Foo* <- .Foo is invalid.
/// </remarks>
internal override Expression VisitMemberAccess(MemberExpression m)
{
Debug.Assert(m != null, "m != null");
// if primitive or nullable primitive, allow member access... i.e. calling Value on nullable<int>
if (ClientConvert.IsKnownNullableType(m.Expression.Type))
{
return base.VisitMemberAccess(m);
}
// Only allowed to project entities
if (!ClientType.CheckElementTypeIsEntity(m.Expression.Type) || IsCollectionProducingExpression(m.Expression))
{
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
PropertyInfo pi = null;
if (ResourceBinder.PatternRules.MatchNonPrivateReadableProperty(m, out pi))
{
Expression e = base.VisitMemberAccess(m);
box.AppendToPath(pi);
return e;
}
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
private BsonValue TranslateMemberAccess(MemberExpression node)
{
BsonValue result;
if (node.Expression.Type == typeof(DateTime)
&& TryTranslateDateTimeMemberAccess(node, out result))
{
return result;
}
if (node.Expression != null
&& (node.Expression.Type.ImplementsInterface(typeof(ICollection<>))
|| node.Expression.Type.ImplementsInterface(typeof(ICollection)))
&& node.Member.Name == "Count")
{
return new BsonDocument("$size", TranslateValue(node.Expression));
}
var message = string.Format("Member {0} of type {1} in the expression tree {2} cannot be translated.",
node.Member.Name,
node.Member.DeclaringType,
node.ToString());
throw new NotSupportedException(message);
}
//
// Listing 12-38 (continue)
//
/// <summary>
/// We support only TotalMinutes and TotalHours comparison
/// </summary>
private void TranslateTimeSpanComparison(
ExpressionType nodeType,
ConstantExpression constant,
MemberExpression memberAccess)
{
MemberExpression parent = memberAccess.Expression as MemberExpression;
if (parent.Member.ReflectedType != typeof(ImageInformation))
{
throw new NotSupportedException(
string.Format(
"Member {0} is not of type Images",
memberAccess.ToString()));
}
// We support only TotalMinutes for this simple provider
if ((memberAccess.Member.Name == "TotalMinutes")
&& (parent.Member.Name == "TimeToArrival"))
{
SetIntParameter(
(int)GetDoubleConstant(constant),
ref queryParameters.Filter.MaxDaysTaken,
ref queryParameters.Filter.MaxDaysTaken,
nodeType);
}
else
{
throw new NotSupportedException(
string.Format(
"Query on {0} expression is not supported",
memberAccess.ToString()));
}
}
/// <summary>
/// The standard case supports an equal condition for strings
/// and other comparisons for GroundSpeed and Altitude integers
/// </summary>
private void TranslateStandardComparisons(
ExpressionType nodeType,
ConstantExpression constant,
MemberExpression memberAccess)
{
string stringFieldName =
(from field in typeof(ImageInformation).GetProperties()
where Type.GetTypeCode(field.PropertyType) == TypeCode.String
&& field.Name == memberAccess.Member.Name
select field.Name).FirstOrDefault();
// Loop for all strings
if (stringFieldName != null)
{
if (nodeType != ExpressionType.Equal)
{
throw new NotSupportedException(
string.Format(
"The binary operator '{0}' is not supported on {1} member",
nodeType,
memberAccess.Member.Name));
}
queryParameters.Filter.GetType()
.GetField(stringFieldName)
.SetValue(queryParameters.Filter, constant.Value);
}
else
{
// String not found
switch (memberAccess.Member.Name)
{
case "DateTaken":
//SetDateTimeParameter(
// constant.Value.ToString(),
// ref queryParameters.Filter.MinDateTaken,
// ref queryParameters.Filter.MaxDateTaken,
// nodeType);
//break;
default:
throw new NotSupportedException(
string.Format("Condition on member {0} is not supported",
memberAccess.ToString()));
}
}
}
/// <summary>
/// Process member references.
/// </summary>
/// <param name="expression">
/// The expression to visit.
/// </param>
/// <returns>
/// The visited expression.
/// </returns>
private Expression VisitMemberAccess(MemberExpression expression)
{
// Lookup the Mobile Services name of the member and use that
string memberName = GetTableMemberName(expression, this.contractResolver);
if (memberName != null)
{
this.filterExpression.Push(new MemberAccessNode(null, memberName));
return expression;
}
// Check if this member is actually a function that looks like a
// property (like string.Length, etc.)
string methodName = null;
MemberInfoKey memberInfoKey = new MemberInfoKey(expression.Member);
if (InstanceProperties.TryGetValue(memberInfoKey, out methodName))
{
var fnCallNode = new FunctionCallNode(methodName, null);
this.filterExpression.Push(fnCallNode);
this.Visit(expression.Expression);
this.SetChildren(fnCallNode);
return expression;
}
// Otherwise we can't process the member.
throw new NotSupportedException(
string.Format(
CultureInfo.InvariantCulture,
"The member '{0}' is not supported in the 'Where' Mobile Services query expression '{1}'.",
expression != null && expression.Member != null ? expression.Member.Name : null,
expression != null ? expression.ToString() : null));
}
private string TranslateMember(MemberExpression node)
{
if (node.Expression.Type == typeof(string) && node.Member.Name == "Length")
{
string fnName = _sqlDialect.SqlFunction(SqlDialect.Function.StringLength, Translate(node.Expression));
if (fnName != null)
return fnName;
}
if (Translate(node.Expression) != null)
throw new SqlExpressionTranslatorException(node.ToString());
string sql = ProcessRelation(node, node.Expression, node.Member.Name);
if (sql != null)
{
if (node.Type == typeof (bool))
{
return TranslateTrue(_sqlDialect.QuoteField(sql));
}
else
return _sqlDialect.QuoteField(sql);
}
return null;
}
/// <summary>
/// Visits member access.
/// </summary>
/// <param name="m">The expression.</param>
/// <returns></returns>
/// <exception cref="NotSupportedException">
/// </exception>
protected override Expression VisitMemberAccess(MemberExpression m)
{
if (m.Expression != null && m.Expression.NodeType == ExpressionType.Parameter)
{
var alias = MongoConfiguration.GetPropertyAlias(m.Expression.Type, m.Member.Name);
var id = TypeHelper.GetHelperForType(m.Expression.Type).FindIdProperty();
if (id != null && id.Name == alias)
{
alias = "_id";
}
if (UseScopedQualifier)
{
_sbWhere.Append("this.");
}
_sbWhere.Append(alias);
_lastFlyProperty = alias;
return m;
}
if (m.Member.DeclaringType == typeof(string))
{
switch (m.Member.Name)
{
case "Length":
IsComplex = true;
Visit(m.Expression);
_sbWhere.Append(".length");
return m;
}
}
else if (m.Member.DeclaringType == typeof(DateTime) || m.Member.DeclaringType == typeof(DateTimeOffset))
{
#region DateTime Magic
// this is complex
IsComplex = true;
// now we get to do some tricky fun with javascript
switch (m.Member.Name)
{
case "Day":
Visit(m.Expression);
_sbWhere.Append(".getDate()");
return m;
case "Month":
Visit(m.Expression);
_sbWhere.Append(".getMonth()");
return m;
case "Year":
Visit(m.Expression);
_sbWhere.Append(".getFullYear()");
return m;
case "Hour":
Visit(m.Expression);
_sbWhere.Append(".getHours()");
return m;
case "Minute":
Visit(m.Expression);
_sbWhere.Append(".getMinutes()");
return m;
case "Second":
Visit(m.Expression);
_sbWhere.Append(".getSeconds()");
return m;
case "DayOfWeek":
Visit(m.Expression);
_sbWhere.Append(".getDay()");
return m;
}
#endregion
}
else
{
// this supports the "deep graph" name - "Product.Address.City"
var fullName = m.ToString().Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
var fixedName = fullName
.Skip(1)
.Where(x => x != "First()")
.Select(x => Regex.Replace(x, @"\[[0-9]+\]$", ""))
.ToArray();
var expressionRootType = GetParameterExpression(m.Expression);
if (expressionRootType != null)
{
fixedName = GetDeepAlias(expressionRootType.Type, fixedName);
}
if (UseScopedQualifier)
{
_sbWhere.Append("this.");
}
string result = string.Join(".", fixedName);
_sbWhere.Append(result);
_lastFlyProperty = result;
return m;
}
// if this is a property NOT on the object...
throw new NotSupportedException(string.Format("The member '{0}' is not supported", m.Member.Name));
}
private string VisitDeepAlias(MemberExpression m)
{
var fullName = m.ToString().Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
var fixedName = fullName
.Skip(1)
.Select(x => Regex.Replace(x, @"^get_Item\(([0-9]+)\)$", "$1|Ind"))
.Select(x => Regex.Replace(x, @"\[([0-9]+)\]$", "$1|Ind"))
.Select(x => x.Replace("First()", "0|Ind"))
.ToArray();
if (!_isDeepGraphWithArrays)
_isDeepGraphWithArrays = fullName.Length - fixedName.Length != 1;
var expressionRootType = GetParameterExpression(m.Expression);
if (expressionRootType != null)
{
fixedName = GetDeepAlias(expressionRootType.Type, fixedName);
}
string result = string.Join(".", fixedName.Select(x => x.Replace("|Ind", "")).ToArray());
return result;
}
internal override Expression VisitMemberAccess(MemberExpression m)
{
Debug.Assert(m != null, "m != null");
if (!ClientType.CheckElementTypeIsEntity(m.Expression.Type) || IsCollectionProducingExpression(m.Expression))
{
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjectionToEntity(this.type, m.ToString()));
}
PropertyInfo pi = null;
if (ResourceBinder.PatternRules.MatchNonPrivateReadableProperty(m, out pi))
{
Expression e = base.VisitMemberAccess(m);
box.AppendToPath(pi);
return e;
}
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjectionToEntity(this.type, m.ToString()));
}
internal override Expression VisitMemberAccess(MemberExpression m)
{
Debug.Assert(m != null, "m != null");
if (ClientConvert.IsKnownNullableType(m.Expression.Type))
{
return base.VisitMemberAccess(m);
}
if (!CommonUtil.IsClientType(m.Expression.Type))
{
throw new NotSupportedException(string.Format(CultureInfo.CurrentCulture, SR.ALinqExpressionNotSupportedInProjection, this.type, m.ToString()));
}
PropertyInfo pi = null;
if (ResourceBinder.PatternRules.MatchNonPrivateReadableProperty(m, out pi))
{
Expression e = base.VisitMemberAccess(m);
this.box.AppendToPath(pi);
return e;
}
throw new NotSupportedException(string.Format(CultureInfo.CurrentCulture, SR.ALinqExpressionNotSupportedInProjection, this.type, m.ToString()));
}
private string MemberExprToSql(MemberExpression memberExpr, bool isCondition)
{
if (groupKeySql != null &&
memberExpr.Member.DeclaringType.IsGenericType &&
memberExpr.Member.Name == "Key" &&
memberExpr.Member.DeclaringType.GetGenericTypeDefinition() == typeof(IGroup<,>))
return groupKeySql;
if (memberExpr.Member.DeclaringType == typeof(TimeSpan))
return TimeStampPropToSql(memberExpr);
var constExpr = memberExpr.Expression as ConstantExpression;
if (constExpr != null)
return ClosureMemberToSql(constExpr.Value, memberExpr.Member);
var target = memberExpr.Expression != null ? ExpressionToSql(memberExpr.Expression, false) : null;
var standard = MemberAccessToSql(memberExpr.Member, target);
if (standard != null)
return standard;
var paramExpr = memberExpr.Expression as ParameterExpression;
if (paramExpr != null)
{
var suffix = isCondition && memberExpr.Type == typeof(bool) ? " = 1" : "";
return string.Format("{0}.[{1}]{2}",
ParamExprToSql(paramExpr),
nameResolver.ResolveColumnName(memberExpr.Member),
suffix);
}
var innerMemberExpr = memberExpr.Expression as MemberExpression;
if (innerMemberExpr != null)
return InnerMemberExprToSql(innerMemberExpr, memberExpr.Member);
throw new NotSupportedException(string.Format("Can not translate expression: {0}.", memberExpr.ToString()));
}
/// <summary>
/// Process member references.
/// </summary>
/// <param name="expression">
/// The expression to visit.
/// </param>
/// <returns>
/// The visited expression.
/// </returns>
private Expression VisitMemberAccess(MemberExpression expression)
{
// Lookup the Mobile Services name of the member and use that
string memberName = GetTableMemberName(expression, this.contractResolver);
if (memberName != null)
{
this.filter.Append(memberName);
return expression;
}
// Check if this member is actually a function that looks like a
// property (like string.Length, etc.)
string methodName = null;
MemberInfoKey memberInfoKey = new MemberInfoKey(expression.Member);
if (InstanceProperties.TryGetValue(memberInfoKey, out methodName))
{
this.filter.Append(methodName);
this.filter.Append("(");
this.Visit(expression.Expression);
this.filter.Append(")");
return expression;
}
// Otherwise we can't process the member.
throw new NotSupportedException(
string.Format(
CultureInfo.InvariantCulture,
Resources.FilterBuildingExpressionVisitor_MemberUnsupported,
expression != null && expression.Member != null ? expression.Member.Name : null,
expression != null ? expression.ToString() : null));
}
private string GetCode(MemberExpression memberExpression)
{
return memberExpression.ToString();
}
/// <summary>
/// Visits member access.
/// </summary>
/// <param name="m">The expression.</param>
/// <returns></returns>
/// <exception cref="NotSupportedException">
/// </exception>
protected override Expression VisitMemberAccess(MemberExpression m)
{
var fullName = m.ToString().Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
if (m.Expression != null && m.Expression.NodeType == ExpressionType.Parameter)
{
var alias = MongoConfiguration.GetPropertyAlias(m.Expression.Type, m.Member.Name);
sb.Append("this." + alias); // m.Member.Name);
lastFlyProperty = alias; // m.Member.Name;
return m;
}
if (m.Member.DeclaringType == typeof(string))
{
switch (m.Member.Name)
{
case "Length":
sb.Append("LEN(");
Visit(m.Expression);
sb.Append(")");
return m;
}
}
else if (m.Member.DeclaringType == typeof(DateTime) || m.Member.DeclaringType == typeof(DateTimeOffset))
{
// this is complex
IsComplex = true;
// this is a DateProperty hanging off the property - clip the last 2 elements
var fixedName = fullName.Skip(1).Take(fullName.Length - 2).ToArray();
var propName = string.Join(".", fixedName);
// now we get to do some tricky fun with javascript
switch (m.Member.Name)
{
case "Day":
Visit(m.Expression);
sb.Append(".getDate()");
return m;
case "Month":
Visit(m.Expression);
sb.Append(".getMonth()");
return m;
case "Year":
Visit(m.Expression);
sb.Append(".getFullYear()");
return m;
case "Hour":
Visit(m.Expression);
sb.Append(".getHours()");
return m;
case "Minute":
Visit(m.Expression);
sb.Append(".getMinutes()");
return m;
case "Second":
Visit(m.Expression);
sb.Append(".getSeconds()");
return m;
case "DayOfWeek":
Visit(m.Expression);
sb.Append(".getDay()");
return m;
}
}
else
{
// this supports the "deep graph" name - "Product.Address.City"
var fixedName = fullName.Skip(1).Take(fullName.Length - 1).ToArray();
var expressionRootType = GetParameterExpression((MemberExpression)m.Expression);
if (expressionRootType != null)
{
fixedName = GetDeepAlias(expressionRootType.Type, fixedName);
}
var result = string.Join(".", fixedName);
sb.Append("this." + result);
lastFlyProperty = result;
return m;
}
// if this is a property NOT on the object...
throw new NotSupportedException(string.Format("The member '{0}' is not supported", m.Member.Name));
}
internal override Expression VisitMemberAccess(MemberExpression m)
{
Debug.Assert(m != null, "m != null");
this.leafExpressionIsMemberAccess = true;
// Only allowed to project entities
if (!ClientTypeUtil.TypeOrElementTypeIsEntity(m.Expression.Type) ||
IsCollectionProducingExpression(m.Expression))
{
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjectionToEntity(this.type, m.ToString()));
}
PropertyInfo pi;
Expression boundTarget;
if (ResourceBinder.PatternRules.MatchNonPrivateReadableProperty(m, out pi, out boundTarget))
{
Expression e = base.VisitMemberAccess(m);
Type convertedType;
ResourceBinder.StripTo<Expression>(m.Expression, out convertedType);
this.builder.AppendPropertyToPath(pi, convertedType, this.context);
this.leafExpressionIsMemberAccess = false;
return e;
}
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjectionToEntity(this.type, m.ToString()));
}
private string TranslateMember(MemberExpression node)
{
if (node.Expression.Type == typeof(string) && node.Member.Name == "Length")
{
string fnName = _sqlDialect.SqlFunction(SqlDialect.Function.StringLength, Translate(node.Expression));
if (fnName != null)
return fnName;
}
if (Translate(node.Expression) != null)
throw new SqlExpressionTranslatorException(node.ToString());
var memberName = node.Member.Name;
var field = _schema.FieldsByFieldName[memberName];
if (field != null && !String.IsNullOrEmpty(field.MappedName))
{
memberName = field.MappedName;
}
string sql = ProcessRelation(node, node.Expression, memberName);
if (sql != null)
{
if (node.Type == typeof (bool))
{
return TranslateTrue(_sqlDialect.QuoteField(sql));
}
else
return _sqlDialect.QuoteField(sql);
}
return null;
}
/// <summary>
/// Visits a member access expression in non-entity projections, validating that
/// it's correct and recording the path visit to include in a projection if necessary.
/// </summary>
/// <param name="m">Expression to visit.</param>
/// <returns>The same expression.</returns>
/// <remarks>
/// The projection analyzer runs after funcletization, so a member expression
/// rather than a constant expression implies that this is correlated to
/// a parameter, by dotting through the argument in valid cases, and possibly
/// more complex cases in others like new DSC(p.Orders)*.Var1* <- .Var1 is invalid.
/// </remarks>
internal override Expression VisitMemberAccess(MemberExpression m)
{
Debug.Assert(m != null, "m != null");
Type expressionType = m.Expression.Type;
this.leafExpressionIsMemberAccess = true;
// if primitive or nullable primitive, allow member access... i.e. calling Value on nullable<int>
if (PrimitiveType.IsKnownNullableType(expressionType))
{
this.leafExpressionIsMemberAccess = false;
return base.VisitMemberAccess(m);
}
// Only allowed to project entities, also it is ok to do client side projections on complex types.
// Details on the fix for "Inconsistency between Count() method call and Count property projection on clr type collections":
// Relax check to only throw if IsCollectionProducingExpression returns true.
// This enables client side projections (for example "Count") on Clr type collections, like ReadOnlyCollection (which is used in spatial types), ICollection, IList, etc.
// We already allow client side method calls (like Linq extension method "Count()") on clr type collections, so it makes client side projections consistent.
// Note: it will still throw for List<T> (because IsCollectionProducingExpression returns true for List<T>),
// however this is consistent with how we handle MethodCallExpression on clr type collections
// and changing IsCollectionProducingExpression seems risky at this point as it's used in a lot of places.
if (IsCollectionProducingExpression(m.Expression))
{
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
PropertyInfo pi;
Expression boundTarget;
if (ResourceBinder.PatternRules.MatchNonPrivateReadableProperty(m, out pi, out boundTarget))
{
Expression e = base.VisitMemberAccess(m);
if (ClientTypeUtil.TypeOrElementTypeIsEntity(expressionType))
{
Type convertedType;
ResourceBinder.StripTo<Expression>(m.Expression, out convertedType);
this.builder.AppendPropertyToPath(pi, convertedType, this.context);
this.leafExpressionIsMemberAccess = false;
}
return e;
}
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
/// <summary>
/// Process member references.
/// </summary>
/// <param name="expression">The expression to visit.</param>
/// <returns>The visited expression.</returns>
protected override Expression VisitMember(MemberExpression expression)
{
// Lookup the Mobile Services name of the member and use that
SerializableMember member = GetTableMember(expression);
if (member != null)
{
this.filter.Append(member.Name);
this.MarkVisited();
return expression;
}
// Check if this member is actually a function that looks like a
// property (like string.Length, etc.)
string methodName = null;
if (instanceProperties.TryGetValue(expression.Member, out methodName))
{
this.filter.Append(methodName);
this.filter.Append("(");
this.Visit(expression.Expression);
this.filter.Append(")");
this.MarkVisited();
return expression;
}
// Otherwise we can't process the member.
throw new NotSupportedException(
string.Format(
CultureInfo.InvariantCulture,
Resources.FilterBuildingExpressionVisitor_VisitMember_Unsupported,
expression != null && expression.Member != null ? expression.Member.Name : null,
expression != null ? expression.ToString() : null));
}
private string GetMemberNameFromMemberAccess(MemberExpression memberExpression, ParameterExpression[] parameters)
{
if (memberExpression == null)
{
throw new NotSupportedException();
}
var expressionName = memberExpression.ToString();
var subStrings = expressionName.Split('.');
var isDeepParameter = false;
if (subStrings.Length > 0 && parameters != null && parameters.Length > 0)
{
isDeepParameter = parameters[0].ToString() == subStrings[0];
}
if (memberExpression.NodeType == ExpressionType.MemberAccess && isDeepParameter)
{
var name = FindDeepParameter(memberExpression);
if (name.ToLower() == "id")
{
name = "_id";
}
return name;
}
throw new NotSupportedException(string.Format("Cannot OrderBy {0}", memberExpression.NodeType));
}
