internal override Expression VisitMemberAccess(MemberExpression m)
{
Debug.Assert(m != null, "m != null");
if (ClientConvert.IsKnownNullableType(m.Expression.Type))
{
return(base.VisitMemberAccess(m));
}
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()));
}
internal override Expression VisitMemberAccess(MemberExpression m)
{
Debug.Assert(m != null, "m != null");
Expression result;
Expression baseSourceExpression = m.Expression;
if (ClientConvert.IsKnownNullableType(baseSourceExpression.Type))
{
result = base.VisitMemberAccess(m);
}
else
{
Expression baseTargetExpression = this.Visit(baseSourceExpression);
ExpressionAnnotation annotation;
if (this.annotations.TryGetValue(baseTargetExpression, out annotation))
{
result = this.RebindMemberAccess(m, annotation);
}
else
{
result = Expression.MakeMemberAccess(baseTargetExpression, m.Member);
}
}
return(result);
}
#pragma warning restore 649
#endif
#endregion Private fields.
internal MaterializeAtom(DataServiceContext context, XmlReader reader, QueryComponents queryComponents, ProjectionPlan plan, MergeOption mergeOption)
{
Debug.Assert(queryComponents != null, "queryComponents != null");
this.context = context;
this.elementType = queryComponents.LastSegmentType;
this.MergeOptionValue = mergeOption;
this.ignoreMissingProperties = context.IgnoreMissingProperties;
this.reader = (reader == null) ? null : new System.Data.Services.Client.Xml.XmlAtomErrorReader(reader);
this.countValue = CountStateInitial;
this.expectingSingleValue = ClientConvert.IsKnownNullableType(elementType);
Debug.Assert(reader != null, "Materializer reader is null! Did you mean to use Materializer.ResultsWrapper/EmptyResults?");
reader.Settings.NameTable.Add(context.DataNamespace);
string typeScheme = this.context.TypeScheme.OriginalString;
this.parser = new AtomParser(this.reader, AtomParser.XElementBuilderCallback, typeScheme, context.DataNamespace);
AtomMaterializerLog log = new AtomMaterializerLog(this.context, mergeOption);
Type implementationType;
Type materializerType = GetTypeForMaterializer(this.expectingSingleValue, this.elementType, out implementationType);
this.materializer = new AtomMaterializer(parser, context, materializerType, this.ignoreMissingProperties, mergeOption, log, this.MaterializedObjectCallback, queryComponents, plan);
}
/// <summary>
/// CODE: x
/// ORIGINAL: Convert(x, t) where t is assignable from typeof(x)
/// ORIGINAL: x as t, where t is assignable from typeof(x)
/// ORIGINAL: and typeof(x) or t are not known primitives unless typeof(x) == t
/// ORIGINAL: and x is not a collection of entity types
/// NORMALIZED: x
/// </summary>
internal override Expression VisitUnary(UnaryExpression u)
{
UnaryExpression visited = (UnaryExpression)base.VisitUnary(u);
Expression result = visited;
// Note that typically we would record a potential rewrite
// after extracting the conversion, but we avoid doing this
// because it breaks undoing the rewrite by making the non-local
// change circular, ie:
// unary [operand = a]
// becomes
// a <- unary [operand = a]
// So the undoing visits a, then the original unary, then the
// operand and again the unary, the operand, etc.
this.RecordRewrite(u, result);
// Convert(x, t) or x as t, where t is assignable from typeof(x)
if ((visited.NodeType == ExpressionType.Convert || visited.NodeType == ExpressionType.TypeAs) && visited.Type.IsAssignableFrom(visited.Operand.Type))
{
// typeof(x) or t are not known primitives unless typeof(x) == t
if (!ClientConvert.IsKnownNullableType(visited.Operand.Type) && !ClientConvert.IsKnownNullableType(visited.Type) || visited.Operand.Type == visited.Type)
{
// x is not a collection of entity types
if (!(ClientType.CheckElementTypeIsEntity(visited.Operand.Type) && ProjectionAnalyzer.IsCollectionProducingExpression(visited.Operand)))
{
result = visited.Operand;
}
}
}
return(result);
}
#pragma warning restore 649
#endif
#endregion Private fields.
/// <summary>
/// constructor
/// </summary>
/// <param name="context">originating context</param>
/// <param name="reader">reader</param>
/// <param name="queryComponents">Query components (projection, expected type)</param>
/// <param name="plan">Projection plan (if compiled in an earlier query).</param>
/// <param name="mergeOption">merge option to use for this materialization pass</param>
internal MaterializeAtom(DataServiceContext context, XmlReader reader, QueryComponents queryComponents, ProjectionPlan plan, MergeOption mergeOption)
{
Debug.Assert(queryComponents != null, "queryComponents != null");
this.context = context;
this.elementType = queryComponents.LastSegmentType;
this.MergeOptionValue = mergeOption;
this.ignoreMissingProperties = context.IgnoreMissingProperties;
this.reader = (reader == null) ? null : new System.Data.Services.Client.Xml.XmlAtomErrorReader(reader);
this.countValue = CountStateInitial;
this.expectingSingleValue = ClientConvert.IsKnownNullableType(elementType);
Debug.Assert(reader != null, "Materializer reader is null! Did you mean to use Materializer.ResultsWrapper/EmptyResults?");
// NOTE: dataNamespace is used for reference equality, and while it looks like
// a variable, it appears that it will only get set to XmlConstants.DataWebNamespace
// at runtime. Therefore we remove string dataNamespace as a field here.
// this.dataNamespace = reader != null ? reader.Settings.NameTable.Add(context.DataNamespace) : null;
reader.Settings.NameTable.Add(context.DataNamespace);
string typeScheme = this.context.TypeScheme.OriginalString;
this.parser = new AtomParser(this.reader, AtomParser.XElementBuilderCallback, typeScheme, context.DataNamespace);
AtomMaterializerLog log = new AtomMaterializerLog(this.context, mergeOption);
Type implementationType;
Type materializerType = GetTypeForMaterializer(this.expectingSingleValue, this.elementType, out implementationType);
this.materializer = new AtomMaterializer(parser, context, materializerType, this.ignoreMissingProperties, mergeOption, log, this.MaterializedObjectCallback, queryComponents, plan);
}
internal override Expression VisitUnary(UnaryExpression u)
{
UnaryExpression visited = (UnaryExpression)base.VisitUnary(u);
Expression result = visited;
this.RecordRewrite(u, result);
if ((visited.NodeType == ExpressionType.Convert || visited.NodeType == ExpressionType.TypeAs) && visited.Type.IsAssignableFrom(visited.Operand.Type))
{
if (!ClientConvert.IsKnownNullableType(visited.Operand.Type) && !ClientConvert.IsKnownNullableType(visited.Type) || visited.Operand.Type == visited.Type)
{
if (!(ClientType.CheckElementTypeIsEntity(visited.Operand.Type) && ProjectionAnalyzer.IsCollectionProducingExpression(visited.Operand)))
{
result = visited.Operand;
}
}
}
return(result);
}