/mcs/class/System.Data.Services.Client/Client/System/Data/Services/Client/AtomMaterializer.cs

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//Copyright 2010 Microsoft Corporation

//

//Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. 

//You may obtain a copy of the License at 

//

//http://www.apache.org/licenses/LICENSE-2.0 

//

//Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an 

//"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 

//See the License for the specific language governing permissions and limitations under the License.





namespace System.Data.Services.Client

{

    #region Namespaces.



    using System;

    using System.Collections;

    using System.Collections.Generic;

    using System.Data.Services.Common;

    using System.Diagnostics;

    using System.Linq;

    using System.Linq.Expressions;

    using System.Reflection;

    using System.Xml;

    using System.Xml.Linq;



    #endregion Namespaces.



    internal static class AtomMaterializerInvoker

    {

        internal static IEnumerable<T> EnumerateAsElementType<T>(IEnumerable source)

        {

            return AtomMaterializer.EnumerateAsElementType<T>(source);

        }



        internal static List<TTarget> ListAsElementType<T, TTarget>(object materializer, IEnumerable<T> source) where T : TTarget

        {

            Debug.Assert(materializer.GetType() == typeof(AtomMaterializer), "materializer.GetType() == typeof(AtomMaterializer)");

            return AtomMaterializer.ListAsElementType<T, TTarget>((AtomMaterializer)materializer, source);

        }



        internal static bool ProjectionCheckValueForPathIsNull(

            object entry,

            Type expectedType,

            object path)

        {

            Debug.Assert(entry.GetType() == typeof(AtomEntry), "entry.GetType() == typeof(AtomEntry)");

            Debug.Assert(path.GetType() == typeof(ProjectionPath), "path.GetType() == typeof(ProjectionPath)");

            return AtomMaterializer.ProjectionCheckValueForPathIsNull((AtomEntry)entry, expectedType, (ProjectionPath)path);

        }



        internal static IEnumerable ProjectionSelect(

            object materializer,

            object entry,

            Type expectedType,

            Type resultType,

            object path,

            Func<object, object, Type, object> selector)

        {

            Debug.Assert(materializer.GetType() == typeof(AtomMaterializer), "materializer.GetType() == typeof(AtomMaterializer)");

            Debug.Assert(entry.GetType() == typeof(AtomEntry), "entry.GetType() == typeof(AtomEntry)");

            Debug.Assert(path.GetType() == typeof(ProjectionPath), "path.GetType() == typeof(ProjectionPath)");

            return AtomMaterializer.ProjectionSelect((AtomMaterializer)materializer, (AtomEntry)entry, expectedType, resultType, (ProjectionPath)path, selector);

        }



        internal static AtomEntry ProjectionGetEntry(object entry, string name)

        {

            Debug.Assert(entry.GetType() == typeof(AtomEntry), "entry.GetType() == typeof(AtomEntry)");

            return AtomMaterializer.ProjectionGetEntry((AtomEntry)entry, name);

        }



        internal static object ProjectionInitializeEntity(

            object materializer,

            object entry,

            Type expectedType,

            Type resultType,

            string[] properties,

            Func<object, object, Type, object>[] propertyValues)

        {

            Debug.Assert(materializer.GetType() == typeof(AtomMaterializer), "materializer.GetType() == typeof(AtomMaterializer)");

            Debug.Assert(entry.GetType() == typeof(AtomEntry), "entry.GetType() == typeof(AtomEntry)");

            return AtomMaterializer.ProjectionInitializeEntity((AtomMaterializer)materializer, (AtomEntry)entry, expectedType, resultType, properties, propertyValues);

        }



        internal static object ProjectionValueForPath(object materializer, object entry, Type expectedType, object path)

        {

            Debug.Assert(materializer.GetType() == typeof(AtomMaterializer), "materializer.GetType() == typeof(AtomMaterializer)");

            Debug.Assert(entry.GetType() == typeof(AtomEntry), "entry.GetType() == typeof(AtomEntry)");

            Debug.Assert(path.GetType() == typeof(ProjectionPath), "path.GetType() == typeof(ProjectionPath)");

            return AtomMaterializer.ProjectionValueForPath((AtomMaterializer)materializer, (AtomEntry)entry, expectedType, (ProjectionPath)path);

        }



        internal static object DirectMaterializePlan(object materializer, object entry, Type expectedEntryType)

        {

            Debug.Assert(materializer.GetType() == typeof(AtomMaterializer), "materializer.GetType() == typeof(AtomMaterializer)");

            Debug.Assert(entry.GetType() == typeof(AtomEntry), "entry.GetType() == typeof(AtomEntry)");

            return AtomMaterializer.DirectMaterializePlan((AtomMaterializer)materializer, (AtomEntry)entry, expectedEntryType);

        }



        internal static object ShallowMaterializePlan(object materializer, object entry, Type expectedEntryType)

        {

            Debug.Assert(materializer.GetType() == typeof(AtomMaterializer), "materializer.GetType() == typeof(AtomMaterializer)");

            Debug.Assert(entry.GetType() == typeof(AtomEntry), "entry.GetType() == typeof(AtomEntry)");

            return AtomMaterializer.ShallowMaterializePlan((AtomMaterializer)materializer, (AtomEntry)entry, expectedEntryType);

        }

    }



    [DebuggerDisplay("AtomMaterializer {parser}")]

    internal class AtomMaterializer

    {

        #region Private fields.



        private readonly DataServiceContext context;



        private readonly Type expectedType;





        private readonly AtomMaterializerLog log;



        private readonly ProjectionPlan materializeEntryPlan;



        private readonly Action<object, object> materializedObjectCallback;



        private readonly MergeOption mergeOption;



        private readonly Dictionary<IEnumerable, DataServiceQueryContinuation> nextLinkTable;



        private readonly AtomParser parser;



        private object currentValue;



        private bool ignoreMissingProperties;



        private object targetInstance;



        #endregion Private fields.



        #region Constructors.



        internal AtomMaterializer(

            AtomParser parser, 

            DataServiceContext context, 

            Type expectedType, 

            bool ignoreMissingProperties, 

            MergeOption mergeOption, 

            AtomMaterializerLog log, 

            Action<object, object> materializedObjectCallback,

            QueryComponents queryComponents,

            ProjectionPlan plan)

        {

            Debug.Assert(context != null, "context != null");

            Debug.Assert(parser != null, "parser != null");

            Debug.Assert(log != null, "log != null");



            this.context = context;

            this.parser = parser;

            this.expectedType = expectedType;

            this.ignoreMissingProperties = ignoreMissingProperties;

            this.mergeOption = mergeOption;

            this.log = log;

            this.materializedObjectCallback = materializedObjectCallback;

            this.nextLinkTable = new Dictionary<IEnumerable, DataServiceQueryContinuation>(ReferenceEqualityComparer<IEnumerable>.Instance);

            this.materializeEntryPlan = plan ?? CreatePlan(queryComponents);

        }



        #endregion Constructors.



        #region Internal properties.



        internal DataServiceContext Context

        {

            get { return this.context; }

        }



        internal ProjectionPlan MaterializeEntryPlan

        {

            get { return this.materializeEntryPlan; }

        }



        internal object TargetInstance

        {

            get 

            { 

                return this.targetInstance;

            }



            set

            {

                Debug.Assert(value != null, "value != null -- otherwise we have no instance target.");

                this.targetInstance = value;

            }

        }



        internal AtomFeed CurrentFeed

        {

            get

            {

                return this.parser.CurrentFeed;

            }

        }



        internal AtomEntry CurrentEntry

        {

            get

            {

                return this.parser.CurrentEntry;

            }

        }



        internal object CurrentValue

        {

            get

            {

                return this.currentValue;

            }

        }



        internal AtomMaterializerLog Log

        {

            get { return this.log; }

        }



        internal Dictionary<IEnumerable, DataServiceQueryContinuation> NextLinkTable

        {

            get { return this.nextLinkTable; }

        }



        internal bool IsEndOfStream

        {

            get { return this.parser.DataKind == AtomDataKind.Finished; }

        }



        #endregion Internal properties.



        #region Projection support.



        internal static IEnumerable<T> EnumerateAsElementType<T>(IEnumerable source)

        {

            Debug.Assert(source != null, "source != null");



            IEnumerable<T> typedSource = source as IEnumerable<T>;

            if (typedSource != null)

            {

                return typedSource;

            }

            else

            {

                return EnumerateAsElementTypeInternal<T>(source);

            }

        }



        internal static IEnumerable<T> EnumerateAsElementTypeInternal<T>(IEnumerable source)

        {

            Debug.Assert(source != null, "source != null");



            foreach (object item in source)

            {

                yield return (T)item;

            }

        }



        internal static bool IsDataServiceCollection(Type type)

        {

            while (type != null)

            {

                if (type.IsGenericType && WebUtil.IsDataServiceCollectionType(type.GetGenericTypeDefinition()))

                {

                    return true;

                }



                type = type.BaseType;

            }



            return false;

        }



        internal static List<TTarget> ListAsElementType<T, TTarget>(AtomMaterializer materializer, IEnumerable<T> source) where T : TTarget

        {

            Debug.Assert(materializer != null, "materializer != null");

            Debug.Assert(source != null, "source != null");



            List<TTarget> typedSource = source as List<TTarget>;

            if (typedSource != null)

            {

                return typedSource;

            }



            List<TTarget> list;

            IList sourceList = source as IList;

            if (sourceList != null)

            {

                list = new List<TTarget>(sourceList.Count);

            }

            else

            {

                list = new List<TTarget>();

            }



            foreach (T item in source)

            {

                list.Add((TTarget)item);

            }



            DataServiceQueryContinuation continuation;

            if (materializer.nextLinkTable.TryGetValue(source, out continuation))

            {

                materializer.nextLinkTable[list] = continuation;

            }



            return list;

        }



        internal static bool ProjectionCheckValueForPathIsNull(

            AtomEntry entry,

            Type expectedType,

            ProjectionPath path)

        {

            Debug.Assert(entry != null, "entry != null");

            Debug.Assert(path != null, "path != null");



            if (path.Count == 0 || path.Count == 1 && path[0].Member == null)

            {

                return entry.IsNull;

            }



            bool result = false;

            AtomContentProperty atomProperty = null;

            List<AtomContentProperty> properties = entry.DataValues;

            for (int i = 0; i < path.Count; i++)

            {

                var segment = path[i];

                if (segment.Member == null)

                {

                    continue;

                }



                bool segmentIsLeaf = i == path.Count - 1;

                string propertyName = segment.Member;

                ClientType.ClientProperty property = ClientType.Create(expectedType).GetProperty(propertyName, false);

                atomProperty = GetPropertyOrThrow(properties, propertyName);

                ValidatePropertyMatch(property, atomProperty);

                if (atomProperty.Feed != null)

                {

                    Debug.Assert(segmentIsLeaf, "segmentIsLeaf -- otherwise the path generated traverses a feed, which should be disallowed");

                    result = false;

                }

                else

                {

                    Debug.Assert(

                        atomProperty.Entry != null,

                        "atomProperty.Entry != null -- otherwise a primitive property / complex type is being rewritte with a null check; this is only supported for entities and collection");

                    if (segmentIsLeaf)

                    {

                        result = atomProperty.Entry.IsNull;

                    }



                    properties = atomProperty.Entry.DataValues;

                    entry = atomProperty.Entry;

                }



                expectedType = property.PropertyType;

            }



            return result;

        }



        internal static IEnumerable ProjectionSelect(

            AtomMaterializer materializer,

            AtomEntry entry,

            Type expectedType,

            Type resultType,

            ProjectionPath path,

            Func<object, object, Type, object> selector)

        {

            ClientType entryType = entry.ActualType ?? ClientType.Create(expectedType);

            IEnumerable list = (IEnumerable)Util.ActivatorCreateInstance(typeof(List<>).MakeGenericType(resultType));

            AtomContentProperty atomProperty = null;

            ClientType.ClientProperty property = null;

            for (int i = 0; i < path.Count; i++)

            {

                var segment = path[i];

                if (segment.Member == null)

                {

                    continue;

                }



                string propertyName = segment.Member;

                property = entryType.GetProperty(propertyName, false);

                atomProperty = GetPropertyOrThrow(entry, propertyName);



                if (atomProperty.Entry != null)

                {

                    entry = atomProperty.Entry;

                    entryType = ClientType.Create(property.NullablePropertyType, false);

                } 

            }



            ValidatePropertyMatch(property, atomProperty);

            AtomFeed sourceFeed = atomProperty.Feed;

            Debug.Assert(

                sourceFeed != null, 

                "sourceFeed != null -- otherwise ValidatePropertyMatch should have thrown or property isn't a collection (and should be part of this plan)");



            Action<object, object> addMethod = GetAddToCollectionDelegate(list.GetType());

            foreach (var paramEntry in sourceFeed.Entries)

            {

                object projected = selector(materializer, paramEntry, property.CollectionType );

                addMethod(list, projected);

            }



            ProjectionPlan plan = new ProjectionPlan();

            plan.LastSegmentType = property.CollectionType;

            plan.Plan = selector;

            plan.ProjectedType = resultType;



            materializer.FoundNextLinkForCollection(list, sourceFeed.NextLink, plan);



            return list;

        }

        

                internal static AtomEntry ProjectionGetEntry(AtomEntry entry, string name)

        {

            Debug.Assert(entry != null, "entry != null -- ProjectionGetEntry never returns a null entry, and top-level materialization shouldn't pass one in");



            AtomContentProperty property = GetPropertyOrThrow(entry, name);

            if (property.Entry == null)

            {

                throw new InvalidOperationException(Strings.AtomMaterializer_PropertyNotExpectedEntry(name, entry.Identity));

            }



            CheckEntryToAccessNotNull(property.Entry, name);



            return property.Entry;

        }



        internal static object ProjectionInitializeEntity(

            AtomMaterializer materializer,

            AtomEntry entry,

            Type expectedType,

            Type resultType,

            string[] properties,

            Func<object, object, Type, object>[] propertyValues)

        {

            if (entry == null || entry.IsNull)

            {

                throw new NullReferenceException(Strings.AtomMaterializer_EntryToInitializeIsNull(resultType.FullName));

            }



            object result;

            if (!entry.EntityHasBeenResolved)

            {

                AtomMaterializer.ProjectionEnsureEntryAvailableOfType(materializer, entry, resultType);

            }

            else if (!resultType.IsAssignableFrom(entry.ActualType.ElementType))

            {

                string message = Strings.AtomMaterializer_ProjectEntityTypeMismatch(

                    resultType.FullName,

                    entry.ActualType.ElementType.FullName,

                    entry.Identity);

                throw new InvalidOperationException(message);

            }



            result = entry.ResolvedObject;

            

            for (int i = 0; i < properties.Length; i++)

            {

                var property = entry.ActualType.GetProperty(properties[i], materializer.ignoreMissingProperties);

                object value = propertyValues[i](materializer, entry, expectedType);

                if (entry.ShouldUpdateFromPayload && ClientType.Create(property.NullablePropertyType, false).IsEntityType)

                {

                    materializer.Log.SetLink(entry, property.PropertyName, value);

                }



                bool isEntity = property.CollectionType == null || !ClientType.CheckElementTypeIsEntity(property.CollectionType);

                if (entry.ShouldUpdateFromPayload)

                {

                    if (isEntity)

                    {

                        property.SetValue(result, value, property.PropertyName, false);

                    }

                    else

                    {

                        IEnumerable valueAsEnumerable = (IEnumerable)value;

                        DataServiceQueryContinuation continuation = materializer.nextLinkTable[valueAsEnumerable];

                        Uri nextLinkUri = continuation == null ? null : continuation.NextLinkUri;

                        ProjectionPlan plan = continuation == null ? null : continuation.Plan;

                        materializer.MergeLists(entry, property, valueAsEnumerable, nextLinkUri, plan);

                    }

                }

                else if (!isEntity)

                {

                    materializer.FoundNextLinkForUnmodifiedCollection(property.GetValue(entry.ResolvedObject) as IEnumerable);

                }

            }



            return result;

        }



        internal static object ProjectionValueForPath(AtomMaterializer materializer, AtomEntry entry, Type expectedType, ProjectionPath path)

        {

            Debug.Assert(materializer != null, "materializer != null");

            Debug.Assert(entry != null, "entry != null");

            Debug.Assert(path != null, "path != null");



            if (path.Count == 0 || path.Count == 1 && path[0].Member == null)

            {

                if (!entry.EntityHasBeenResolved)

                {

                    materializer.Materialize(entry, expectedType, false);

                }



                return entry.ResolvedObject;

            }



            object result = null;

            AtomContentProperty atomProperty = null;

            List<AtomContentProperty> properties = entry.DataValues;

            for (int i = 0; i < path.Count; i++)

            {

                var segment = path[i];

                if (segment.Member == null)

                {

                    continue;

                }



                bool segmentIsLeaf = i == path.Count - 1;

                string propertyName = segment.Member;



                if (segmentIsLeaf)

                {

                    CheckEntryToAccessNotNull(entry, propertyName);

                    if (!entry.EntityPropertyMappingsApplied)

                    {

                        ClientType attributeSourceType = MaterializeAtom.GetEntryClientType(entry.TypeName, materializer.context, expectedType, false);

                        ApplyEntityPropertyMappings(entry, attributeSourceType);

                    }

                }



                ClientType.ClientProperty property = ClientType.Create(expectedType).GetProperty(propertyName, false);

                atomProperty = GetPropertyOrThrow(properties, propertyName);



                ValidatePropertyMatch(property, atomProperty);



                AtomFeed feedValue = atomProperty.Feed;

                if (feedValue != null)

                {

                    Debug.Assert(segmentIsLeaf, "segmentIsLeaf -- otherwise the path generated traverses a feed, which should be disallowed");



                    Type collectionType = ClientType.GetImplementationType(segment.ProjectionType, typeof(ICollection<>));

                    if (collectionType == null)

                    {

                        collectionType = ClientType.GetImplementationType(segment.ProjectionType, typeof(IEnumerable<>));

                    }



                    Debug.Assert(

                        collectionType != null, 

                        "collectionType != null -- otherwise the property should never have been recognized as a collection");

                    

                    Type nestedExpectedType = collectionType.GetGenericArguments()[0];

                    Type feedType = segment.ProjectionType;

                    if (feedType.IsInterface || IsDataServiceCollection(feedType))

                    {

                        feedType = typeof(System.Collections.ObjectModel.Collection<>).MakeGenericType(nestedExpectedType);

                    }



                    IEnumerable list = (IEnumerable)Util.ActivatorCreateInstance(feedType);

                    MaterializeToList(materializer, list, nestedExpectedType, feedValue.Entries);



                    if (IsDataServiceCollection(segment.ProjectionType))

                    {

                        Type dataServiceCollectionType = WebUtil.GetDataServiceCollectionOfT(nestedExpectedType);

                        list = (IEnumerable)Util.ActivatorCreateInstance(

                            dataServiceCollectionType,

                            list,                            

                            TrackingMode.None);                    }



                    ProjectionPlan plan = CreatePlanForShallowMaterialization(nestedExpectedType);

                    materializer.FoundNextLinkForCollection(list, feedValue.NextLink, plan);

                    result = list;

                }

                else if (atomProperty.Entry != null)

                {

                    if (segmentIsLeaf && !atomProperty.Entry.EntityHasBeenResolved && !atomProperty.IsNull)

                    {

                        materializer.Materialize(atomProperty.Entry, property.PropertyType, false);

                    }



                    properties = atomProperty.Entry.DataValues;

                    result = atomProperty.Entry.ResolvedObject;

                    entry = atomProperty.Entry;

                }

                else

                {

                    if (atomProperty.Properties != null)

                    {

                        if (atomProperty.MaterializedValue == null && !atomProperty.IsNull)

                        {

                            ClientType complexType = ClientType.Create(property.PropertyType);

                            object complexInstance = Util.ActivatorCreateInstance(property.PropertyType);

                            MaterializeDataValues(complexType, atomProperty.Properties, materializer.ignoreMissingProperties, materializer.context);

                            ApplyDataValues(complexType, atomProperty.Properties, materializer.ignoreMissingProperties, materializer.context, complexInstance);

                            atomProperty.MaterializedValue = complexInstance;

                        }

                    }

                    else

                    {

                        MaterializeDataValue(property.NullablePropertyType, atomProperty, materializer.context);

                    }



                    properties = atomProperty.Properties;

                    result = atomProperty.MaterializedValue;

                }



                expectedType = property.PropertyType;

            }



            return result;

        }



        internal static void ProjectionEnsureEntryAvailableOfType(AtomMaterializer materializer, AtomEntry entry, Type requiredType)

        {

            Debug.Assert(materializer != null, "materializer != null");

            Debug.Assert(entry != null, "entry != null");

            Debug.Assert(

                materializer.targetInstance == null,

                "materializer.targetInstance == null -- projection shouldn't have a target instance set; that's only used for POST replies");



            if (entry.EntityHasBeenResolved)

            {

                if (!requiredType.IsAssignableFrom(entry.ResolvedObject.GetType()))

                {

                    throw new InvalidOperationException(

                        "Expecting type '" + requiredType + "' for '" + entry.Identity + "', but found " +

                        "a previously created instance of type '" + entry.ResolvedObject.GetType());

                }



                return;

            }



            if (entry.Identity == null)

            {

                throw Error.InvalidOperation(Strings.Deserialize_MissingIdElement);

            }



            if (!materializer.TryResolveAsCreated(entry) && 

                !materializer.TryResolveFromContext(entry, requiredType))

            {

                materializer.ResolveByCreatingWithType(entry, requiredType);

            }

            else

            {

                if (!requiredType.IsAssignableFrom(entry.ResolvedObject.GetType()))

                {

                    throw Error.InvalidOperation(Strings.Deserialize_Current(requiredType, entry.ResolvedObject.GetType()));

                }

            }

        }



        internal static object DirectMaterializePlan(AtomMaterializer materializer, AtomEntry entry, Type expectedEntryType)

        {

            materializer.Materialize(entry, expectedEntryType, true);

            return entry.ResolvedObject;

        }



        internal static object ShallowMaterializePlan(AtomMaterializer materializer, AtomEntry entry, Type expectedEntryType)

        {

            materializer.Materialize(entry, expectedEntryType, false);

            return entry.ResolvedObject;

        }



        internal static void ValidatePropertyMatch(ClientType.ClientProperty property, AtomContentProperty atomProperty)

        {

            Debug.Assert(property != null, "property != null");

            Debug.Assert(atomProperty != null, "atomProperty != null");



            if (property.IsKnownType && (atomProperty.Feed != null || atomProperty.Entry != null))

            {

                throw Error.InvalidOperation(Strings.Deserialize_MismatchAtomLinkLocalSimple);

            }



            if (atomProperty.Feed != null && property.CollectionType == null)

            {

                throw Error.InvalidOperation(Strings.Deserialize_MismatchAtomLinkFeedPropertyNotCollection(property.PropertyName));

            }



            if (atomProperty.Entry != null && property.CollectionType != null)

            {

                throw Error.InvalidOperation(Strings.Deserialize_MismatchAtomLinkEntryPropertyIsCollection(property.PropertyName));

            }

        }



        #endregion Projection support.

        

        #region Internal methods.



        internal bool Read()

        {

            this.currentValue = null;



            this.nextLinkTable.Clear();

            while (this.parser.Read())

            {

                Debug.Assert(

                    this.parser.DataKind != AtomDataKind.None,

                    "parser.DataKind != AtomDataKind.None -- otherwise parser.Read() didn't update its state");

                Debug.Assert(

                    this.parser.DataKind != AtomDataKind.Finished,

                    "parser.DataKind != AtomDataKind.Finished -- otherwise parser.Read() shouldn't have returned true");



                switch (this.parser.DataKind)

                {

                    case AtomDataKind.Feed:

                    case AtomDataKind.FeedCount:

                        break;

                    case AtomDataKind.Entry:

                        Debug.Assert(

                            this.parser.CurrentEntry != null,

                            "parser.CurrentEntry != null -- otherwise parser.DataKind shouldn't be Entry");

                        this.CurrentEntry.ResolvedObject = this.TargetInstance;

                        this.currentValue = this.materializeEntryPlan.Run(this, this.CurrentEntry, this.expectedType);

                        return true;

                    case AtomDataKind.PagingLinks:

                        break;

                    default:

                        Debug.Assert(

                            this.parser.DataKind == AtomDataKind.Custom,

                            "parser.DataKind == AtomDataKind.Custom -- otherwise AtomMaterializer.Read switch is missing a case");



                        Type underlyingExpectedType = Nullable.GetUnderlyingType(this.expectedType) ?? this.expectedType;

                        ClientType targetType = ClientType.Create(underlyingExpectedType);

                        if (ClientConvert.IsKnownType(underlyingExpectedType))

                        {

                            string elementText = this.parser.ReadCustomElementString();

                            if (elementText != null)

                            {

                                this.currentValue = ClientConvert.ChangeType(elementText, underlyingExpectedType);

                            }



                            return true;

                        }

                        else if (!targetType.IsEntityType && this.parser.IsDataWebElement)

                        {

                            AtomContentProperty property = this.parser.ReadCurrentPropertyValue();

                            if (property == null || property.IsNull)

                            {

                                this.currentValue = null;

                            }

                            else

                            {

                                this.currentValue = targetType.CreateInstance();

                                MaterializeDataValues(targetType, property.Properties, this.ignoreMissingProperties, this.context);

                                ApplyDataValues(targetType, property.Properties, this.ignoreMissingProperties, this.context, this.currentValue);

                            }



                            return true;

                        }



                        break;

                }

            }



            Debug.Assert(this.parser.DataKind == AtomDataKind.Finished, "parser.DataKind == AtomDataKind.None");

            Debug.Assert(this.parser.CurrentEntry == null, "parser.Current == null");

            return false;

        }



        internal void PropagateContinuation<T>(IEnumerable<T> from, DataServiceCollection<T> to)

        {

            DataServiceQueryContinuation continuation;

            if (this.nextLinkTable.TryGetValue(from, out continuation))

            {

                this.nextLinkTable.Add(to, continuation);

                Util.SetNextLinkForCollection(to, continuation);

            }

        }



        #endregion Internal methods.



        #region Private methods.



        private static void CheckEntryToAccessNotNull(AtomEntry entry, string name)

        {

            Debug.Assert(entry != null, "entry != null");

            Debug.Assert(name != null, "name != null");



            if (entry.IsNull)

            {

                throw new NullReferenceException(Strings.AtomMaterializer_EntryToAccessIsNull(name));

            }

        }



        private static ProjectionPlan CreatePlan(QueryComponents queryComponents)

        {

            LambdaExpression projection = queryComponents.Projection;

            ProjectionPlan result;

            if (projection == null)

            {

                result = CreatePlanForDirectMaterialization(queryComponents.LastSegmentType);

            }

            else

            {

                result = ProjectionPlanCompiler.CompilePlan(projection, queryComponents.NormalizerRewrites);

                result.LastSegmentType = queryComponents.LastSegmentType;

            }



            return result;

        }



        private static ProjectionPlan CreatePlanForDirectMaterialization(Type lastSegmentType)

        {

            ProjectionPlan result = new ProjectionPlan();

            result.Plan = AtomMaterializerInvoker.DirectMaterializePlan;

            result.ProjectedType = lastSegmentType;

            result.LastSegmentType = lastSegmentType;

            return result;

        }



        private static ProjectionPlan CreatePlanForShallowMaterialization(Type lastSegmentType)

        {

            ProjectionPlan result = new ProjectionPlan();

            result.Plan = AtomMaterializerInvoker.ShallowMaterializePlan;

            result.ProjectedType = lastSegmentType;

            result.LastSegmentType = lastSegmentType;

            return result;

        }



        private static Action<object, object> GetAddToCollectionDelegate(Type listType)

        {

            Debug.Assert(listType != null, "listType != null");

            

            Type listElementType;

            MethodInfo addMethod = ClientType.GetAddToCollectionMethod(listType, out listElementType);

            ParameterExpression list = Expression.Parameter(typeof(object), "list");

            ParameterExpression item = Expression.Parameter(typeof(object), "element");

            Expression body = Expression.Call(Expression.Convert(list, listType), addMethod, Expression.Convert(item, listElementType));

#if ASTORIA_LIGHT

            LambdaExpression lambda = ExpressionHelpers.CreateLambda(body, list, item);

#else

            LambdaExpression lambda = Expression.Lambda(body, list, item);

#endif

            return (Action<object, object>)lambda.Compile();

        }



        private static object GetOrCreateCollectionProperty(object instance, ClientType.ClientProperty property, Type collectionType)

        {

            Debug.Assert(instance != null, "instance != null");

            Debug.Assert(property != null, "property != null");

            Debug.Assert(property.CollectionType != null, "property.CollectionType != null -- otherwise property isn't a collection");



            object result;

            result = property.GetValue(instance);

            if (result == null)

            {

                if (collectionType == null)

                {

                    collectionType = property.PropertyType;

                    if (collectionType.IsInterface)

                    {

                        collectionType = typeof(System.Collections.ObjectModel.Collection<>).MakeGenericType(property.CollectionType);

                    }

                }



                result = Activator.CreateInstance(collectionType);

                property.SetValue(instance, result, property.PropertyName, false );

            }



            Debug.Assert(result != null, "result != null -- otherwise GetOrCreateCollectionProperty didn't fall back to creation");

            return result;

        }



        private static void MaterializeToList(

            AtomMaterializer materializer,

            IEnumerable list,

            Type nestedExpectedType,

            IEnumerable<AtomEntry> entries)

        {

            Debug.Assert(materializer != null, "materializer != null");

            Debug.Assert(list != null, "list != null");



            Action<object, object> addMethod = GetAddToCollectionDelegate(list.GetType());

            foreach (AtomEntry feedEntry in entries)

            {

                if (!feedEntry.EntityHasBeenResolved)

                {

                    materializer.Materialize(feedEntry, nestedExpectedType,  false);

                }



                addMethod(list, feedEntry.ResolvedObject);

            }

        }



         private static bool MaterializeDataValue(Type type, AtomContentProperty atomProperty, DataServiceContext context)

        {

            Debug.Assert(type != null, "type != null");

            Debug.Assert(atomProperty != null, "atomProperty != null");

            Debug.Assert(context != null, "context != null");



            string propertyTypeName = atomProperty.TypeName;

            string propertyValueText = atomProperty.Text;



            ClientType nestedElementType = null;

            Type underlyingType = Nullable.GetUnderlyingType(type) ?? type;

            bool knownType = ClientConvert.IsKnownType(underlyingType);

            if (!knownType)

            {

                nestedElementType = MaterializeAtom.GetEntryClientType(propertyTypeName, context, type, true);

                Debug.Assert(nestedElementType != null, "nestedElementType != null -- otherwise ReadTypeAttribute (or someone!) should throw");

                knownType = ClientConvert.IsKnownType(nestedElementType.ElementType);

            }



            if (knownType)

            {

                if (atomProperty.IsNull)

                {

                    if (!ClientType.CanAssignNull(type))

                    {

                        throw new InvalidOperationException(Strings.AtomMaterializer_CannotAssignNull(atomProperty.Name, type.FullName));

                    }



                    atomProperty.MaterializedValue = null;

                    return true;

                }

                else

                {

                    object value = propertyValueText;

                    if (propertyValueText != null)

                    {

                        value = ClientConvert.ChangeType(propertyValueText, (null != nestedElementType ? nestedElementType.ElementType : underlyingType));

                    }



                    atomProperty.MaterializedValue = value;

                    return true;

                }

            }



            return false;

        }



        private static void MaterializeDataValues(

            ClientType actualType, 

            List<AtomContentProperty> values,

            bool ignoreMissingProperties,

            DataServiceContext context)

        {

            Debug.Assert(actualType != null, "actualType != null");

            Debug.Assert(values != null, "values != null");

            Debug.Assert(context != null, "context != null");



            foreach (var atomProperty in values)

            {

                string propertyName = atomProperty.Name;

                

                var property = actualType.GetProperty(propertyName, ignoreMissingProperties); // may throw

                if (property == null)

                {

                    continue;

                }



                if (atomProperty.Feed == null && atomProperty.Entry == null)

                {

                    bool materialized = MaterializeDataValue(property.NullablePropertyType, atomProperty, context);

                    if (!materialized && property.CollectionType != null)

                    {

                        throw Error.NotSupported(Strings.ClientType_CollectionOfNonEntities);

                    }

                }

            }

        }



        private static void ApplyDataValue(ClientType type, AtomContentProperty property, bool ignoreMissingProperties, DataServiceContext context, object instance)

        {

            Debug.Assert(type != null, "type != null");

            Debug.Assert(property != null, "property != null");

            Debug.Assert(context != null, "context != null");

            Debug.Assert(instance != null, "instance != context");



            var prop = type.GetProperty(property.Name, ignoreMissingProperties);

            if (prop == null)

            {

                return;

            }



            if (property.Properties != null)

            {

                if (prop.IsKnownType ||

                    ClientConvert.IsKnownType(MaterializeAtom.GetEntryClientType(property.TypeName, context, prop.PropertyType, true).ElementType))

                {

                    throw Error.InvalidOperation(Strings.Deserialize_ExpectingSimpleValue);

                }



                 bool needToSet = false;

                ClientType complexType = ClientType.Create(prop.PropertyType);

                object complexInstance = prop.GetValue(instance);

                if (complexInstance == null)

                {

                    complexInstance = complexType.CreateInstance();

                    needToSet = true;

                }



                MaterializeDataValues(complexType, property.Properties, ignoreMissingProperties, context);

                ApplyDataValues(complexType, property.Properties, ignoreMissingProperties, context, complexInstance);



                if (needToSet)

                {

                    prop.SetValue(instance, complexInstance, property.Name, true );

                }

            }

            else

            {

                prop.SetValue(instance, property.MaterializedValue, property.Name, true );

            }

        }



        private static void ApplyDataValues(ClientType type, IEnumerable<AtomContentProperty> properties, bool ignoreMissingProperties, DataServiceContext context, object instance)

        {

            Debug.Assert(type != null, "type != null");

            Debug.Assert(properties != null, "properties != null");

            Debug.Assert(context != null, "properties != context");

            Debug.Assert(instance != null, "instance != context");



            foreach (var p in properties)

            {

                ApplyDataValue(type, p, ignoreMissingProperties, context, instance);

            }

        }



        private static void SetValueOnPath(List<AtomContentProperty> values, string path, string value, string typeName)

        {

            Debug.Assert(values != null, "values != null");

            Debug.Assert(path != null, "path != null");



            bool existing = true;

            AtomContentProperty property = null;

            foreach (string step in path.Split('/'))

            {

                if (values == null)

                {

                    Debug.Assert(property != null, "property != null -- if values is null then this isn't the first step");

                    property.EnsureProperties();

                    values = property.Properties;

                }



                property = values.Where(v => v.Name == step).FirstOrDefault();

                if (property == null)

                {

                    AtomContentProperty newProperty = new AtomContentProperty();

                    existing = false;

                    newProperty.Name = step;

                    values.Add(newProperty);

                    property = newProperty;

                }

                else

                {

                    if (property.IsNull)

                    {

                        return;

                    }

                }



                values = property.Properties;

            }



            Debug.Assert(property != null, "property != null -- property path should have at least one segment");

            

            if (existing == false)

            {

                property.TypeName = typeName;

                property.Text = value;

            }

        }



        private static void ApplyEntityPropertyMappings(AtomEntry entry, ClientType entryType)

        {

            Debug.Assert(entry != null, "entry != null");

            Debug.Assert(entry.Tag is XElement, "entry.Tag is XElement");

            Debug.Assert(entryType != null, "entryType != null -- othewise how would we know to apply property mappings (note that for projections entry.ActualType may be different that entryType)?");

            Debug.Assert(!entry.EntityPropertyMappingsApplied, "!entry.EntityPropertyMappingsApplied -- EPM should happen only once per entry");



            if (entryType.HasEntityPropertyMappings)

            {

                XElement entryElement = entry.Tag as XElement;

                Debug.Assert(entryElement != null, "entryElement != null");

                ApplyEntityPropertyMappings(entry, entryElement, entryType.EpmTargetTree.SyndicationRoot);

                ApplyEntityPropertyMappings(entry, entryElement, entryType.EpmTargetTree.NonSyndicationRoot);

            }



            entry.EntityPropertyMappingsApplied = true;

        }



        private static void ApplyEntityPropertyMappings(AtomEntry entry, XElement entryElement, EpmTargetPathSegment target)

        {

            Debug.Assert(target != null, "target != null");

            Debug.Assert(!target.HasContent, "!target.HasContent");



            Stack<System.Data.Services.Common.EpmTargetPathSegment> segments = new Stack<System.Data.Services.Common.EpmTargetPathSegment>();

            Stack<XElement> elements = new Stack<XElement>();



            segments.Push(target);

            elements.Push(entryElement);



            while (segments.Count > 0)

            {

                System.Data.Services.Common.EpmTargetPathSegment segment = segments.Pop();

                XElement element = elements.Pop();

                if (segment.HasContent)

                {

                    var node = element.Nodes().Where(n => n.NodeType == XmlNodeType.Text || n.NodeType == XmlNodeType.SignificantWhitespace).FirstOrDefault();

                    string elementValue = (node == null) ? null : ((XText)node).Value;

                    Debug.Assert(segment.EpmInfo != null, "segment.EpmInfo != null -- otherwise segment.HasValue should be false");



                    string path = segment.EpmInfo.Attribute.SourcePath;

                    string typeName = (string)element.Attribute(XName.Get(XmlConstants.AtomTypeAttributeName, XmlConstants.DataWebMetadataNamespace));



                    SetValueOnPath(entry.DataValues, path, elementValue, typeName);

                }



                foreach (var item in segment.SubSegments)

                {

                    if (item.IsAttribute)

                    {

                        string localName = item.SegmentName.Substring(1);

                        var attribute = element.Attribute(XName.Get(localName, item.SegmentNamespaceUri));

                        if (attribute != null)

                        {

                            SetValueOnPath(entry.DataValues, item.EpmInfo.Attribute.SourcePath, attribute.Value, null);

                        }

                    }

                    else

                    {

                        var child = element.Element(XName.Get(item.SegmentName, item.SegmentNamespaceUri));

                        if (child != null)

                        {

                            segments.Push(item);

                            elements.Push(child);

                        }

                    }

                }



                Debug.Assert(segments.Count == elements.Count, "segments.Count == elements.Count -- otherwise they're out of sync");

            }

        }



        private static AtomContentProperty GetPropertyOrThrow(List<AtomContentProperty> properties, string propertyName)

        {

            AtomContentProperty atomProperty = null;

            if (properties != null)

            {

                atomProperty = properties.Where(p => p.Name == propertyName).FirstOrDefault();

            }



            if (atomProperty == null)

            {

                throw new InvalidOperationException(Strings.AtomMaterializer_PropertyMissing(propertyName));

            }



            Debug.Assert(atomProperty != null, "atomProperty != null");

            return atomProperty;

        }



        private static AtomContentProperty GetPropertyOrThrow(AtomEntry entry, string propertyName)

        {

            AtomContentProperty atomProperty = null;

            var properties = entry.DataValues;

            if (properties != null)

            {

                atomProperty = proper…

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