File: AtomMaterializerLog.cs

package info (click to toggle)
mono 4.6.2.7+dfsg-1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 778,148 kB
  • ctags: 914,052
  • sloc: cs: 5,779,509; xml: 2,773,713; ansic: 432,645; sh: 14,749; makefile: 12,361; perl: 2,488; python: 1,434; cpp: 849; asm: 531; sql: 95; sed: 16; php: 1
file content (332 lines) | stat: -rw-r--r-- 12,777 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
//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.Diagnostics;
    using System.Linq;
    using System.Reflection;
    using System.Xml;
    using System.Xml.Linq;
    using System.Text;

    #endregion Namespaces.

    internal class AtomMaterializerLog
    {
        #region Private fields.

        private readonly DataServiceContext context;

        private readonly Dictionary<String, AtomEntry> appendOnlyEntries;

        private readonly Dictionary<String, AtomEntry> foundEntriesWithMedia;

        private readonly Dictionary<String, AtomEntry> identityStack;

        private readonly List<LinkDescriptor> links;

        private readonly MergeOption mergeOption;

        private object insertRefreshObject;

        #endregion Private fields.

        #region Constructors.

        internal AtomMaterializerLog(DataServiceContext context, MergeOption mergeOption)
        {
            Debug.Assert(context != null, "context != null");
            this.appendOnlyEntries = new Dictionary<string, AtomEntry>(EqualityComparer<String>.Default);
            this.context = context;
            this.mergeOption = mergeOption;
            this.foundEntriesWithMedia = new Dictionary<String, AtomEntry>(EqualityComparer<String>.Default);
            this.identityStack = new Dictionary<String, AtomEntry>(EqualityComparer<String>.Default);
            this.links = new List<LinkDescriptor>();
        }

        #endregion Constructors.

        #region Internal properties.

        internal bool Tracking
        {
            get 
            { 
                return this.mergeOption != MergeOption.NoTracking; 
            }
        }

        #endregion Internal properties.

        #region Internal methods.

        internal void ApplyToContext()
        {
            Debug.Assert(
                this.mergeOption != MergeOption.OverwriteChanges || this.foundEntriesWithMedia.Count == 0,
                "mergeOption != MergeOption.OverwriteChanges || foundEntriesWithMedia.Count == 0 - we only use the 'entries-with-media' lookaside when we're not in overwrite mode, otherwise we track everything through identity stack");

            if (!this.Tracking)
            {
                return;
            }

            foreach (KeyValuePair<String, AtomEntry> entity in this.identityStack)
            {
                AtomEntry entry = entity.Value;
                if (entry.CreatedByMaterializer ||
                    entry.ResolvedObject == this.insertRefreshObject ||
                    entry.ShouldUpdateFromPayload)
                {
                    EntityDescriptor descriptor = new EntityDescriptor(entity.Key, entry.QueryLink, entry.EditLink, entry.ResolvedObject, null, null, null, entry.ETagText, EntityStates.Unchanged);
                    descriptor = this.context.InternalAttachEntityDescriptor(descriptor, false);

                    descriptor.State = EntityStates.Unchanged;

                    this.ApplyMediaEntryInformation(entry, descriptor);
                    descriptor.ServerTypeName = entry.TypeName;
                }
                else
                {
                    EntityStates state;
                    this.context.TryGetEntity(entity.Key, entry.ETagText, this.mergeOption, out state);
                }
            }

            foreach (AtomEntry entry in this.foundEntriesWithMedia.Values)
            {
                Debug.Assert(entry.ResolvedObject != null, "entry.ResolvedObject != null -- otherwise it wasn't found");
                EntityDescriptor descriptor = this.context.GetEntityDescriptor(entry.ResolvedObject);
                this.ApplyMediaEntryInformation(entry, descriptor);
            }

            foreach (LinkDescriptor link in this.links)
            {
                if (EntityStates.Added == link.State)
                {
                    if ((EntityStates.Deleted == this.context.GetEntityDescriptor(link.Target).State) ||
                        (EntityStates.Deleted == this.context.GetEntityDescriptor(link.Source).State))
                    {
                        this.context.DeleteLink(link.Source, link.SourceProperty, link.Target);
                    }
                    else
                    {
                        this.context.AttachLink(link.Source, link.SourceProperty, link.Target, this.mergeOption);
                    }
                }
                else if (EntityStates.Modified == link.State)
                {
                    object target = link.Target;
                    if (MergeOption.PreserveChanges == this.mergeOption)
                    {
                        LinkDescriptor end = this.context.GetLinks(link.Source, link.SourceProperty).FirstOrDefault();
                        if (null != end && null == end.Target)
                        {
                            continue;
                        }

                        if ((null != target) && (EntityStates.Deleted == this.context.GetEntityDescriptor(target).State) ||
                            (EntityStates.Deleted == this.context.GetEntityDescriptor(link.Source).State))
                        {
                            target = null;
                        }
                    }

                    this.context.AttachLink(link.Source, link.SourceProperty, target, this.mergeOption);
                }
                else
                {
                    Debug.Assert(EntityStates.Detached == link.State, "not detached link");
                    this.context.DetachLink(link.Source, link.SourceProperty, link.Target);
                }
            }
        }

        internal void Clear()
        {
            this.foundEntriesWithMedia.Clear();
            this.identityStack.Clear();
            this.links.Clear();
            this.insertRefreshObject = null;
        }

        internal void FoundExistingInstance(AtomEntry entry)
        {
            Debug.Assert(entry != null, "entry != null");
            Debug.Assert(ShouldTrackWithContext(entry), "Existing entries should be entity");

            if (this.mergeOption == MergeOption.OverwriteChanges)
            {
                this.identityStack[entry.Identity] = entry;
            }
            else if (this.Tracking && entry.MediaLinkEntry == true)
            {
                this.foundEntriesWithMedia[entry.Identity] = entry;
            }
        }

        internal void FoundTargetInstance(AtomEntry entry)
        {
            Debug.Assert(entry != null, "entry != null");
            Debug.Assert(entry.ResolvedObject != null, "entry.ResolvedObject != null -- otherwise this is not a target");

            if (ShouldTrackWithContext(entry))
            {
                this.context.AttachIdentity(entry.Identity, entry.QueryLink, entry.EditLink, entry.ResolvedObject, entry.ETagText);
                this.identityStack.Add(entry.Identity, entry);
                this.insertRefreshObject = entry.ResolvedObject;
            }
        }

        internal bool TryResolve(AtomEntry entry, out AtomEntry existingEntry)
        {
            Debug.Assert(entry != null, "entry != null");
            Debug.Assert(entry.Identity != null, "entry.Identity != null");

            if (this.identityStack.TryGetValue(entry.Identity, out existingEntry))
            {
                return true;
            }

            if (this.appendOnlyEntries.TryGetValue(entry.Identity, out existingEntry))
            {
                EntityStates state;
                this.context.TryGetEntity(entry.Identity, entry.ETagText, this.mergeOption, out state);
                if (state == EntityStates.Unchanged)
                {
                    return true;
                }
                else
                {
                    this.appendOnlyEntries.Remove(entry.Identity);
                }
            }

            existingEntry = null;
            return false;
        }

        internal void AddedLink(AtomEntry source, string propertyName, object target)
        {
            Debug.Assert(source != null, "source != null");
            Debug.Assert(propertyName != null, "propertyName != null");

            if (!this.Tracking)
            {
                return;
            }

            if (ShouldTrackWithContext(source) && ShouldTrackWithContext(target))
            {
                LinkDescriptor item = new LinkDescriptor(source.ResolvedObject, propertyName, target, EntityStates.Added);
                this.links.Add(item);
            }
        }

        internal void CreatedInstance(AtomEntry entry)
        {
            Debug.Assert(entry != null, "entry != null");
            Debug.Assert(entry.ResolvedObject != null, "entry.ResolvedObject != null -- otherwise, what did we create?");
            Debug.Assert(entry.CreatedByMaterializer, "entry.CreatedByMaterializer -- otherwise we shouldn't be calling this");

            if (ShouldTrackWithContext(entry))
            {
                this.identityStack.Add(entry.Identity, entry);
                if (this.mergeOption == MergeOption.AppendOnly)
                {
                    this.appendOnlyEntries.Add(entry.Identity, entry);
                }
            }
        }

        internal void RemovedLink(AtomEntry source, string propertyName, object target)
        {
            Debug.Assert(source != null, "source != null");
            Debug.Assert(propertyName != null, "propertyName != null");

            if (ShouldTrackWithContext(source) && ShouldTrackWithContext(target))
            {
                Debug.Assert(this.Tracking, "this.Tracking -- otherwise there's an 'if' missing (it happens to be that the assert holds for all current callers");
                LinkDescriptor item = new LinkDescriptor(source.ResolvedObject, propertyName, target, EntityStates.Detached);
                this.links.Add(item);
            }
        }

        internal void SetLink(AtomEntry source, string propertyName, object target)
        {
            Debug.Assert(source != null, "source != null");
            Debug.Assert(propertyName != null, "propertyName != null");

            if (!this.Tracking)
            {
                return;
            }

            if (ShouldTrackWithContext(source) && ShouldTrackWithContext(target))
            {
                Debug.Assert(this.Tracking, "this.Tracking -- otherwise there's an 'if' missing (it happens to be that the assert holds for all current callers");
                LinkDescriptor item = new LinkDescriptor(source.ResolvedObject, propertyName, target, EntityStates.Modified);
                this.links.Add(item);
            }
        }

        #endregion Internal methods.

        #region Private methods.

        private static bool ShouldTrackWithContext(AtomEntry entry)
        {
            Debug.Assert(entry.ActualType != null, "Entry with no type added to log");
            return entry.ActualType.IsEntityType;
        }

        private static bool ShouldTrackWithContext(object entity)
        {
            if (entity == null)
            {
                return true;
            }

            ClientType type = ClientType.Create(entity.GetType());
            return type.IsEntityType;
        }

        private void ApplyMediaEntryInformation(AtomEntry entry, EntityDescriptor descriptor)
        {
            Debug.Assert(entry != null, "entry != null");
            Debug.Assert(descriptor != null, "descriptor != null");

            if (entry.MediaEditUri != null || entry.MediaContentUri != null)
            {
                if (entry.MediaEditUri != null)
                {
                    descriptor.EditStreamUri = new Uri(this.context.BaseUriWithSlash, entry.MediaEditUri);
                }

                if (entry.MediaContentUri != null)
                {
                    descriptor.ReadStreamUri = new Uri(this.context.BaseUriWithSlash, entry.MediaContentUri);
                }

                descriptor.StreamETag = entry.StreamETagText;
            }
        }

        #endregion Private methods.
    }
}