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
|
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/sync_file_system/remote_sync_operation_resolver.h"
#include "base/logging.h"
namespace sync_file_system {
namespace {
bool IsValidCombination(const FileChangeList& local_changes,
SyncFileType local_file_type,
bool is_conflicting) {
if (local_changes.empty()) {
// We never leave directory or non-existing entry in conflicting state, so
// if there're no local changes it shouldn't be in conflicting state or
// should be a file.
return !(is_conflicting && local_file_type != SYNC_FILE_TYPE_FILE);
}
switch (local_file_type) {
case SYNC_FILE_TYPE_UNKNOWN:
return local_changes.back().IsDelete();
case SYNC_FILE_TYPE_FILE:
case SYNC_FILE_TYPE_DIRECTORY:
return !local_changes.back().IsDelete() &&
local_changes.back().file_type() == local_file_type;
}
return false;
}
} // namespace
RemoteSyncOperationType
RemoteSyncOperationResolver::Resolve(const FileChange& remote_file_change,
const FileChangeList& local_changes,
SyncFileType local_file_type,
bool is_conflicting) {
switch (remote_file_change.change()) {
case FileChange::FILE_CHANGE_ADD_OR_UPDATE:
switch (remote_file_change.file_type()) {
case SYNC_FILE_TYPE_FILE:
return is_conflicting
? ResolveForAddOrUpdateFileInConflict(local_changes,
local_file_type)
: ResolveForAddOrUpdateFile(local_changes, local_file_type);
case SYNC_FILE_TYPE_DIRECTORY:
return is_conflicting
? ResolveForAddDirectoryInConflict(local_changes, local_file_type)
: ResolveForAddDirectory(local_changes, local_file_type);
case SYNC_FILE_TYPE_UNKNOWN:
NOTREACHED();
return REMOTE_SYNC_OPERATION_FAIL;
}
break;
case FileChange::FILE_CHANGE_DELETE:
switch (remote_file_change.file_type()) {
case SYNC_FILE_TYPE_FILE:
return is_conflicting
? ResolveForDeleteFileInConflict(local_changes, local_file_type)
: ResolveForDeleteFile(local_changes, local_file_type);
case SYNC_FILE_TYPE_DIRECTORY:
return is_conflicting
? ResolveForDeleteDirectoryInConflict(local_changes,
local_file_type)
: ResolveForDeleteDirectory(local_changes, local_file_type);
case SYNC_FILE_TYPE_UNKNOWN:
NOTREACHED();
return REMOTE_SYNC_OPERATION_FAIL;
}
break;
}
NOTREACHED();
return REMOTE_SYNC_OPERATION_FAIL;
}
RemoteSyncOperationType
RemoteSyncOperationResolver::ResolveForAddOrUpdateFile(
const FileChangeList& local_changes,
SyncFileType local_file_type) {
// Invalid combination should never happen.
if (!IsValidCombination(local_changes, local_file_type, false))
return REMOTE_SYNC_OPERATION_FAIL;
switch (local_file_type) {
case SYNC_FILE_TYPE_UNKNOWN:
return REMOTE_SYNC_OPERATION_ADD_FILE;
case SYNC_FILE_TYPE_FILE:
if (local_changes.empty())
return REMOTE_SYNC_OPERATION_UPDATE_FILE;
return REMOTE_SYNC_OPERATION_CONFLICT;
case SYNC_FILE_TYPE_DIRECTORY:
// Currently we always prioritize directories over files.
return REMOTE_SYNC_OPERATION_RESOLVE_TO_LOCAL;
}
return REMOTE_SYNC_OPERATION_FAIL;
}
RemoteSyncOperationType
RemoteSyncOperationResolver::ResolveForAddOrUpdateFileInConflict(
const FileChangeList& local_changes,
SyncFileType local_file_type) {
// Invalid combination should never happen.
if (!IsValidCombination(local_changes, local_file_type, true))
return REMOTE_SYNC_OPERATION_FAIL;
switch (local_file_type) {
case SYNC_FILE_TYPE_UNKNOWN:
return REMOTE_SYNC_OPERATION_RESOLVE_TO_REMOTE;
case SYNC_FILE_TYPE_FILE:
return REMOTE_SYNC_OPERATION_CONFLICT;
case SYNC_FILE_TYPE_DIRECTORY:
return REMOTE_SYNC_OPERATION_RESOLVE_TO_LOCAL;
}
return REMOTE_SYNC_OPERATION_FAIL;
}
RemoteSyncOperationType
RemoteSyncOperationResolver::ResolveForAddDirectory(
const FileChangeList& local_changes,
SyncFileType local_file_type) {
// Invalid combination should never happen.
if (!IsValidCombination(local_changes, local_file_type, false))
return REMOTE_SYNC_OPERATION_FAIL;
switch (local_file_type) {
case SYNC_FILE_TYPE_UNKNOWN:
if (local_changes.empty())
return REMOTE_SYNC_OPERATION_ADD_DIRECTORY;
return REMOTE_SYNC_OPERATION_RESOLVE_TO_REMOTE;
case SYNC_FILE_TYPE_FILE:
return REMOTE_SYNC_OPERATION_RESOLVE_TO_REMOTE;
case SYNC_FILE_TYPE_DIRECTORY:
return REMOTE_SYNC_OPERATION_NONE;
}
return REMOTE_SYNC_OPERATION_FAIL;
}
RemoteSyncOperationType
RemoteSyncOperationResolver::ResolveForAddDirectoryInConflict(
const FileChangeList& local_changes,
SyncFileType local_file_type) {
// Invalid combination should never happen.
if (!IsValidCombination(local_changes, local_file_type, true))
return REMOTE_SYNC_OPERATION_FAIL;
switch (local_file_type) {
case SYNC_FILE_TYPE_UNKNOWN:
case SYNC_FILE_TYPE_FILE:
return REMOTE_SYNC_OPERATION_RESOLVE_TO_REMOTE;
case SYNC_FILE_TYPE_DIRECTORY:
return REMOTE_SYNC_OPERATION_RESOLVE_TO_LOCAL;
}
return REMOTE_SYNC_OPERATION_FAIL;
}
RemoteSyncOperationType
RemoteSyncOperationResolver::ResolveForDeleteFile(
const FileChangeList& local_changes,
SyncFileType local_file_type) {
// Invalid combination should never happen.
if (!IsValidCombination(local_changes, local_file_type, false))
return REMOTE_SYNC_OPERATION_FAIL;
switch (local_file_type) {
case SYNC_FILE_TYPE_UNKNOWN:
return REMOTE_SYNC_OPERATION_DELETE_METADATA;
case SYNC_FILE_TYPE_FILE:
if (local_changes.empty())
return REMOTE_SYNC_OPERATION_DELETE_FILE;
return REMOTE_SYNC_OPERATION_NONE;
case SYNC_FILE_TYPE_DIRECTORY:
return REMOTE_SYNC_OPERATION_NONE;
}
return REMOTE_SYNC_OPERATION_FAIL;
}
RemoteSyncOperationType
RemoteSyncOperationResolver::ResolveForDeleteFileInConflict(
const FileChangeList& local_changes,
SyncFileType local_file_type) {
// Invalid combination should never happen.
if (!IsValidCombination(local_changes, local_file_type, true))
return REMOTE_SYNC_OPERATION_FAIL;
switch (local_file_type) {
case SYNC_FILE_TYPE_UNKNOWN:
return REMOTE_SYNC_OPERATION_DELETE_METADATA;
case SYNC_FILE_TYPE_FILE:
case SYNC_FILE_TYPE_DIRECTORY:
return REMOTE_SYNC_OPERATION_RESOLVE_TO_LOCAL;
}
return REMOTE_SYNC_OPERATION_FAIL;
}
RemoteSyncOperationType
RemoteSyncOperationResolver::ResolveForDeleteDirectory(
const FileChangeList& local_changes,
SyncFileType local_file_type) {
// Invalid combination should never happen.
if (!IsValidCombination(local_changes, local_file_type, false))
return REMOTE_SYNC_OPERATION_FAIL;
switch (local_file_type) {
case SYNC_FILE_TYPE_UNKNOWN:
return REMOTE_SYNC_OPERATION_NONE;
case SYNC_FILE_TYPE_FILE:
return REMOTE_SYNC_OPERATION_RESOLVE_TO_LOCAL;
case SYNC_FILE_TYPE_DIRECTORY:
if (local_changes.empty())
return REMOTE_SYNC_OPERATION_DELETE_DIRECTORY;
return REMOTE_SYNC_OPERATION_RESOLVE_TO_LOCAL;
}
return REMOTE_SYNC_OPERATION_FAIL;
}
RemoteSyncOperationType
RemoteSyncOperationResolver::ResolveForDeleteDirectoryInConflict(
const FileChangeList& local_changes,
SyncFileType local_file_type) {
// Invalid combination should never happen.
if (!IsValidCombination(local_changes, local_file_type, true))
return REMOTE_SYNC_OPERATION_FAIL;
switch (local_file_type) {
case SYNC_FILE_TYPE_UNKNOWN:
return REMOTE_SYNC_OPERATION_DELETE_METADATA;
case SYNC_FILE_TYPE_FILE:
case SYNC_FILE_TYPE_DIRECTORY:
return REMOTE_SYNC_OPERATION_RESOLVE_TO_LOCAL;
}
return REMOTE_SYNC_OPERATION_FAIL;
}
} // namespace sync_file_system
|
