chrome/browser/sync_file_system/file_change.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <sstream>
   6
   7 #include "base/logging.h"
   8 #include "base/strings/stringprintf.h"
   9 #include "chrome/browser/sync_file_system/file_change.h"
  10
  11 namespace sync_file_system {
  12
  13 FileChange::FileChange(
  14     ChangeType change,
  15     SyncFileType file_type)
  16     : change_(change),
  17       file_type_(file_type) {}
  18
  19 std::string FileChange::DebugString() const {
  20   const char* change_string = nullptr;
  21   switch (change()) {
  22     case FILE_CHANGE_ADD_OR_UPDATE:
  23       change_string = "ADD_OR_UPDATE";
  24       break;
  25     case FILE_CHANGE_DELETE:
  26       change_string = "DELETE";
  27       break;
  28   }
  29   const char* type_string = "UNKNOWN";
  30   switch (file_type()) {
  31     case SYNC_FILE_TYPE_FILE:
  32       type_string = "FILE";
  33       break;
  34     case SYNC_FILE_TYPE_DIRECTORY:
  35       type_string = "DIRECTORY";
  36       break;
  37     case SYNC_FILE_TYPE_UNKNOWN:
  38       type_string = "UNKNOWN";
  39       break;
  40   }
  41   return base::StringPrintf("%s:%s", change_string, type_string);
  42 }
  43
  44 FileChangeList::FileChangeList() {}
  45 FileChangeList::~FileChangeList() {}
  46
  47 void FileChangeList::Update(const FileChange& new_change) {
  48   if (list_.empty()) {
  49     list_.push_back(new_change);
  50     return;
  51   }
  52
  53   FileChange& last = list_.back();
  54   if (last.IsFile() != new_change.IsFile()) {
  55     list_.push_back(new_change);
  56     return;
  57   }
  58
  59   if (last.change() == new_change.change())
  60     return;
  61
  62   // ADD + DELETE on directory -> revert
  63   if (!last.IsFile() && last.IsAddOrUpdate() && new_change.IsDelete()) {
  64     list_.pop_back();
  65     return;
  66   }
  67
  68   // DELETE + ADD/UPDATE -> ADD/UPDATE
  69   // ADD/UPDATE + DELETE -> DELETE
  70   last = new_change;
  71 }
  72
  73 FileChangeList FileChangeList::PopAndGetNewList() const {
  74   FileChangeList changes;
  75   changes.list_ = this->list_;
  76   changes.list_.pop_front();
  77   return changes;
  78 }
  79
  80 std::string FileChangeList::DebugString() const {
  81   std::ostringstream ss;
  82   ss << "{ ";
  83   for (size_t i = 0; i < list_.size(); ++i)
  84     ss << list_[i].DebugString() << ", ";
  85   ss << "}";
  86   return ss.str();
  87 }
  88
  89 }  // namespace sync_file_system