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      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 = NULL;
     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
     90