1 files changed, 154 insertions, 0 deletions
diff --git a/components/drive/file_change.cc b/components/drive/file_change.cc
new file mode 100644
index 0000000..0bdd7bc
--- /dev/null
+++ b/components/drive/file_change.cc
@@ -0,0 +1,154 @@
+// Copyright (c) 2012 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 "components/drive/file_change.h"
+
+#include <sstream>
+
+#include "base/logging.h"
+#include "base/strings/stringprintf.h"
+#include "components/drive/drive.pb.h"
+
+namespace drive {
+
+FileChange::Change::Change(ChangeType change, FileType file_type)
+    : change_(change), file_type_(file_type) {
+}
+
+std::string FileChange::Change::DebugString() const {
+  const char* change_string = NULL;
+  switch (change()) {
+    case CHANGE_TYPE_ADD_OR_UPDATE:
+      change_string = "ADD_OR_UPDATE";
+      break;
+    case CHANGE_TYPE_DELETE:
+      change_string = "DELETE";
+      break;
+  }
+  const char* type_string = "NO_INFO";
+  switch (file_type()) {
+    case FileChange::FILE_TYPE_FILE:
+      type_string = "FILE";
+      break;
+    case FileChange::FILE_TYPE_DIRECTORY:
+      type_string = "DIRECTORY";
+      break;
+    case FILE_TYPE_NO_INFO:
+      // Keeps it as "no_info".
+      break;
+  }
+  return base::StringPrintf("%s:%s", change_string, type_string);
+}
+
+FileChange::ChangeList::ChangeList() {
+}
+FileChange::ChangeList::~ChangeList() {
+}
+
+void FileChange::ChangeList::Update(const Change& new_change) {
+  if (list_.empty()) {
+    list_.push_back(new_change);
+    return;
+  }
+
+  Change& last = list_.back();
+  if (last.IsFile() != new_change.IsFile()) {
+    list_.push_back(new_change);
+    return;
+  }
+
+  if (last.change() == new_change.change())
+    return;
+
+  // ADD + DELETE on directory -> revert
+  if (!last.IsFile() && last.IsAddOrUpdate() && new_change.IsDelete()) {
+    list_.pop_back();
+    return;
+  }
+
+  // DELETE + ADD/UPDATE -> ADD/UPDATE
+  // ADD/UPDATE + DELETE -> DELETE
+  last = new_change;
+}
+
+FileChange::ChangeList FileChange::ChangeList::PopAndGetNewList() const {
+  ChangeList changes;
+  changes.list_ = this->list_;
+  changes.list_.pop_front();
+  return changes;
+}
+
+std::string FileChange::ChangeList::DebugString() const {
+  std::ostringstream ss;
+  ss << "{ ";
+  for (size_t i = 0; i < list_.size(); ++i)
+    ss << list_[i].DebugString() << ", ";
+  ss << "}";
+  return ss.str();
+}
+
+FileChange::FileChange() {
+}
+FileChange::~FileChange() {}
+
+void FileChange::Update(const base::FilePath file_path,
+                        const FileChange::Change& new_change) {
+  map_[file_path].Update(new_change);
+}
+
+void FileChange::Update(const base::FilePath file_path,
+                        const FileChange::ChangeList& new_change) {
+  for (ChangeList::List::const_iterator it = new_change.list().begin();
+       it != new_change.list().end();
+       it++) {
+    map_[file_path].Update(*it);
+  }
+}
+
+void FileChange::Update(const base::FilePath file_path,
+                        FileType file_type,
+                        FileChange::ChangeType change) {
+  Update(file_path, FileChange::Change(change, file_type));
+}
+
+void FileChange::Update(const base::FilePath file_path,
+                        const ResourceEntry& entry,
+                        FileChange::ChangeType change) {
+  FileType type = !entry.has_file_info()
+                      ? FILE_TYPE_NO_INFO
+                      : entry.file_info().is_directory() ? FILE_TYPE_DIRECTORY
+                                                         : FILE_TYPE_FILE;
+
+  Update(file_path, type, change);
+}
+
+void FileChange::Apply(const FileChange& new_changed_files) {
+  for (Map::const_iterator it = new_changed_files.map().begin();
+       it != new_changed_files.map().end();
+       it++) {
+    Update(it->first, it->second);
+  }
+}
+
+size_t FileChange::CountDirectory(const base::FilePath& directory_path) const {
+  size_t count = 0;
+  for (Map::const_iterator it = map_.begin(); it != map_.end(); it++) {
+    if (it->first.DirName() == directory_path)
+      count++;
+  }
+  return count;
+}
+
+std::string FileChange::DebugString() const {
+  std::ostringstream ss;
+  ss << "{ ";
+  for (FileChange::Map::const_iterator it = map_.begin(); it != map_.end();
+       it++) {
+    ss << it->first.value() << ": " << it->second.DebugString() << ", ";
+  }
+  ss << "}";
+  return ss.str();
+}
+
+}  // namespace drive