1 // Copyright 2014 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 #ifndef COMPONENTS_ENHANCED_BOOKMARKS_ITEM_POSITION_H_ 6 #define COMPONENTS_ENHANCED_BOOKMARKS_ITEM_POSITION_H_ 7 8 #include <string> 9 #include <vector> 10 11 namespace enhanced_bookmarks { 12 13 // Convenience class for generating string based relative ordering between 14 // bookmark nodes. 15 class ItemPosition { 16 public: 17 ~ItemPosition(); 18 19 // Creates a position suitable to use as a starting point. 20 static ItemPosition CreateInitialPosition(); 21 22 // Creates positions relative to other positions. 23 static ItemPosition CreateBefore(const ItemPosition& other); 24 static ItemPosition CreateBetween(const ItemPosition& before, 25 const ItemPosition& after); 26 static ItemPosition CreateAfter(const ItemPosition& other); 27 28 bool IsValid() const; 29 30 // Returns a string representation of the position. The string representations 31 // of two position have the same ordering as the positions themselves when 32 // compared using ASCII order. 33 std::string ToString() const; 34 35 // Comparison functions. 36 bool Equals(const ItemPosition& other) const; 37 bool LessThan(const ItemPosition& other) const; 38 39 private: 40 typedef std::vector<unsigned char> PositionVector; 41 42 ItemPosition(); 43 explicit ItemPosition(const PositionVector& position); 44 45 static PositionVector CreateBeforeImpl(const PositionVector& before, 46 size_t from_index); 47 static PositionVector CreateBetweenImpl(const PositionVector& before, 48 const PositionVector& after); 49 static PositionVector CreateAfterImpl(const PositionVector& after, 50 size_t from_index); 51 52 PositionVector position_; 53 }; 54 55 } // namespace enhanced_bookmarks 56 57 #endif // COMPONENTS_ENHANCED_BOOKMARKS_ITEM_POSITION_H_ 58
