1 // Copyright (c) 2011 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 CHROME_INSTALLER_UTIL_CONDITIONAL_WORK_ITEM_LIST_H_ 6 #define CHROME_INSTALLER_UTIL_CONDITIONAL_WORK_ITEM_LIST_H_ 7 8 #include "chrome/installer/util/work_item_list.h" 9 10 #include "base/files/file_path.h" 11 #include "base/memory/scoped_ptr.h" 12 13 // A WorkItemList subclass that permits conditionally executing a set of 14 // WorkItems. 15 class ConditionalWorkItemList : public WorkItemList { 16 public: 17 explicit ConditionalWorkItemList(Condition* condition); 18 virtual ~ConditionalWorkItemList(); 19 20 // If condition_->ShouldRun() returns true, then execute the items in this 21 // list and return true iff they all succeed. If condition_->ShouldRun() 22 // returns false, does nothing and returns true. 23 virtual bool Do(); 24 25 // Does a rollback of the items (if any) that were run in Do. 26 virtual void Rollback(); 27 28 protected: 29 // Pointer to a Condition that is used to determine whether to run this 30 // WorkItemList. 31 scoped_ptr<Condition> condition_; 32 }; 33 34 35 // Pre-defined conditions: 36 //------------------------------------------------------------------------------ 37 class ConditionRunIfFileExists : public WorkItem::Condition { 38 public: 39 explicit ConditionRunIfFileExists(const base::FilePath& key_path) 40 : key_path_(key_path) {} 41 bool ShouldRun() const; 42 43 private: 44 base::FilePath key_path_; 45 }; 46 47 // Condition class that inverts the ShouldRun result of another Condition. 48 // This class assumes ownership of original_condition. 49 class Not : public WorkItem::Condition { 50 public: 51 explicit Not(WorkItem::Condition* original_condition) 52 : original_condition_(original_condition) {} 53 bool ShouldRun() const; 54 55 private: 56 scoped_ptr<WorkItem::Condition> original_condition_; 57 }; 58 59 60 #endif // CHROME_INSTALLER_UTIL_CONDITIONAL_WORK_ITEM_LIST_H_ 61
