1// Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_HOST_ITERATOR_H_ 6#define CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_HOST_ITERATOR_H_ 7 8#include <list> 9 10#include "content/common/content_export.h" 11 12namespace IPC { 13class Message; 14} 15 16namespace content { 17class BrowserChildProcessHostDelegate; 18class BrowserChildProcessHostImpl; 19struct ChildProcessData; 20 21// This class allows iteration through either all child processes, or ones of a 22// specific type, depending on which constructor is used. Note that this should 23// be done from the IO thread and that the iterator should not be kept around as 24// it may be invalidated on subsequent event processing in the event loop. 25class CONTENT_EXPORT BrowserChildProcessHostIterator { 26 public: 27 BrowserChildProcessHostIterator(); 28 explicit BrowserChildProcessHostIterator(int type); 29 ~BrowserChildProcessHostIterator(); 30 31 // These methods work on the current iterator object. Only call them if 32 // Done() returns false. 33 bool operator++(); 34 bool Done(); 35 const ChildProcessData& GetData(); 36 bool Send(IPC::Message* message); 37 BrowserChildProcessHostDelegate* GetDelegate(); 38 39 private: 40 bool all_; 41 int process_type_; 42 std::list<BrowserChildProcessHostImpl*>::iterator iterator_; 43}; 44 45// Helper class so that subclasses of BrowserChildProcessHostDelegate can be 46// iterated with no casting needing. Note that because of the components build, 47// this class can only be used by BCPHD implementations that live in content, 48// otherwise link errors will result. 49template <class T> 50class CONTENT_EXPORT BrowserChildProcessHostTypeIterator 51 : public BrowserChildProcessHostIterator { 52 public: 53 explicit BrowserChildProcessHostTypeIterator(int process_type) 54 : BrowserChildProcessHostIterator(process_type) {} 55 T* operator->() { 56 return static_cast<T*>(GetDelegate()); 57 } 58 T* operator*() { 59 return static_cast<T*>(GetDelegate()); 60 } 61}; 62 63}; // namespace content 64 65#endif // CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_HOST_ITERATOR_H_ 66