mirror of
https://bitbucket.org/chromiumembedded/cef
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261 lines
7.8 KiB
C++
261 lines
7.8 KiB
C++
// Copyright (c) 2014 The Chromium Embedded Framework Authors. All rights
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// reserved. Use of this source code is governed by a BSD-style license that
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// can be found in the LICENSE file.
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#ifndef CEF_LIBCEF_DLL_WRAPPER_CEF_BROWSER_INFO_MAP_H_
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#define CEF_LIBCEF_DLL_WRAPPER_CEF_BROWSER_INFO_MAP_H_
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#pragma once
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#include <map>
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#include "include/base/cef_logging.h"
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#include "include/base/cef_macros.h"
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// Default traits for CefBrowserInfoMap. Override to provide different object
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// destruction behavior.
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template <typename ObjectType>
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struct DefaultCefBrowserInfoMapTraits {
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static void Destruct(ObjectType info) { delete info; }
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};
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// Maps an arbitrary IdType to an arbitrary ObjectType on a per-browser basis.
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template <typename IdType,
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typename ObjectType,
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typename Traits = DefaultCefBrowserInfoMapTraits<ObjectType>>
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class CefBrowserInfoMap {
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public:
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// Implement this interface to visit and optionally delete objects in the map.
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class Visitor {
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public:
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typedef IdType InfoIdType;
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typedef ObjectType InfoObjectType;
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// Called once for each info object. Set |remove| to true to remove the
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// object from the map. It is safe to destruct removed objects in this
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// callback. Return true to continue iterating or false to stop iterating.
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virtual bool OnNextInfo(int browser_id,
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InfoIdType info_id,
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InfoObjectType info,
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bool* remove) = 0;
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protected:
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virtual ~Visitor() {}
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};
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CefBrowserInfoMap() {}
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~CefBrowserInfoMap() { clear(); }
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// Add an object associated with the specified ID values.
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void Add(int browser_id, IdType info_id, ObjectType info) {
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InfoMap* info_map = nullptr;
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typename BrowserInfoMap::const_iterator it_browser =
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browser_info_map_.find(browser_id);
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if (it_browser == browser_info_map_.end()) {
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// No InfoMap exists for the browser ID so create it.
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info_map = new InfoMap;
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browser_info_map_.insert(std::make_pair(browser_id, info_map));
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} else {
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info_map = it_browser->second;
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// The specified ID should not already exist in the map.
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DCHECK(info_map->find(info_id) == info_map->end());
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}
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info_map->insert(std::make_pair(info_id, info));
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}
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// Find the object with the specified ID values. |visitor| can optionally be
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// used to evaluate or remove the object at the same time. If the object is
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// removed using the Visitor the caller is responsible for destroying it.
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ObjectType Find(int browser_id, IdType info_id, Visitor* vistor) {
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if (browser_info_map_.empty())
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return ObjectType();
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typename BrowserInfoMap::iterator it_browser =
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browser_info_map_.find(browser_id);
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if (it_browser == browser_info_map_.end())
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return ObjectType();
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InfoMap* info_map = it_browser->second;
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typename InfoMap::iterator it_info = info_map->find(info_id);
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if (it_info == info_map->end())
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return ObjectType();
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ObjectType info = it_info->second;
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bool remove = false;
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if (vistor)
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vistor->OnNextInfo(browser_id, it_info->first, info, &remove);
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if (remove) {
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info_map->erase(it_info);
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if (info_map->empty()) {
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// No more entries in the InfoMap so remove it.
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browser_info_map_.erase(it_browser);
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delete info_map;
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}
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}
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return info;
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}
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// Find all objects. If any objects are removed using the Visitor the caller
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// is responsible for destroying them.
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void FindAll(Visitor* visitor) {
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DCHECK(visitor);
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if (browser_info_map_.empty())
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return;
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bool remove, keepgoing = true;
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typename BrowserInfoMap::iterator it_browser = browser_info_map_.begin();
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while (it_browser != browser_info_map_.end()) {
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InfoMap* info_map = it_browser->second;
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typename InfoMap::iterator it_info = info_map->begin();
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while (it_info != info_map->end()) {
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remove = false;
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keepgoing = visitor->OnNextInfo(it_browser->first, it_info->first,
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it_info->second, &remove);
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if (remove)
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info_map->erase(it_info++);
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else
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++it_info;
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if (!keepgoing)
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break;
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}
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if (info_map->empty()) {
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// No more entries in the InfoMap so remove it.
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browser_info_map_.erase(it_browser++);
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delete info_map;
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} else {
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++it_browser;
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}
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if (!keepgoing)
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break;
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}
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}
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// Find all objects associated with the specified browser. If any objects are
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// removed using the Visitor the caller is responsible for destroying them.
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void FindAll(int browser_id, Visitor* visitor) {
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DCHECK(visitor);
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if (browser_info_map_.empty())
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return;
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typename BrowserInfoMap::iterator it_browser =
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browser_info_map_.find(browser_id);
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if (it_browser == browser_info_map_.end())
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return;
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InfoMap* info_map = it_browser->second;
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bool remove, keepgoing;
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typename InfoMap::iterator it_info = info_map->begin();
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while (it_info != info_map->end()) {
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remove = false;
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keepgoing = visitor->OnNextInfo(browser_id, it_info->first,
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it_info->second, &remove);
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if (remove)
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info_map->erase(it_info++);
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else
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++it_info;
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if (!keepgoing)
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break;
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}
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if (info_map->empty()) {
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// No more entries in the InfoMap so remove it.
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browser_info_map_.erase(it_browser);
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delete info_map;
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}
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}
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// Returns true if the map is empty.
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bool empty() const { return browser_info_map_.empty(); }
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// Returns the number of objects in the map.
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size_t size() const {
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if (browser_info_map_.empty())
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return 0;
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size_t size = 0;
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typename BrowserInfoMap::const_iterator it_browser =
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browser_info_map_.begin();
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for (; it_browser != browser_info_map_.end(); ++it_browser)
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size += it_browser->second->size();
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return size;
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}
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// Returns the number of objects in the map that are associated with the
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// specified browser.
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size_t size(int browser_id) const {
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if (browser_info_map_.empty())
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return 0;
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typename BrowserInfoMap::const_iterator it_browser =
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browser_info_map_.find(browser_id);
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if (it_browser != browser_info_map_.end())
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return it_browser->second->size();
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return 0;
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}
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// Remove all objects from the map. The objects will be destructed.
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void clear() {
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if (browser_info_map_.empty())
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return;
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typename BrowserInfoMap::const_iterator it_browser =
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browser_info_map_.begin();
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for (; it_browser != browser_info_map_.end(); ++it_browser) {
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InfoMap* info_map = it_browser->second;
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typename InfoMap::const_iterator it_info = info_map->begin();
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for (; it_info != info_map->end(); ++it_info)
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Traits::Destruct(it_info->second);
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delete info_map;
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}
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browser_info_map_.clear();
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}
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// Remove all objects from the map that are associated with the specified
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// browser. The objects will be destructed.
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void clear(int browser_id) {
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if (browser_info_map_.empty())
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return;
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typename BrowserInfoMap::iterator it_browser =
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browser_info_map_.find(browser_id);
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if (it_browser == browser_info_map_.end())
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return;
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InfoMap* info_map = it_browser->second;
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typename InfoMap::const_iterator it_info = info_map->begin();
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for (; it_info != info_map->end(); ++it_info)
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Traits::Destruct(it_info->second);
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browser_info_map_.erase(it_browser);
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delete info_map;
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}
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private:
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// Map IdType to ObjectType instance.
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typedef std::map<IdType, ObjectType> InfoMap;
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// Map browser ID to InfoMap instance.
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typedef std::map<int, InfoMap*> BrowserInfoMap;
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BrowserInfoMap browser_info_map_;
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DISALLOW_COPY_AND_ASSIGN(CefBrowserInfoMap);
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};
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#endif // CEF_LIBCEF_DLL_WRAPPER_CEF_BROWSER_INFO_MAP_H_
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