Scaffolding for an experimental discovery API letting users inject links in the recommended pane of…

chrome/browser/extensions/extension_suggested_links_manager.cc

Index: chrome/browser/extensions/extension_suggested_links_manager.cc
diff --git a/chrome/browser/extensions/extension_suggested_links_manager.cc b/chrome/browser/extensions/extension_suggested_links_manager.cc
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+++ b/chrome/browser/extensions/extension_suggested_links_manager.cc
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+// 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 "chrome/browser/extensions/extension_suggested_links_manager.h"
+
+#include <algorithm>
+
+using content::BrowserThread;
+
+namespace {
+
+// A functor that mathes an ExtensionSuggestedLink having a given URL. Needs an
+// implicit copy constructor to be used with std::find.
+class ExtensionSuggestedLinkMatchUrlPred {
+ public:
+  explicit ExtensionSuggestedLinkMatchUrlPred(const std::string* link_url) :
+      link_url_(link_url) {}
+
+  bool operator() (linked_ptr<ExtensionSuggestedLink> suggested_link) const {
+    return suggested_link->link_url().compare(*link_url_) == 0;
+  }
+
+ private:
+  const std::string* link_url_;
+};
+
+void RemoveLinkFromList(const std::string& link_url,
+    ExtensionSuggestedLinkList* list) {
+  ExtensionSuggestedLinkMatchUrlPred pred(&link_url);
+  ExtensionSuggestedLinkList::iterator found = std::find_if(list->begin(),
+      list->end(), pred);
+  if (found != list->end())
+    list->erase(found);
+}
+
+}
+
+ExtensionSuggestedLinksManager::ExtensionSuggestedLinksManager() {}
+
+ExtensionSuggestedLinksManager::~ExtensionSuggestedLinksManager() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+}
+
+void ExtensionSuggestedLinksManager::Add(const std::string& extension_id,
+    ExtensionSuggestedLink* item) {
+  // Do this first since we own the incoming item and hence want to delete
+  // it in error paths.
+  linked_ptr<ExtensionSuggestedLink> linked_item(item);
+
+  ExtensionSuggestedLinkList& list = GetAllInternal(extension_id);
+  list.push_back(linked_item);
+}
+
+const ExtensionSuggestedLinkList* ExtensionSuggestedLinksManager::GetAll(
+    const std::string& extension_id) const {
+  SuggestedLinksMap::const_iterator found = suggested_links_.find(extension_id);
+  if (found != suggested_links_.end())
+    return &found->second;
+  return NULL;
+}
+
+void ExtensionSuggestedLinksManager::Clear(const std::string& extension_id,
+    const std::string& link_url) {
+  SuggestedLinksMap::iterator found = suggested_links_.find(extension_id);
+  if (found != suggested_links_.end())
+    RemoveLinkFromList(link_url, &found->second);
+}
+
+void ExtensionSuggestedLinksManager::ClearAll(const std::string& extension_id) {
+  SuggestedLinksMap::iterator found = suggested_links_.find(extension_id);
+  if (found != suggested_links_.end())
+    suggested_links_.erase(found);
+}
+
+ExtensionSuggestedLinkList& ExtensionSuggestedLinksManager::GetAllInternal(
+    const std::string& extension_id) {
+  // |insert| returns the element if it's already in the map.
+  SuggestedLinksMap::iterator found = suggested_links_.insert(
+      SuggestedLinksMap::value_type(extension_id,
+          ExtensionSuggestedLinkList())).first;
+  CHECK(found != suggested_links_.end());
+  return found->second;
+}