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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/event_listener_map.h"
#include "base/values.h"
#include "chrome/browser/extensions/event_router.h"
namespace extensions {
typedef EventFilter::MatcherID MatcherID;
EventListener::EventListener(const std::string& event_name,
const std::string& extension_id,
content::RenderProcessHost* process,
scoped_ptr<DictionaryValue> filter)
: event_name(event_name),
extension_id(extension_id),
process(process),
filter(filter.Pass()),
matcher_id(-1) {}
EventListener::~EventListener() {}
bool EventListener::Equals(const EventListener* other) const {
// We don't check matcher_id equality because we want a listener with a
// filter that hasn't been added to EventFilter to match one that is
// equivalent but has.
return event_name == other->event_name &&
extension_id == other->extension_id &&
process == other->process &&
((!!filter.get()) == (!!other->filter.get())) &&
(!filter.get() || filter->Equals(other->filter.get()));
}
scoped_ptr<EventListener> EventListener::Copy() const {
scoped_ptr<DictionaryValue> filter_copy;
if (filter.get())
filter_copy.reset(filter->DeepCopy());
return scoped_ptr<EventListener>(new EventListener(event_name, extension_id,
process,
filter_copy.Pass()));
}
EventListenerMap::EventListenerMap(Delegate* delegate)
: delegate_(delegate) {
}
EventListenerMap::~EventListenerMap() {}
bool EventListenerMap::AddListener(scoped_ptr<EventListener> listener) {
if (HasListener(listener.get()))
return false;
if (listener->filter.get()) {
scoped_ptr<EventMatcher> matcher(ParseEventMatcher(listener->filter.get()));
MatcherID id = event_filter_.AddEventMatcher(listener->event_name,
matcher.Pass());
listener->matcher_id = id;
listeners_by_matcher_id_[id] = listener.get();
filtered_events_.insert(listener->event_name);
}
linked_ptr<EventListener> listener_ptr(listener.release());
listeners_[listener_ptr->event_name].push_back(listener_ptr);
delegate_->OnListenerAdded(listener_ptr.get());
return true;
}
scoped_ptr<EventMatcher> EventListenerMap::ParseEventMatcher(
DictionaryValue* filter_dict) {
return scoped_ptr<EventMatcher>(new EventMatcher(
scoped_ptr<DictionaryValue>(filter_dict->DeepCopy())));
}
bool EventListenerMap::RemoveListener(const EventListener* listener) {
ListenerList& listeners = listeners_[listener->event_name];
for (ListenerList::iterator it = listeners.begin(); it != listeners.end();
it++) {
if ((*it)->Equals(listener)) {
delegate_->OnListenerRemoved(it->get());
CleanupListener(it->get());
// Popping from the back should be cheaper than erase(it).
std::swap(*it, listeners.back());
listeners.pop_back();
return true;
}
}
return false;
}
bool EventListenerMap::HasListenerForEvent(const std::string& event_name) {
ListenerMap::iterator it = listeners_.find(event_name);
return it != listeners_.end() && !it->second.empty();
}
bool EventListenerMap::HasListenerForExtension(
const std::string& extension_id,
const std::string& event_name) {
ListenerMap::iterator it = listeners_.find(event_name);
if (it == listeners_.end())
return false;
for (ListenerList::iterator it2 = it->second.begin();
it2 != it->second.end(); it2++) {
if ((*it2)->extension_id == extension_id)
return true;
}
return false;
}
bool EventListenerMap::HasListener(const EventListener* listener) {
ListenerMap::iterator it = listeners_.find(listener->event_name);
if (it == listeners_.end())
return false;
for (ListenerList::iterator it2 = it->second.begin();
it2 != it->second.end(); it2++) {
if ((*it2)->Equals(listener)) {
return true;
}
}
return false;
}
bool EventListenerMap::HasProcessListener(content::RenderProcessHost* process,
const std::string& extension_id) {
for (ListenerMap::iterator it = listeners_.begin(); it != listeners_.end();
it++) {
for (ListenerList::iterator it2 = it->second.begin();
it2 != it->second.end(); it2++) {
if ((*it2)->process == process && (*it2)->extension_id == extension_id)
return true;
}
}
return false;
}
void EventListenerMap::RemoveLazyListenersForExtension(
const std::string& extension_id) {
for (ListenerMap::iterator it = listeners_.begin(); it != listeners_.end();
it++) {
for (ListenerList::iterator it2 = it->second.begin();
it2 != it->second.end();) {
if (!(*it2)->process && (*it2)->extension_id == extension_id) {
CleanupListener(it2->get());
it2 = it->second.erase(it2);
} else {
it2++;
}
}
}
}
void EventListenerMap::LoadUnfilteredLazyListeners(
const std::string& extension_id,
const std::set<std::string>& event_names) {
for (std::set<std::string>::const_iterator it = event_names.begin();
it != event_names.end(); ++it) {
AddListener(scoped_ptr<EventListener>(new EventListener(
*it, extension_id, NULL, scoped_ptr<DictionaryValue>())));
}
}
void EventListenerMap::LoadFilteredLazyListeners(
const std::string& extension_id,
const DictionaryValue& filtered) {
for (DictionaryValue::key_iterator it = filtered.begin_keys();
it != filtered.end_keys(); ++it) {
// We skip entries if they are malformed.
const ListValue* filter_list = NULL;
if (!filtered.GetListWithoutPathExpansion(*it, &filter_list))
continue;
for (size_t i = 0; i < filter_list->GetSize(); i++) {
DictionaryValue* filter = NULL;
if (!filter_list->GetDictionary(i, &filter))
continue;
AddListener(scoped_ptr<EventListener>(new EventListener(
*it, extension_id, NULL,
scoped_ptr<DictionaryValue>(filter->DeepCopy()))));
}
}
}
std::set<const EventListener*> EventListenerMap::GetEventListeners(
const Event& event) {
std::set<const EventListener*> interested_listeners;
if (IsFilteredEvent(event)) {
// Look up the interested listeners via the EventFilter.
std::set<MatcherID> ids =
event_filter_.MatchEvent(event.event_name, event.info);
for (std::set<MatcherID>::iterator id = ids.begin(); id != ids.end();
id++) {
EventListener* listener = listeners_by_matcher_id_[*id];
CHECK(listener);
interested_listeners.insert(listener);
}
} else {
ListenerList& listeners = listeners_[event.event_name];
for (ListenerList::const_iterator it = listeners.begin();
it != listeners.end(); it++) {
interested_listeners.insert(it->get());
}
}
return interested_listeners;
}
void EventListenerMap::RemoveListenersForProcess(
const content::RenderProcessHost* process) {
CHECK(process);
for (ListenerMap::iterator it = listeners_.begin(); it != listeners_.end();
it++) {
for (ListenerList::iterator it2 = it->second.begin();
it2 != it->second.end();) {
if ((*it2)->process == process) {
delegate_->OnListenerRemoved(it2->get());
CleanupListener(it2->get());
it2 = it->second.erase(it2);
} else {
it2++;
}
}
}
}
void EventListenerMap::CleanupListener(EventListener* listener) {
// If the listener doesn't have a filter then we have nothing to clean up.
if (listener->matcher_id == -1)
return;
event_filter_.RemoveEventMatcher(listener->matcher_id);
CHECK_EQ(1u, listeners_by_matcher_id_.erase(listener->matcher_id));
}
bool EventListenerMap::IsFilteredEvent(const Event& event) const {
return filtered_events_.count(event.event_name) > 0u;
}
} // namespace extensions
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