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// Copyright (c) 2010 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/geolocation/location_provider.h"
#include "base/logging.h"
LocationProviderBase::LocationProviderBase() {
}
LocationProviderBase::~LocationProviderBase() {
DCHECK(CalledOnValidThread());
}
void LocationProviderBase::RegisterListener(ListenerInterface* listener) {
DCHECK(CalledOnValidThread());
DCHECK(listener);
std::pair<ListenerMap::iterator, bool> result =
listeners_.insert(std::make_pair(listener, 0));
DCHECK(result.first != listeners_.end());
int& ref_count = result.first->second;
const bool& is_new = result.second;
++ref_count;
// Check the post condition...
if (is_new) {
DCHECK(ref_count == 1);
} else {
DCHECK(ref_count > 1);
}
}
void LocationProviderBase::UnregisterListener(ListenerInterface *listener) {
DCHECK(CalledOnValidThread());
DCHECK(listener);
ListenerMap::iterator iter = listeners_.find(listener);
if (iter != listeners_.end()) {
if (--iter->second == 0) {
listeners_.erase(iter);
}
}
}
bool LocationProviderBase::has_listeners() const {
return !listeners_.empty();
}
void LocationProviderBase::UpdateListeners() {
DCHECK(CalledOnValidThread());
for (ListenerMap::const_iterator iter = listeners_.begin();
iter != listeners_.end();
++iter) {
iter->first->LocationUpdateAvailable(this);
}
}
// Currently only Linux has a GPS provider.
#if !defined(OS_LINUX)
LocationProviderBase* NewGpsLocationProvider() {
return NULL;
}
#endif
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