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/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "EmojiFactory.h"
#define LOG_TAG "EmojiFactory"
#include <utils/Log.h>
#include <utils/Vector.h>
#include <cutils/properties.h>
#include <dlfcn.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
namespace android {
static pthread_once_t g_once = PTHREAD_ONCE_INIT;
static Vector<EmojiFactory *> *g_factories = NULL;
static Vector<void *> *g_handles = NULL;
class EmojiFactoryManager {
public:
void Init();
virtual ~EmojiFactoryManager();
private:
void TryRegisterEmojiFactory(const char *library_name);
};
// Note: I previously did this procedure in the construcor. However,
// property_get() didn't return a correct value in that context. I guess
// property_get() does not return correct values before AndroidRuntime
// instance (or exactly, AppRuntime in instance app_main.cpp) is
// fully ready (see AndroidRunitem.cpp and app_main.cpp).
// So, instead of doing this in constructor, I decided this shoud be done
// when a user requires to EmojiFactory, which makes better sense to me.
void EmojiFactoryManager::Init() {
g_handles = new Vector<void *>();
g_factories = new Vector<EmojiFactory *>();
char *emoji_libraries = new char[PROPERTY_VALUE_MAX];
int len = property_get("ro.config.libemoji", emoji_libraries, "");
// ALOGD("ro.config.libemoji: %s", emoji_libraries);
if (len > 0) {
char *saveptr, *ptr;
ptr = emoji_libraries;
while (true) {
ptr = strtok_r(ptr, ":", &saveptr);
if (NULL == ptr) {
break;
}
TryRegisterEmojiFactory(ptr);
ptr = NULL;
}
}
delete [] emoji_libraries;
}
void EmojiFactoryManager::TryRegisterEmojiFactory(const char *library_name) {
void *handle = dlopen(library_name, RTLD_LAZY | RTLD_LOCAL);
if (handle == NULL) {
const char* error_str = dlerror();
if (error_str) {
error_str = "Unknown reason";
}
ALOGE("Failed to load shared library %s: %s", library_name, error_str);
return;
}
EmojiFactory *(*get_emoji_factory)() =
reinterpret_cast<EmojiFactory *(*)()>(dlsym(handle,
"GetEmojiFactory"));
if (get_emoji_factory == NULL) {
const char* error_str = dlerror();
if (error_str) {
error_str = "Unknown reason";
}
ALOGE("Failed to call GetEmojiFactory: %s", error_str);
dlclose(handle);
return;
}
EmojiFactory *factory = (*get_emoji_factory)();
if (NULL == factory) {
ALOGE("Returned factory is NULL");
dlclose(handle);
return;
}
const char *name = factory->Name();
size_t size = g_factories->size();
for (size_t i = 0; i < size; ++i) {
EmojiFactory *f = g_factories->itemAt(i);
if (!strcmp(name, f->Name())) {
ALOGE("Same EmojiFactory was found: %s", name);
delete factory;
dlclose(handle);
return;
}
}
g_factories->push(factory);
// dlclose() must not be called here, since returned factory may point to
// static data in the shared library (like "static const char* = "emoji";")
g_handles->push(handle);
}
EmojiFactoryManager::~EmojiFactoryManager() {
if (g_factories != NULL) {
size_t size = g_factories->size();
for (size_t i = 0; i < size; ++i) {
delete g_factories->itemAt(i);
}
delete g_factories;
}
if (g_handles != NULL) {
size_t size = g_handles->size();
for (size_t i = 0; i < size; ++i) {
dlclose(g_handles->itemAt(i));
}
delete g_handles;
}
}
static EmojiFactoryManager g_registrar;
static void InitializeEmojiFactory() {
g_registrar.Init();
}
/* static */
EmojiFactory *EmojiFactory::GetImplementation(const char *name) {
pthread_once(&g_once, InitializeEmojiFactory);
if (NULL == name) {
return NULL;
}
size_t size = g_factories->size();
for (size_t i = 0; i < size; ++i) {
EmojiFactory *factory = g_factories->itemAt(i);
if (!strcmp(name, factory->Name())) {
return factory;
}
}
return NULL;
}
/* static */
EmojiFactory *EmojiFactory::GetAvailableImplementation() {
pthread_once(&g_once, InitializeEmojiFactory);
size_t size = g_factories->size();
for (size_t i = 0; i < size; ++i) {
EmojiFactory *factory = g_factories->itemAt(i);
return factory;
}
return NULL;
}
} // namespace android
extern "C" android::EmojiFactory *GetImplementation(
const char *name) {
return android::EmojiFactory::GetImplementation(name);
}
extern "C" android::EmojiFactory *GetAvailableImplementation() {
return android::EmojiFactory::GetAvailableImplementation();
}
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