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/*
* Copyright (C) 2015 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 "link/Linkers.h"
#include <algorithm>
#include "android-base/logging.h"
#include "ResourceTable.h"
#include "SdkConstants.h"
#include "ValueVisitor.h"
#include "trace/TraceBuffer.h"
using android::ConfigDescription;
namespace aapt {
bool ShouldGenerateVersionedResource(const ResourceEntry* entry,
const ConfigDescription& config,
const ApiVersion sdk_version_to_generate) {
// We assume the caller is trying to generate a version greater than the current configuration.
CHECK(sdk_version_to_generate > config.sdkVersion);
return sdk_version_to_generate < FindNextApiVersionForConfig(entry, config);
}
ApiVersion FindNextApiVersionForConfig(const ResourceEntry* entry,
const ConfigDescription& config) {
const auto end_iter = entry->values.end();
auto iter = entry->values.begin();
for (; iter != end_iter; ++iter) {
if ((*iter)->config == config) {
break;
}
}
// The source config came from this list, so it should be here.
CHECK(iter != entry->values.end());
++iter;
// The next configuration either only varies in sdkVersion, or it is completely different
// and therefore incompatible. If it is incompatible, we must generate the versioned resource.
// NOTE: The ordering of configurations takes sdkVersion as higher precedence than other
// qualifiers, so we need to iterate through the entire list to be sure there
// are no higher sdk level versions of this resource.
ConfigDescription temp_config(config);
for (; iter != end_iter; ++iter) {
temp_config.sdkVersion = (*iter)->config.sdkVersion;
if (temp_config == (*iter)->config) {
// The two configs are the same, return the sdkVersion.
return (*iter)->config.sdkVersion;
}
}
// Didn't find another config with a different sdk version, so return the highest possible value.
return std::numeric_limits<ApiVersion>::max();
}
bool AutoVersioner::Consume(IAaptContext* context, ResourceTable* table) {
TRACE_NAME("AutoVersioner::Consume");
for (auto& package : table->packages) {
for (auto& type : package->types) {
if (type->type != ResourceType::kStyle) {
continue;
}
for (auto& entry : type->entries) {
for (size_t i = 0; i < entry->values.size(); i++) {
ResourceConfigValue* config_value = entry->values[i].get();
if (config_value->config.sdkVersion >= SDK_LOLLIPOP_MR1) {
// If this configuration is only used on L-MR1 then we don't need
// to do anything since we use private attributes since that
// version.
continue;
}
if (Style* style = ValueCast<Style>(config_value->value.get())) {
Maybe<ApiVersion> min_sdk_stripped;
std::vector<Style::Entry> stripped;
auto iter = style->entries.begin();
while (iter != style->entries.end()) {
CHECK(bool(iter->key.id)) << "IDs must be assigned and linked";
// Find the SDK level that is higher than the configuration
// allows.
const ApiVersion sdk_level = FindAttributeSdkLevel(iter->key.id.value());
if (sdk_level > std::max<ApiVersion>(config_value->config.sdkVersion, 1)) {
// Record that we are about to strip this.
stripped.emplace_back(std::move(*iter));
// We use the smallest SDK level to generate the new style.
if (min_sdk_stripped) {
min_sdk_stripped = std::min(min_sdk_stripped.value(), sdk_level);
} else {
min_sdk_stripped = sdk_level;
}
// Erase this from this style.
iter = style->entries.erase(iter);
continue;
}
++iter;
}
if (min_sdk_stripped && !stripped.empty()) {
// We found attributes from a higher SDK level. Check that
// there is no other defined resource for the version we want to
// generate.
if (ShouldGenerateVersionedResource(entry.get(),
config_value->config,
min_sdk_stripped.value())) {
// Let's create a new Style for this versioned resource.
ConfigDescription new_config(config_value->config);
new_config.sdkVersion = static_cast<uint16_t>(min_sdk_stripped.value());
std::unique_ptr<Style> new_style(style->Clone(&table->string_pool));
new_style->SetComment(style->GetComment());
new_style->SetSource(style->GetSource());
// Move the previously stripped attributes into this style.
new_style->entries.insert(
new_style->entries.end(),
std::make_move_iterator(stripped.begin()),
std::make_move_iterator(stripped.end()));
// Insert the new Resource into the correct place.
entry->FindOrCreateValue(new_config, {})->value = std::move(new_style);
}
}
}
}
}
}
}
return true;
}
} // namespace aapt
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