AAPT2: Add a APK filtering.

Allow resource files to be removed from the final artifact based on the
density and locale configuration in the config file. The APK is split
along the density, locale and ABI axis. Each split is generated from the
original APK without modifying the original. The new resource table is
written back to the file system with unneeded assets etc removed.

Test: Unit tests
Test: Manually run optimize command against an APK and inspect results
Test: Installed split searchlite APK (after resigning) and ran on N6

Change-Id: If73597dcfd88c02d2616518585d0e25a5c6a84d1

1 files changed, 30 insertions, 0 deletions

diff --git a/tools/aapt2/ResourceTable.cpp b/tools/aapt2/ResourceTable.cpp
index ab59560d33a3..0304e21698df 100644
--- a/tools/aapt2/ResourceTable.cpp
+++ b/tools/aapt2/ResourceTable.cpp
@@ -546,4 +546,34 @@ Maybe<ResourceTable::SearchResult> ResourceTable::FindResource(const ResourceNam
   return SearchResult{package, type, entry};
 }
 
+std::unique_ptr<ResourceTable> ResourceTable::Clone() const {
+  std::unique_ptr<ResourceTable> new_table = util::make_unique<ResourceTable>();
+  for (const auto& pkg : packages) {
+    ResourceTablePackage* new_pkg = new_table->CreatePackage(pkg->name, pkg->id);
+    for (const auto& type : pkg->types) {
+      ResourceTableType* new_type = new_pkg->FindOrCreateType(type->type);
+      if (!new_type->id) {
+        new_type->id = type->id;
+        new_type->symbol_status = type->symbol_status;
+      }
+
+      for (const auto& entry : type->entries) {
+        ResourceEntry* new_entry = new_type->FindOrCreateEntry(entry->name);
+        if (!new_entry->id) {
+          new_entry->id = entry->id;
+          new_entry->symbol_status = entry->symbol_status;
+        }
+
+        for (const auto& config_value : entry->values) {
+          ResourceConfigValue* new_value =
+              new_entry->FindOrCreateValue(config_value->config, config_value->product);
+          Value* value = config_value->value->Clone(&new_table->string_pool);
+          new_value->value = std::unique_ptr<Value>(value);
+        }
+      }
+    }
+  }
+  return new_table;
+}
+
 }  // namespace aapt