1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef AAPT_RESOURCE_TABLE_RESOLVER_H
18 #define AAPT_RESOURCE_TABLE_RESOLVER_H
19 
20 #include "Maybe.h"
21 #include "Resolver.h"
22 #include "Resource.h"
23 #include "ResourceTable.h"
24 #include "ResourceValues.h"
25 
26 #include <androidfw/AssetManager.h>
27 #include <memory>
28 #include <vector>
29 #include <unordered_set>
30 
31 namespace aapt {
32 
33 /**
34  * Encapsulates the search of library sources as well as the local ResourceTable.
35  */
36 class ResourceTableResolver : public IResolver {
37 public:
38     /**
39      * Creates a resolver with a local ResourceTable and an AssetManager
40      * loaded with library packages.
41      */
42     ResourceTableResolver(
43             std::shared_ptr<const ResourceTable> table,
44             const std::vector<std::shared_ptr<const android::AssetManager>>& sources);
45 
46     ResourceTableResolver(const ResourceTableResolver&) = delete; // Not copyable.
47 
48     virtual Maybe<ResourceId> findId(const ResourceName& name) override;
49 
50     virtual Maybe<Entry> findAttribute(const ResourceName& name) override;
51 
52     virtual Maybe<ResourceName> findName(ResourceId resId) override;
53 
54 private:
55     struct CacheEntry {
56         ResourceId id;
57         std::unique_ptr<Attribute> attr;
58     };
59 
60     const CacheEntry* buildCacheEntry(const ResourceName& name);
61 
62     std::shared_ptr<const ResourceTable> mTable;
63     std::vector<std::shared_ptr<const android::AssetManager>> mSources;
64     std::map<ResourceName, CacheEntry> mCache;
65     std::unordered_set<std::u16string> mIncludedPackages;
66 };
67 
68 } // namespace aapt
69 
70 #endif // AAPT_RESOURCE_TABLE_RESOLVER_H
71