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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.
*/
#ifndef AAPT_PROCESS_SYMBOLTABLE_H
#define AAPT_PROCESS_SYMBOLTABLE_H
#include "Resource.h"
#include "ResourceTable.h"
#include "ResourceValues.h"
#include "util/Util.h"
#include <utils/JenkinsHash.h>
#include <utils/LruCache.h>
#include <android-base/macros.h>
#include <androidfw/AssetManager.h>
#include <algorithm>
#include <memory>
#include <vector>
namespace aapt {
inline android::hash_t hash_type(const ResourceName& name) {
std::hash<std::u16string> strHash;
android::hash_t hash = 0;
hash = android::JenkinsHashMix(hash, (uint32_t) strHash(name.package));
hash = android::JenkinsHashMix(hash, (uint32_t) name.type);
hash = android::JenkinsHashMix(hash, (uint32_t) strHash(name.entry));
return hash;
}
inline android::hash_t hash_type(const ResourceId& id) {
return android::hash_type(id.id);
}
class ISymbolSource;
class SymbolTable {
public:
struct Symbol {
Symbol() : Symbol(Maybe<ResourceId>{}) {
}
Symbol(const Maybe<ResourceId>& i) : Symbol(i, nullptr) {
}
Symbol(const Maybe<ResourceId>& i, const std::shared_ptr<Attribute>& attr) :
Symbol(i, attr, false) {
}
Symbol(const Maybe<ResourceId>& i, const std::shared_ptr<Attribute>& attr, bool pub) :
id(i), attribute(attr), isPublic(pub) {
}
Symbol(const Symbol&) = default;
Symbol(Symbol&&) = default;
Symbol& operator=(const Symbol&) = default;
Symbol& operator=(Symbol&&) = default;
Maybe<ResourceId> id;
std::shared_ptr<Attribute> attribute;
bool isPublic = false;
};
SymbolTable() : mCache(200), mIdCache(200) {
}
void appendSource(std::unique_ptr<ISymbolSource> source);
void prependSource(std::unique_ptr<ISymbolSource> source);
/**
* Never hold on to the result between calls to findByName or findById. The results
* are typically stored in a cache which may evict entries.
*/
const Symbol* findByName(const ResourceName& name);
const Symbol* findById(ResourceId id);
/**
* Let's the ISymbolSource decide whether looking up by name or ID is faster, if both
* are available.
*/
const Symbol* findByReference(const Reference& ref);
private:
std::vector<std::unique_ptr<ISymbolSource>> mSources;
// We use shared_ptr because unique_ptr is not supported and
// we need automatic deletion.
android::LruCache<ResourceName, std::shared_ptr<Symbol>> mCache;
android::LruCache<ResourceId, std::shared_ptr<Symbol>> mIdCache;
DISALLOW_COPY_AND_ASSIGN(SymbolTable);
};
/**
* An interface that a symbol source implements in order to surface symbol information
* to the symbol table.
*/
class ISymbolSource {
public:
virtual ~ISymbolSource() = default;
virtual std::unique_ptr<SymbolTable::Symbol> findByName(const ResourceName& name) = 0;
virtual std::unique_ptr<SymbolTable::Symbol> findById(ResourceId id) = 0;
/**
* Default implementation tries the name if it exists, else the ID.
*/
virtual std::unique_ptr<SymbolTable::Symbol> findByReference(const Reference& ref) {
if (ref.name) {
return findByName(ref.name.value());
} else if (ref.id) {
return findById(ref.id.value());
}
return {};
}
};
/**
* Exposes the resources in a ResourceTable as symbols for SymbolTable.
* Instances of this class must outlive the encompassed ResourceTable.
* Lookups by ID are ignored.
*/
class ResourceTableSymbolSource : public ISymbolSource {
public:
explicit ResourceTableSymbolSource(ResourceTable* table) : mTable(table) {
}
std::unique_ptr<SymbolTable::Symbol> findByName(const ResourceName& name) override;
std::unique_ptr<SymbolTable::Symbol> findById(ResourceId id) override {
return {};
}
private:
ResourceTable* mTable;
DISALLOW_COPY_AND_ASSIGN(ResourceTableSymbolSource);
};
class AssetManagerSymbolSource : public ISymbolSource {
public:
AssetManagerSymbolSource() = default;
bool addAssetPath(const StringPiece& path);
std::unique_ptr<SymbolTable::Symbol> findByName(const ResourceName& name) override;
std::unique_ptr<SymbolTable::Symbol> findById(ResourceId id) override;
std::unique_ptr<SymbolTable::Symbol> findByReference(const Reference& ref) override;
private:
android::AssetManager mAssets;
DISALLOW_COPY_AND_ASSIGN(AssetManagerSymbolSource);
};
} // namespace aapt
#endif /* AAPT_PROCESS_SYMBOLTABLE_H */
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