1 /*
2  * Copyright (c) 2024 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef META_SRC_LOADERS_CSV_STRING_RESOURCE_LOADER_H
17 #define META_SRC_LOADERS_CSV_STRING_RESOURCE_LOADER_H
18 
19 #include <base/containers/unordered_map.h>
20 
21 #include <meta/api/property/property_event_handler.h>
22 #include <meta/ext/event_impl.h>
23 #include <meta/ext/object.h>
24 #include <meta/interface/builtin_objects.h>
25 #include <meta/interface/loaders/intf_file_content_loader.h>
26 
27 META_BEGIN_NAMESPACE()
28 
29 class CsvStringResourceLoader final : public META_NS::ObjectFwd<CsvStringResourceLoader,
30                                           ClassId::CsvStringResourceLoader, ClassId::Object, IFileContentLoader> {
31     META_IMPLEMENT_INTERFACE_PROPERTY(IFileContentLoader, bool, Cached)
32 public:
33     bool Build(const IMetadata::Ptr& data) override;
34 
35 public: // IDynamicContentLoader
36     META_IMPLEMENT_INTERFACE_EVENT(IDynamicContentLoader, IOnChanged, ContentChanged)
37     void Reload() override;
38 
39 public: // IFileContentLoader
40     bool SetFile(CORE_NS::IFile::Ptr file) override;
41     IObject::Ptr Create(const IObject::Ptr& params) override;
42 
43 private:
44     static constexpr const BASE_NS::string_view KEY_HEADER_COLUMN = "key";
45     static constexpr const BASE_NS::string_view TARGET_PROPERTY_NAME = "strings";
46 
47     struct ResourceObjectOptions {
48         BASE_NS::string keyHeaderColumnName { KEY_HEADER_COLUMN };
49         BASE_NS::string targetPropertyName { CsvStringResourceLoader::TARGET_PROPERTY_NAME };
50         bool keysToLower { true };
51     };
52 
53     using CsvContentItemType = BASE_NS::pair<BASE_NS::string, BASE_NS::vector<BASE_NS::string>>;
54     using CsvContentType = BASE_NS::vector<CsvContentItemType>;
55 
56     void Reset();
57     IObject::Ptr CreateStringResourceObject(const CsvContentType& content, const ResourceObjectOptions& options);
58     CsvContentType ParseCsv(BASE_NS::string_view csv, const ResourceObjectOptions& options);
59 
60     CORE_NS::IFile::Ptr file_;
61     CsvContentType cachedContent_;
62 };
63 
64 META_END_NAMESPACE()
65 
66 #endif
67