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_JSON_CONTENT_LOADER_H
17 #define META_SRC_LOADERS_JSON_CONTENT_LOADER_H
18 
19 #include <meta/api/property/property_event_handler.h>
20 #include <meta/ext/object.h>
21 #include <meta/interface/builtin_objects.h>
22 #include <meta/interface/loaders/intf_file_content_loader.h>
23 #include <meta/interface/serialization/intf_ser_node.h>
24 
25 META_BEGIN_NAMESPACE()
26 
27 class JsonContentLoader final
28     : public ObjectFwd<JsonContentLoader, ClassId::JsonContentLoader, ClassId::Object, IFileContentLoader> {
29     META_IMPLEMENT_INTERFACE_PROPERTY(IFileContentLoader, bool, Cached)
30 public:
31     bool Build(const IMetadata::Ptr& data) override;
32 
33 public: // IDynamicContentLoader
34     META_IMPLEMENT_INTERFACE_EVENT(IDynamicContentLoader, IOnChanged, ContentChanged)
35     void Reload() override;
36 
37 public: // IFileContentLoader
38     bool SetFile(CORE_NS::IFile::Ptr file) override;
39     IObject::Ptr Create(const IObject::Ptr& params) override;
40 
41 private:
42     IObject::Ptr LoadCached();
43     bool UpdateTree();
44 
45 private:
46     CORE_NS::IFile::Ptr file_;
47     PropertyChangedEventHandler cachedChangedHandler_;
48     ISerNode::Ptr tree_;
49 };
50 
51 META_END_NAMESPACE()
52 
53 #endif
54