f29f525c77
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57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
// Copyright 2022-present 650 Industries. All rights reserved.
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#pragma once
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#ifdef __cplusplus
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#include <jsi/jsi.h>
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namespace jsi = facebook::jsi;
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namespace expo {
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/**
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A function that is responsible for initializing the backed object.
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*/
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typedef std::function<std::shared_ptr<jsi::Object>(jsi::Runtime &)> LazyObjectInitializer;
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/**
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A host object that defers the creating of the raw object until any property is accessed for the first time.
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*/
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class JSI_EXPORT LazyObject : public jsi::HostObject {
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public:
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using Shared = std::shared_ptr<LazyObject>;
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LazyObject(const LazyObjectInitializer initializer);
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virtual ~LazyObject();
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jsi::Value get(jsi::Runtime &, const jsi::PropNameID &name) override;
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void set(jsi::Runtime &, const jsi::PropNameID &name, const jsi::Value &value) override;
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std::vector<jsi::PropNameID> getPropertyNames(jsi::Runtime &rt) override;
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/**
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If the given object is a host object of type `LazyObject`, it returns its backed object.
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Otherwise, the given object is returned back.
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*/
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static const jsi::Object &unwrapObjectIfNecessary(jsi::Runtime &runtime, const jsi::Object &object);
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private:
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const LazyObjectInitializer initializer;
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std::shared_ptr<jsi::Object> backedObject;
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/**
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Initializes the backed object. It shouldn't be invoked more than once, so first make sure that `backedObject` is a null pointer.
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*/
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inline void initializeBackedObject(jsi::Runtime &runtime) {
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backedObject = initializer(runtime);
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}
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}; // class LazyObject
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} // namespace expo
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#endif // __cplusplus
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