Attribute.hpp

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#pragma once
 
#include "AstGlobal.h"
#include "AstUtil/Property.hpp"
#include "AstUtil/SharedPtr.hpp"
#include "AstUtil/WeakPtr.hpp"
#include "AstUtil/Object.hpp"
 
AST_NAMESPACE_BEGIN
 
template<typename ObjectType>
struct object_ptr_holder
{
    typedef ObjectType* type;
};
 
template<>
struct object_ptr_holder<Object>
{
    typedef WeakPtr<Object> type;
};
 
 
class Property;
class Object;
template<typename ObjectType=Object, typename PropertyType=Property>
class AttributeBasic
{
public:
    typedef ObjectType object_type;
    typedef PropertyType property_type;
    typedef typename object_ptr_holder<object_type>::type object_ptr_holder_type;
 
    AttributeBasic() = default;
    
    AttributeBasic(ObjectType* object, PropertyType* property)
        : object_(object)
        , property_(property)
    {
    }
    
    bool isValid() const {return object_ && property_;}
 
    object_type* object() const { return getObject(); }
 
    property_type* property() const { return property_; }
    
    EValueType getValueType() const {
        if(!property_) return EValueType::eInvalid;
        return property_->getValueType();
    }
 
    errc_t getValueDouble(double& value) const
    {
        auto object = getObject();
        if(!property_ || !object) return eErrorInvalidParam;
        return property_->getValueDouble(object, value);
    }
    errc_t setValueDouble(double value)
    {
        auto object = getObject();
        if(!property_ || !object) return eErrorInvalidParam;
        return property_->setValueDouble(object, value);
    }
    errc_t getValueInt(int& value) const
    {
        auto object = getObject();
        if(!property_ || !object) return eErrorInvalidParam;
        return property_->getValueInt(object, value);
    }
    errc_t setValueInt(int value)
    {
        auto object = getObject();
        if(!property_ || !object) return eErrorInvalidParam;
        return property_->setValueInt(object, value);
    }
    errc_t getValueBool(bool& value) const
    {
        auto object = getObject();
        if(!property_ || !object) return eErrorInvalidParam;
        return property_->getValueBool(object, value);
    }
    errc_t setValueBool(bool value)
    {
        auto object = getObject();
        if(!property_ || !object) return eErrorInvalidParam;
        return property_->setValueBool(object, value);
    }
    errc_t getValueString(std::string& value) const
    {
        auto object = getObject();  
        if(!property_ || !object) return eErrorInvalidParam;
        return property_->getValueString(object, value);
    }
    errc_t setValueString(StringView value)
    {
        auto object = getObject();
        if(!property_ || !object) return eErrorInvalidParam;
        return property_->setValueString(object, value);
    }
    errc_t getValueObject(Object*& value) const
    {
        auto object = getObject();
        if(!property_ || !object) return eErrorInvalidParam;
        return property_->getValueObject(object, value);
    }
    errc_t setValueObject(Object* value)
    {
        auto object = getObject();
        if(!property_ || !object) return eErrorInvalidParam;
        return property_->setValueObject(object, value);
    }
public:
    double getValueDouble() const
    {
        double value = 0.0;
        getValueDouble(value);
        return value;
    }
    int getValueInt() const
    {
        int value = 0;
        getValueInt(value);
        return value;
    }
    bool getValueBool() const
    {
        bool value = false;
        getValueBool(value);
        return value;
    }
    std::string getValueString() const
    {
        std::string value;
        getValueString(value);
        return value;
    }
    Object* getValueObject() const
    {
        Object* value = nullptr;
        getValueObject(value);
        return value;
    }
public:
    operator double() const
    {
        return getValueDouble();
    }
    operator int() const
    {
        return getValueInt();
    }
    operator bool() const
    {
        return getValueBool();
    }
    operator std::string() const
    {
        return getValueString();
    }
public:
    AttributeBasic& operator=(double value)
    {
        setValueDouble(value);
        return *this;
    }
    AttributeBasic& operator=(int value)
    {
        setValueInt(value);
        return *this;
    }
    // 避免对bool类型的隐式转换
    template<typename T, typename = typename std::enable_if<std::is_same<T, bool>::value>::type>
    AttributeBasic& operator=(T value)
    {
        setValueBool(value);
        return *this;
    }
    AttributeBasic& operator=(StringView value)
    {
        setValueString(value);
        return *this;
    }
protected:
    object_type* getObject() const;
protected:
    object_ptr_holder_type object_{};
    property_type* property_{nullptr};
};
 
template<>
inline typename AttributeBasic<Object, Property>::object_type* 
AttributeBasic<Object, Property>::getObject() const
{
    return object_.get();
}
 
template<typename ObjectPtrType, typename PropertyType>
inline typename AttributeBasic<ObjectPtrType, PropertyType>::object_type* 
AttributeBasic<ObjectPtrType, PropertyType>::getObject() const
{
    return object_;
}
 
// typedef AttributeBasic<> Attribute;
 
AST_NAMESPACE_END