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ESO Lua File v101038

libraries/utility/baseobject.lua

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local MUST_IMPLEMENT_SENTINEL = function()
    error(2, "Attempted to call unimplemented method!")
end
function ZO_VerifyClassImplementation(finalClass, classTraceback)
    -- detect any instances of ZO_MUST_IMPLEMENT that are not implemented.
    local function VisitClass(currentClass)
        for fieldName, fieldValue in pairs(currentClass) do
            if fieldValue == MUST_IMPLEMENT_SENTINEL and finalClass[fieldName] == MUST_IMPLEMENT_SENTINEL then
                local NO_STACK_TRACE = 0
                error("Class has unimplemented method: " .. fieldName .. "\n" .. classTraceback, NO_STACK_TRACE)
            end
        end
        if currentClass.__parentClasses then
            for _, parentClass in ipairs(currentClass.__parentClasses) do
                VisitClass(parentClass)
            end
        end
    end
    VisitClass(finalClass)
end
local SHOULD_VERIFY_CLASSES = GetCVar("EnableLuaClassVerification") == "1"
if SHOULD_VERIFY_CLASSES then
    local g_concreteClassSet = {}
    function RegisterConcreteClass(concreteClass, stackLevel)
        g_concreteClassSet[concreteClass] = debug.traceback(nil, stackLevel + 1)
    end
    function RemoveConcreteClass(concreteClass)
        g_concreteClassSet[concreteClass] = nil
    end
    function ZO_VerifyConcreteClasses()
        for concreteClass, classTraceback in pairs(g_concreteClassSet) do
            ZO_VerifyClassImplementation(concreteClass, classTraceback)
            g_concreteClassSet[concreteClass] = nil
        end
    end
    GetEventManager():RegisterForEvent("BaseObject", EVENT_ADD_ON_LOADED, function()
        ZO_VerifyConcreteClasses()
    end)
else
    -- do nothing instead of tracking and automatically verifying classes
    function RegisterConcreteClass()
    end
    function RemoveConcreteClass()
    end
    function ZO_VerifyConcreteClasses()
    end
end
ZO_Object = {}
ZO_Object.__index = ZO_Object
function ZO_Object:New(template)
    local class = template or self
    local newObject = setmetatable({}, class)
    return newObject
end
---
-- Call ZO_Object:Subclass() to create a new class that inherits from this one.
--
function ZO_Object:Subclass()
    local newClass = setmetatable({}, self)
    newClass.__index = newClass
    newClass.__parentClasses = { self }
    newClass.__isAbstractClass = false
    if self.__isAbstractClass then
        local PARENT_STACK = 2
        RegisterConcreteClass(newClass, PARENT_STACK) 
    end
    return newClass
end
---
-- Call ZO_Object:MultiSubclass() to create a new class that
-- inherits from multiple parent classes. In situations where the same method is
-- defined on multiple classes, the leftmost class in the argument list takes
-- priority. It is recommended that you override to avoid this!
--
function ZO_Object:MultiSubclass(...)
    local parentClasses = { self, ... }
    local newClass = setmetatable({}, {
        __index = function(table, key)
            for _, parentClassTable in ipairs(parentClasses) do
                local value = parentClassTable[key]
                if value ~= nil then
                    return value
                end
            end
        end
    })
    newClass.__index = newClass
    newClass.__parentClasses = parentClasses
    newClass.__isAbstractClass = false
    for _, parentClass in ipairs(parentClasses) do
        if parentClass.__isAbstractClass then
            local PARENT_STACK = 2
            RegisterConcreteClass(newClass, PARENT_STACK) 
            break
        end
    end
    return newClass
end
--- Use MUST_IMPLEMENT to create a field that must be implemented by
-- subclasses. If a concrete class does not implement a field that contains a
-- MUST_IMPLEMENT, it will cause an error after the entire addon has been loaded.
-- Example A: ZO_MyAbstractClass.MyAbstractFunction = ZO_MyAbstractClass:MUST_IMPLEMENT()
-- Example B: ZO_MyAbstractClass:MUST_IMPLEMENT("MyAbstractFunction")
function ZO_Object:MUST_IMPLEMENT(fieldName)
    self.__isAbstractClass = true
    if fieldName then
        self[fieldName] = MUST_IMPLEMENT_SENTINEL
    end
    return MUST_IMPLEMENT_SENTINEL
end
function ZO_Object:IsInstanceOf(checkClass)
    local function VisitClass(currentClass)
        if currentClass == checkClass then
            return true
        end
        if currentClass.__parentClasses then
            for _, parentClass in ipairs(currentClass.__parentClasses) do
                if VisitClass(parentClass) then
                    return true
                end
            end
        end
        return false
    end
    return VisitClass(self.__index)
end
--[[
Here is a simple multiple inheritence example:
local A = ZO_Object:Subclass()
function A:InitializeA()
self.name = "A"
end
local B = ZO_Object:Subclass()
function B:InitializeB()
self.text = "B"
end
C = ZO_Object.MultiSubclass(A, B)
function C:New()
local obj = ZO_Object.New(self)
obj:Initialize()
return obj
end
function C:Initialize()
self:InitializeA()
self:InitializeB()
end
]]
--
    return function(tbl, key)
        local value = template[key]
        if value == nil then
            local dataSource = rawget(tbl, "dataSource")
            if dataSource then
                value = dataSource[key]
            end
        end
        return value
    end
end
ZO_DataSourceObject = {}
function ZO_DataSourceObject:New(template)
    template = template or self
    local newObject = setmetatable({}, template.instanceMetaTable)
    local mt = getmetatable(newObject)
    return newObject
end
function ZO_DataSourceObject:GetDataSource()
    return self.dataSource
end
function ZO_DataSourceObject:SetDataSource(dataSource)
    self.dataSource = dataSource
end
function ZO_DataSourceObject:Subclass()
    local newTemplate = setmetatable({}, { __index = self })
    newTemplate.instanceMetaTable = { __index = ZO_GenerateDataSourceMetaTableIndexFunction(newTemplate) }
    newTemplate.__parentClasses = { self }
    newTemplate.__isAbstractClass = false
    return newTemplate
end
---
-- ZO_InitializingObject is a new Object definition that more directly encodes
-- the practices most current ZO_Objects are actually using. in most cases, you
-- can directly replace a ZO_Object with a ZO_InitializingObject, and delete the
-- redundant :New() definition that most ZO_Object classes create.
--
ZO_InitializingObject = {}
zo_mixin(ZO_InitializingObject, ZO_Object)
ZO_InitializingObject.__index = ZO_InitializingObject
---
-- This is the external constructor for each object. should be called like so:
-- myObject = MyClass:New([arguments])
--
function ZO_InitializingObject:New(...)
    local newObject = setmetatable({}, self)
    newObject:Initialize(...)
    return newObject
end
---
-- Override this initialization function to define how your object should be constructed. example:
-- function MyClass:Initialize(argument1, argument2)
-- self.myField = argument1
-- end
-- You can still create an InitializingObject that doesn't have an Initialize
-- definition, it will just call this empty method instead.
function ZO_InitializingObject:Initialize()
    -- To be overridden
end