How do objects like "PathNavigate" and many others persist across saves?

[MrChoke]

I'd like to understand more about how minecraft saves data.  I know there is NBT reads and writes but I don't think that is used for everything is it?  Let me use an example for my question.  On EntityLiving is this member:

 

protected PathNavigate navigator;

 

It holds a variable that I know persists across saves and reloads of the game:

protected Path currentPath;

 

So how is this data saved?  I don't see any NBT read/write code for it.  Does it do something like serialize and write the whole Entity object out to file? 

 

Any help to understand this would be great.

 

[Animefan8888]

  On 10/11/2018 at 12:04 AM, MrChoke said:

I know there is NBT reads and writes but I don't think that is used for everything is it?

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It is used to save everything, what logical thought process would lead a developer to create two different types of saving methods for one game?

 

  On 10/11/2018 at 12:04 AM, MrChoke said:

It holds a variable that I know persists across saves and reloads of the game:

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How do you know said variable persists?

[jabelar]

Unless there is a writeNBT() type method in the class, or some other class that grabs data from the class, then it probably isn't actually saved. 

[MrChoke]

So yes I agree, it must only be NBT reds/writes that get things saved.  Turns out that path var and many other things actually get re-initialized from scratch when a world is loaded.

 

So if I want to save my own data to the a save, I guess I use what is explained here:

https://mcforge.readthedocs.io/en/latest/datastorage/worldsaveddata/

 

[Cadiboo]

  On 10/13/2018 at 9:36 PM, MrChoke said:

So yes I agree, it must only be NBT reds/writes that get things saved.  Turns out that path var and many other things actually get re-initialized from scratch when a world is loaded.

 

So if I want to save my own data to the a save, I guess I use what is explained here:

https://mcforge.readthedocs.io/en/latest/datastorage/worldsaveddata/

 

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Or capabilities

[Animefan8888]

  On 10/14/2018 at 1:25 AM, Cadiboo said:

Or capabilities

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Capabilities just wrap around World Saved Data. However it may need to be an entity capability if it is something like the provided example.