[1.11.2] retrieving possible drops from mob

[Thefifth]

Hi all

 

I've been trying to find a way to get this information in a readable format for a while now, most searches (both here and via Google) usually lead to someone trying to add a drop to an existing mob.

 

What I'm trying to do is find out the possible drops from an entity standing on/near my tile entity. As in, if it were a skeleton, it would be an array containing arrows, bones and broken bows etc.

 

Is this at all possible or would I need to hard code these lists? I'd like to avoid that as obviously that means that it wouldn't work for custom mobs or mobs with edited drop tables.

 

Thanks in advance for any help.

[Choonster]

If EntityLiving#getLootTable returns a non-null value, you can use LootTableManager#getLootTableFromLocation to get the LootTable from that ResourceLocation. You can then go through the table's pools and entries to build the list.

 

If the entity doesn't use a loot table (e.g. EntityWither), you'll need to hardcode its drop list.

 

Look at JustEnoughResources for an example of how to work with loot tables. 

[Leviathan143]

There's one important thing Choonster forgot.  EntityLiving#getLootTable is protected, so you'll need to use Java Reflection or Forge Access Transformers to call it.

[Draco18s]

56 minutes ago, Leviathan143 said:

There's one important thing Choonster forgot.  EntityLiving#getLootTable is protected, so you'll need to use Java Reflection or Forge Access Transformers to call it.

Correction:

You will need to use Reflection.

 

Access Transformers are coremodding and coremodding is not sanctioned here.

[Leviathan143]

1 hour ago, Draco18s said:

Correction:

You will need to use Reflection.

 

Access Transformers are coremodding and coremodding is not sanctioned here.

Access Transformers don't require a coremod. You create a text file in a certain place, define the access transformations you want to make in it, add some lines to your build.gradle and run gradle setupDecompWorkspace. As far as I am aware access transformers are part  of ForgeGradle, there is no coremod involved.

Edited February 6, 2017 by Leviathan143

[Draco18s]

You still shouldn't be using them.  Reflection can do the same thing.

[Thefifth]

I've been fiddling about with ReflectionHelper and getting some results. Just as a quick question, am I on the right track here:

 

//..
if (ent instanceof EntityLiving)
{
	try
	{
		ResourceLocation loc = (ResourceLocation) ReflectionHelper.getPrivateValue(ent.getClass(), ent, new String[]{"getLootTable"});
		if (loc != null)
		{
			//..
		}
	}
	catch (Exception e)
	{
	//..
	}
}

 

Or am I way off and need to rethink this.

 

Again, thanks in advance.

[Choonster]

ReflectionHelper.getPrivateValue gets the value of a field, EntityLiving#getLootTable is a method.

 

Looking up a field/method via reflection is expensive, so you should use ReflectionHelper.findField/findMethod and store the Field/Method object in a static final field and use that to access/modify the field's value or call the method.

 

You're only passing the MCP name of the method to ReflectionHelper, so it won't work outside of the development environment. You need to pass the SRG name as well as the MCP name. You can find the SRG name of a field/method using MCPBot.

[Thefifth]

Thanks for all your help on this, I've managed to get my tile entity println'ing minecraft:entities/<entity>, which means I'm getting the right ResourceLocation. Unfortunately I need sleep to function tomorrow so I'll have to pick up on this tomorrow.

 

Thanks again everyone.