pick class to create object of given string

[marsh ember]

I have this code (in a minecraft mod I'm creating):

SubCommand command = null;
            
            switch (argsRaw[0]) {
                //help menu
                case "help": {
                    command = new help();
                    break;
                
                //basic calculations
                } case "airtime": case "duration": {
                    command = new airtime();
                    break;
                    
                } case "distance": {
                    command = new distance();
                    break;
                    
                } case "height": {
                    command = new height();
                    break;
                    
                //utility
                } case "face": case "rotate": {
                    command = new face();
                    break;

                } case "optimizesensitivity": case "optimizesens": case "optimisesensitivity": case "optimisesens": {
                    command = new optimizesensitivity();
                    break;
                    
                } case "setsensitivity": case "setsens": {
                    command = new setsensitivity();
                    break;
                
                //advanced calculations
                } case "taps": case "tapsetup": case "bruteforcetaps": {
                    command = new taps();
                    break;
                    
                //command doesn't exist
                } default: {
                    Main.sendChatMessage("\"" + argsRaw[0] + "\" is not a valid command. Use /mm help for a list of commands.");
                    return;
                }
            }
            //execute
            command.run(args);

Is there any way i can make it so its similar to this:

String commandName = argsRaw[0];
command = new "commandName"();

[celest lance]

Hey, @marsh ember!
Please remember to /close this post once your question has been answered!

[marsh ember]

what the commands look like

also, not only just finding which class to create an object of by its getCommandName() but could I also use the aliases

[dull rapids]

oh man you can reflection here, what are you trying to do

[dull rapids]

you want to find object by name, or you HAVE TO create it?

[marsh ember]

i have to create it

like

if argsRaw[0] is "airtime"

i create a new instance of the airtime class

etc

[void gull]

I think it will be wise to use Factory pattern. You can create CommandFactory with method getInstance(String commandName) which will go through all your SubCommand implementations and find one with getCommandName() value equals to commandName argument.

[marsh ember]

how does CommandFactory work?

[void gull]

Inside CommandFactory you can get all SubCommand implementations by using Reflection mechanism. After that by calling getCommandName method (which can be static) you can find needed implementation and create an instance.

[dull rapids]

Class<?> clazz = Class.forName("name");
var object = clazz.getDeclaredConstructor().newInstance();

you can use either this or factory pattern.

[marsh ember]

alr

my brains currently overloaded with something else ill look at this later

[marsh ember]

this wouldnt work with the aliases tho

[dull rapids]

then use Factory pattern

[marsh ember]

what is that

srry is there a documentation

or tutorial

[void gull]

There are a lot of tutorials in google. Just write "factory pattern java explained" or something else. I found that one https://www.geeksforgeeks.org/factory-method-design-pattern-in-java/. Looks like very similar to your case.

[marsh ember]

I'm looking at this and it's still just the switch() statement

[dull rapids]

there is no any better way to do this

or you want to use enum, but factory pattern would be the best

[marsh ember]

is there no way to just do like

look thru package morphmod.commands for matching alias or name

rather than just a massive chain which will get very annoying to work with as i add more commands

or is there a method to like

get an object array of all classes in the morphmod.commands package

and i can just put a for loop and check if one of the objects in the array's getCommandName or getCommandAliases match

[marsh ember]

ok long story short https://stackoverflow.com/questions/10910510/get-a-array-of-class-files-inside-a-package-in-java i may or may not have "borrowed" this guys code

and it works now