Generation Code

package me.henderry2019.OreGen;

import java.util.Random;

import net.minecraft.block.Block;
import net.minecraft.init.Blocks;
import net.minecraft.world.World;
import net.minecraft.world.chunk.IChunkProvider;
import net.minecraft.world.gen.feature.WorldGenMinable;
import cpw.mods.fml.common.IWorldGenerator;

public class Generation implements IWorldGenerator {

    @Override
    public void generate(Random random, int chunkX, int chunkZ, World world,
            IChunkProvider chunkGenerator, IChunkProvider chunkProvider) {
        switch (world.provider.dimensionId) {
        // Case 1 is End
        case 1:
            generateEnd(world, random, chunkX, chunkZ);
            break;
        // Case 0 is Overworld
        case 0:
            generateOverworld(world, random, chunkX, chunkZ);
            break;
        // Case -1 is Nether
        case -1:
            generateNether(world, random, chunkX, chunkZ);
            break;
        }
    }
    /**Generating ores in End | 1st # is minVienSize 2nd # is maxVienSize 3rd # is chance, 4th # is min world height, 5th is max world height.
     *Blocks.(block) is the block that it is spawned in.
    */
    public void generateEnd(World world, Random random, int x, int z) {
        generateOre(OreGen.blockRuby, world, random, x, z, 1, 10, 5, 5, 20, Blocks.end_stone);
    }
    //Generating ores in Overworld
    public void generateOverworld(World world, Random random, int x, int z) {
        generateOre(OreGen.blockRuby, world, random, x, z, 10, 20, 50, 1, 80, Blocks.stone);
    }
    //Generating ores in Nether
    public void generateNether(World world, Random random, int x, int z) {
        generateOre(OreGen.blockRuby, world, random, x, z, 1, 10, 5, 5, 20, Blocks.netherrack);
    }

    // Defining the generation
    public void generateOre(Block block, World world, Random random,
            int chunkX, int chunkZ, int minVeinSize, int maxVeinSize,
            int chance, int minY, int maxY, Block generateIn) {
        // Telling it that the vein size and height in world is random
        int vienSize = minVeinSize + random.nextInt(maxVeinSize) - minVeinSize;
        int heightRange = maxY - minY;
        WorldGenMinable gen = new WorldGenMinable(block, vienSize, generateIn);
        // Telling it that everything is random
        for (int i = 0; 1 < chance; i++) {
            int xRand = chunkX * 16 + random.nextInt(16);
            int yRand = random.nextInt(heightRange) + minY;
            int zRand = chunkZ * 16 + random.nextInt(16);
            gen.generate(world, random, xRand, yRand, zRand);
        }
    }
}