TreeGeneration

package com.chef.mod.generate;

import java.util.Random;

import net.minecraft.util.BlockPos;
import net.minecraft.world.World;
import net.minecraft.world.biome.BiomeGenBase;
import net.minecraft.world.biome.BiomeGenJungle;
import net.minecraft.world.biome.BiomeGenSavanna;
import net.minecraft.world.chunk.IChunkProvider;
import net.minecraftforge.fml.common.IWorldGenerator;

import com.chef.mod.generate.features.WorldGenMangoTree;
import com.chef.mod.generate.features.WorldGenOliveTree;

public class TreeGeneration implements IWorldGenerator {

    @Override
    public void generate(Random random, int chunkX, int chunkZ, World world, IChunkProvider chunkGenerator, IChunkProvider chunkProvider) {
        switch (world.provider.getDimensionId()) {
        case 1:
            generateEnd(world, random, chunkX * 16, chunkZ * 16);
            break;
        case 0:
            generateOverworld(world, random, chunkX * 16, chunkZ * 16);
            break;
        case -1:
            generateNether(world, random, chunkX * 16, chunkZ * 16);
            break;
        }
    }

    public void generateEnd(World world, Random rand, int x, int z) {

    }

    public void generateOverworld(World world, Random random, int x, int z) {

        this.addTreeSpawn(world, "mango", random, x, z, 16, 16, 40, 100, 1);
        this.addTreeSpawn(world, "olive_green", random, x, z, 16, 16, 40, 100, 1);
        this.addTreeSpawn(world, "olive_black", random, x, z, 16, 16, 40, 100, 1);

    }

    public void generateNether(World world, Random rand, int x, int z) {

    }

    public void addTreeSpawn(World world, String treeName, Random random, int blockXpos, int blockZpos, int maxX, int maxZ, int minY, int maxY, int chanceToSpawn) {

        for (int i = 0; i < chanceToSpawn; i++) {

            int posX = blockXpos + random.nextInt(maxX);
            int posY = minY + random.nextInt(maxY - minY);
            int posZ = blockZpos + random.nextInt(maxZ);
            BiomeGenBase biome = world.getBiomeGenForCoords(new BlockPos(posX, posY, posZ));

            if (treeName.equalsIgnoreCase("mango")) {

                if (biome instanceof BiomeGenJungle) {

                    (new WorldGenMangoTree()).generate(world, random, (new BlockPos(posX, posY, posZ)));

                }
            }

            if (biome instanceof BiomeGenSavanna) {

                if (treeName.equalsIgnoreCase("olive_green")) {

                    (new WorldGenOliveTree(true)).generate(world, random, (new BlockPos(posX, posY, posZ)));

                } else if (treeName.equalsIgnoreCase("olive_black")) {

                    (new WorldGenOliveTree(false)).generate(world, random, (new BlockPos(posX, posY, posZ)));

                }
            }
        }
    }
}