minecraft-kajetans-mod/src/main/java/me/km/effects/active/Harvest.java

 package me.km.effects.active;

import me.km.KajetansMod;
import me.km.effects.ActiveEffectBase;
import net.minecraft.block.BlockCrops;
import net.minecraft.block.state.IBlockState;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;

public class Harvest extends ActiveEffectBase
{
    @Override
    protected boolean executeEffect(EntityPlayerMP p, int power) 
    {
        int radius = 1 + 2 * power;
        World w = p.world;
        BlockPos pos = p.getPosition();
        BlockPos pos2;
        IBlockState b;
        for(int x = -radius; x <= radius; x++)
        {
            for(int y = -radius; y <= radius; y++)
            {
                for(int z = -radius; z <= radius; z++)
                {
                    pos2 = pos.add(x, y, z);
                    b = w.getBlockState(pos2);
                    if(b.getBlock() instanceof BlockCrops && b.getValue(BlockCrops.AGE) == 7)
                    {
                        b.getBlock().dropBlockAsItem(w, pos2, b, 0);
                        w.setBlockState(pos2, b.withProperty(BlockCrops.AGE, 0));               
                    }      
                }
            }
        }
        KajetansMod.effects.send(p, "Die Pflanzen in deiner Umgebung wurden geerntet!");
        return true;
    }
    
    @Override
    protected int getManaCost(int manaFactor) 
    {
        return 5 * manaFactor;
    }
}