Harvest Check 
To use this event use the following import:
groovy
import net.minecraftforge.event.entity.player.PlayerEvent.HarvestCheckSub-Classes 
This event extends the following events and can use all their methods and fields: 
PlayerEvent, LivingEvent, EntityEvent
Methods 
groovy
boolean canHarvest()groovy
net.minecraft.block.state.IBlockState getTargetBlock()groovy
void setCanHarvest(boolean arg0)