ItemBlockLeaves.java

package com.progwml6.natura.common.item;

import net.minecraft.block.Block;
import slimeknights.mantle.item.ItemBlockMeta;

public class ItemBlockLeaves extends ItemBlockMeta
{
    public ItemBlockLeaves(Block block)
    {
        super(block);
    }

    @Override
    public int getMetadata(int damage)
    {
        return damage | 4; // this sets the CHECK_DECAY bit which means the leaves placed by this item don't decay
    }
}