minecraft-kajetans-mod/src/main/java/me/km/utils/SpecialBlockUtils.java

package me.km.utils;

import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.network.play.server.SPacketUpdateTileEntity;
import net.minecraft.tileentity.TileEntitySign;
import net.minecraft.util.text.TextComponentString;

public class SpecialBlockUtils 
{
    public static void setSignLine(TileEntitySign sign, int line, String text, boolean update)
    {
        if(line < 0 || line > 3)
        {
            return;
        }
        sign.signText[line] = new TextComponentString(text);
        if(update)
        {
            SPacketUpdateTileEntity packet = sign.getUpdatePacket();
            sign.getWorld().playerEntities.stream().filter(p -> p instanceof EntityPlayerMP)
                    .forEach(p -> ((EntityPlayerMP) p).connection.sendPacket(packet));
        }
    }
    
    public static void setSignLine(TileEntitySign sign, int line, String text)
    {
        setSignLine(sign, line, text, true);
    }
}