minecraft-source/src/net/minecraft/world/item/GameMasterBlockItem.java

package net.minecraft.world.item;

import javax.annotation.Nullable;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.block.Block;

public class GameMasterBlockItem extends BlockItem {
    public GameMasterBlockItem(final Block bpe, final Properties a) {
        super(bpe, a);
    }
    
    @Nullable
    @Override
    protected BlockState getPlacementState(final BlockPlaceContext bcn) {
        final Player ayg3 = bcn.getPlayer();
        return (ayg3 == null || ayg3.canUseGameMasterBlocks()) ? super.getPlacementState(bcn) : null;
    }
}