TestPlugin.java

package com.gmail.socraticphoenix.testplugin;

import org.spongepowered.api.entity.living.player.Player;
import org.spongepowered.api.event.Listener;
import org.spongepowered.api.event.filter.cause.First;
import org.spongepowered.api.event.filter.type.Include;
import org.spongepowered.api.event.item.inventory.InteractItemEvent;
import org.spongepowered.api.plugin.Plugin;
import org.spongepowered.api.text.Text;
import org.spongepowered.api.text.format.TextColor;
import org.spongepowered.api.text.format.TextColors;

import java.util.Random;

@Plugin(id = "testdatafirstlogin")
public class TestPlugin {
    private static Random random = new Random();

    @Listener
    @Include({InteractItemEvent.Primary.class, InteractItemEvent.Secondary.class})
    public void onClickItem(InteractItemEvent event, @First Player player) {
        TextColor[] colors = new TextColor[]{TextColors.GOLD, TextColors.GREEN, TextColors.AQUA, TextColors.BLUE, TextColors.YELLOW};

        String type;

        if (event instanceof InteractItemEvent.Primary) {
            type = "primary";
        } else {
            type = "secondary";
        }

        event.setCancelled(true);
        player.sendMessage(Text.of(colors[random.nextInt(colors.length)], type));
    }

}