RespawnHealth.java

package com.wwsean08.RespawnHealth;

import java.util.logging.Logger;

import org.bukkit.Bukkit;
import org.bukkit.Server;
import org.bukkit.event.Event;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.util.config.Configuration;

public class RespawnHealth extends JavaPlugin{
    //all of the instance variables, some are important, others not quite so much
    private Configuration config;   //this is the variable that allows us to access the config file
    private Server server;          //this is a hook into the server which is useful
    private PluginManager pm;       //the plugin manager that allows us to register our player listener
    private RespawnHealthPlayerListener playerListener;     //our player listener
    int respawnHealth;              //the health we will leave the player with upon respawn
    final String PREFIX = "[RespawnHealth] ";   //the prefix that showes up in the console
    Logger log;                     //the logger that displays the text in the console
    final String VERSION = "1.0.0"; //the version that is displayed in the console

    //the method that is called when disabling the plugin (like on server shutdown)
    @Override
    public void onDisable() {
        log.info(PREFIX + "disabled");
    }

    //the method that is called when enabling the plugin on server startup
    @Override
    public void onEnable() {
        server = Bukkit.getServer();    //this instantiates the server variable so we can use it
        log = server.getLogger();       //this gets the logger using the server (my prefered way of doing it)
        pm = server.getPluginManager(); //we also instantiate the plugin manager using the server
        playerListener = new RespawnHealthPlayerListener(this); //instantiate the playerListener we created
        config = this.getConfiguration();   //instantiate the configuration (note that the getConfiguration method does not exist in the plugin
                                            //this takes advantage of extending JavaPlugin.  I can explain more if you want.
        checkForConfigFile();               //check if the config file exists already, if not, make it
        respawnHealth = config.getInt("respawnHealth", 2);  //get the respawn health value, it's default is 2, if i was smart i wouuld put some error checking in
        log.info(PREFIX + "Health upon respawn set to " + respawnHealth);   //print out the respawn health value to the server console
        pm.registerEvent(Event.Type.PLAYER_RESPAWN, playerListener, Event.Priority.Low, this);  //register our event, if you would like to understand this better...well i'm not
                                                                //going to be able to help you with that unfortunately lol.  I just know how to use it.
        log.info(PREFIX + "V. " + VERSION + " enabled");
    }

    private void checkForConfigFile(){
        Object test = config.getProperty("respawnHealth");  //we get the property of respawnHealth which is in the config file, if it comes back null we know 1 of 2 things
        /*
         * 1. The file does not exist, which means either the plugin has never been run or that the file got deleted for some reason.
         * 2. A user messed with the file and so the value should be reset anyways.
         */
        if(test == null){
            config.setProperty("respawnHealth", 2);     //we write the value to the config file
            config.save();                              //save it
            log.info(PREFIX + "config.yml created");    //give user output
        }
    }
}