Let's use the PrisonerJailedEvent in the jailing of a player.

src/main/java/com/graywolf336/jail/command/commands/JailCommand.java

@@ -9,10 +9,12 @@ import org.bukkit.entity.Player;
 import com.beust.jcommander.JCommander;
 import com.beust.jcommander.ParameterException;
 import com.graywolf336.jail.JailManager;
+import com.graywolf336.jail.beans.Jail;
 import com.graywolf336.jail.beans.Prisoner;
 import com.graywolf336.jail.command.Command;
 import com.graywolf336.jail.command.CommandInfo;
 import com.graywolf336.jail.command.parameters.JailParameters;
+import com.graywolf336.jail.events.PrisonerJailedEvent;
 
 @CommandInfo(
 		maxArgs = -1,
@@ -24,6 +26,15 @@ import com.graywolf336.jail.command.parameters.JailParameters;
 	)
 public class JailCommand implements Command {
 	
+	/*
+	 * Executes the command. Checks the following:
+	 * 
+	 * - If there are any jails.
+	 * - If the command can be parsed correctly.
+	 * - If the specified jail is null (TODO: if no jail given then find one close to them)
+	 * - If the given time can be parsed correctly, defaults to 10 minutes at the moment TODO
+	 * - If the prisoner is online or not.
+	 */
 	public boolean execute(JailManager jm, CommandSender sender, String... args) {
 		
 		if(jm.getJails().size() == 0) {
@@ -40,6 +51,12 @@ public class JailCommand implements Command {
 			return true;
 		}
 		
+		//TODO: Add a way to get the nearest jail if they provide no jail
+		if(jm.getJail(params.jail()) == null) {
+			sender.sendMessage(ChatColor.RED + "No jail found by the name of '" + params.jail() + "'.");
+			return true;
+		}
+		
 		Long time = 10L;
 		
 		try {
@@ -49,17 +66,38 @@ public class JailCommand implements Command {
 			return true;
 		}
 		
-		Player p = jm.getPlugin().getServer().getPlayer(params.player());
+		Jail j = jm.getJail(params.jail());
 		Prisoner pris = new Prisoner(params.player(), params.muted(), TimeUnit.MILLISECONDS.convert(time, TimeUnit.MINUTES));
+		Player p = jm.getPlugin().getServer().getPlayer(params.player());
+		
+		//call the event
+		PrisonerJailedEvent event = new PrisonerJailedEvent(j, pris, p, p == null, sender.getName());
+		jm.getPlugin().getServer().getPluginManager().callEvent(event);
+		
+		//check if the event is cancelled
+		if(event.isCancelled()) {
+			if(event.getCancelledMessage().isEmpty())
+				sender.sendMessage(ChatColor.RED + "Jailing " + params.player() + " was cancelled by another plugin and they didn't leave you a message.");
+			else
+				sender.sendMessage(event.getCancelledMessage());
+				
+			return true;
+		}
+		
+		//recall data from the event
+		j = event.getJail();
+		pris = event.getPrisoner();
+		p = event.getPlayer();
+		String jailer = event.getJailer();
 		
 		//Player is not online
 		if(p == null) {
-			sender.sendMessage(pris.getName() + " is offline and will be jailed for " + pris.getRemainingTime() + " milliseconds in the jail " + params.jail() + "in the cell " + params.cell() + " and will be muted: " + pris.isMuted() + ".");
+			sender.sendMessage(pris.getName() + " is offline and will be jailed for " + pris.getRemainingTime() + " milliseconds in the jail " + params.jail() + " in the cell " + params.cell() + " and will be muted: " + pris.isMuted() + ".");
-			sender.sendMessage(pris.getName() + " will be jailed for " + TimeUnit.MINUTES.convert(pris.getRemainingTime(), TimeUnit.MILLISECONDS) + " minutes.");
+			sender.sendMessage(pris.getName() + " will be jailed for " + TimeUnit.MINUTES.convert(pris.getRemainingTime(), TimeUnit.MILLISECONDS) + " minutes by " + jailer + ".");
 		}else {
 			//Player *is* online
-			sender.sendMessage(pris.getName() + " is online and will be jailed for " + pris.getRemainingTime() + " milliseconds in the jail " + params.jail() + "in the cell " + params.cell() + " and will be muted: " + pris.isMuted() + ".");
+			sender.sendMessage(pris.getName() + " is online and will be jailed for " + pris.getRemainingTime() + " milliseconds in the jail " + params.jail() + " in the cell " + params.cell() + " and will be muted: " + pris.isMuted() + ".");
-			sender.sendMessage(pris.getName() + " will be jailed for " + TimeUnit.MINUTES.convert(pris.getRemainingTime(), TimeUnit.MILLISECONDS) + " minutes.");
+			sender.sendMessage(pris.getName() + " will be jailed for " + TimeUnit.MINUTES.convert(pris.getRemainingTime(), TimeUnit.MILLISECONDS) + " minutes by " + jailer + ".");
 		}
 		
 		return true;

src/main/java/com/graywolf336/jail/events/PrisonerJailedEvent.java

@@ -1,5 +1,13 @@
 package com.graywolf336.jail.events;
 
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+
+import com.graywolf336.jail.beans.Jail;
+import com.graywolf336.jail.beans.Prisoner;
+
 /**
  * Event thrown when a player is fixing to be jailed, both offline and online players.
  * 
@@ -7,8 +15,94 @@ package com.graywolf336.jail.events;
  * 
  * @author graywolf336
  * @since 3.0.0
- * @version 0.0.0
+ * @version 1.0.0
  */
-public class PrisonerJailedEvent {
+public class PrisonerJailedEvent extends Event implements Cancellable {
+	private static final HandlerList handlers = new HandlerList();
+	private boolean cancelled;
+	private boolean online;
+	private Jail jail;
+	private Prisoner prisoner;
+	private Player player;
+	private String jailer, cancelMsg;
 	
+	/**
+	 * Creates a new {@link PrisonerJailedEvent prisoner jailed event} for the given player.
+	 * 
+	 * @param jail The jail the prisoner will be jailed at.
+	 * @param prisoner The prisoner data.
+	 * @param player The player being jailed.
+	 * @param online Whether the player is online or not.
+	 * @param jailer The name of what jailed this prisoner.
+	 */
+	public PrisonerJailedEvent(Jail jail, Prisoner prisoner, Player player, boolean online, String jailer) {
+		this.jail = jail;
+		this.prisoner = prisoner;
+		this.player = player;
+		this.online = online;
+		this.jailer = jailer;
+		cancelMsg = "";
+	}
+	
+	/** Gets the {@link Jail} this prisoner is being sent to. */
+	public Jail getJail() {
+		return this.jail;
+	}
+	
+	/** Gets the {@link Prisoner} data for this prisoner. */
+	public Prisoner getPrisoner() {
+		return this.prisoner;
+	}
+	
+	/** Gets the instance of the player being jailed <strong>but will return null if {@link #isOnline()} returns false</strong>. */
+	public Player getPlayer() {
+		return this.player;
+	}
+	
+	/** Gets whether the prisoner being jailed is online or not. */
+	public boolean isOnline() {
+		return this.online;
+	}
+	
+	/** Gets the jailer who jailed this prisoner. */
+	public String getJailer() {
+		return this.jailer;
+	}
+	
+	/**
+	 * Sets the prisoner whom the data should say jailed this prisoner.
+	 * 
+	 * @param jailer The name to put who is the jailer for this prisoner.
+	 */
+	public void setJailer(String jailer) {
+		this.jailer = jailer;
+	}
+	
+	/** Checks whether this event is cancelled or not. */
+	public boolean isCancelled() {
+		return this.cancelled;
+	}
+
+	/** Sets whether this event should be cancelled. */
+	public void setCancelled(boolean cancel) {
+		this.cancelled = cancel;
+	}
+	
+	/** Returns the cancelled message. */
+	public String getCancelledMessage() {
+		return this.cancelMsg;
+	}
+	
+	/** Sets the cancelled message. */
+	public void setCancelledMessage(String msg) {
+		this.cancelMsg = msg;
+	}
+	
+	public static HandlerList getHandlerList() {
+		return handlers;
+	}
+
+	public HandlerList getHandlers() {
+		return handlers;
+	}
 }