Improve command handling and exception structure.

src/main/java/org/appledash/saneeconomy/command/SaneEconomyCommand.java

@@ -1,6 +1,8 @@
 package org.appledash.saneeconomy.command;
 
-import org.appledash.saneeconomy.command.exception.*;
+import org.appledash.saneeconomy.command.exception.CommandException;
+import org.appledash.saneeconomy.command.exception.type.NoPermissionException;
+import org.appledash.saneeconomy.command.exception.type.usage.UsageException;
 import org.appledash.saneeconomy.utils.MessageUtils;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
@@ -19,11 +21,14 @@ public abstract class SaneEconomyCommand implements CommandExecutor {
             }
 
             return onCommand(sender, args);
-        } catch (TooFewArgumentsException | NeedPlayerException | InvalidUsageException e) {
+        } catch (UsageException e) {
+            /* Invalid usage in some way, print out exactly what went wrong along with the proper usage. */
             MessageUtils.sendMessage(sender, e.getMessage());
+
             for (String s : getUsage()) {
                 MessageUtils.sendMessage(sender, String.format("Usage: %s", s.replace("<command>", label)));
             }
+            
             return true;
         } catch (CommandException e) {
             MessageUtils.sendMessage(sender, e.getMessage());
@@ -31,7 +36,18 @@ public abstract class SaneEconomyCommand implements CommandExecutor {
         }
     }
 
+    /**
+     * Get the permission node required to use the command.
+     * @return Permission node.
+     */
     public abstract String getPermission();
+
+    /**
+     * Get the command's usage.
+     * When this is printed, '<command>' will be replaced with the command name.
+     * @return Command usage examples
+     */
     public abstract String[] getUsage();
-    public abstract boolean onCommand(CommandSender sender, String[] args) throws CommandException;
+
+    protected abstract boolean onCommand(CommandSender sender, String[] args) throws CommandException;
 }

src/main/java/org/appledash/saneeconomy/command/exception/type/NoPermissionException.java

@@ -1,4 +1,6 @@
-package org.appledash.saneeconomy.command.exception;
+package org.appledash.saneeconomy.command.exception.type;
+
+import org.appledash.saneeconomy.command.exception.CommandException;
 
 /**
  * Created by AppleDash on 6/13/2016.

src/main/java/org/appledash/saneeconomy/command/exception/type/usage/InvalidUsageException.java

@@ -1,10 +1,10 @@
-package org.appledash.saneeconomy.command.exception;
+package org.appledash.saneeconomy.command.exception.type.usage;
 
 /**
  * Created by AppleDash on 6/13/2016.
  * Blackjack is still best pony.
  */
-public class InvalidUsageException extends CommandException {
+public class InvalidUsageException extends UsageException {
     @Override
     public String getMessage() {
         return "Invalid syntax for that command!";

src/main/java/org/appledash/saneeconomy/command/exception/type/usage/NeedPlayerException.java

@@ -1,10 +1,10 @@
-package org.appledash.saneeconomy.command.exception;
+package org.appledash.saneeconomy.command.exception.type.usage;
 
 /**
  * Created by AppleDash on 6/13/2016.
  * Blackjack is still best pony.
  */
-public class NeedPlayerException extends CommandException {
+public class NeedPlayerException extends UsageException {
     @Override
     public String getMessage() {
         return "That command requires a player argument when not run by a player.";

src/main/java/org/appledash/saneeconomy/command/exception/type/usage/TooFewArgumentsException.java

@@ -1,10 +1,10 @@
-package org.appledash.saneeconomy.command.exception;
+package org.appledash.saneeconomy.command.exception.type.usage;
 
 /**
  * Created by AppleDash on 6/13/2016.
  * Blackjack is still best pony.
  */
-public class TooFewArgumentsException extends CommandException {
+public class TooFewArgumentsException extends UsageException {
     @Override
     public String getMessage() {
         return "Wrong number of arguments for that command!";

src/main/java/org/appledash/saneeconomy/command/exception/type/usage/UsageException.java

@@ -0,0 +1,10 @@
+package org.appledash.saneeconomy.command.exception.type.usage;
+
+import org.appledash.saneeconomy.command.exception.CommandException;
+
+/**
+ * Created by AppleDash on 6/14/2016.
+ * Blackjack is still best pony.
+ */
+public class UsageException extends CommandException {
+}

src/main/java/org/appledash/saneeconomy/command/type/BalanceCommand.java

@@ -3,7 +3,7 @@ package org.appledash.saneeconomy.command.type;
 import org.appledash.saneeconomy.SaneEconomy;
 import org.appledash.saneeconomy.command.SaneEconomyCommand;
 import org.appledash.saneeconomy.command.exception.CommandException;
-import org.appledash.saneeconomy.command.exception.NeedPlayerException;
+import org.appledash.saneeconomy.command.exception.type.usage.NeedPlayerException;
 import org.appledash.saneeconomy.utils.MessageUtils;
 import org.bukkit.Bukkit;
 import org.bukkit.command.CommandSender;

src/main/java/org/appledash/saneeconomy/command/type/EconomyAdminCommand.java

@@ -3,9 +3,9 @@ package org.appledash.saneeconomy.command.type;
 import org.appledash.saneeconomy.SaneEconomy;
 import org.appledash.saneeconomy.command.SaneEconomyCommand;
 import org.appledash.saneeconomy.command.exception.CommandException;
-import org.appledash.saneeconomy.command.exception.InvalidUsageException;
-import org.appledash.saneeconomy.command.exception.NeedPlayerException;
-import org.appledash.saneeconomy.command.exception.TooFewArgumentsException;
+import org.appledash.saneeconomy.command.exception.type.usage.InvalidUsageException;
+import org.appledash.saneeconomy.command.exception.type.usage.NeedPlayerException;
+import org.appledash.saneeconomy.command.exception.type.usage.TooFewArgumentsException;
 import org.appledash.saneeconomy.economy.EconomyManager;
 import org.appledash.saneeconomy.utils.MessageUtils;
 import org.bukkit.Bukkit;