Add support for per issuer locale in Sponge and BungeeCord (#104)

* Add support for per issuer locale in Sponge and BungeeCord

* Added Optional<UUID> getUniqueId to CommandIssuer
* Added update task and delayed join listener in BungeeCord
* Added settings change listener in Sponge
* Moved setLocale method up to the CommandManager to remove the
amount of duplicated code

* Remove Optional usage

* Remove player terminology in core

core/src/main/java/co/aikar/commands/CommandIssuer.java

@@ -25,6 +25,9 @@ package co.aikar.commands;
 
 import co.aikar.locales.MessageKey;
 import co.aikar.locales.MessageKeyProvider;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.UUID;
 
 public interface CommandIssuer {
     /**
@@ -50,6 +53,11 @@ public interface CommandIssuer {
         getManager().sendMessage(this, MessageType.INFO, MessageKeys.INFO_MESSAGE, "{message}", message);
     }
 
+    /**
+     * @return the unique id of that issuer
+     */
+    @NotNull UUID getUniqueId();
+
     /**
      * Has permission node
      * @param permission

core/src/main/java/co/aikar/commands/CommandManager.java

@@ -27,6 +27,7 @@ import co.aikar.commands.annotation.Dependency;
 import co.aikar.locales.MessageKeyProvider;
 import com.google.common.collect.HashBasedTable;
 import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import com.google.common.collect.Table;
 import org.jetbrains.annotations.NotNull;
@@ -35,14 +36,16 @@ import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.lang.reflect.Parameter;
-import java.util.Arrays;
 import java.util.HashMap;
 import java.util.IdentityHashMap;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Set;
 import java.util.Stack;
+import java.util.UUID;
+
 
 @SuppressWarnings("WeakerAccess")
 public abstract class CommandManager <
@@ -76,6 +79,8 @@ public abstract class CommandManager <
     protected MF defaultFormatter;
     protected int defaultHelpPerPage = 10;
 
+    protected Map<UUID, Locale> issuersLocale = Maps.newConcurrentMap();
+
     private Set<String> unstableAPIs = Sets.newHashSet();
 
     public static CommandOperationContext getCurrentCommandOperationContext() {
@@ -344,7 +349,25 @@ public abstract class CommandManager <
         });
     }
 
+    public Locale setIssuerLocale(IT issuer, Locale locale) {
+        I commandIssuer = getCommandIssuer(issuer);
+
+        Locale old = issuersLocale.put(commandIssuer.getUniqueId(), locale);
+        if (!Objects.equals(old, locale)) {
+            this.notifyLocaleChange(commandIssuer, old, locale);
+        }
+
+        return old;
+    }
+
     public Locale getIssuerLocale(CommandIssuer issuer) {
+        if (usingPerIssuerLocale()) {
+            Locale locale = issuersLocale.get(issuer.getUniqueId());
+            if (locale != null) {
+                return locale;
+            }
+        }
+
         return getLocales().getDefaultLocale();
     }