From 6410e49ab952b1824815d2f4e50da786e1ce0930 Mon Sep 17 00:00:00 2001
From: Bukkit/Spigot <noreply+git-bukkit@papermc.io>
Date: Wed, 2 Mar 2011 15:23:15 +0100
Subject: [PATCH] Java 1.5 compat.

By: Erik Broes <erikbroes@ripe.net>
---
 .../org/bukkit/command/PluginCommand.java     |  2 +-
 .../org/bukkit/command/SimpleCommandMap.java  |  5 +++--
 .../java/org/bukkit/util/Java15Compat.java    | 20 +++++++++++++++++++
 3 files changed, 24 insertions(+), 3 deletions(-)
 create mode 100644 paper-api/src/main/java/org/bukkit/util/Java15Compat.java

diff --git a/paper-api/src/main/java/org/bukkit/command/PluginCommand.java b/paper-api/src/main/java/org/bukkit/command/PluginCommand.java
index 2f306bb84d..27eb0b1881 100644
--- a/paper-api/src/main/java/org/bukkit/command/PluginCommand.java
+++ b/paper-api/src/main/java/org/bukkit/command/PluginCommand.java
@@ -33,7 +33,7 @@ public final class PluginCommand extends Command {
             throw new CommandException("Unhandled exception executing command '" + commandLabel + "' in plugin " + owningPlugin.getDescription().getFullName(), ex);
         }
 
-        if (!success && !usageMessage.isEmpty()) {
+        if (!success && usageMessage.length() > 0) {
             sender.sendMessage(usageMessage.replace("<command>", commandLabel));
         }
         
diff --git a/paper-api/src/main/java/org/bukkit/command/SimpleCommandMap.java b/paper-api/src/main/java/org/bukkit/command/SimpleCommandMap.java
index 94241ec308..9bd8529c4f 100644
--- a/paper-api/src/main/java/org/bukkit/command/SimpleCommandMap.java
+++ b/paper-api/src/main/java/org/bukkit/command/SimpleCommandMap.java
@@ -10,6 +10,7 @@ import org.bukkit.Server;
 
 import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.PluginDescriptionFile;
+import static org.bukkit.util.Java15Compat.Arrays_copyOfRange;
 
 public final class SimpleCommandMap implements CommandMap {
     private final Map<String, Command> knownCommands = new HashMap<String, Command>();
@@ -62,7 +63,7 @@ public final class SimpleCommandMap implements CommandMap {
         knownCommands.put(name.toLowerCase(), command);
         return !nameInUse;
     }
-
+    
     /**
      * {@inheritDoc}
      */
@@ -70,7 +71,7 @@ public final class SimpleCommandMap implements CommandMap {
         String[] args = commandLine.split(" ");
         String sentCommandLabel = args[0].toLowerCase();
 
-        args = Arrays.copyOfRange(args, 1, args.length);
+        args = Arrays_copyOfRange(args, 1, args.length);
 
         Command target = getCommand(sentCommandLabel);
         boolean isRegisteredCommand = (target != null);
diff --git a/paper-api/src/main/java/org/bukkit/util/Java15Compat.java b/paper-api/src/main/java/org/bukkit/util/Java15Compat.java
new file mode 100644
index 0000000000..d56169a16d
--- /dev/null
+++ b/paper-api/src/main/java/org/bukkit/util/Java15Compat.java
@@ -0,0 +1,20 @@
+package org.bukkit.util;
+
+import java.lang.reflect.Array;
+
+public class Java15Compat {
+    @SuppressWarnings("unchecked")
+    public static <T> T[] Arrays_copyOfRange(T[] original, int start, int end) {
+        if (original.length >= start && 0 <= start) {
+            if (start <= end) {
+                int length = end - start;
+                int copyLength = Math.min( length, original.length - start);
+                T[] copy = (T[]) Array.newInstance(original.getClass().getComponentType(), length);
+                System.arraycopy(original, start, copy, 0, copyLength);
+                return copy;
+            }
+            throw new IllegalArgumentException();
+        }
+        throw new ArrayIndexOutOfBoundsException();
+    }
+}