Implemented gamemode methods

src/main/java/net/minecraft/server/WorldData.java

@@ -19,7 +19,7 @@ public class WorldData {
     private int m;
     private boolean n;
     private int o;
-    private int p;
+    public int p; // CraftBukkit - private -> public
     private boolean q;
 
     public WorldData(NBTTagCompound nbttagcompound) {

src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -822,10 +822,16 @@ public final class CraftServer implements Server {
     }
 
     public GameMode getDefaultGameMode() {
-        return GameMode.SURVIVAL;
+        return GameMode.getByValue(console.worlds.get(0).worldData.p);
     }
 
     public void setDefaultGameMode(GameMode mode) {
-        throw new UnsupportedOperationException("Not supported yet.");
+        if (mode == null) {
+            throw new IllegalArgumentException("Mode cannot be null");
+        }
+
+        for (World world : getWorlds()) {
+            ((CraftWorld)world).getHandle().worldData.p = mode.getValue();
+        }
     }
 }

src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java

@@ -19,9 +19,11 @@ public class CraftHumanEntity extends CraftLivingEntity implements HumanEntity {
     private CraftInventoryPlayer inventory;
     protected final PermissibleBase perm = new PermissibleBase(this);
     private boolean op;
+    private GameMode mode;
 
     public CraftHumanEntity(final CraftServer server, final EntityHuman entity) {
         super(server, entity);
+        mode = server.getDefaultGameMode();
         this.inventory = new CraftInventoryPlayer(entity.inventory);
     }
 
@@ -119,10 +121,14 @@ public class CraftHumanEntity extends CraftLivingEntity implements HumanEntity {
     }
 
     public GameMode getGameMode() {
-        return GameMode.SURVIVAL;
+        return mode;
     }
 
     public void setGameMode(GameMode mode) {
-        throw new UnsupportedOperationException("Not supported yet.");
+        if (mode == null) {
+            throw new IllegalArgumentException("Mode cannot be null");
+        }
+
+        this.mode = mode;
     }
 }

src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java

@@ -12,9 +12,11 @@ import net.minecraft.server.Packet53BlockChange;
 import net.minecraft.server.Packet54PlayNoteBlock;
 import net.minecraft.server.Packet61;
 import net.minecraft.server.Packet6SpawnPosition;
+import net.minecraft.server.Packet70Bed;
 import net.minecraft.server.WorldServer;
 import org.bukkit.Achievement;
 import org.bukkit.Effect;
+import org.bukkit.GameMode;
 import org.bukkit.Instrument;
 import org.bukkit.Location;
 import org.bukkit.Material;
@@ -377,4 +379,21 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
             server.getHandle().l(getName().toLowerCase());
         }
     }
+
+    @Override
+    public void setGameMode(GameMode mode) {
+        if (mode == null) {
+            throw new IllegalArgumentException("Mode cannot be null");
+        }
+
+        if (mode != getGameMode()) {
+            getHandle().itemInWorldManager.a(mode.getValue());
+            getHandle().netServerHandler.sendPacket(new Packet70Bed(3, mode.getValue()));
+        }
+    }
+
+    @Override
+    public GameMode getGameMode() {
+        return GameMode.getByValue(getHandle().itemInWorldManager.a());
+    }
 }