Make code less null-happy

A lot of the code is filled with acceptance of null, even when null could mean something went wrong. We no longer want to fail-safe but want to fail fast, so this approach to null is changing. This will surely cause some bugs in the beginning, but will also make them less frequent in the long run.

src/com/massivecraft/massivecore/Progressbar.java

@@ -184,7 +184,7 @@ public class Progressbar
 	
 	public static String colorParse(String string, String colorTag, String color)
 	{
-		if (string == null) return null;
+		if (string == null) throw new NullPointerException("string");
 		string = string.replace(colorTag, color);
 		string = Txt.parse(string);
 		return string;

src/com/massivecraft/massivecore/SoundEffect.java

@@ -81,12 +81,13 @@ public final class SoundEffect implements Serializable
 	
 	public void run(Location location)
 	{
-		if (location == null) return;
+		if (location == null) throw new NullPointerException("location");
 		location.getWorld().playSound(location, this.getSound(), this.getVolume(), this.getPitch());
 	}
 	
 	public void run(HumanEntity human, Location location)
 	{
+		if (human == null) throw new NullPointerException("human");
 		if (MUtil.isntPlayer(human)) return;
 		Player player = (Player)human;
 		player.playSound(location, this.getSound(), this.getVolume(), this.getPitch());
@@ -94,6 +95,7 @@ public final class SoundEffect implements Serializable
 	
 	public void run(HumanEntity human)
 	{
+		if (human == null) throw new NullPointerException("human");
 		if (MUtil.isntPlayer(human)) return;
 		this.run(human, human.getEyeLocation());
 	}
@@ -144,8 +146,6 @@ public final class SoundEffect implements Serializable
 	@Override
 	public boolean equals(Object obj)
 	{
-		if (this == obj) return true;
-		if (obj == null) return false;
 		if (!(obj instanceof SoundEffect)) return false;
 		SoundEffect other = (SoundEffect) obj;
 		if (Float.floatToIntBits(pitch) != Float.floatToIntBits(other.pitch)) return false;

src/com/massivecraft/massivecore/command/MassiveCommand.java

@@ -1651,27 +1651,4 @@ public class MassiveCommand implements Active, PluginIdentifiableCommand
 		return readArgAt(idx);
 	}
 	
-	// TODO: Some of these are still used by external plugins.
-	// TODO: Fix those plugins.
-
-	@Deprecated
-	public <T> T readArgFrom(Type<T> type) throws MassiveException
-	{
-		return this.readArgFrom(null, type);
-	}
-
-	@Deprecated
-	public <T> T readArgFrom(String str, Type<T> type) throws MassiveException
-	{
-		if (type == null) throw new IllegalArgumentException("type is null");
-		return type.read(str, this.sender);
-	}
-
-	@Deprecated
-	public <T> T readArgFrom(String str, Type<T> type, T defaultNotSet) throws MassiveException
-	{
-		if (str == null) return defaultNotSet;
-		return this.readArgFrom(str, type);
-	}
-	
 }

src/com/massivecraft/massivecore/engine/EngineMassiveCorePlayerState.java

@@ -35,7 +35,7 @@ public class EngineMassiveCorePlayerState extends Engine
 		if ( ! active) return;
 		
 		this.idToState.clear();
-		for (Player player : MUtil.getOnlinePlayers())
+		for (Player player : Bukkit.getOnlinePlayers())
 		{
 			this.idToState.put(player.getUniqueId(), PlayerState.JOINED);
 		}

src/com/massivecraft/massivecore/mixin/MixinVisibility.java

@@ -1,7 +1,7 @@
 package com.massivecraft.massivecore.mixin;
 
 import com.massivecraft.massivecore.util.IdUtil;
-import com.massivecraft.massivecore.util.MUtil;
+import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
 
 public class MixinVisibility extends Mixin
@@ -29,7 +29,7 @@ public class MixinVisibility extends Mixin
 		Player pwatchee = IdUtil.getPlayer(watcheeObject);
 		if (pwatchee == null) return true;
 		
-		for (Player pwatcher : MUtil.getOnlinePlayers())
+		for (Player pwatcher : Bukkit.getOnlinePlayers())
 		{
 			if (pwatchee.equals(pwatcher)) continue;
 			if (pwatcher.canSee(pwatchee)) continue;

src/com/massivecraft/massivecore/particleeffect/ParticleEffect.java

@@ -1,8 +1,8 @@
 package com.massivecraft.massivecore.particleeffect;
 
 import com.massivecraft.massivecore.particleeffect.ReflectionUtils.PackageType;
-import com.massivecraft.massivecore.util.MUtil;
 import com.massivecraft.massivecore.util.ReflectionUtil;
+import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.entity.Player;
@@ -1512,7 +1512,7 @@ public enum ParticleEffect {
 			}
 			String worldName = center.getWorld().getName();
 			double squared = range * range;
-			for (Player player : MUtil.getOnlinePlayers()) {
+			for (Player player : Bukkit.getOnlinePlayers()) {
 				if (!player.getWorld().getName().equals(worldName) || player.getLocation().distanceSquared(center) > squared) {
 					continue;
 				}

src/com/massivecraft/massivecore/util/BoardUtil.java

@@ -145,7 +145,7 @@ public class BoardUtil extends Engine
 		Map<String, Player> players = new MassiveMap<>();
 		
 		// Fill
-		for (Player player : MUtil.getOnlinePlayers())
+		for (Player player : Bukkit.getOnlinePlayers())
 		{
 			players.put(player.getName(), player);
 		}

src/com/massivecraft/massivecore/util/IdUtil.java

@@ -181,7 +181,7 @@ public class IdUtil implements Listener, Runnable
 		Set<CommandSender> ret = new MassiveSet<>();
 		
 		// Add Online Players
-		ret.addAll(MUtil.getOnlinePlayers());
+		ret.addAll(Bukkit.getOnlinePlayers());
 		
 		// Add Console
 		ret.add(getConsole());
@@ -461,7 +461,7 @@ public class IdUtil implements Listener, Runnable
 	public static IdData getData(Object senderObject)
 	{
 		// Null Return
-		if (senderObject == null) return null;
+		if (senderObject == null) throw new NullPointerException("senderObject");
 		
 		// Already Done
 		if (senderObject instanceof IdData) return (IdData) senderObject;
@@ -525,7 +525,7 @@ public class IdUtil implements Listener, Runnable
 	public static CommandSender getSender(Object senderObject)
 	{
 		// Null Return
-		if (senderObject == null) return null;
+		if (senderObject == null) throw new NullPointerException("senderObject");
 		
 		// Already Done
 		if (senderObject instanceof CommandSender) return (CommandSender) senderObject;
@@ -590,7 +590,7 @@ public class IdUtil implements Listener, Runnable
 	public static UUID getUuid(Object senderObject)
 	{
 		// Null Return
-		if (senderObject == null) return null;
+		if (senderObject == null) throw new NullPointerException("senderObject");
 		
 		// Already Done
 		if (senderObject instanceof UUID) return (UUID)senderObject;
@@ -655,7 +655,7 @@ public class IdUtil implements Listener, Runnable
 	public static String getId(Object senderObject)
 	{
 		// Null Return
-		if (senderObject == null) return null;
+		if (senderObject == null) throw new NullPointerException("senderObject");
 		
 		// Already Done
 		if (senderObject instanceof String && MUtil.isUuid((String)senderObject)) return (String)senderObject;
@@ -731,7 +731,7 @@ public class IdUtil implements Listener, Runnable
 	public static String getName(Object senderObject)
 	{
 		// Null Return
-		if (senderObject == null) return null;
+		if (senderObject == null) throw new NullPointerException("senderObject");
 		
 		// Already Done
 		// Handled at "Data" (not applicable - names can look differently)
@@ -780,7 +780,7 @@ public class IdUtil implements Listener, Runnable
 	public static OfflinePlayer getOfflinePlayer(Object senderObject)
 	{
 		// Null Return
-		if (senderObject == null) return null;
+		if (senderObject == null) throw new NullPointerException("senderObject");
 
 		// Already done
 		if (senderObject instanceof OfflinePlayer) return (OfflinePlayer) senderObject;
@@ -965,7 +965,7 @@ public class IdUtil implements Listener, Runnable
 		
 		long millis = System.currentTimeMillis();
 		
-		for (Player player : MUtil.getOnlinePlayers())
+		for (Player player : Bukkit.getOnlinePlayers())
 		{
 			String id = getId(player);
 			if (id == null) throw new NullPointerException("id");

src/com/massivecraft/massivecore/util/MUtil.java

@@ -56,7 +56,6 @@ import org.bukkit.potion.PotionEffect;
 import org.bukkit.potion.PotionEffectType;
 import org.bukkit.projectiles.ProjectileSource;
 
-import java.lang.reflect.Method;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
 import java.net.InetAddress;
@@ -81,99 +80,17 @@ import java.util.regex.Pattern;
 
 public class MUtil
 {
-	// -------------------------------------------- //
-	// CONSTANTS
-	// -------------------------------------------- //
-	
-	private static Method methodGetOnlinePlayers;
-	
-	static
-	{
-		methodGetOnlinePlayers = getMethodGetOnlinePlayers();
-	}
-
 	// -------------------------------------------- //
 	// GET ONLINE PLAYERS
 	// -------------------------------------------- //
-	// It seems we can not always trust the Bukkit.getOnlinePlayers() method.
+	// Old thing that had to do with the converfrion from 1.17 to 1.8
-	// Due to compilation issue this method might not exist in the form we compiled against.
-	// Spigot 1.8 and the 1.7 Bukkit might have been compiled slightly differently resulting in this issue.
-	// Issue Example: https://github.com/MassiveCraft/MassiveCore/issues/192
-	
-	public static Method getMethodGetOnlinePlayers()
-	{
-		Method ret = null;
-		
-		try
-		{
-			for (Method method : Bukkit.class.getDeclaredMethods())
-			{
-				// The method name must be getOnlinePlayers ...
-				if ( ! method.getName().equals("getOnlinePlayers")) continue;
-				
-				// ... if we find such a method it's better than nothing ...
-				if (ret == null) ret = method;
-				
-				// ... but if the method additionally returns a collection ...
-				if ( ! method.getReturnType().isAssignableFrom(Collection.class)) continue;
-				
-				// ... that is preferable ...
-				ret = method;
-				
-				// ... and we need not look any further.
-				break;
-			}
-			
-			ret.setAccessible(true);
-		}
-		catch (Exception e)
-		{
-			// If we fail we do so silently.
-			// This method is probably almost never going to be used anyways.
-		}
-		
-		return ret;
-	}
 
+	@Deprecated
 	public static Collection<Player> getOnlinePlayers()
 	{
-		// Fetch some kind of playersObject.
+		Collection<? extends Player>coll = Bukkit.getOnlinePlayers();
-		Object playersObject = null;
+		List<Player> ret = new MassiveList<>(coll.size());
-		try
+		return ret;
-		{
-			playersObject = Bukkit.getOnlinePlayers();
-		}
-		catch (Throwable t)
-		{
-			// That didn't work!
-			// We probably just caught a NoSuchMethodError.
-			// So let's try with reflection instead.
-			try
-			{
-				playersObject = methodGetOnlinePlayers.invoke(null);
-			}
-			catch (Exception e)
-			{
-				e.printStackTrace();
-			}
-		}
-		
-		// Now return the playersObject.
-		if (playersObject instanceof Collection<?>)
-		{
-			@SuppressWarnings("unchecked")
-			Collection<Player> playersCollection = (Collection<Player>)playersObject;
-			return playersCollection;
-		}
-		else if (playersObject instanceof Player[])
-		{
-			Player[] playersArray = (Player[])playersObject;
-			return Arrays.asList(playersArray);
-		}
-		else
-		{
-			throw new RuntimeException("Failed retrieving online players.");
-		}
 	}
 	
 	// -------------------------------------------- //
@@ -195,7 +112,7 @@ public class MUtil
 		// Fill
 		final World world = location.getWorld();
 		final double radiusSquared = radius * radius;
-		for (Player player : MUtil.getOnlinePlayers())
+		for (Player player : Bukkit.getOnlinePlayers())
 		{
 			Location playerLocation = player.getLocation();
 			World playerWorld = playerLocation.getWorld();
@@ -251,7 +168,7 @@ public class MUtil
 	public static UUID asUuid(String string)
 	{
 		// Null
-		if (string == null) return null;
+		if (string == null) throw new NullPointerException("string");
 		
 		// Avoid Exception
 		if (string.length() != 36) return null;
@@ -285,7 +202,7 @@ public class MUtil
 	
 	public static boolean containsCommand(String needle, Iterable<String> haystack)
 	{
-		if (needle == null) return false;
+		if (needle == null) throw new NullPointerException("needle");
 		needle = prepareCommand(needle);
 		
 		for (String straw : haystack)
@@ -314,7 +231,7 @@ public class MUtil
 	
 	private static String prepareCommand(String string)
 	{
-		if (string == null) return null;
+		if (string == null) throw new NullPointerException("string");
 		string = Txt.removeLeadingCommandDust(string);
 		string = string.toLowerCase();
 		string = string.trim();
@@ -384,6 +301,8 @@ public class MUtil
 	
 	public static boolean isNpc(Object object)
 	{
+		if (object == null) throw new NullPointerException("object");
+
 		if ( ! (object instanceof Metadatable)) return false;
 		Metadatable metadatable = (Metadatable)object;
 		try
@@ -405,6 +324,8 @@ public class MUtil
 	
 	public static boolean isSender(Object object)
 	{
+		if (object == null) throw new NullPointerException("object");
+
 		if (!(object instanceof CommandSender)) return false;
 		if (isNpc(object)) return false;
 		return true;
@@ -416,6 +337,8 @@ public class MUtil
 	
 	public static boolean isPlayer(Object object)
 	{
+		if (object == null) throw new NullPointerException("object");
+
 		if (!(object instanceof Player)) return false;
 		if (isNpc(object)) return false;
 		return true;
@@ -953,7 +876,7 @@ public class MUtil
 	
 	public static <T> T regexPickFirstVal(String input, Map<String, T> regex2val)
 	{
-		if (regex2val == null) return null;
+		if (regex2val == null) throw new NullPointerException("regex2val");
 		T ret = null;
 		
 		for (Entry<String, T> entry : regex2val.entrySet())
@@ -969,7 +892,7 @@ public class MUtil
 	
 	public static <E, T> T equalsPickFirstVal(E input, Map<E, T> thing2val)
 	{
-		if (thing2val == null) return null;
+		if (thing2val == null) throw new NullPointerException("thing2val");
 		T ret = null;
 		
 		for (Entry<E, T> entry : thing2val.entrySet())

src/com/massivecraft/massivecore/util/PermissionUtil.java

@@ -83,7 +83,7 @@ public class PermissionUtil
 	
 	public static String asPermissionId(Object object)
 	{
-		if (object == null) return null;
+		if (object == null) throw new NullPointerException("object");
 		
 		if (object instanceof String) return (String)object;
 		if (object instanceof Identified) return ((Identified)object).getId();
@@ -94,7 +94,7 @@ public class PermissionUtil
 	
 	public static Permission asPermission(Object object)
 	{
-		if (object == null) return null;
+		if (object == null) throw new NullPointerException("object");
 		
 		if (object instanceof Permission) return (Permission)object;
 		
@@ -228,6 +228,8 @@ public class PermissionUtil
 	
 	public static boolean setPermissionStandardChildren(Permission permission, PermissionDefault standard, Map<String, Boolean> children)
 	{
+		if (permission == null) throw new NullPointerException("permission");
+
 		boolean childrenChanged = false;
 		boolean standardChanged = false;
 		

src/com/massivecraft/massivecore/util/PlayerUtil.java

@@ -64,7 +64,7 @@ public class PlayerUtil extends Engine
 	
 	public static void setLastMoveMillis(Player player, long millis)
 	{
-		if (player == null) return;
+		if (player == null) throw new NullPointerException("player");
 		idToLastMoveMillis.put(player.getUniqueId(), millis);
 	}
 	
@@ -94,7 +94,7 @@ public class PlayerUtil extends Engine
 	
 	public static long getLastMoveMillis(Player player)
 	{
-		if (player == null) return 0;
+		if (player == null) throw new NullPointerException("player");
 		Long ret = idToLastMoveMillis.get(player.getUniqueId());
 		if (ret == null) return 0;
 		return ret;
@@ -102,7 +102,7 @@ public class PlayerUtil extends Engine
 	
 	public static long getStandStillMillis(Player player)
 	{
-		if (player == null) return 0;
+		if (player == null) throw new NullPointerException("player");
 		if (player.isDead()) return 0;
 		if (!player.isOnline()) return 0;
 		
@@ -122,8 +122,8 @@ public class PlayerUtil extends Engine
 	
 	public static void setLastDamageMillis(Player player, long millis)
 	{
+		if (player == null) throw new NullPointerException("player");
 		if (MUtil.isntPlayer(player)) return;
-		if (player == null) return;
 		idToLastDamageMillis.put(player.getUniqueId(), millis);
 	}
 	
@@ -157,6 +157,7 @@ public class PlayerUtil extends Engine
 	
 	public static long getLastDamageMillis(Player player)
 	{
+		if (player == null) throw new NullPointerException("player");
 		if (MUtil.isntPlayer(player)) return 0;
 		Long ret = idToLastDamageMillis.get(player.getUniqueId());
 		if (ret == null) return 0;
@@ -165,6 +166,7 @@ public class PlayerUtil extends Engine
 	
 	public static long getNoDamageMillis(Player player)
 	{
+		if (player == null) throw new NullPointerException("player");
 		if (MUtil.isntPlayer(player)) return 0;
 		if (player.isDead()) return 0;
 		if (!player.isOnline()) return 0;

src/com/massivecraft/massivecore/util/SmokeUtil.java

@@ -34,7 +34,7 @@ public class SmokeUtil
 	// Single ========
 	public static void spawnSingle(Location location, int direction)
 	{
-		if (location == null) return;
+		if (location == null) throw new NullPointerException("location");
 		location.getWorld().playEffect(location, Effect.SMOKE, direction);
 	}
 	

src/com/massivecraft/massivecore/util/TimeUnit.java

@@ -70,7 +70,7 @@ public class TimeUnit implements Comparable<TimeUnit>
 	
 	public static TimeUnit get(String timeUnitString)
 	{
-		if (timeUnitString == null) return null;
+		if (timeUnitString == null) throw new NullPointerException("timeUnitString");
 		String timeUnitStringLowerCase = timeUnitString.toLowerCase(); 
 		for (TimeUnit timeUnit : all)
 		{

src/com/massivecraft/massivecore/util/Txt.java

@@ -170,7 +170,7 @@ public class Txt
 	
 	public static String parse(String string)
 	{
-		if (string == null) return null;
+		if (string == null) throw new NullPointerException("string");
 		StringBuffer ret = new StringBuffer();
 		Matcher matcher = parsePattern.matcher(string);
 		while (matcher.find())
@@ -202,7 +202,7 @@ public class Txt
 	
 	public static ArrayList<String> wrap(final String string)
 	{
-		if (string == null) return null;
+		if (string == null) throw new NullPointerException("string");
 		return new ArrayList<>(Arrays.asList(PATTERN_NEWLINE.split(string)));
 	}
 	
@@ -245,13 +245,13 @@ public class Txt
 	
 	public static String upperCaseFirst(String string)
 	{
-		if (string == null) return null;
+		if (string == null) throw new NullPointerException("string");
 		if (string.length() == 0) return string;
 		return string.substring(0, 1).toUpperCase() + string.substring(1);
 	}
 	public static String lowerCaseFirst(String string)
 	{
-		if (string == null) return null;
+		if (string == null) throw new NullPointerException("string");
 		if (string.length() == 0) return string;
 		return string.substring(0, 1).toLowerCase() + string.substring(1);
 	}
@@ -392,7 +392,8 @@ public class Txt
 	
 	public static boolean isVowel(String str)
 	{
-		if (str == null || str.length() == 0) return false;
+		if (str == null) throw new NullPointerException("str");
+		if (str.length() == 0) return false;
 		return vowel.contains(str.substring(0, 1));
 	}
 	
@@ -782,7 +783,7 @@ public class Txt
 	
 	public static String removeSmartQuotes(String string)
 	{
-		if (string == null) return null;
+		if (string == null) throw new NullPointerException("string");
 		
 		// LEFT SINGLE QUOTATION MARK
 		string = string.replace("\u2018", "'");