Some minor improvements from static analysis

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/FireworkEffect.java

@@ -356,9 +356,6 @@ public final class FireworkEffect implements ConfigurationSerializable {
      */
     public static ConfigurationSerializable deserialize(Map<String, Object> map) {
         Type type = Type.valueOf((String) map.get(TYPE));
-        if (type == null) {
-            throw new IllegalArgumentException(map.get(TYPE) + " is not a valid Type");
-        }
 
         return builder()
             .flicker((Boolean) map.get(FLICKER))

paper-api/src/main/java/org/bukkit/command/FormattedCommandAlias.java

@@ -1,13 +1,8 @@
 package org.bukkit.command;
 
 import java.util.ArrayList;
-import java.util.logging.Level;
 
 import org.bukkit.Bukkit;
-import org.bukkit.entity.Player;
-import org.bukkit.event.player.PlayerCommandPreprocessEvent;
-import org.bukkit.event.server.RemoteServerCommandEvent;
-import org.bukkit.event.server.ServerCommandEvent;
 
 public class FormattedCommandAlias extends Command {
     private final String[] formatStrings;
@@ -42,13 +37,13 @@ public class FormattedCommandAlias extends Command {
     }
 
     private String buildCommand(String formatString, String[] args) {
-        int index = formatString.indexOf("$");
+        int index = formatString.indexOf('$');
         while (index != -1) {
             int start = index;
 
             if (index > 0 && formatString.charAt(start - 1) == '\\') {
                 formatString = formatString.substring(0, start - 1) + formatString.substring(start);
-                index = formatString.indexOf("$", index);
+                index = formatString.indexOf('$', index);
                 continue;
             }
 
@@ -72,7 +67,7 @@ public class FormattedCommandAlias extends Command {
                 throw new IllegalArgumentException("Invalid replacement token");
             }
 
-            int position = Integer.valueOf(formatString.substring(argStart, index));
+            int position = Integer.parseInt(formatString.substring(argStart, index));
 
             // Arguments are not 0 indexed
             if (position == 0) {
@@ -112,7 +107,7 @@ public class FormattedCommandAlias extends Command {
             index = start + replacement.length();
 
             // Move to the next replacement token
-            index = formatString.indexOf("$", index);
+            index = formatString.indexOf('$', index);
         }
 
         return formatString;

paper-api/src/main/java/org/bukkit/command/SimpleCommandMap.java

@@ -225,13 +225,14 @@ public class SimpleCommandMap implements CommandMap {
     public void registerServerAliases() {
         Map<String, String[]> values = server.getCommandAliases();
 
-        for (String alias : values.keySet()) {
+        for (Map.Entry<String, String[]> entry : values.entrySet()) {
+            String alias = entry.getKey();
             if (alias.contains(" ")) {
                 server.getLogger().warning("Could not register alias " + alias + " because it contains illegal characters");
                 continue;
             }
 
-            String[] commandStrings = values.get(alias);
+            String[] commandStrings = entry.getValue();
             List<String> targets = new ArrayList<String>();
             StringBuilder bad = new StringBuilder();
 

paper-api/src/main/java/org/bukkit/event/block/BlockFormEvent.java

@@ -2,7 +2,6 @@ package org.bukkit.event.block;
 
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockState;
-import org.bukkit.event.Cancellable;
 import org.bukkit.event.HandlerList;
 
 /**
@@ -23,7 +22,7 @@ import org.bukkit.event.HandlerList;
  *
  * @see BlockSpreadEvent
  */
-public class BlockFormEvent extends BlockGrowEvent implements Cancellable {
+public class BlockFormEvent extends BlockGrowEvent {
     private static final HandlerList handlers = new HandlerList();
 
     public BlockFormEvent(final Block block, final BlockState newState) {

paper-api/src/main/java/org/bukkit/help/GenericCommandHelpTopic.java

@@ -5,8 +5,6 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.apache.commons.lang.StringUtils;
 import org.bukkit.command.ConsoleCommandSender;
-import org.bukkit.command.PluginCommand;
-import org.bukkit.help.HelpTopic;
 
 /**
  * Lacking an alternative, the help system will create instances of
@@ -28,7 +26,7 @@ public class GenericCommandHelpTopic extends HelpTopic {
         }
 
         // The short text is the first line of the description
-        int i = command.getDescription().indexOf("\n");
+        int i = command.getDescription().indexOf('\n');
         if (i > 1) {
             shortText = command.getDescription().substring(0, i - 1);
         } else {
@@ -36,7 +34,7 @@ public class GenericCommandHelpTopic extends HelpTopic {
         }
 
         // Build full text
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
 
         sb.append(ChatColor.GOLD);
         sb.append("Description: ");

paper-api/src/main/java/org/bukkit/help/HelpTopicComparator.java

@@ -1,7 +1,5 @@
 package org.bukkit.help;
 
-import org.bukkit.help.HelpTopic;
-
 import java.util.Comparator;
 
 /**
@@ -11,18 +9,18 @@ import java.util.Comparator;
  * slash come after topics that don't.
  */
 public class HelpTopicComparator implements Comparator<HelpTopic> {
-    
+
     // Singleton implementations
     private static final TopicNameComparator tnc = new TopicNameComparator();
     public static TopicNameComparator topicNameComparatorInstance() {
         return tnc;
     }
-    
+
     private static final HelpTopicComparator htc = new HelpTopicComparator();
     public static HelpTopicComparator helpTopicComparatorInstance() {
         return htc;
     }
-    
+
     private HelpTopicComparator() {}
 
     public int compare(HelpTopic lhs, HelpTopic rhs) {
@@ -31,11 +29,11 @@ public class HelpTopicComparator implements Comparator<HelpTopic> {
 
     public static class TopicNameComparator implements Comparator<String> {
         private TopicNameComparator(){}
-        
+
         public int compare(String lhs, String rhs) {
             boolean lhsStartSlash = lhs.startsWith("/");
             boolean rhsStartSlash = rhs.startsWith("/");
-            
+
             if (lhsStartSlash && !rhsStartSlash) {
                 return 1;
             } else if (!lhsStartSlash && rhsStartSlash) {

paper-api/src/main/java/org/bukkit/material/Vine.java

@@ -14,7 +14,7 @@ public class Vine extends MaterialData {
     private static final int VINE_EAST = 0x8;
     private static final int VINE_WEST = 0x2;
     private static final int VINE_SOUTH = 0x1;
-    EnumSet<BlockFace> possibleFaces = EnumSet.of(BlockFace.WEST, BlockFace.NORTH, BlockFace.SOUTH, BlockFace.EAST);
+    private static final EnumSet<BlockFace> possibleFaces = EnumSet.of(BlockFace.WEST, BlockFace.NORTH, BlockFace.SOUTH, BlockFace.EAST);
 
     public Vine() {
         super(Material.VINE);

paper-api/src/main/java/org/bukkit/metadata/LazyMetadataValue.java

@@ -17,7 +17,7 @@ import org.bukkit.plugin.Plugin;
  * level. Once invalidated, the LazyMetadataValue will recompute its value
  * when asked.
  */
-public class LazyMetadataValue extends MetadataValueAdapter implements MetadataValue {
+public class LazyMetadataValue extends MetadataValueAdapter {
     private Callable<Object> lazyValue;
     private CacheStrategy cacheStrategy;
     private SoftReference<Object> internalValue;

paper-api/src/main/java/org/bukkit/permissions/PermissibleBase.java

@@ -176,11 +176,11 @@ public class PermissibleBase implements Permissible {
     }
 
     private void calculateChildPermissions(Map<String, Boolean> children, boolean invert, PermissionAttachment attachment) {
-        Set<String> keys = children.keySet();
+        for (Map.Entry<String, Boolean> entry : children.entrySet()) {
+            String name = entry.getKey();
 
-        for (String name : keys) {
             Permission perm = Bukkit.getServer().getPluginManager().getPermission(name);
-            boolean value = children.get(name) ^ invert;
+            boolean value = entry.getValue() ^ invert;
             String lname = name.toLowerCase(java.util.Locale.ENGLISH);
 
             permissions.put(lname, new PermissionAttachmentInfo(parent, lname, attachment, value));
@@ -232,7 +232,7 @@ public class PermissibleBase implements Permissible {
         return new HashSet<PermissionAttachmentInfo>(permissions.values());
     }
 
-    private class RemoveAttachmentRunnable implements Runnable {
+    private static class RemoveAttachmentRunnable implements Runnable {
         private PermissionAttachment attachment;
 
         public RemoveAttachmentRunnable(PermissionAttachment attachment) {

paper-api/src/main/java/org/bukkit/plugin/SimplePluginManager.java

@@ -42,7 +42,7 @@ public final class SimplePluginManager implements PluginManager {
     private final Map<Pattern, PluginLoader> fileAssociations = new HashMap<Pattern, PluginLoader>();
     private final List<Plugin> plugins = new ArrayList<Plugin>();
     private final Map<String, Plugin> lookupNames = new HashMap<String, Plugin>();
-    private static File updateDirectory = null;
+    private File updateDirectory;
     private final SimpleCommandMap commandMap;
     private final Map<String, Permission> permissions = new HashMap<String, Permission>();
     private final Map<Boolean, Set<Permission>> defaultPerms = new LinkedHashMap<Boolean, Set<Permission>>();
@@ -187,10 +187,11 @@ public final class SimplePluginManager implements PluginManager {
 
         while (!plugins.isEmpty()) {
             boolean missingDependency = true;
-            Iterator<String> pluginIterator = plugins.keySet().iterator();
+            Iterator<Map.Entry<String, File>> pluginIterator = plugins.entrySet().iterator();
 
             while (pluginIterator.hasNext()) {
-                String plugin = pluginIterator.next();
+                Map.Entry<String, File> entry = pluginIterator.next();
+                String plugin = entry.getKey();
 
                 if (dependencies.containsKey(plugin)) {
                     Iterator<String> dependencyIterator = dependencies.get(plugin).iterator();
@@ -205,14 +206,13 @@ public final class SimplePluginManager implements PluginManager {
                         // We have a dependency not found
                         } else if (!plugins.containsKey(dependency)) {
                             missingDependency = false;
-                            File file = plugins.get(plugin);
                             pluginIterator.remove();
                             softDependencies.remove(plugin);
                             dependencies.remove(plugin);
 
                             server.getLogger().log(
                                 Level.SEVERE,
-                                "Could not load '" + file.getPath() + "' in folder '" + directory.getPath() + "'",
+                                "Could not load '" + entry.getValue().getPath() + "' in folder '" + directory.getPath() + "'",
                                 new UnknownDependencyException(dependency));
                             break;
                         }
@@ -257,15 +257,16 @@ public final class SimplePluginManager implements PluginManager {
             if (missingDependency) {
                 // We now iterate over plugins until something loads
                 // This loop will ignore soft dependencies
-                pluginIterator = plugins.keySet().iterator();
+                pluginIterator = plugins.entrySet().iterator();
 
                 while (pluginIterator.hasNext()) {
-                    String plugin = pluginIterator.next();
+                    Map.Entry<String, File> entry = pluginIterator.next();
+                    String plugin = entry.getKey();
 
                     if (!dependencies.containsKey(plugin)) {
                         softDependencies.remove(plugin);
                         missingDependency = false;
-                        File file = plugins.get(plugin);
+                        File file = entry.getValue();
                         pluginIterator.remove();
 
                         try {
@@ -358,7 +359,7 @@ public final class SimplePluginManager implements PluginManager {
     }
 
     public synchronized Plugin[] getPlugins() {
-        return plugins.toArray(new Plugin[0]);
+        return plugins.toArray(new Plugin[plugins.size()]);
     }
 
     /**

paper-api/src/main/java/org/bukkit/plugin/messaging/StandardMessenger.java

@@ -68,7 +68,7 @@ public class StandardMessenger implements Messenger {
             Set<String> channels = outgoingByPlugin.get(plugin);
 
             if (channels != null) {
-                String[] toRemove = channels.toArray(new String[0]);
+                String[] toRemove = channels.toArray(new String[channels.size()]);
 
                 outgoingByPlugin.remove(plugin);
 
@@ -138,7 +138,7 @@ public class StandardMessenger implements Messenger {
             Set<PluginMessageListenerRegistration> registrations = incomingByPlugin.get(plugin);
 
             if (registrations != null) {
-                PluginMessageListenerRegistration[] toRemove = registrations.toArray(new PluginMessageListenerRegistration[0]);
+                PluginMessageListenerRegistration[] toRemove = registrations.toArray(new PluginMessageListenerRegistration[registrations.size()]);
 
                 for (PluginMessageListenerRegistration registration : toRemove) {
                     if (registration.getChannel().equals(channel)) {
@@ -154,7 +154,7 @@ public class StandardMessenger implements Messenger {
             Set<PluginMessageListenerRegistration> registrations = incomingByPlugin.get(plugin);
 
             if (registrations != null) {
-                PluginMessageListenerRegistration[] toRemove = registrations.toArray(new PluginMessageListenerRegistration[0]);
+                PluginMessageListenerRegistration[] toRemove = registrations.toArray(new PluginMessageListenerRegistration[registrations.size()]);
 
                 incomingByPlugin.remove(plugin);
 

paper-api/src/main/java/org/bukkit/potion/Potion.java

@@ -345,10 +345,10 @@ public class Potion {
             level++;
             potion = new Potion(type, level);
         }
-        if ((damage & SPLASH_BIT) > 0) {
+        if ((damage & SPLASH_BIT) != 0) {
             potion = potion.splash();
         }
-        if ((damage & EXTENDED_BIT) > 0) {
+        if ((damage & EXTENDED_BIT) != 0) {
             potion = potion.extend();
         }
         return potion;

paper-api/src/main/java/org/bukkit/util/NumberConversions.java

@@ -30,7 +30,7 @@ public final class NumberConversions {
         }
 
         try {
-            return Integer.valueOf(object.toString());
+            return Integer.parseInt(object.toString());
         } catch (NumberFormatException e) {
         } catch (NullPointerException e) {
         }
@@ -43,7 +43,7 @@ public final class NumberConversions {
         }
 
         try {
-            return Float.valueOf(object.toString());
+            return Float.parseFloat(object.toString());
         } catch (NumberFormatException e) {
         } catch (NullPointerException e) {
         }
@@ -56,7 +56,7 @@ public final class NumberConversions {
         }
 
         try {
-            return Double.valueOf(object.toString());
+            return Double.parseDouble(object.toString());
         } catch (NumberFormatException e) {
         } catch (NullPointerException e) {
         }
@@ -69,7 +69,7 @@ public final class NumberConversions {
         }
 
         try {
-            return Long.valueOf(object.toString());
+            return Long.parseLong(object.toString());
         } catch (NumberFormatException e) {
         } catch (NullPointerException e) {
         }
@@ -82,7 +82,7 @@ public final class NumberConversions {
         }
 
         try {
-            return Short.valueOf(object.toString());
+            return Short.parseShort(object.toString());
         } catch (NumberFormatException e) {
         } catch (NullPointerException e) {
         }
@@ -95,7 +95,7 @@ public final class NumberConversions {
         }
 
         try {
-            return Byte.valueOf(object.toString());
+            return Byte.parseByte(object.toString());
         } catch (NumberFormatException e) {
         } catch (NullPointerException e) {
         }

paper-api/src/main/java/org/bukkit/util/noise/SimplexNoiseGenerator.java

@@ -41,7 +41,7 @@ public class SimplexNoiseGenerator extends PerlinNoiseGenerator {
         {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0},
         {2, 0, 1, 3}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {3, 0, 1, 2}, {3, 0, 2, 1}, {0, 0, 0, 0}, {3, 1, 2, 0},
         {2, 1, 0, 3}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {3, 1, 0, 2}, {0, 0, 0, 0}, {3, 2, 0, 1}, {3, 2, 1, 0}};
-    protected static double offsetW;
+    protected double offsetW;
     private static final SimplexNoiseGenerator instance = new SimplexNoiseGenerator();
 
     protected SimplexNoiseGenerator() {

paper-api/src/test/java/org/bukkit/conversations/ConversationTest.java

@@ -27,7 +27,7 @@ public class ConversationTest {
         assertEquals("SecondPrompt", forWhom.lastSentMessage);
         assertEquals(conversation, forWhom.abandonedConverstion);
     }
-    
+
     @Test
     public void testConversationFactory() {
         FakeConversable forWhom = new FakeConversable();
@@ -75,7 +75,6 @@ public class ConversationTest {
     @Test
     public void testNotPlayer() {
         FakeConversable forWhom = new FakeConversable();
-        NullConversationPrefix prefix = new NullConversationPrefix();
         ConversationFactory factory = new ConversationFactory(null)
                 .thatExcludesNonPlayersWithMessage("bye");
         Conversation conversation = factory.buildConversation(forWhom);