SpigotCore_Main/build.gradle

@@ -40,6 +40,16 @@ sourceSets {
             exclude '**/*.java', '**/*.kt'
         }
     }
+
+    test {
+        java {
+            srcDirs = ['testsrc']
+        }
+        resources {
+            srcDirs = ['testsrc']
+            exclude '**/*.java', '**/*.kt'
+        }
+    }
 }
 
 dependencies {
@@ -51,6 +61,12 @@ dependencies {
     testCompileOnly 'org.projectlombok:lombok:1.18.22'
     annotationProcessor 'org.projectlombok:lombok:1.18.22'
     testAnnotationProcessor 'org.projectlombok:lombok:1.18.22'
+
+    testImplementation files("${project.rootDir}/lib/Spigot-1.15.jar")
+    testImplementation files("${project.rootDir}/lib/WorldEdit-1.12.jar")
+
+    testImplementation 'junit:junit:4.13.2'
+    testImplementation 'org.hamcrest:hamcrest:2.2'
 }
 
 processResources {

SpigotCore_Main/src/de/steamwar/command/CommandParseException.java

@@ -19,7 +19,7 @@
 
 package de.steamwar.command;
 
-public class CommandParseException extends Exception {
+public class CommandParseException extends RuntimeException {
 
     public CommandParseException() {
     }

SpigotCore_Main/src/de/steamwar/command/CommandPart.java

@@ -0,0 +1,217 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.command;
+
+import lombok.AllArgsConstructor;
+import lombok.Setter;
+import lombok.ToString;
+import org.bukkit.command.CommandSender;
+
+import java.lang.reflect.Array;
+import java.util.Arrays;
+import java.util.List;
+
+@ToString
+public class CommandPart {
+    private static final String[] EMPTY_ARRAY = new String[0];
+
+    @AllArgsConstructor
+    private static class CheckArgumentResult {
+        private final boolean success;
+        private final Object value;
+    }
+
+    private TypeMapper<?> typeMapper;
+    private GuardChecker guard;
+    private Class<?> varArgType;
+    private String optional;
+    private GuardCheckType guardCheckType;
+
+    private CommandPart next = null;
+
+    @Setter
+    private boolean ignoreAsArgument = false;
+
+    public CommandPart(TypeMapper<?> typeMapper, GuardChecker guard, Class<?> varArgType, String optional, GuardCheckType guardCheckType) {
+        this.typeMapper = typeMapper;
+        this.guard = guard;
+        this.varArgType = varArgType;
+        this.optional = optional;
+        this.guardCheckType = guardCheckType;
+
+        validatePart();
+    }
+
+    public void setNext(CommandPart next) {
+        if (varArgType != null) {
+            throw new IllegalArgumentException("There can't be a next part if this is a vararg part!");
+        }
+        this.next = next;
+    }
+
+    private void validatePart() {
+        if (guardCheckType == GuardCheckType.TAB_COMPLETE) {
+            throw new IllegalArgumentException("Tab complete is not allowed as a guard check type!");
+        }
+        if (optional != null && varArgType != null) {
+            throw new IllegalArgumentException("A vararg part can't have an optional part!");
+        }
+
+        if (optional != null) {
+            try {
+                typeMapper.map(null, EMPTY_ARRAY, optional);
+            } catch (Exception e) {
+                throw new IllegalArgumentException("The optional part is not valid!");
+            }
+        }
+    }
+
+    public void generateArgumentArray(List<Object> current, CommandSender commandSender, String[] args, int startIndex) {
+        if (startIndex >= args.length && varArgType == null) {
+            throw new CommandParseException();
+        }
+
+        if (varArgType != null) {
+            Object array = Array.newInstance(varArgType, args.length - startIndex);
+            for (int i = startIndex; i < args.length; i++) {
+                CheckArgumentResult validArgument = checkArgument(null, commandSender, args, i);
+                if (!validArgument.success) {
+                    throw new CommandParseException();
+                }
+                Array.set(array, i - startIndex, validArgument.value);
+            }
+            current.add(array);
+            return;
+        }
+
+        CheckArgumentResult validArgument = checkArgument(null, commandSender, args, startIndex);
+        if (!validArgument.success && optional == null) {
+            throw new CommandParseException();
+        }
+        if (!validArgument.success) {
+            if (!ignoreAsArgument) {
+                current.add(typeMapper.map(commandSender, EMPTY_ARRAY, optional));
+            }
+            if (next != null) {
+                next.generateArgumentArray(current, commandSender, args, startIndex);
+            }
+            return;
+        }
+        if (!ignoreAsArgument) {
+            current.add(validArgument.value);
+        }
+        if (next != null) {
+            next.generateArgumentArray(current, commandSender, args, startIndex + 1);
+        }
+    }
+
+    public boolean guardCheck(CommandSender commandSender, String[] args, int startIndex) {
+        if (varArgType != null) {
+            for (int i = startIndex; i < args.length; i++) {
+                GuardResult guardResult = checkGuard(guardCheckType, commandSender, args, i);
+                if (guardResult == GuardResult.DENIED) {
+                    throw new CommandNoHelpException();
+                }
+                if (guardResult == GuardResult.DENIED_WITH_HELP) {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        GuardResult guardResult = checkGuard(guardCheckType, commandSender, args, startIndex);
+        if (guardResult == GuardResult.DENIED) {
+            if (optional != null && next != null) {
+                return next.guardCheck(commandSender, args, startIndex);
+            }
+            throw new CommandNoHelpException();
+        }
+        if (guardResult == GuardResult.DENIED_WITH_HELP) {
+            if (optional != null && next != null) {
+                return next.guardCheck(commandSender, args, startIndex);
+            }
+            return false;
+        }
+        if (next != null) {
+            return next.guardCheck(commandSender, args, startIndex + 1);
+        }
+        return true;
+    }
+
+    public void generateTabComplete(List<String> current, CommandSender commandSender, String[] args, int startIndex) {
+        if (varArgType != null) {
+            for (int i = startIndex; i < args.length - 1; i++) {
+                CheckArgumentResult validArgument = checkArgument(null, commandSender, args, i);
+                if (!validArgument.success) {
+                    return;
+                }
+            }
+            List<String> strings = typeMapper.tabCompletes(commandSender, Arrays.copyOf(args, args.length - 1), args[args.length - 1]);
+            if (strings != null) {
+                current.addAll(strings);
+            }
+            return;
+        }
+
+        if (args.length - 1 > startIndex) {
+            CheckArgumentResult checkArgumentResult = checkArgument(GuardCheckType.TAB_COMPLETE, commandSender, args, startIndex);
+            if (checkArgumentResult.success && next != null) {
+                next.generateTabComplete(current, commandSender, args, startIndex + 1);
+            }
+            return;
+        }
+
+        List<String> strings = typeMapper.tabCompletes(commandSender, Arrays.copyOf(args, startIndex), args[startIndex]);
+        if (strings != null) {
+            current.addAll(strings);
+        }
+        if (optional != null && next != null) {
+            next.generateTabComplete(current, commandSender, args, startIndex);
+        }
+    }
+
+    private CheckArgumentResult checkArgument(GuardCheckType guardCheckType, CommandSender commandSender, String[] args, int index) {
+        try {
+            Object value = typeMapper.map(commandSender, Arrays.copyOf(args, index), args[index]);
+            if (value == null) {
+                return new CheckArgumentResult(false, null);
+            }
+            GuardResult guardResult = checkGuard(guardCheckType, commandSender, args, index);
+            switch (guardResult) {
+                case ALLOWED:
+                    return new CheckArgumentResult(true, value);
+                case DENIED:
+                    throw new CommandNoHelpException();
+                case DENIED_WITH_HELP:
+                default:
+                    return new CheckArgumentResult(false, null);
+            }
+        } catch (Exception e) {
+            return new CheckArgumentResult(false, null);
+        }
+    }
+
+    private GuardResult checkGuard(GuardCheckType guardCheckType, CommandSender commandSender, String[] args, int index) {
+        if (guard != null && guardCheckType != null) {
+            return guard.guard(commandSender, guardCheckType, Arrays.copyOf(args, index), args[index]);
+        }
+        return GuardResult.ALLOWED;
+    }
+}

SpigotCore_Main/src/de/steamwar/command/CommandRegistering.java

@@ -0,0 +1,65 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.command;
+
+import lombok.experimental.UtilityClass;
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandMap;
+import org.bukkit.command.SimpleCommandMap;
+
+import java.lang.reflect.Field;
+import java.util.Map;
+
+@UtilityClass
+class CommandRegistering {
+
+    private static final CommandMap commandMap;
+    private static final Map<String, Command> knownCommandMap;
+
+    static {
+        try {
+            final Field commandMapField = Bukkit.getServer().getClass().getDeclaredField("commandMap");
+            commandMapField.setAccessible(true);
+            commandMap = (CommandMap) commandMapField.get(Bukkit.getServer());
+        } catch (NoSuchFieldException | IllegalAccessException exception) {
+            Bukkit.shutdown();
+            throw new SecurityException("Oh shit. Commands cannot be registered.", exception);
+        }
+        try {
+            final Field knownCommandsField = SimpleCommandMap.class.getDeclaredField("knownCommands");
+            knownCommandsField.setAccessible(true);
+            knownCommandMap = (Map<String, Command>) knownCommandsField.get(commandMap);
+        } catch (NoSuchFieldException | IllegalAccessException exception) {
+            Bukkit.shutdown();
+            throw new SecurityException("Oh shit. Commands cannot be registered.", exception);
+        }
+    }
+
+    static void unregister(Command command) {
+        knownCommandMap.remove(command.getName());
+        command.getAliases().forEach(knownCommandMap::remove);
+        command.unregister(commandMap);
+    }
+
+    static void register(Command command) {
+        commandMap.register("steamwar", command);
+    }
+}

SpigotCore_Main/src/de/steamwar/command/SWCommand.java

@@ -61,13 +61,7 @@ public abstract class SWCommand {
                 if (!initialized) {
                     createMapping();
                 }
-                try {
-                    if (!commandList.stream().anyMatch(s -> s.invoke(sender, args))) {
-                        commandHelpList.stream().anyMatch(s -> s.invoke(sender, args));
-                    }
-                } catch (CommandNoHelpException e) {
-                    // Ignored
-                }
+                SWCommand.this.execute(sender, alias, args);
                 return false;
             }
 
@@ -76,21 +70,52 @@ public abstract class SWCommand {
                 if (!initialized) {
                     createMapping();
                 }
-                String string = args[args.length - 1].toLowerCase();
-                return commandList.stream()
-                        .filter(s -> !s.noTabComplete)
-                        .map(s -> s.tabComplete(sender, args))
-                        .filter(Objects::nonNull)
-                        .flatMap(Collection::stream)
-                        .filter(s -> !s.isEmpty())
-                        .filter(s -> s.toLowerCase().startsWith(string))
-                        .collect(Collectors.toList());
+                return SWCommand.this.tabComplete(sender, alias, args);
             }
         };
         unregister();
         register();
     }
 
+    // This is used for the tests!
+    SWCommand(boolean noRegister, String command, String... aliases) {
+        this.command = new Command(command, "", "/" + command, Arrays.asList(aliases)) {
+            @Override
+            public boolean execute(CommandSender sender, String alias, String[] args) {
+                SWCommand.this.execute(sender, alias, args);
+                return false;
+            }
+
+            @Override
+            public List<String> tabComplete(CommandSender sender, String alias, String[] args) throws IllegalArgumentException {
+                return SWCommand.this.tabComplete(sender, alias, args);
+            }
+        };
+        createMapping();
+    }
+
+    void execute(CommandSender sender, String alias, String[] args) {
+        try {
+            if (!commandList.stream().anyMatch(s -> s.invoke(sender, args))) {
+                commandHelpList.stream().anyMatch(s -> s.invoke(sender, args));
+            }
+        } catch (CommandNoHelpException e) {
+            // Ignored
+        }
+    }
+
+    List<String> tabComplete(CommandSender sender, String alias, String[] args) throws IllegalArgumentException {
+        String string = args[args.length - 1].toLowerCase();
+        return commandList.stream()
+                .filter(s -> !s.noTabComplete)
+                .map(s -> s.tabComplete(sender, args))
+                .filter(Objects::nonNull)
+                .flatMap(Collection::stream)
+                .filter(s -> !s.isEmpty())
+                .filter(s -> s.toLowerCase().startsWith(string))
+                .collect(Collectors.toList());
+    }
+
     private synchronized void createMapping() {
         List<Method> methods = methods();
         for (Method method : methods) {
@@ -149,8 +174,7 @@ public abstract class SWCommand {
                 if (compare != 0) {
                     return compare;
                 } else {
-                    return Integer.compare(o1.varArgType != null ? Integer.MAX_VALUE : o1.arguments.length,
-                            o2.varArgType != null ? Integer.MAX_VALUE : o2.arguments.length);
+                    return Integer.compare(o1.comparableValue, o2.comparableValue);
                 }
             });
             commandHelpList.sort((o1, o2) -> {
@@ -219,13 +243,11 @@ public abstract class SWCommand {
     }
 
     public void unregister() {
-        SWCommandUtils.knownCommandMap.remove(command.getName());
-        command.getAliases().forEach(SWCommandUtils.knownCommandMap::remove);
-        command.unregister(SWCommandUtils.commandMap);
+        CommandRegistering.unregister(command);
     }
 
     public void register() {
-        SWCommandUtils.commandMap.register("steamwar", this.command);
+        CommandRegistering.register(command);
     }
 
     @Register(help = true)
@@ -332,6 +354,15 @@ public abstract class SWCommand {
     @Retention(RetentionPolicy.RUNTIME)
     @Target({ElementType.PARAMETER})
     protected @interface StaticValue {
-        String[] value() default {};
+        String[] value();
+    }
+
+    @Retention(RetentionPolicy.RUNTIME)
+    @Target({ElementType.PARAMETER})
+    protected @interface OptionalValue {
+        /**
+         * Will pe parsed against the TypeMapper specified by the parameter or annotation.
+         */
+        String value();
     }
 }

SpigotCore_Main/src/de/steamwar/command/SWCommandUtils.java

@@ -19,20 +19,17 @@
 
 package de.steamwar.command;
 
+import de.steamwar.sql.BauweltMember;
 import de.steamwar.sql.SchematicNode;
 import de.steamwar.sql.SteamwarUser;
 import org.bukkit.Bukkit;
 import org.bukkit.GameMode;
-import org.bukkit.command.Command;
-import org.bukkit.command.CommandMap;
 import org.bukkit.command.CommandSender;
-import org.bukkit.command.SimpleCommandMap;
 import org.bukkit.entity.Player;
 
 import java.lang.annotation.Annotation;
-import java.lang.reflect.Array;
-import java.lang.reflect.Field;
 import java.lang.reflect.Method;
+import java.lang.reflect.Parameter;
 import java.util.*;
 import java.util.function.BiFunction;
 import java.util.function.Function;
@@ -47,15 +44,6 @@ public class SWCommandUtils {
     static final Map<String, TypeMapper<?>> MAPPER_FUNCTIONS = new HashMap<>();
     static final Map<String, GuardChecker> GUARD_FUNCTIONS = new HashMap<>();
 
-    static final TypeMapper<?> ERROR_FUNCTION = createMapper(s -> {
-        throw new SecurityException();
-    }, s -> Collections.emptyList());
-
-    static final BiFunction<Class<Enum<?>>, String, Enum<?>> ENUM_MAPPER = (enumClass, s) -> {
-        Enum<?>[] enums = enumClass.getEnumConstants();
-        return Arrays.stream(enums).filter(e -> e.name().equalsIgnoreCase(s)).findFirst().orElse(null);
-    };
-
     static {
         addMapper(boolean.class, Boolean.class, createMapper(Boolean::parseBoolean, s -> Arrays.asList("true", "false")));
         addMapper(float.class, Float.class, createMapper(numberMapper(Float::parseFloat), numberCompleter(Float::parseFloat)));
@@ -75,13 +63,39 @@ public class SWCommandUtils {
         MAPPER_FUNCTIONS.put(SteamwarUser.class.getTypeName(), createMapper(SteamwarUser::get, s -> Bukkit.getOnlinePlayers().stream().map(Player::getName).collect(Collectors.toList())));
         MAPPER_FUNCTIONS.put(SchematicNode.class.getTypeName(), new TypeMapper<SchematicNode>() {
             @Override
-            public List<String> tabCompletes(CommandSender commandSender, String[] strings, String s) {
-                return SchematicNode.getNodeTabcomplete(SteamwarUser.get(((Player) commandSender).getUniqueId()), s);
+            public SchematicNode map(CommandSender commandSender, String[] previousArguments, String s) {
+                return SchematicNode.getNodeFromPath(SteamwarUser.get(((Player) commandSender).getUniqueId()), s);
             }
 
             @Override
-            public SchematicNode map(CommandSender commandSender, String[] previousArguments, String s) {
-                return SchematicNode.getNodeFromPath(SteamwarUser.get(((Player) commandSender).getUniqueId()), s);
+            public List<String> tabCompletes(CommandSender commandSender, String[] strings, String s) {
+                return SchematicNode.getNodeTabcomplete(SteamwarUser.get(((Player) commandSender).getUniqueId()), s);
+            }
+        });
+        MAPPER_FUNCTIONS.put(BauweltMember.class.getTypeName(), new TypeMapper<BauweltMember>() {
+            @Override
+            public BauweltMember map(CommandSender commandSender, String[] previousArguments, String s) {
+                if (!(commandSender instanceof Player)) {
+                    return null;
+                }
+                Player player = (Player) commandSender;
+                return BauweltMember.getMembers(player.getUniqueId())
+                        .stream()
+                        .filter(member -> SteamwarUser.get(member.getMemberID()).getUserName().equalsIgnoreCase(s))
+                        .findAny()
+                        .orElse(null);
+            }
+
+            @Override
+            public List<String> tabCompletes(CommandSender commandSender, String[] previousArguments, String s) {
+                if (!(commandSender instanceof Player)) {
+                    return new ArrayList<>();
+                }
+                Player player = (Player) commandSender;
+                return BauweltMember.getMembers(player.getUniqueId())
+                        .stream()
+                        .map(m -> SteamwarUser.get(m.getMemberID()).getUserName())
+                        .collect(Collectors.toList());
             }
         });
     }
@@ -91,60 +105,99 @@ public class SWCommandUtils {
         MAPPER_FUNCTIONS.put(alternativeClazz.getTypeName(), mapper);
     }
 
-    static final CommandMap commandMap;
-    static final Map<String, Command> knownCommandMap;
-
-    static {
-        try {
-            final Field commandMapField = Bukkit.getServer().getClass().getDeclaredField("commandMap");
-            commandMapField.setAccessible(true);
-            commandMap = (CommandMap) commandMapField.get(Bukkit.getServer());
-        } catch (NoSuchFieldException | IllegalAccessException exception) {
-            Bukkit.shutdown();
-            throw new SecurityException("Oh shit. Commands cannot be registered.", exception);
-        }
-        try {
-            final Field knownCommandsField = SimpleCommandMap.class.getDeclaredField("knownCommands");
-            knownCommandsField.setAccessible(true);
-            knownCommandMap = (Map<String, Command>) knownCommandsField.get(commandMap);
-        } catch (NoSuchFieldException | IllegalAccessException exception) {
-            Bukkit.shutdown();
-            throw new SecurityException("Oh shit. Commands cannot be registered.", exception);
-        }
-    }
-
-    static Object[] generateArgumentArray(CommandSender commandSender, TypeMapper<?>[] parameters, GuardChecker[] guards, String[] args, Class<?> varArgType, String[] subCommand) throws CommandParseException {
-        Object[] arguments = new Object[parameters.length + 1];
-        int index = 0;
-        while (index < subCommand.length) {
-            if (!args[index].equalsIgnoreCase(subCommand[index])) throw new CommandParseException();
-            index++;
-        }
-
-        int length = 0;
-        if (varArgType != null) {
-            length = args.length - parameters.length - subCommand.length + 1;
-            arguments[arguments.length - 1] = Array.newInstance(varArgType, length);
-            if (index > args.length - 1) return arguments;
-        }
-
-        for (int i = 0; i < parameters.length - (varArgType != null ? 1 : 0); i++) {
-            arguments[i + 1] = parameters[i].map(commandSender, Arrays.copyOf(args, index), args[index]);
-            index++;
-            if (arguments[i + 1] == null) throw new CommandParseException();
-        }
-
-        if (varArgType != null) {
-            Object varArgument = arguments[arguments.length - 1];
-
-            for (int i = 0; i < length; i++) {
-                Object value = parameters[parameters.length - 1].map(commandSender, Arrays.copyOf(args, index), args[index]);
-                if (value == null) throw new CommandParseException();
-                Array.set(varArgument, i, value);
-                index++;
+    static CommandPart generateCommandPart(boolean help, String[] subCommand, Parameter[] parameters, Map<String, TypeMapper<?>> localTypeMapper, Map<String, GuardChecker> localGuardChecker) {
+        CommandPart first = null;
+        CommandPart current = null;
+        for (String s : subCommand) {
+            CommandPart commandPart = new CommandPart(createMapper(s), null, null, null, help ? GuardCheckType.HELP_COMMAND : GuardCheckType.COMMAND);
+            commandPart.setIgnoreAsArgument(true);
+            if (current != null) {
+                current.setNext(commandPart);
+            }
+            current = commandPart;
+            if (first == null) {
+                first = current;
             }
         }
-        return arguments;
+        for (int i = 1; i < parameters.length; i++) {
+            Parameter parameter = parameters[i];
+            TypeMapper<?> typeMapper = getTypeMapper(parameter, localTypeMapper);
+            GuardChecker guardChecker = getGuardChecker(parameter, localGuardChecker);
+            Class<?> varArgType = parameter.isVarArgs() ? parameter.getType().getComponentType() : null;
+            SWCommand.OptionalValue optionalValue = parameter.getAnnotation(SWCommand.OptionalValue.class);
+
+            CommandPart commandPart = new CommandPart(typeMapper, guardChecker, varArgType, optionalValue != null ? optionalValue.value() : null, help ? GuardCheckType.HELP_COMMAND : GuardCheckType.COMMAND);
+            if (current != null) {
+                current.setNext(commandPart);
+            }
+            current = commandPart;
+            if (first == null) {
+                first = current;
+            }
+        }
+        return first;
+    }
+
+    static TypeMapper<?> getTypeMapper(Parameter parameter, Map<String, TypeMapper<?>> localTypeMapper) {
+        Class<?> clazz = parameter.getType();
+        if (parameter.isVarArgs()) {
+            clazz = clazz.getComponentType();
+        }
+
+        SWCommand.ClassMapper classMapper = parameter.getAnnotation(SWCommand.ClassMapper.class);
+        SWCommand.Mapper mapper = parameter.getAnnotation(SWCommand.Mapper.class);
+        if (clazz.isEnum() && classMapper == null && mapper == null && !MAPPER_FUNCTIONS.containsKey(clazz.getTypeName()) && !localTypeMapper.containsKey(clazz.getTypeName())) {
+            return createEnumMapper((Class<Enum<?>>) clazz);
+        }
+
+        String name = clazz.getTypeName();
+        if (classMapper != null) {
+            name = classMapper.value().getTypeName();
+        } else if (mapper != null) {
+            name = mapper.value();
+        } else {
+            SWCommand.StaticValue staticValue = parameter.getAnnotation(SWCommand.StaticValue.class);
+            if (staticValue != null && parameter.getType() == String.class) {
+                return createMapper(staticValue.value());
+            }
+        }
+        TypeMapper<?> typeMapper = localTypeMapper.getOrDefault(name, MAPPER_FUNCTIONS.getOrDefault(name, null));
+        if (typeMapper == null) {
+            throw new IllegalArgumentException("No mapper found for " + name);
+        }
+        return typeMapper;
+    }
+
+    static GuardChecker getGuardChecker(Parameter parameter, Map<String, GuardChecker> localGuardChecker) {
+        Class<?> clazz = parameter.getType();
+        if (parameter.isVarArgs()) {
+            clazz = clazz.getComponentType();
+        }
+
+        SWCommand.ClassGuard classGuard = parameter.getAnnotation(SWCommand.ClassGuard.class);
+        if (classGuard != null) {
+            if (classGuard.value() != null) {
+                return getGuardChecker(classGuard.value().getTypeName(), localGuardChecker);
+            }
+            return getGuardChecker(clazz.getTypeName(), localGuardChecker);
+        }
+
+        SWCommand.Guard guard = parameter.getAnnotation(SWCommand.Guard.class);
+        if (guard != null) {
+            if (guard.value() != null && !guard.value().isEmpty()) {
+                return getGuardChecker(guard.value(), localGuardChecker);
+            }
+            return getGuardChecker(clazz.getTypeName(), localGuardChecker);
+        }
+        return null;
+    }
+
+    private static GuardChecker getGuardChecker(String s, Map<String, GuardChecker> localGuardChecker) {
+        GuardChecker guardChecker = localGuardChecker.getOrDefault(s, GUARD_FUNCTIONS.getOrDefault(s, null));
+        if (guardChecker == null) {
+            throw new IllegalArgumentException("No guard found for " + s);
+        }
+        return guardChecker;
     }
 
     public static <T> void addMapper(Class<T> clazz, TypeMapper<T> mapper) {
@@ -186,6 +239,25 @@ public class SWCommandUtils {
         };
     }
 
+    public static TypeMapper<Enum<?>> createEnumMapper(Class<Enum<?>> enumClass) {
+        Enum<?>[] enums = enumClass.getEnumConstants();
+        List<String> strings = Arrays.stream(enums).map(Enum::name).map(String::toLowerCase).collect(Collectors.toList());
+        return new TypeMapper<Enum<?>>() {
+            @Override
+            public Enum<?> map(CommandSender commandSender, String[] previousArguments, String s) {
+                for (Enum<?> e : enums) {
+                    if (e.name().equalsIgnoreCase(s)) return e;
+                }
+                return null;
+            }
+
+            @Override
+            public List<String> tabCompletes(CommandSender commandSender, String[] previousArguments, String s) {
+                return strings;
+            }
+        };
+    }
+
     private static <T> Function<String, T> numberMapper(Function<String, T> mapper) {
         return s -> {
             try {

SpigotCore_Main/src/de/steamwar/command/SubCommand.java

@@ -19,18 +19,16 @@
 
 package de.steamwar.command;
 
-import org.bukkit.Bukkit;
 import org.bukkit.command.CommandSender;
 
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.lang.reflect.Parameter;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
 import java.util.function.Function;
 import java.util.function.Predicate;
-import java.util.logging.Level;
-
-import static de.steamwar.command.SWCommandUtils.*;
 
 class SubCommand {
 
@@ -38,214 +36,82 @@ class SubCommand {
     Method method;
     String[] description;
     String[] subCommand;
-    TypeMapper<?>[] arguments;
-    GuardChecker[] guards;
     private Predicate<CommandSender> commandSenderPredicate;
     private Function<CommandSender, ?> commandSenderFunction;
     GuardChecker guardChecker;
-    Class<?> varArgType = null;
-    private boolean help;
     boolean noTabComplete;
+    int comparableValue;
+
+    private CommandPart commandPart;
 
     SubCommand(SWCommand swCommand, Method method, String[] subCommand, Map<String, TypeMapper<?>> localTypeMapper, Map<String, GuardChecker> localGuardChecker, boolean help, String[] description, boolean noTabComplete) {
         this.swCommand = swCommand;
         this.method = method;
-        this.help = help;
         this.description = description;
         this.noTabComplete = noTabComplete;
+        this.subCommand = subCommand;
 
         Parameter[] parameters = method.getParameters();
+        comparableValue = parameters[parameters.length - 1].isVarArgs() ? Integer.MAX_VALUE : subCommand.length;
+
+        guardChecker = SWCommandUtils.getGuardChecker(parameters[0], localGuardChecker);
+
+        commandPart = SWCommandUtils.generateCommandPart(help, subCommand, parameters, localTypeMapper, localGuardChecker);
         commandSenderPredicate = sender -> parameters[0].getType().isAssignableFrom(sender.getClass());
         commandSenderFunction = sender -> parameters[0].getType().cast(sender);
-        this.subCommand = subCommand;
-        guardChecker = getGuardChecker(parameters[0], localGuardChecker);
-
-        arguments = new TypeMapper[parameters.length - 1];
-        guards = new GuardChecker[parameters.length - 1];
-        for (int i = 1; i < parameters.length; i++) {
-            Parameter parameter = parameters[i];
-            Class<?> clazz = parameter.getType();
-            if (parameter.isVarArgs()) {
-                clazz = clazz.getComponentType();
-                varArgType = clazz;
-            }
-
-            SWCommand.Mapper mapper = parameter.getAnnotation(SWCommand.Mapper.class);
-            SWCommand.ClassMapper classMapper = parameter.getAnnotation(SWCommand.ClassMapper.class);
-            if (clazz.isEnum() && mapper == null && classMapper == null && !MAPPER_FUNCTIONS.containsKey(clazz.getTypeName()) && !localTypeMapper.containsKey(clazz.getTypeName())) {
-                Class<Enum<?>> enumClass = (Class<Enum<?>>) clazz;
-                List<String> tabCompletes = new ArrayList<>();
-                for (Enum<?> enumConstant : enumClass.getEnumConstants()) {
-                    tabCompletes.add(enumConstant.name().toLowerCase());
-                }
-                arguments[i - 1] = SWCommandUtils.createMapper(s -> ENUM_MAPPER.apply(enumClass, s), s -> tabCompletes);
-                continue;
-            }
-
-            String name = clazz.getTypeName();
-            if (classMapper != null) {
-                name = classMapper.value().getTypeName();
-            } else if (mapper != null) {
-                name = mapper.value();
-            } else {
-                SWCommand.StaticValue staticValue = parameter.getAnnotation(SWCommand.StaticValue.class);
-                if (staticValue != null && parameter.getType() == String.class) {
-                    arguments[i - 1] = SWCommandUtils.createMapper(staticValue.value());
-                    guards[i - 1] = getGuardChecker(parameter, localGuardChecker);
-                    continue;
-                }
-            }
-            arguments[i - 1] = localTypeMapper.containsKey(name)
-                    ? localTypeMapper.get(name)
-                    : MAPPER_FUNCTIONS.getOrDefault(name, ERROR_FUNCTION);
-            guards[i - 1] = getGuardChecker(parameter, localGuardChecker);
-        }
-    }
-
-    private GuardChecker getGuardChecker(Parameter parameter, Map<String, GuardChecker> localGuardChecker) {
-        SWCommand.ClassGuard classGuard = parameter.getAnnotation(SWCommand.ClassGuard.class);
-        if (classGuard != null) {
-            if (classGuard.value() == null) {
-                String s = parameter.getType().getTypeName();
-                if (parameter.isVarArgs()) {
-                    s = parameter.getType().getComponentType().getTypeName();
-                }
-                return localGuardChecker.getOrDefault(s, GUARD_FUNCTIONS.getOrDefault(s, null));
-            }
-            GuardChecker current = localGuardChecker.getOrDefault(classGuard.value().getTypeName(), GUARD_FUNCTIONS.getOrDefault(classGuard.value().getTypeName(), null));
-            if (current == null) {
-                Bukkit.getLogger().log(Level.WARNING, () -> "The guard checker with name '" + classGuard.value().getTypeName() + "' is neither a local guard checker nor a global one");
-            }
-            return current;
-        }
-        SWCommand.Guard guard = parameter.getAnnotation(SWCommand.Guard.class);
-        if (guard != null) {
-            if (guard.value() == null || guard.value().isEmpty()) {
-                String s = parameter.getType().getTypeName();
-                if (parameter.isVarArgs()) {
-                    s = parameter.getType().getComponentType().getTypeName();
-                }
-                return localGuardChecker.getOrDefault(s, GUARD_FUNCTIONS.getOrDefault(s, null));
-            }
-            GuardChecker current = localGuardChecker.getOrDefault(guard.value(), GUARD_FUNCTIONS.getOrDefault(guard.value(), null));
-            if (current == null) {
-                Bukkit.getLogger().log(Level.WARNING, () -> "The guard checker with name '" + guard.value() + "' is neither a local guard checker nor a global one");
-            }
-            return current;
-        }
-        return null;
     }
 
     boolean invoke(CommandSender commandSender, String[] args) {
-        if (args.length < arguments.length + subCommand.length - (varArgType != null ? 1 : 0)) {
-            return false;
-        }
-        if (varArgType == null && args.length > arguments.length + subCommand.length) {
-            return false;
-        }
         try {
             if (!commandSenderPredicate.test(commandSender)) {
                 return false;
             }
-            Object[] objects = SWCommandUtils.generateArgumentArray(commandSender, arguments, guards, args, varArgType, subCommand);
-            objects[0] = commandSenderFunction.apply(commandSender);
-            for (int i = subCommand.length; i < args.length; i++) {
-                GuardChecker current;
-                if (i == subCommand.length) {
-                    current = guardChecker;
-                } else {
-                    if (i >= objects.length + subCommand.length) {
-                        current = guards[guards.length - 1];
-                    } else {
-                        current = guards[i - 1 - subCommand.length];
-                    }
+
+            if (commandPart == null) {
+                if (args.length != 0) {
+                    return false;
                 }
-                if (current != null) {
-                    GuardResult guardResult;
-                    if (i == 0) {
-                        guardResult = current.guard(commandSender, help ? GuardCheckType.HELP_COMMAND : GuardCheckType.COMMAND, new String[0], null);
-                    } else {
-                        guardResult = current.guard(commandSender, help ? GuardCheckType.HELP_COMMAND : GuardCheckType.COMMAND, Arrays.copyOf(args, i - 1), args[i - 1]);
-                    }
-                    if (guardResult != GuardResult.ALLOWED) {
-                        if (guardResult == GuardResult.DENIED) {
+                method.setAccessible(true);
+                method.invoke(swCommand, commandSenderFunction.apply(commandSender));
+            } else {
+                List<Object> objects = new ArrayList<>();
+                commandPart.generateArgumentArray(objects, commandSender, args, 0);
+                if (guardChecker != null) {
+                    GuardResult guardResult = guardChecker.guard(commandSender, GuardCheckType.COMMAND, new String[0], null);
+                    switch (guardResult) {
+                        case ALLOWED:
+                            break;
+                        case DENIED:
                             throw new CommandNoHelpException();
-                        }
-                        return false;
+                        case DENIED_WITH_HELP:
+                        default:
+                            return true;
                     }
                 }
+                commandPart.guardCheck(commandSender, args, 0);
+                objects.add(0, commandSenderFunction.apply(commandSender));
+                method.setAccessible(true);
+                method.invoke(swCommand, objects.toArray());
             }
-            method.setAccessible(true);
-            method.invoke(swCommand, objects);
         } catch (CommandNoHelpException e) {
             throw e;
-        } catch (IllegalAccessException | RuntimeException | InvocationTargetException e) {
-            throw new SecurityException(e.getMessage(), e);
         } catch (CommandParseException e) {
             return false;
+        } catch (IllegalAccessException | RuntimeException | InvocationTargetException e) {
+            throw new SecurityException(e.getMessage(), e);
         }
         return true;
     }
 
     List<String> tabComplete(CommandSender commandSender, String[] args) {
-        if (varArgType == null && args.length > arguments.length + subCommand.length) {
-            return null;
-        }
         if (guardChecker != null && guardChecker.guard(commandSender, GuardCheckType.TAB_COMPLETE, new String[0], null) != GuardResult.ALLOWED) {
             return null;
         }
-        int index = 0;
-        List<String> argsList = new LinkedList<>(Arrays.asList(args));
-        for (String value : subCommand) {
-            String s = argsList.remove(0);
-            if (argsList.isEmpty()) return Collections.singletonList(value);
-            if (!value.equalsIgnoreCase(s)) return null;
-            index++;
+        if (commandPart == null) {
+            return null;
         }
-        int guardIndex = 0;
-        for (TypeMapper<?> argument : arguments) {
-            String s = argsList.remove(0);
-            if (argsList.isEmpty()) {
-                if (guards[guardIndex] != null && guards[guardIndex].guard(commandSender, GuardCheckType.TAB_COMPLETE, Arrays.copyOf(args, args.length - 1), s) != GuardResult.ALLOWED) {
-                    return null;
-                }
-                return argument.tabCompletes(commandSender, Arrays.copyOf(args, args.length - 1), s);
-            }
-            try {
-                if (guards[guardIndex] != null && guards[guardIndex].guard(commandSender, GuardCheckType.TAB_COMPLETE, Arrays.copyOf(args, index), s) != GuardResult.ALLOWED) {
-                    return null;
-                }
-                if (argument.map(commandSender, Arrays.copyOf(args, index), s) == null) {
-                    return null;
-                }
-            } catch (Exception e) {
-                return null;
-            }
-            index++;
-            guardIndex++;
-        }
-        if (varArgType != null && !argsList.isEmpty()) {
-            while (!argsList.isEmpty()) {
-                String s = argsList.remove(0);
-                if (argsList.isEmpty()) {
-                    if (guards[guards.length - 1] != null && guards[guards.length - 1].guard(commandSender, GuardCheckType.TAB_COMPLETE, Arrays.copyOf(args, args.length - 1), s) != GuardResult.ALLOWED) {
-                        return null;
-                    }
-                    return arguments[arguments.length - 1].tabCompletes(commandSender, Arrays.copyOf(args, args.length - 1), s);
-                }
-                try {
-                    if (guards[guards.length - 1] != null && guards[guards.length - 1].guard(commandSender, GuardCheckType.TAB_COMPLETE, Arrays.copyOf(args, index), s) != GuardResult.ALLOWED) {
-                        return null;
-                    }
-                    if (arguments[arguments.length - 1].map(commandSender, Arrays.copyOf(args, index), s) == null) {
-                        return null;
-                    }
-                } catch (Exception e) {
-                    return null;
-                }
-                index++;
-            }
-        }
-        return null;
+        List<String> list = new ArrayList<>();
+        commandPart.generateTabComplete(list, commandSender, args, 0);
+        return list;
     }
 }

SpigotCore_Main/src/de/steamwar/command/TypeMapper.java

@@ -24,6 +24,9 @@ import org.bukkit.command.CommandSender;
 import java.util.List;
 
 public interface TypeMapper<T> {
+    /**
+     * The CommandSender can be null!
+     */
     default T map(CommandSender commandSender, String[] previousArguments, String s) {
         return map(previousArguments, s);
     }

SpigotCore_Main/src/de/steamwar/core/Core.java

@@ -38,7 +38,6 @@ import java.util.logging.Level;
 
 public class Core extends JavaPlugin{
 
-
 	private static Core instance;
 	private static final int version;
 	public static Message MESSAGE;

SpigotCore_Main/src/de/steamwar/sql/SteamwarUser.java

@@ -25,7 +25,9 @@ import org.bukkit.entity.Player;
 
 import java.sql.ResultSet;
 import java.sql.SQLException;
-import java.util.*;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
 
 public class SteamwarUser {
 

SpigotCore_Main/testsrc/de/steamwar/TestCommandSender.java

@@ -0,0 +1,122 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar;
+
+import org.bukkit.Server;
+import org.bukkit.command.CommandSender;
+import org.bukkit.permissions.Permission;
+import org.bukkit.permissions.PermissionAttachment;
+import org.bukkit.permissions.PermissionAttachmentInfo;
+import org.bukkit.plugin.Plugin;
+
+import java.util.Set;
+
+public class TestCommandSender implements CommandSender {
+
+    @Override
+    public void sendMessage(String s) {
+        
+    }
+
+    @Override
+    public void sendMessage(String[] strings) {
+
+    }
+
+    @Override
+    public Server getServer() {
+        return null;
+    }
+
+    @Override
+    public String getName() {
+        return null;
+    }
+
+    @Override
+    public Spigot spigot() {
+        return null;
+    }
+
+    @Override
+    public boolean isPermissionSet(String s) {
+        return false;
+    }
+
+    @Override
+    public boolean isPermissionSet(Permission permission) {
+        return false;
+    }
+
+    @Override
+    public boolean hasPermission(String s) {
+        return false;
+    }
+
+    @Override
+    public boolean hasPermission(Permission permission) {
+        return false;
+    }
+
+    @Override
+    public PermissionAttachment addAttachment(Plugin plugin, String s, boolean b) {
+        return null;
+    }
+
+    @Override
+    public PermissionAttachment addAttachment(Plugin plugin) {
+        return null;
+    }
+
+    @Override
+    public PermissionAttachment addAttachment(Plugin plugin, String s, boolean b, int i) {
+        return null;
+    }
+
+    @Override
+    public PermissionAttachment addAttachment(Plugin plugin, int i) {
+        return null;
+    }
+
+    @Override
+    public void removeAttachment(PermissionAttachment permissionAttachment) {
+
+    }
+
+    @Override
+    public void recalculatePermissions() {
+
+    }
+
+    @Override
+    public Set<PermissionAttachmentInfo> getEffectivePermissions() {
+        return null;
+    }
+
+    @Override
+    public boolean isOp() {
+        return false;
+    }
+
+    @Override
+    public void setOp(boolean b) {
+
+    }
+}

SpigotCore_Main/testsrc/de/steamwar/command/ExecutionIdentifier.java

@@ -0,0 +1,41 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.command;
+
+public class ExecutionIdentifier extends RuntimeException {
+    public ExecutionIdentifier() {
+    }
+
+    public ExecutionIdentifier(String message) {
+        super(message);
+    }
+
+    public ExecutionIdentifier(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public ExecutionIdentifier(Throwable cause) {
+        super(cause);
+    }
+
+    public ExecutionIdentifier(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
+        super(message, cause, enableSuppression, writableStackTrace);
+    }
+}

SpigotCore_Main/testsrc/de/steamwar/command/SimpleCommand.java

@@ -0,0 +1,34 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.command;
+
+import org.bukkit.command.CommandSender;
+
+public class SimpleCommand extends SWCommand {
+
+    public SimpleCommand() {
+        super(true, "simple");
+    }
+
+    @Register
+    public void execute(CommandSender sender) {
+        throw new ExecutionIdentifier("Simple execute without any parameters");
+    }
+}

SpigotCore_Main/testsrc/de/steamwar/command/SimpleCommandPartTest.java

@@ -0,0 +1,243 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.command;
+
+import de.steamwar.TestCommandSender;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+
+public class SimpleCommandPartTest {
+
+    private CommandPart stringCommandPart;
+    private CommandPart intCommandPart;
+    private CommandPart chainedCommandPart;
+    private CommandPart varArgCommandPart;
+
+    private CommandPart simpleGuardPart;
+
+    private CommandPart optionalCommandPart;
+
+    @Before
+    public void setUp() throws Exception {
+        stringCommandPart = new CommandPart(SWCommandUtils.createMapper("hello", "world"), null, null, null, GuardCheckType.COMMAND);
+        intCommandPart = new CommandPart(SWCommandUtils.MAPPER_FUNCTIONS.get("int"), null, null, null, GuardCheckType.COMMAND);
+
+        chainedCommandPart = new CommandPart(SWCommandUtils.createMapper("hello", "world"), null, null, null, GuardCheckType.COMMAND);
+        chainedCommandPart.setNext(new CommandPart(SWCommandUtils.MAPPER_FUNCTIONS.get("int"), null, null, null, GuardCheckType.COMMAND));
+
+        varArgCommandPart = new CommandPart(SWCommandUtils.createMapper("hello", "world"), null, String.class, null, GuardCheckType.COMMAND);
+
+        simpleGuardPart = new CommandPart(SWCommandUtils.createMapper("hello", "world"), (commandSender, guardCheckType, previousArguments, s) -> s.equals("hello") ? GuardResult.DENIED : GuardResult.ALLOWED, null, null, GuardCheckType.COMMAND);
+
+        optionalCommandPart = new CommandPart(SWCommandUtils.createMapper("hello", "world"), null, null, "hello", GuardCheckType.COMMAND);
+        optionalCommandPart.setNext(new CommandPart(SWCommandUtils.createMapper("hello2", "world2"), null, null, null, GuardCheckType.COMMAND));
+    }
+
+    @Test
+    public void testCommandPartTabCompleteNoArguments() {
+        List<String> tabComplete = new ArrayList<>();
+        stringCommandPart.generateTabComplete(tabComplete, new TestCommandSender(), new String[]{""}, 0);
+        assertThat(tabComplete.size(), is(2));
+        assertThat(tabComplete.get(0), is("hello"));
+        assertThat(tabComplete.get(1), is("world"));
+    }
+
+    @Test(expected = CommandParseException.class)
+    public void testCommandExecuteInvalidArgument() {
+        stringCommandPart.generateArgumentArray(new ArrayList<>(), new TestCommandSender(), new String[]{""}, 0);
+    }
+
+    @Test
+    public void testCommandExecuteValidArgument() {
+        List<Object> argumentArray = new ArrayList<>();
+        stringCommandPart.generateArgumentArray(argumentArray, new TestCommandSender(), new String[]{"hello"}, 0);
+        assertThat(argumentArray.size(), is(1));
+        assertThat(argumentArray.get(0), instanceOf(String.class));
+        assertThat(argumentArray.get(0), is("hello"));
+    }
+
+    @Test
+    public void testCommandExecuteValidOtherArgument() {
+        List<Object> argumentArray = new ArrayList<>();
+        stringCommandPart.generateArgumentArray(argumentArray, new TestCommandSender(), new String[]{"world"}, 0);
+        assertThat(argumentArray.size(), is(1));
+        assertThat(argumentArray.get(0), instanceOf(String.class));
+        assertThat(argumentArray.get(0), is("world"));
+    }
+
+    @Test(expected = CommandParseException.class)
+    public void testCommandExecuteNonNumberArgument() {
+        intCommandPart.generateArgumentArray(new ArrayList<>(), new TestCommandSender(), new String[]{"world"}, 0);
+    }
+
+    @Test
+    public void testCommandExecuteValidNumberArgument() {
+        List<Object> argumentArray = new ArrayList<>();
+        intCommandPart.generateArgumentArray(argumentArray, new TestCommandSender(), new String[]{"0"}, 0);
+        assertThat(argumentArray.size(), is(1));
+        assertThat(argumentArray.get(0), instanceOf(int.class));
+        assertThat(argumentArray.get(0), is(0));
+    }
+
+    @Test
+    public void testChainedCommandExecuteValidArgument() {
+        List<Object> argumentArray = new ArrayList<>();
+        chainedCommandPart.generateArgumentArray(argumentArray, new TestCommandSender(), new String[]{"hello", "0"}, 0);
+        assertThat(argumentArray.size(), is(2));
+        assertThat(argumentArray.get(0), instanceOf(String.class));
+        assertThat(argumentArray.get(0), is("hello"));
+        assertThat(argumentArray.get(1), instanceOf(int.class));
+        assertThat(argumentArray.get(1), is(0));
+    }
+
+    @Test
+    public void testChainedCommandTabComplete() {
+        List<String> tabCompletes = new ArrayList<>();
+        chainedCommandPart.generateTabComplete(tabCompletes, new TestCommandSender(), new String[]{""}, 0);
+        assertThat(tabCompletes.size(), is(2));
+        assertThat(tabCompletes.get(0), is("hello"));
+        assertThat(tabCompletes.get(1), is("world"));
+    }
+
+    @Test
+    public void testChainedCommandTabCompleteOther() {
+        List<String> tabCompletes = new ArrayList<>();
+        chainedCommandPart.generateTabComplete(tabCompletes, new TestCommandSender(), new String[]{"hello", ""}, 0);
+        assertThat(tabCompletes.size(), is(0));
+    }
+
+    @Test
+    public void testVarArgsCommandTabComplete() {
+        List<String> tabCompletes = new ArrayList<>();
+        varArgCommandPart.generateTabComplete(tabCompletes, new TestCommandSender(), new String[]{"hello"}, 0);
+        assertThat(tabCompletes.size(), is(2));
+        assertThat(tabCompletes.get(0), is("hello"));
+        assertThat(tabCompletes.get(1), is("world"));
+    }
+
+    @Test
+    public void testVarArgsCommandTabCompleteDeeper() {
+        List<String> tabCompletes = new ArrayList<>();
+        varArgCommandPart.generateTabComplete(tabCompletes, new TestCommandSender(), new String[]{"hello", "world", "hello", "world"}, 0);
+        System.out.println(tabCompletes);
+        assertThat(tabCompletes.size(), is(2));
+        assertThat(tabCompletes.get(0), is("hello"));
+        assertThat(tabCompletes.get(1), is("world"));
+    }
+
+    @Test
+    public void testVarArgsCommandArgumentParsing() {
+        List<Object> argumentArray = new ArrayList<>();
+        varArgCommandPart.generateArgumentArray(argumentArray, new TestCommandSender(), new String[]{"hello"}, 0);
+        assertThat(argumentArray.size(), is(1));
+        assertThat(argumentArray.get(0), instanceOf(String[].class));
+        assertThat((String[]) argumentArray.get(0), arrayWithSize(1));
+        assertThat((String[]) argumentArray.get(0), is(new String[]{"hello"}));
+    }
+
+    @Test
+    public void testVarArgsCommandArgumentParsingDeeper() {
+        List<Object> argumentArray = new ArrayList<>();
+        varArgCommandPart.generateArgumentArray(argumentArray, new TestCommandSender(), new String[]{"hello", "world", "hello", "world"}, 0);
+        assertThat(argumentArray.size(), is(1));
+        assertThat(argumentArray.get(0), instanceOf(String[].class));
+        assertThat((String[]) argumentArray.get(0), arrayWithSize(4));
+        assertThat((String[]) argumentArray.get(0), is(new String[]{"hello", "world", "hello", "world"}));
+    }
+
+    @Test
+    public void testGuardCommandExecute() {
+        List<Object> argumentArray = new ArrayList<>();
+        simpleGuardPart.generateArgumentArray(argumentArray, new TestCommandSender(), new String[]{"hello"}, 0);
+        assertThat(argumentArray.size(), is(1));
+    }
+
+    @Test(expected = CommandNoHelpException.class)
+    public void testGuardGuardCheck() {
+        simpleGuardPart.guardCheck(new TestCommandSender(), new String[]{"hello"}, 0);
+    }
+
+    @Test
+    public void testGuardCommandExecuteValid() {
+        List<Object> argumentArray = new ArrayList<>();
+        simpleGuardPart.generateArgumentArray(argumentArray, new TestCommandSender(), new String[]{"world"}, 0);
+        assertThat(argumentArray.size(), is(1));
+    }
+
+    @Test
+    public void testGuardGuardCheckValid() {
+        boolean guardResult = simpleGuardPart.guardCheck(new TestCommandSender(), new String[]{"world"}, 0);
+        assertThat(guardResult, is(true));
+    }
+
+    @Test
+    public void testOptionalCommandPartTabComplete() {
+        List<String> tabCompletes = new ArrayList<>();
+        optionalCommandPart.generateTabComplete(tabCompletes, new TestCommandSender(), new String[]{""}, 0);
+        assertThat(tabCompletes.size(), is(4));
+        assertThat(tabCompletes.get(0), is("hello"));
+        assertThat(tabCompletes.get(1), is("world"));
+        assertThat(tabCompletes.get(2), is("hello2"));
+        assertThat(tabCompletes.get(3), is("world2"));
+    }
+
+    @Test
+    public void testOptionalCommandPartTabCompleteSecond() {
+        List<String> tabCompletes = new ArrayList<>();
+        optionalCommandPart.generateTabComplete(tabCompletes, new TestCommandSender(), new String[]{"hello", ""}, 0);
+        assertThat(tabCompletes.size(), is(2));
+        assertThat(tabCompletes.get(0), is("hello2"));
+        assertThat(tabCompletes.get(1), is("world2"));
+    }
+
+    @Test(expected = CommandParseException.class)
+    public void testOptionalCommandPartExecution() {
+        optionalCommandPart.generateArgumentArray(new ArrayList<>(), new TestCommandSender(), new String[]{""}, 0);
+    }
+
+    @Test
+    public void testOptionalCommandPartExecutionValid() {
+        List<Object> argumentArray = new ArrayList<>();
+        optionalCommandPart.generateArgumentArray(argumentArray, new TestCommandSender(), new String[]{"hello2"}, 0);
+        assertThat(argumentArray.size(), is(2));
+        assertThat(argumentArray.get(0), is("hello"));
+        assertThat(argumentArray.get(1), is("hello2"));
+    }
+
+    @Test(expected = CommandParseException.class)
+    public void testOptionalCommandPartExecutionInvalid() {
+        optionalCommandPart.generateArgumentArray(new ArrayList<>(), new TestCommandSender(), new String[]{"hello"}, 0);
+    }
+
+    @Test
+    public void testOptionalCommandPartExecutionFullyValid() {
+        List<Object> argumentArray = new ArrayList<>();
+        optionalCommandPart.generateArgumentArray(argumentArray, new TestCommandSender(), new String[]{"world", "hello2"}, 0);
+        assertThat(argumentArray.size(), is(2));
+        assertThat(argumentArray.get(0), is("world"));
+        assertThat(argumentArray.get(1), is("hello2"));
+    }
+}

SpigotCore_Main/testsrc/de/steamwar/command/SimpleCommandTest.java

@@ -0,0 +1,61 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.command;
+
+import de.steamwar.TestCommandSender;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class SimpleCommandTest {
+
+    private SimpleCommand simpleCommand;
+
+    @Before
+    public void setUp() throws Exception {
+        simpleCommand = new SimpleCommand();
+    }
+
+    @Test
+    public void testCommandParsing() {
+        try {
+            simpleCommand.execute(new TestCommandSender(), "", new String[]{});
+        } catch (SecurityException securityException) {
+            if (securityException.getCause().getCause() instanceof ExecutionIdentifier) {
+                ExecutionIdentifier executionIdentifier = (ExecutionIdentifier) securityException.getCause().getCause();
+                assertThat(executionIdentifier.getMessage(), is("Simple execute without any parameters"));
+                return;
+            }
+        }
+        assert false;
+    }
+
+    @Test
+    public void testUnknownCommandParsing() {
+        try {
+            simpleCommand.execute(new TestCommandSender(), "", new String[]{"unknown"});
+        } catch (SecurityException securityException) {
+            securityException.printStackTrace();
+            assert false;
+        }
+    }
+}

steamwarci.yml

@@ -3,6 +3,7 @@ build:
   - "cp ~/gradle.properties ."
   - "chmod u+x build.gradle"
   - "./gradlew buildProject"
+  - "./gradlew test"
 
 artifacts:
   "/binarys/spigotcore.jar": "build/libs/spigotcore.jar"