src/de/steamwar/command/AbstractSWCommand.java

@@ -69,9 +69,11 @@ public abstract class AbstractSWCommand<T> {
 
     protected final void execute(T sender, String alias, String[] args) {
         initialize();
+        List<Runnable> errors = new ArrayList<>();
         try {
-            if (!commandList.stream().anyMatch(s -> s.invoke(sender, alias, args))) {
-                commandHelpList.stream().anyMatch(s -> s.invoke(sender, alias, args));
+            if (!commandList.stream().anyMatch(s -> s.invoke(errors::add, sender, alias, args))) {
+                errors.forEach(Runnable::run);
+                commandHelpList.stream().anyMatch(s -> s.invoke((ignore) -> {}, sender, alias, args));
             }
         } catch (CommandNoHelpException e) {
             // Ignored

src/de/steamwar/command/AbstractTypeMapper.java

@@ -20,6 +20,7 @@
 package de.steamwar.command;
 
 import java.util.Collection;
+import java.util.function.BiConsumer;
 
 public interface AbstractTypeMapper<K, T> extends AbstractValidator<K, T> {
     /**
@@ -27,5 +28,10 @@ public interface AbstractTypeMapper<K, T> extends AbstractValidator<K, T> {
      */
     T map(K sender, String[] previousArguments, String s);
 
+    @Override
+    default boolean validate(K sender, T value, BiConsumer<String, Object[]> messageSender) {
+        return true;
+    }
+
     Collection<String> tabCompletes(K sender, String[] previousArguments, String s);
 }

src/de/steamwar/command/AbstractValidator.java

@@ -21,6 +21,7 @@ package de.steamwar.command;
 
 import java.util.function.BiConsumer;
 
+@FunctionalInterface
 public interface AbstractValidator<K, T> {
 
     /**
@@ -31,7 +32,5 @@ public interface AbstractValidator<K, T> {
      * @param messageSender The message sender to send messages to the player. Never send messages directly to the player.
      * @return The result of the validation.
      */
-    default boolean validate(K sender, T value, BiConsumer<String, Object[]> messageSender) {
-        return true;
-    }
+    boolean validate(K sender, T value, BiConsumer<String, Object[]> messageSender);
 }

src/de/steamwar/command/CommandPart.java

@@ -23,9 +23,11 @@ import lombok.AllArgsConstructor;
 import lombok.Setter;
 
 import java.lang.reflect.Array;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
+import java.util.function.Consumer;
 
 class CommandPart<T> {
 
@@ -86,11 +88,11 @@ class CommandPart<T> {
         }
     }
 
-    public void generateArgumentArray(List<Object> current, T sender, String[] args, int startIndex) {
+    public void generateArgumentArray(Consumer<Runnable> errors, List<Object> current, T sender, String[] args, int startIndex) {
         if (varArgType != null) {
             Object array = Array.newInstance(varArgType, args.length - startIndex);
             for (int i = startIndex; i < args.length; i++) {
-                CheckArgumentResult validArgument = checkArgument(null, sender, args, i);
+                CheckArgumentResult validArgument = checkArgument(errors, null, sender, args, i);
                 if (!validArgument.success) {
                     throw new CommandParseException();
                 }
@@ -100,7 +102,7 @@ class CommandPart<T> {
             return;
         }
 
-        CheckArgumentResult validArgument = checkArgument(null, sender, args, startIndex);
+        CheckArgumentResult validArgument = checkArgument(errors, null, sender, args, startIndex);
         if (!validArgument.success && optional == null) {
             throw new CommandParseException();
         }
@@ -109,7 +111,7 @@ class CommandPart<T> {
                 current.add(typeMapper.map(sender, EMPTY_ARRAY, optional));
             }
             if (next != null) {
-                next.generateArgumentArray(current, sender, args, startIndex);
+                next.generateArgumentArray(errors, current, sender, args, startIndex);
             }
             return;
         }
@@ -117,7 +119,7 @@ class CommandPart<T> {
             current.add(validArgument.value);
         }
         if (next != null) {
-            next.generateArgumentArray(current, sender, args, startIndex + 1);
+            next.generateArgumentArray(errors, current, sender, args, startIndex + 1);
         }
     }
 
@@ -181,7 +183,7 @@ class CommandPart<T> {
     public void generateTabComplete(List<String> current, T sender, String[] args, int startIndex) {
         if (varArgType != null) {
             for (int i = startIndex; i < args.length - 1; i++) {
-                CheckArgumentResult validArgument = checkArgument(GuardCheckType.TAB_COMPLETE, sender, args, i);
+                CheckArgumentResult validArgument = checkArgument((ignore) -> {}, GuardCheckType.TAB_COMPLETE, sender, args, i);
                 if (!validArgument.success) {
                     return;
                 }
@@ -194,7 +196,7 @@ class CommandPart<T> {
         }
 
         if (args.length - 1 > startIndex) {
-            CheckArgumentResult checkArgumentResult = checkArgument(GuardCheckType.TAB_COMPLETE, sender, args, startIndex);
+            CheckArgumentResult checkArgumentResult = checkArgument((ignore) -> {}, GuardCheckType.TAB_COMPLETE, sender, args, startIndex);
             if (checkArgumentResult.success && next != null) {
                 next.generateTabComplete(current, sender, args, startIndex + 1);
                 return;
@@ -214,19 +216,21 @@ class CommandPart<T> {
         }
     }
 
-    private CheckArgumentResult checkArgument(GuardCheckType guardCheckType, T sender, String[] args, int index) {
+    private CheckArgumentResult checkArgument(Consumer<Runnable> errors, GuardCheckType guardCheckType, T sender, String[] args, int index) {
         try {
             Object value = typeMapper.map(sender, Arrays.copyOf(args, index), args[index]);
-            if (value == null) {
-                return new CheckArgumentResult(false, null);
-            }
             if (validator != null) {
                 if (!validator.validate(sender, value, (s, objects) -> {
-                    // ignore
+                    errors.accept(() -> {
+                        command.sendMessage(sender, s, objects);
+                    });
                 })) {
                     return new CheckArgumentResult(false, null);
                 }
-                return new CheckArgumentResult(true, value);
+                return new CheckArgumentResult(value != null, value);
+            }
+            if (value == null) {
+                return new CheckArgumentResult(false, null);
             }
 
             GuardResult guardResult = checkGuard(guardCheckType, sender, args, index);

src/de/steamwar/command/SWCommandUtils.java

@@ -183,7 +183,7 @@ public class SWCommandUtils {
 
         AbstractSWCommand.Validator validator = parameter.getAnnotation(AbstractSWCommand.Validator.class);
         if (validator != null) {
-            if (validator.value() != null) {
+            if (validator.value() != null && !validator.value().isEmpty()) {
                 return getValidator(validator.value(), localValidator);
             }
             return getValidator(clazz.getTypeName(), localValidator);
@@ -191,12 +191,9 @@ public class SWCommandUtils {
 
         AbstractSWCommand.ErrorMessage errorMessage = parameter.getAnnotation(AbstractSWCommand.ErrorMessage.class);
         if (errorMessage != null) {
-            return new AbstractValidator<T, String>() {
-                @Override
-                public boolean validate(T sender, String value, BiConsumer<String, Object[]> messageSender) {
-                    if (value == null) messageSender.accept(errorMessage.value(), new Object[0]);
-                    return value != null;
-                }
+            return (AbstractValidator<T, String>) (sender, value, messageSender) -> {
+                if (value == null) messageSender.accept(errorMessage.value(), new Object[0]);
+                return value != null;
             };
         }
         return null;

src/de/steamwar/command/SubCommand.java

@@ -25,6 +25,7 @@ import java.lang.reflect.Parameter;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.Predicate;
 
@@ -62,7 +63,7 @@ public class SubCommand<T> {
         senderFunction = t -> parameters[0].getType().cast(t);
     }
 
-    boolean invoke(T sender, String alias, String[] args) {
+    boolean invoke(Consumer<Runnable> errors, T sender, String alias, String[] args) {
         try {
             if (!senderPredicate.test(sender)) {
                 return false;
@@ -94,7 +95,7 @@ public class SubCommand<T> {
                 method.invoke(abstractSWCommand, senderFunction.apply(sender));
             } else {
                 List<Object> objects = new ArrayList<>();
-                commandPart.generateArgumentArray(objects, sender, args, 0);
+                commandPart.generateArgumentArray(errors, objects, sender, args, 0);
                 if (validator != null) {
                     if (!validator.validate(sender, sender, (s, objectArgs) -> {
                         abstractSWCommand.sendMessage(sender, s, objectArgs);

testsrc/de/steamwar/command/ValidatorCommand.java

@@ -0,0 +1,60 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2022  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.command.dto.ExecutionIdentifier;
+import de.steamwar.command.dto.TestSWCommand;
+import de.steamwar.command.dto.TestValidator;
+
+public class ValidatorCommand extends TestSWCommand {
+
+    public ValidatorCommand() {
+        super("testvalidator");
+    }
+
+    @Register
+    public void test(@Validator String sender) {
+        throw new ExecutionIdentifier("RunTest");
+    }
+
+    @Override
+    protected void sendMessage(String sender, String message, Object[] args) {
+        if (message.equals("Hello World")) {
+            throw new ExecutionIdentifier("RunSendMessageWithHelloWorldParameter");
+        }
+    }
+
+    @Register
+    public void onError(String sender, @ErrorMessage("Hello World") int error) {
+        throw new ExecutionIdentifier("RunOnError");
+    }
+
+    @Register
+    public void onError(String sender, double error) {
+        throw new ExecutionIdentifier("RunOnErrorDouble");
+    }
+
+    @ClassValidator(value = String.class, local = true)
+    public TestValidator<String> validator() {
+        return (sender, value, messageSender) -> {
+            throw new ExecutionIdentifier("RunValidator");
+        };
+    }
+}

testsrc/de/steamwar/command/ValidatorCommandTest.java

@@ -0,0 +1,63 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2022  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.command.dto.ExecutionIdentifier;
+import org.junit.Test;
+
+import static de.steamwar.AssertionUtils.assertCMDFramework;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class ValidatorCommandTest {
+
+    @Test
+    public void testValidator() {
+        ValidatorCommand cmd = new ValidatorCommand();
+        try {
+            cmd.execute("test", "", new String[0]);
+            assertThat(true, is(false));
+        } catch (Exception e) {
+            assertThat(e.getMessage(), is("RunValidator"));
+        }
+    }
+
+    @Test
+    public void testErrorMessage() {
+        ValidatorCommand cmd = new ValidatorCommand();
+        try {
+            cmd.execute("test", "", new String[]{"Hello"});
+            assertThat(true, is(false));
+        } catch (Exception e) {
+            assertThat(e.getMessage(), is("RunSendMessageWithHelloWorldParameter"));
+        }
+    }
+
+    @Test
+    public void testErrorNoMessage() {
+        ValidatorCommand cmd = new ValidatorCommand();
+        try {
+            cmd.execute("test", "", new String[]{"0.0"});
+            assertThat(true, is(false));
+        } catch (Exception e) {
+            assertCMDFramework(e, ExecutionIdentifier.class, "RunOnErrorDouble");
+        }
+    }
+}

testsrc/de/steamwar/command/dto/TestValidator.java

@@ -0,0 +1,25 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2022  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.dto;
+
+import de.steamwar.command.AbstractValidator;
+
+public interface TestValidator<T> extends AbstractValidator<String, T> {
+}