Merge pull request 'add Checks system' (#6) from feat/checks into dev

Reviewed-on: #6

lib/build.gradle.kts

@@ -21,13 +21,13 @@ dependencies {
 
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
     implementation(libs.log4j)
-
+    implementation(libs.geantyref)
 }
 
 // Apply a specific Java toolchain to ease working on different environments.
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(21)
+        languageVersion = JavaLanguageVersion.of(23)
     }
 }
 

lib/src/main/java/net/tomatentum/marinara/Marinara.java

@@ -1,22 +1,34 @@
 package net.tomatentum.marinara;
 
+import net.tomatentum.marinara.registry.InteractionCheckRegistry;
 import net.tomatentum.marinara.registry.InteractionRegistry;
 import net.tomatentum.marinara.wrapper.LibraryWrapper;
 
 public class Marinara {
     
     public static <T extends LibraryWrapper> Marinara load(LibraryWrapper wrapper) {
-        InteractionRegistry registry = new InteractionRegistry(wrapper);
+        return new Marinara(wrapper);
-        return new Marinara(registry);
     }
 
     private InteractionRegistry registry;
+    private InteractionCheckRegistry checkRegistry;
+    private LibraryWrapper wrapper;
 
-    private Marinara(InteractionRegistry registry) {
+    private Marinara(LibraryWrapper wrapper) {
-        this.registry = registry;
+        this.wrapper = wrapper;
+        this.registry = new InteractionRegistry(this);
+        this.checkRegistry = new InteractionCheckRegistry();
     }
 
     public InteractionRegistry getRegistry() {
         return registry;
     }
+
+    public InteractionCheckRegistry getCheckRegistry() {
+        return checkRegistry;
+    }
+
+    public LibraryWrapper getWrapper() {
+        return wrapper;
+    }
 }

lib/src/main/java/net/tomatentum/marinara/checks/AppliedCheck.java

@@ -0,0 +1,41 @@
+package net.tomatentum.marinara.checks;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+
+import net.tomatentum.marinara.util.ReflectionUtil;
+
+public record AppliedCheck(InteractionCheck<?> check, Annotation annotation) {
+    
+    public boolean pre(Object context) {
+        Method[] methods = Arrays.stream(check.getClass().getMethods())
+            .filter(x -> x.getName().equals("preExec"))
+            .filter(x -> !x.isBridge())
+            .toArray(s -> new Method[s]);
+        Method method = ReflectionUtil.getMostSpecificMethod(methods, context.getClass(), annotation.annotationType());
+        method.setAccessible(true);
+        try {
+            return (boolean) method.invoke(check, context, annotation);
+        } catch (IllegalAccessException | InvocationTargetException | SecurityException e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
+
+    public void post(Object context) {
+        Method[] methods = Arrays.stream(check.getClass().getMethods())
+            .filter(x -> x.getName().equals("postExec"))
+            .filter(x -> !x.isBridge())
+            .toArray(s -> new Method[s]);
+        Method method = ReflectionUtil.getMostSpecificMethod(methods, context.getClass(), annotation.annotationType());
+        method.setAccessible(true);
+        try {
+            method.invoke(check, context, annotation);
+        } catch (IllegalAccessException | InvocationTargetException | SecurityException e) {
+            e.printStackTrace();
+        }
+    }
+
+}

lib/src/main/java/net/tomatentum/marinara/checks/InteractionCheck.java

@@ -0,0 +1,10 @@
+package net.tomatentum.marinara.checks;
+
+import java.lang.annotation.Annotation;
+
+public interface InteractionCheck<A extends Annotation> {
+
+    public boolean preExec(Object context, A annotation);
+    public void postExec(Object context, A annotation);
+    
+}

lib/src/main/java/net/tomatentum/marinara/interaction/commands/ExecutableSlashCommandDefinition.java

@@ -16,9 +16,18 @@ public record ExecutableSlashCommandDefinition(
         if (!(o instanceof ExecutableSlashCommandDefinition))
             return false;
         ExecutableSlashCommandDefinition other = (ExecutableSlashCommandDefinition) o;
-        return other.applicationCommand.name().equals(this.applicationCommand.name()) && 
+        boolean equals = false;
-            other.subCommandGroup.name().equals(this.subCommandGroup.name()) &&
+
-            other.subCommand.name().equals(this.subCommand.name());
+        if (this.applicationCommand() != null && other.subCommandGroup() != null)
+            equals = this.applicationCommand.name().equals(other.applicationCommand().name());
+
+        if (this.subCommandGroup() != null && other.subCommandGroup() != null)
+            equals = this.subCommandGroup().name().equals(other.subCommandGroup().name());
+        
+        if (this.subCommand() != null && other.subCommand() != null)
+            equals = this.subCommand().name().equals(other.subCommand().name());
+
+        return equals;
     }
 
     @Override

lib/src/main/java/net/tomatentum/marinara/interaction/methods/ButtonInteractionMethod.java

@@ -2,39 +2,40 @@ package net.tomatentum.marinara.interaction.methods;
 
 import java.lang.reflect.Method;
 
+import net.tomatentum.marinara.Marinara;
 import net.tomatentum.marinara.interaction.InteractionHandler;
 import net.tomatentum.marinara.interaction.InteractionType;
-import net.tomatentum.marinara.interaction.annotation.Button;
+import net.tomatentum.marinara.parser.AnnotationParser;
-import net.tomatentum.marinara.wrapper.LibraryWrapper;
+import net.tomatentum.marinara.parser.ButtonParser;
 
 public class ButtonInteractionMethod extends InteractionMethod {
 
     private String customId;
 
-    ButtonInteractionMethod(Method method, InteractionHandler handler, LibraryWrapper wrapper) {
+    ButtonInteractionMethod(Method method, InteractionHandler handler, Marinara marinara) {
-        super(method, handler, wrapper);
+        super(method, handler, marinara);
-        parseMethod();
+    }
+
+    @Override
+    public AnnotationParser[] getParsers() {
+        return new AnnotationParser[] {
+            new ButtonParser(method, (x) -> { this.customId = x; } )
+        };
     }
 
     @Override
     public Object getParameter(Object parameter, int index) {
         Class<?> type = getMethod().getParameterTypes()[index+1];
-        return wrapper.getComponentContextObject(parameter, type);
+        return marinara.getWrapper().getComponentContextObject(parameter, type);
     }
 
     @Override
     public boolean canRun(Object context) {
-        return wrapper.getButtonId(context).equals(customId);
+        return marinara.getWrapper().getButtonId(context).equals(customId);
     }
 
     @Override
     public InteractionType getType() {
         return InteractionType.BUTTON;
     }
-
-    private void parseMethod() {
-        Button button = getMethod().getAnnotation(Button.class);
-        this.customId = button.value();
-    }
-    
 }

lib/src/main/java/net/tomatentum/marinara/interaction/methods/InteractionMethod.java

@@ -7,35 +7,52 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import net.tomatentum.marinara.Marinara;
+import net.tomatentum.marinara.checks.AppliedCheck;
 import net.tomatentum.marinara.interaction.InteractionHandler;
 import net.tomatentum.marinara.interaction.InteractionType;
 import net.tomatentum.marinara.interaction.annotation.Button;
 import net.tomatentum.marinara.interaction.commands.annotation.SlashCommand;
 import net.tomatentum.marinara.interaction.commands.annotation.SubCommand;
-import net.tomatentum.marinara.wrapper.LibraryWrapper;
+import net.tomatentum.marinara.parser.AnnotationParser;
+import net.tomatentum.marinara.parser.InteractionCheckParser;
 
 public abstract class InteractionMethod {
 
-    public static InteractionMethod create(Method method, InteractionHandler handler, LibraryWrapper wrapper) {
+    public static InteractionMethod create(Method method, InteractionHandler handler, Marinara marinara) {
         if (method.isAnnotationPresent(SlashCommand.class) || method.isAnnotationPresent(SubCommand.class))
-            return new SlashCommandInteractionMethod(method, handler, wrapper);
+            return new SlashCommandInteractionMethod(method, handler, marinara);
         if (method.isAnnotationPresent(Button.class))
-            return new ButtonInteractionMethod(method, handler, wrapper);
+            return new ButtonInteractionMethod(method, handler, marinara);
         return null;
     }
 
     protected Method method;
     protected InteractionHandler handler;
-    protected LibraryWrapper wrapper;
+    protected Marinara marinara;
+    protected List<AnnotationParser> parsers;
+    protected List<AppliedCheck> appliedChecks;
 
-    protected InteractionMethod(Method method, InteractionHandler handler, LibraryWrapper wrapper) {
+    protected InteractionMethod(Method method, 
+        InteractionHandler handler, 
+        Marinara marinara
+        ) {
         if (!Arrays.asList(handler.getClass().getMethods()).contains(method))
             throw new InvalidParameterException("Method does not apply to specified handler");
+
         this.method = method;
         this.handler = handler;
-        this.wrapper = wrapper;
+        this.marinara = marinara;
+        this.parsers = new ArrayList<>(Arrays.asList(getParsers()));
+        this.appliedChecks = new ArrayList<>();
+
+        parsers.add(new InteractionCheckParser(method, appliedChecks::add, marinara.getCheckRegistry()));
+
+        parsers.stream().forEach(AnnotationParser::parse);
     }
 
+    public abstract AnnotationParser[] getParsers();
+
     public abstract Object getParameter(Object parameter, int index);
 
     public abstract boolean canRun(Object context);
@@ -43,6 +60,24 @@ public abstract class InteractionMethod {
     public abstract InteractionType getType();
 
     public void run(Object context) {
+        if (this.appliedChecks.stream().filter(x -> !x.pre(context)).count() > 0)
+            return;
+
+        method.setAccessible(true);
+        try {
+            method.invoke(handler, getParameters(context));
+        }catch (IllegalAccessException | InvocationTargetException ex) {
+            throw new RuntimeException(ex);
+        }
+
+        this.appliedChecks.forEach(x -> x.post(context));
+    }
+
+    public Method getMethod() {
+        return method;
+    }
+
+    private Object[] getParameters(Object context) {
         int parameterCount = method.getParameterCount();
         List<Object> parameters = new ArrayList<>();
         
@@ -53,16 +88,7 @@ public abstract class InteractionMethod {
             }
             parameters.add(getParameter(context, i-1));
         }
-        method.setAccessible(true);
+        return parameters.toArray();
-        try {
-            method.invoke(handler, parameters.toArray());
-        }catch (IllegalAccessException | InvocationTargetException ex) {
-            throw new RuntimeException(ex);
-        }
-    }
-
-    public Method getMethod() {
-        return method;
     }
 
 }

lib/src/main/java/net/tomatentum/marinara/interaction/methods/SlashCommandInteractionMethod.java

@@ -2,32 +2,36 @@ package net.tomatentum.marinara.interaction.methods;
 
 import java.lang.reflect.Method;
 
+import net.tomatentum.marinara.Marinara;
 import net.tomatentum.marinara.interaction.InteractionHandler;
 import net.tomatentum.marinara.interaction.InteractionType;
 import net.tomatentum.marinara.interaction.commands.ExecutableSlashCommandDefinition;
-import net.tomatentum.marinara.interaction.commands.annotation.SlashCommand;
+import net.tomatentum.marinara.parser.AnnotationParser;
-import net.tomatentum.marinara.interaction.commands.annotation.SubCommand;
+import net.tomatentum.marinara.parser.SlashCommandParser;
-import net.tomatentum.marinara.interaction.commands.annotation.SubCommandGroup;
-import net.tomatentum.marinara.util.ReflectionUtil;
-import net.tomatentum.marinara.wrapper.LibraryWrapper;
 
 public class SlashCommandInteractionMethod extends InteractionMethod {
 
     private ExecutableSlashCommandDefinition commandDefinition;
 
-    SlashCommandInteractionMethod(Method method, InteractionHandler handler, LibraryWrapper wrapper) {
+    SlashCommandInteractionMethod(Method method, InteractionHandler handler, Marinara marinara) {
-        super(method, handler, wrapper);
+        super(method, handler, marinara);
-        parseMethod();
+    }
+
+    @Override
+    public AnnotationParser[] getParsers() {
+        return new AnnotationParser[] { 
+            new SlashCommandParser(method, (x) -> { this.commandDefinition = x; } ) 
+        };
     }
 
     @Override
     public Object getParameter(Object context, int index) {
-        return wrapper.convertCommandOption(context, commandDefinition.options()[index].type(), commandDefinition.options()[index].name());
+        return marinara.getWrapper().convertCommandOption(context, commandDefinition.options()[index].type(), commandDefinition.options()[index].name());
     }
 
     @Override
     public boolean canRun(Object context) {
-        ExecutableSlashCommandDefinition other = wrapper.getCommandDefinition(context);
+        ExecutableSlashCommandDefinition other = marinara.getWrapper().getCommandDefinition(context);
         return commandDefinition.equals(other);
     }
 
@@ -40,24 +44,8 @@ public class SlashCommandInteractionMethod extends InteractionMethod {
         return commandDefinition;
     }
 
-    private void parseMethod() {
+    public void setCommandDefinition(ExecutableSlashCommandDefinition commandDefinition) {
-        ReflectionUtil.checkValidCommandMethod(method);
+        this.commandDefinition = commandDefinition;
-
-        SlashCommand cmd = ReflectionUtil.getAnnotation(method, SlashCommand.class);
-        ExecutableSlashCommandDefinition.Builder builder = new ExecutableSlashCommandDefinition.Builder();
-        builder.setApplicationCommand(cmd);
-
-        if (ReflectionUtil.isAnnotationPresent(method, SubCommandGroup.class)) {
-            SubCommandGroup cmdGroup = ReflectionUtil.getAnnotation(method, SubCommandGroup.class);
-            builder.setSubCommandGroup(cmdGroup);
-        }
-
-        if (ReflectionUtil.isAnnotationPresent(method, SubCommand.class)) {
-            SubCommand subCmd = ReflectionUtil.getAnnotation(method, SubCommand.class);
-            builder.setSubCommand(subCmd);
-        }
-
-        this.commandDefinition = builder.build();
     }
 
 }

lib/src/main/java/net/tomatentum/marinara/parser/AnnotationParser.java

@@ -0,0 +1,8 @@
+package net.tomatentum.marinara.parser;
+
+import java.lang.reflect.Method;
+
+public interface AnnotationParser {
+    void parse();
+    Method getMethod();
+}

lib/src/main/java/net/tomatentum/marinara/parser/ButtonParser.java

@@ -0,0 +1,29 @@
+package net.tomatentum.marinara.parser;
+
+import java.lang.reflect.Method;
+import java.util.function.Consumer;
+
+import net.tomatentum.marinara.interaction.annotation.Button;
+
+public class ButtonParser implements AnnotationParser {
+    
+    private Method method;
+    private Consumer<String> consumer;
+
+    public ButtonParser(Method method, Consumer<String> consumer) {
+        this.method = method;
+        this.consumer = consumer;
+    }
+
+    @Override
+    public void parse() {
+        Button button = getMethod().getAnnotation(Button.class);
+        this.consumer.accept(button.value());
+    }
+
+    @Override
+    public Method getMethod() {
+        return this.method;
+    }
+    
+}

lib/src/main/java/net/tomatentum/marinara/parser/InteractionCheckParser.java

@@ -0,0 +1,42 @@
+package net.tomatentum.marinara.parser;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.Optional;
+import java.util.function.Consumer;
+
+import net.tomatentum.marinara.checks.AppliedCheck;
+import net.tomatentum.marinara.checks.InteractionCheck;
+import net.tomatentum.marinara.registry.InteractionCheckRegistry;
+
+public class InteractionCheckParser implements AnnotationParser {
+
+    private InteractionCheckRegistry checkRegistry;
+    private Method method;
+    private Consumer<AppliedCheck> consumer;
+
+    public InteractionCheckParser(Method method, Consumer<AppliedCheck> consumer, InteractionCheckRegistry checkRegistry) {
+        this.checkRegistry = checkRegistry;
+        this.method = method;
+        this.consumer = consumer;
+    }
+
+    @Override
+    public void parse() {
+        Annotation[] annotations = method.getAnnotations();
+        Arrays.stream(annotations).forEach(this::convertAnnotation);
+    }
+
+    private void convertAnnotation(Annotation annotation) {
+            Optional<InteractionCheck<?>> check = this.checkRegistry.getCheckFromAnnotation(annotation.annotationType());
+            if (check.isPresent())
+                consumer.accept(new AppliedCheck(check.get(), annotation));
+    }
+
+    @Override
+    public Method getMethod() {
+        return this.method;
+    }
+    
+}

lib/src/main/java/net/tomatentum/marinara/parser/SlashCommandParser.java

@@ -0,0 +1,63 @@
+package net.tomatentum.marinara.parser;
+
+import java.lang.reflect.Method;
+import java.util.function.Consumer;
+
+import net.tomatentum.marinara.interaction.commands.ExecutableSlashCommandDefinition;
+import net.tomatentum.marinara.interaction.commands.annotation.SlashCommand;
+import net.tomatentum.marinara.interaction.commands.annotation.SubCommand;
+import net.tomatentum.marinara.interaction.commands.annotation.SubCommandGroup;
+import net.tomatentum.marinara.util.ReflectionUtil;
+
+public class SlashCommandParser implements AnnotationParser {
+
+    private Method method;
+    private Consumer<ExecutableSlashCommandDefinition> consumer;
+
+    public SlashCommandParser(Method method, Consumer<ExecutableSlashCommandDefinition> consumer) {
+        this.method = method;
+        this.consumer = consumer;
+    }
+
+    @Override
+    public void parse() {
+        this.checkValidCommandMethod(method);
+
+        SlashCommand cmd = ReflectionUtil.getAnnotation(method, SlashCommand.class);
+        ExecutableSlashCommandDefinition.Builder builder = new ExecutableSlashCommandDefinition.Builder();
+        builder.setApplicationCommand(cmd);
+
+        if (ReflectionUtil.isAnnotationPresent(method, SubCommandGroup.class)) {
+            SubCommandGroup cmdGroup = ReflectionUtil.getAnnotation(method, SubCommandGroup.class);
+            builder.setSubCommandGroup(cmdGroup);
+        }
+
+        if (ReflectionUtil.isAnnotationPresent(method, SubCommand.class)) {
+            SubCommand subCmd = ReflectionUtil.getAnnotation(method, SubCommand.class);
+            builder.setSubCommand(subCmd);
+        }
+
+        consumer.accept(builder.build());
+    }
+
+    @Override
+    public Method getMethod() {
+       return this.method;
+    }
+
+    private void checkValidCommandMethod(Method method) {
+        if (method.isAnnotationPresent(SlashCommand.class) && 
+            method.getDeclaringClass().isAnnotationPresent(SlashCommand.class)) {
+            throw new RuntimeException(method.getName() + ": Can't have ApplicationCommand Annotation on Class and Method");
+        }
+
+        if (!ReflectionUtil.isAnnotationPresent(method, SlashCommand.class))
+            throw new RuntimeException(method.getName() + ": Missing ApplicationCommand Annotation on either Class or Method");
+
+        if ((method.isAnnotationPresent(SubCommand.class) && 
+            !ReflectionUtil.isAnnotationPresent(method, SlashCommand.class))) {
+            throw new RuntimeException(method.getName() + ": Missing ApplicationCommand Annotation on either Method or Class");
+        }
+    }
+    
+}

lib/src/main/java/net/tomatentum/marinara/registry/InteractionCheckRegistry.java

@@ -0,0 +1,34 @@
+package net.tomatentum.marinara.registry;
+
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+import io.leangen.geantyref.GenericTypeReflector;
+import net.tomatentum.marinara.checks.InteractionCheck;
+
+public class InteractionCheckRegistry {
+    
+    private List<InteractionCheck<?>> checks;
+
+    public InteractionCheckRegistry() {
+        this.checks = new ArrayList<>();
+    }
+
+    public void addCheck(InteractionCheck<?> check) {
+        checks.add(check);
+    }
+
+    public Optional<InteractionCheck<?>> getCheckFromAnnotation(Type annotation) {
+        for (InteractionCheck<?> interactionCheck : checks) {
+            ParameterizedType type = (ParameterizedType) GenericTypeReflector.getExactSuperType(interactionCheck.getClass(), InteractionCheck.class);
+            Type typeParam = type.getActualTypeArguments()[0];
+            if (typeParam.equals(annotation))
+                return Optional.of(interactionCheck);
+        }
+        return Optional.empty();
+    }
+
+}

lib/src/main/java/net/tomatentum/marinara/registry/InteractionRegistry.java

@@ -5,27 +5,27 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 
+import net.tomatentum.marinara.Marinara;
 import net.tomatentum.marinara.interaction.InteractionHandler;
 import net.tomatentum.marinara.interaction.InteractionType;
 import net.tomatentum.marinara.interaction.commands.SlashCommandDefinition;
 import net.tomatentum.marinara.interaction.commands.ExecutableSlashCommandDefinition;
 import net.tomatentum.marinara.interaction.methods.SlashCommandInteractionMethod;
 import net.tomatentum.marinara.interaction.methods.InteractionMethod;
-import net.tomatentum.marinara.wrapper.LibraryWrapper;
 
 public class InteractionRegistry {
     private List<InteractionMethod> interactionMethods;
-    private LibraryWrapper wrapper;
+    private Marinara marinara;
 
-    public InteractionRegistry(LibraryWrapper wrapper) {
+    public InteractionRegistry(Marinara marinara) {
         this.interactionMethods = new ArrayList<>();
-        this.wrapper = wrapper;
+        this.marinara = marinara;
-        wrapper.subscribeInteractions(this::handle);
+        marinara.getWrapper().subscribeInteractions(this::handle);
     }
 
     public void addInteractions(InteractionHandler interactionHandler) {
         for (Method method : interactionHandler.getClass().getMethods()) {
-            InteractionMethod iMethod = InteractionMethod.create(method, interactionHandler, wrapper);
+            InteractionMethod iMethod = InteractionMethod.create(method, interactionHandler, marinara);
             if (iMethod != null)
                 this.interactionMethods.add(iMethod);
         }
@@ -48,13 +48,13 @@ public class InteractionRegistry {
                 defs.add(new SlashCommandDefinition(def.applicationCommand()).addExecutableCommand(def));
         });
 
-        wrapper.registerSlashCommands(defs.toArray(new SlashCommandDefinition[0]));
+        marinara.getWrapper().registerSlashCommands(defs.toArray(new SlashCommandDefinition[0]));
     }
 
     public void handle(Object context) {
         interactionMethods.forEach((m) -> {
-            InteractionType type = wrapper.getInteractionType(context.getClass());
+            InteractionType type = marinara.getWrapper().getInteractionType(context.getClass());
-            if (m.getType().equals(type))
+            if (m.getType().equals(type) && m.canRun(context))
                 m.run(context);
         });
     }

lib/src/main/java/net/tomatentum/marinara/util/ReflectionUtil.java

@@ -2,9 +2,10 @@ package net.tomatentum.marinara.util;
 
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Method;
-
+import java.util.ArrayList;
-import net.tomatentum.marinara.interaction.commands.annotation.SlashCommand;
+import java.util.Arrays;
-import net.tomatentum.marinara.interaction.commands.annotation.SubCommand;
+import java.util.List;
+import java.util.Objects;
 
 public final class ReflectionUtil {
 
@@ -21,19 +22,82 @@ public final class ReflectionUtil {
             method.getDeclaringClass().getAnnotation(annotationClass);
     }
 
-    public static void checkValidCommandMethod(Method method) {
+    public static int getCastDepth(Class<?> child, Class<?> parent) {
-        if (method.isAnnotationPresent(SlashCommand.class) && 
+
-            method.getDeclaringClass().isAnnotationPresent(SlashCommand.class)) {
+        if (parent.equals(Object.class))
-            throw new RuntimeException(method.getName() + ": Can't have ApplicationCommand Annotation on Class and Method");
+            return Integer.MAX_VALUE;
+
+        if (!parent.isAssignableFrom(child)) {
+            throw new IllegalArgumentException("The specified class is not a child class of the specified parent.");
         }
 
-        if (!isAnnotationPresent(method, SlashCommand.class))
+        int depth = 0;
-            throw new RuntimeException(method.getName() + ": Missing ApplicationCommand Annotation on either Class or Method");
+        Class<?> curr = child;
+        List<Class<?>> parents = new ArrayList<>();
 
-        if ((method.isAnnotationPresent(SubCommand.class) && 
+        while (!curr.equals(parent)) {
-            !isAnnotationPresent(method, SlashCommand.class))) {
+            depth++;
-            throw new RuntimeException(method.getName() + ": Missing ApplicationCommand Annotation on either Method or Class");
+            parents.add(curr.getSuperclass());
+            parents.addAll(Arrays.asList(curr.getInterfaces()));
+
+            for (Class<?> currParent : parents) {
+                if (currParent != null && parent.isAssignableFrom(currParent)) {
+                    curr = currParent;
+                    break;
+                }
+            }
+            parents.clear();
         }
+
+        return depth;
     }
     
+    public static Method getMostSpecificMethod(Method[] methods, Class<?>... parameters) {
+        List<Method> compatibleMethods = Arrays.stream(methods)
+            .filter(x -> isMethodCallable(x, parameters))
+            .toList();
+
+        if (compatibleMethods.size() == 0)
+            throw new IllegalArgumentException("There are no compatible Methods provided");
+
+        for (int i = 0; i < parameters.length; i++) {
+            final int currI = i;
+            Class<?>[] parameterTypes = compatibleMethods.stream()
+                .map(x -> x.getParameterTypes()[currI])
+                .toArray(x -> new Class[x]);
+
+            Class<?> mostSpecific = getMostSpecificClass(parameterTypes, parameters[i]);
+
+            compatibleMethods = compatibleMethods.stream()
+                .filter(x -> Objects.equals(x.getParameterTypes()[currI], mostSpecific))
+                .toList();
+        }
+        
+        return compatibleMethods.getFirst();
+    }
+
+    public static Class<?> getMostSpecificClass(Class<?>[] classes, Class<?> base) {
+        int min = Integer.MAX_VALUE;
+        Class<?> currMostSpecific = null;
+        for (Class<?> currClass : classes) {
+            int currCastDepth = getCastDepth(base, currClass);
+            if (currCastDepth <= min) {
+                min = currCastDepth;
+                currMostSpecific = currClass;
+            }
+        }
+        return currMostSpecific;
+    }
+
+    public static boolean isMethodCallable(Method method, Class<?>... parameters) {
+        if (!Objects.equals(method.getParameterCount(), parameters.length))
+            return false;
+
+        Class<?>[] methodParams = method.getParameterTypes();
+        for (int i = 0; i < parameters.length; i++) {
+            if (!methodParams[i].isAssignableFrom(parameters[i]))
+                return false;
+        }
+        return true;
+    }
 }

wrapper/javacord/build.gradle.kts

@@ -29,7 +29,7 @@ dependencies {
 // Apply a specific Java toolchain to ease working on different environments.
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(21)
+        languageVersion = JavaLanguageVersion.of(23)
     }
 }
 

wrapper/javacord/src/main/java/net/tomatentum/marinara/wrapper/javacord/checks/PermissionCheck.java

@@ -0,0 +1,41 @@
+package net.tomatentum.marinara.wrapper.javacord.checks;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import java.util.Optional;
+
+import org.javacord.api.entity.permission.PermissionType;
+import org.javacord.api.entity.server.Server;
+import org.javacord.api.interaction.InteractionBase;
+
+import net.tomatentum.marinara.checks.InteractionCheck;
+
+public class PermissionCheck implements InteractionCheck<PermissionCheck.HasPermission> {
+
+    @Retention(RetentionPolicy.RUNTIME)
+    @Target(ElementType.METHOD)
+    public static @interface HasPermission {
+        public PermissionType[] value();
+    }
+
+    @Override
+    public boolean preExec(Object context, HasPermission annotation) {
+        throw new UnsupportedOperationException("Unimplemented method 'preExec'");
+    }
+
+    public boolean preExec(InteractionBase context, HasPermission annotation) {
+        Optional<Server> server = context.getServer();
+        if (!server.isPresent())
+            return false;
+
+       return server.get().hasPermissions(context.getUser(), annotation.value());
+    }
+
+    @Override
+    public void postExec(Object context, HasPermission annotation) {
+        
+    }
+    
+}

wrapper/javacord/src/test/java/net/tomatentum/marinara/test/ButtonTest.java

@@ -20,7 +20,7 @@ public class ButtonTest {
         LibraryWrapper wrapper = new JavacordWrapper(new DiscordApiMock()); //null okay as we don't use the discord API in this test.
         Marinara marinara = Marinara.load(wrapper);
         marinara.getRegistry().addInteractions(new TestButton());
-        wrapper.handleInteraction(new ButtonInteractionMock());
+        wrapper.handleInteraction(new ButtonInteractionMock("test"));
         assertTrue(TestButton.didRun);
     }
     

wrapper/javacord/src/test/java/net/tomatentum/marinara/test/InteractionCheckTest.java

@@ -0,0 +1,47 @@
+package net.tomatentum.marinara.test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.javacord.api.entity.permission.PermissionType;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.api.TestInstance.Lifecycle;
+
+import net.tomatentum.marinara.Marinara;
+import net.tomatentum.marinara.test.mocks.ButtonInteractionMock;
+import net.tomatentum.marinara.test.mocks.DiscordApiMock;
+import net.tomatentum.marinara.test.mocks.ServerMock;
+import net.tomatentum.marinara.wrapper.LibraryWrapper;
+import net.tomatentum.marinara.wrapper.javacord.JavacordWrapper;
+import net.tomatentum.marinara.wrapper.javacord.checks.PermissionCheck;
+
+@TestInstance(Lifecycle.PER_CLASS)
+public class InteractionCheckTest {
+    
+    @Test
+    public void testInteractionCheck() {
+        LibraryWrapper wrapper = new JavacordWrapper(new DiscordApiMock());
+        Marinara marinara = Marinara.load(wrapper);
+        marinara.getCheckRegistry().addCheck(new TestInteractionCheck());
+        marinara.getRegistry().addInteractions(new TestButton());
+        wrapper.handleInteraction(new ButtonInteractionMock("test"));
+        assertTrue(TestInteractionCheck.preExecuted);
+        assertTrue(TestInteractionCheck.postExecuted);
+    }
+
+    @Test
+    public void testPermissionCheck() {
+        LibraryWrapper wrapper = new JavacordWrapper(new DiscordApiMock());
+        Marinara marinara = Marinara.load(wrapper);
+        marinara.getCheckRegistry().addCheck(new PermissionCheck());
+        marinara.getRegistry().addInteractions(new TestButton());
+        wrapper.handleInteraction(new ButtonInteractionMock("permissionCheck"));
+        assertTrue(TestButton.didPermRun);
+        TestButton.didPermRun = false;
+        ServerMock.TESTPERMISSION = PermissionType.ATTACH_FILE;
+        wrapper.handleInteraction(new ButtonInteractionMock("permissionCheck"));
+        assertFalse(TestButton.didPermRun);
+    }
+
+}

wrapper/javacord/src/test/java/net/tomatentum/marinara/test/TestButton.java

@@ -4,18 +4,22 @@ import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import org.javacord.api.entity.channel.TextChannel;
 import org.javacord.api.entity.message.Message;
+import org.javacord.api.entity.permission.PermissionType;
 import org.javacord.api.entity.server.Server;
 import org.javacord.api.entity.user.User;
 import org.javacord.api.interaction.ButtonInteraction;
 
 import net.tomatentum.marinara.interaction.InteractionHandler;
 import net.tomatentum.marinara.interaction.annotation.Button;
+import net.tomatentum.marinara.test.TestInteractionCheck.TestCheck;
+import net.tomatentum.marinara.wrapper.javacord.checks.PermissionCheck.HasPermission;
 
 public class TestButton implements InteractionHandler {
 
 
     public static boolean didRun = false;
     @Button("test")
+    @TestCheck
     public void exec(ButtonInteraction interaction, TextChannel channel, Message message, User member, Server server) {
         assertNotNull(interaction);
         assertNotNull(channel);
@@ -25,5 +29,14 @@ public class TestButton implements InteractionHandler {
         didRun = true;
         System.out.println("Success!");
     }
+
+    public static boolean didPermRun = false;
+
+    @Button("permissionCheck")
+    @HasPermission({PermissionType.ADMINISTRATOR})
+    public void exec(ButtonInteraction interaction) {
+        didPermRun = true;
+        System.out.println("It worked!");
+    }
     
 }

wrapper/javacord/src/test/java/net/tomatentum/marinara/test/TestInteractionCheck.java

@@ -0,0 +1,37 @@
+package net.tomatentum.marinara.test;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import net.tomatentum.marinara.checks.InteractionCheck;
+
+public class TestInteractionCheck implements InteractionCheck<TestInteractionCheck.TestCheck> {
+
+    public static boolean preExecuted = false;
+    public static boolean postExecuted = false;
+
+    @Target({ElementType.METHOD})
+    @Retention(RetentionPolicy.RUNTIME)
+    public static @interface TestCheck {
+    }
+
+    @Override
+    public boolean preExec(Object context, TestCheck annotation) {
+        assertNotNull(annotation);
+        assertNotNull(context);
+        preExecuted = true;
+        return true;
+    }
+
+    @Override
+    public void postExec(Object context, TestCheck annotation) {
+        assertNotNull(annotation);
+        assertNotNull(context);
+        postExecuted = true;
+    }
+    
+}

wrapper/javacord/src/test/java/net/tomatentum/marinara/test/mocks/ButtonInteractionMock.java

@@ -23,6 +23,12 @@ import org.javacord.api.interaction.callback.InteractionOriginalResponseUpdater;
 
 public class ButtonInteractionMock implements ButtonInteraction {
 
+    private String customId;
+    
+    public ButtonInteractionMock(String customId) {
+        this.customId = customId;
+    }
+
     @Override
     public Message getMessage() {
         return new MessageMock();
@@ -30,7 +36,7 @@ public class ButtonInteractionMock implements ButtonInteraction {
 
     @Override
     public String getCustomId() {
-        return "test";
+        return this.customId;
     }
 
     @Override

wrapper/javacord/src/test/java/net/tomatentum/marinara/test/mocks/ServerMock.java

@@ -1,5 +1,7 @@
 package net.tomatentum.marinara.test.mocks;
 
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
 import java.time.Instant;
 import java.util.Collection;
 import java.util.EnumSet;
@@ -27,6 +29,7 @@ import org.javacord.api.entity.channel.ServerTextChannel;
 import org.javacord.api.entity.channel.ServerThreadChannel;
 import org.javacord.api.entity.channel.ServerVoiceChannel;
 import org.javacord.api.entity.emoji.KnownCustomEmoji;
+import org.javacord.api.entity.permission.PermissionType;
 import org.javacord.api.entity.permission.Role;
 import org.javacord.api.entity.server.ActiveThreads;
 import org.javacord.api.entity.server.Ban;
@@ -2259,5 +2262,12 @@ public class ServerMock implements Server {
         // TODO Auto-generated method stub
         throw new UnsupportedOperationException("Unimplemented method 'getSystemChannelFlags'");
     }
+    public static PermissionType TESTPERMISSION = PermissionType.ADMINISTRATOR;
+    @Override
+    public boolean hasPermissions(User user, PermissionType... type) {
+        assertNotNull(user);
+        assertNotNull(type);
+        return TESTPERMISSION.equals(type[0]);
+    }
     
 }