Optimize SWCommand

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

@@ -22,13 +22,11 @@ package de.steamwar.command;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 
-import java.lang.annotation.ElementType;
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-import java.lang.annotation.Target;
+import java.lang.annotation.*;
 import java.lang.reflect.Method;
 import java.lang.reflect.Parameter;
 import java.util.*;
+import java.util.function.IntPredicate;
 
 import static de.steamwar.command.SWCommandUtils.getAnnotation;
 
@@ -79,81 +77,63 @@ public abstract class SWCommand {
 
         Set<Method> commandMethods = new HashSet<>();
         for (Method method : getClass().getDeclaredMethods()) {
-            addMapper(method);
-            addCommand(method, commandMethods);
-            addHelp(method);
+            add(Mapper.class, method, i -> i != 0, false, TypeMapper.class, (anno, method1, parameters) -> {
+                try {
+                    method.setAccessible(true);
+                    Object object = method.invoke(this);
+                    SWCommandUtils.addMapper(anno.value(), (TypeMapper<?>) object);
+                } catch (Exception e) {
+                    throw new SecurityException(e.getMessage(), e);
+                }
+            });
+            add(Register.class, method, i -> i == 0, true, null, (anno, method1, parameters) -> {
+                for (int i = 1; i < parameters.length; i++) {
+                    Parameter parameter = parameters[i];
+                    Class<?> clazz = parameter.getType();
+                    if (parameter.isVarArgs() && i == parameters.length - 1) {
+                        clazz = parameter.getType().getComponentType();
+                    }
+                    Mapper mapper = parameter.getAnnotation(Mapper.class);
+                    if (clazz.isEnum() && mapper == null && !SWCommandUtils.MAPPER_FUNCTIONS.containsKey(clazz.getTypeName())) {
+                        continue;
+                    }
+                    String name = clazz.getTypeName();
+                    if (mapper != null) {
+                        name = mapper.value();
+                    }
+                    if (!SWCommandUtils.MAPPER_FUNCTIONS.containsKey(name)) return;
+                }
+                commandMethods.add(method);
+            });
+            add(RegisterHelp.class, method, i -> i != 1, true, null, (anno, method1, parameters) -> {
+                commandHelpSet.add(new SubCommand(this, method));
+            });
         }
         commandMethods.forEach(method -> commandSet.add(new SubCommand(this, method)));
     }
 
-    private void addCommand(Method method, Set<Method> commandMethods) {
-        Register register = getAnnotation(method, Register.class);
-        if (register == null) {
+    private <T extends Annotation> void add(Class<T> annotation, Method method, IntPredicate parameterTester, boolean firstParameter, Class<?> returnType, SWConsumer<T> consumer) {
+        T anno = getAnnotation(method, annotation);
+        if (anno == null) {
             return;
         }
 
         Parameter[] parameters = method.getParameters();
-        if (parameters.length == 0) {
+        if (parameterTester.test(parameters.length)) {
             return;
         }
-        if (!CommandSender.class.isAssignableFrom(parameters[0].getType())) {
+        if (firstParameter && !CommandSender.class.isAssignableFrom(parameters[0].getType())) {
             return;
         }
-        for (int i = 1; i < parameters.length; i++) {
-            Parameter parameter = parameters[i];
-            Class<?> clazz = parameter.getType();
-            if (parameter.isVarArgs() && i == parameters.length - 1) {
-                clazz = parameter.getType().getComponentType();
-            }
-            Mapper mapper = parameter.getAnnotation(Mapper.class);
-            if (clazz.isEnum() && mapper == null && !SWCommandUtils.MAPPER_FUNCTIONS.containsKey(clazz.getTypeName())) {
-                continue;
-            }
-            String name = clazz.getTypeName();
-            if (mapper != null) {
-                name = mapper.value();
-            }
-            if (!SWCommandUtils.MAPPER_FUNCTIONS.containsKey(name)) return;
+        if (returnType != null && method.getReturnType() != returnType) {
+            return;
         }
-        commandMethods.add(method);
+        consumer.consume(anno, method, parameters);
     }
 
-    private void addHelp(Method method) {
-        RegisterHelp registerHelp = getAnnotation(method, RegisterHelp.class);
-        if (registerHelp == null) {
-            return;
-        }
-
-        Parameter[] parameters = method.getParameters();
-        if (parameters.length != 1) {
-            return;
-        }
-        if (!CommandSender.class.isAssignableFrom(parameters[0].getType())) {
-            return;
-        }
-        commandHelpSet.add(new SubCommand(this, method));
-    }
-
-    private void addMapper(Method method) {
-        Mapper mapper = getAnnotation(method, Mapper.class);
-        if (mapper == null) {
-            return;
-        }
-
-        Parameter[] parameters = method.getParameters();
-        if (parameters.length != 0) {
-            return;
-        }
-        if (method.getReturnType() != TypeMapper.class) {
-            return;
-        }
-        try {
-            method.setAccessible(true);
-            Object object = method.invoke(this);
-            SWCommandUtils.addMapper(mapper.value(), (TypeMapper<?>) object);
-        } catch (Exception e) {
-            throw new SecurityException(e.getMessage(), e);
-        }
+    @FunctionalInterface
+    private interface SWConsumer<T extends Annotation> {
+        void consume(T anno, Method method, Parameter[] parameters);
     }
 
     @Retention(RetentionPolicy.RUNTIME)