feat: add methodtype loading using service loader

Author: JonasDevDE

annotationprocessor/src/main/java/com/interguess/autoimpl/annotationprocessor/generator/ImplementationClassGenerator.java

@@ -30,8 +30,6 @@
 import com.interguess.autoimpl.api.method.MethodType;
 import com.interguess.autoimpl.api.method.MethodTypeMatcher;
 import com.interguess.autoimpl.common.method.MethodTypeMatcherImpl;
-import com.interguess.autoimpl.common.methodtypes.GetMethod;
-import com.interguess.autoimpl.common.methodtypes.SetMethod;
 import org.jetbrains.annotations.NotNull;
 
 import javax.annotation.processing.ProcessingEnvironment;
@@ -54,10 +52,7 @@ public class ImplementationClassGenerator {
     public ImplementationClassGenerator(final @NotNull ProcessingEnvironment processingEnv) {
         this.processingEnv = processingEnv;
 
-        this.methodTypeMatcher = new MethodTypeMatcherImpl();
-
-        this.methodTypeMatcher.registerType("get[a-zA-Z0-9_]+", new GetMethod());
-        this.methodTypeMatcher.registerType("set[a-zA-Z0-9_]+", new SetMethod());
+        this.methodTypeMatcher = MethodTypeMatcherImpl.getInstance();
     }
 
     public void generateForInterface(final @NotNull TypeElement interfaceElement) {

annotationprocessor/src/main/java/com/interguess/autoimpl/annotationprocessor/processors/AutoImplProcessor.java

@@ -27,6 +27,10 @@
 import com.google.auto.service.AutoService;
 import com.interguess.autoimpl.annotationprocessor.generator.ImplementationClassGenerator;
 import com.interguess.autoimpl.api.annotations.AutoImpl;
+import com.interguess.autoimpl.api.annotations.RegisterMethod;
+import com.interguess.autoimpl.api.method.MethodType;
+import com.interguess.autoimpl.api.method.MethodTypeMatcher;
+import com.interguess.autoimpl.common.method.MethodTypeMatcherImpl;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -36,6 +40,7 @@
 import javax.lang.model.element.ElementKind;
 import javax.lang.model.element.TypeElement;
 import javax.tools.Diagnostic;
+import java.util.ServiceLoader;
 import java.util.Set;
 
 @AutoService(Processor.class)
@@ -50,6 +55,39 @@ public class AutoImplProcessor extends AbstractProcessor {
     public synchronized void init(final @NotNull ProcessingEnvironment processingEnv) {
         super.init(processingEnv);
 
+        MethodTypeMatcher.setInstance(new MethodTypeMatcherImpl());
+
+        processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE, "Loading MethodType implementations...");
+
+        ServiceLoader.load(MethodType.class, MethodType.class.getClassLoader()).forEach(methodType -> {
+            processingEnv.getMessager().printMessage(
+                    Diagnostic.Kind.NOTE,
+                    "Registering MethodType: " + methodType.getClass().getName()
+            );
+
+            final RegisterMethod registerAnnotation = methodType.getClass().getAnnotation(RegisterMethod.class);
+
+            if (registerAnnotation == null) {
+                processingEnv.getMessager().printMessage(
+                        Diagnostic.Kind.ERROR,
+                        "MethodType " + methodType.getClass().getName() + " is missing @RegisterMethod annotation."
+                );
+                return;
+            }
+
+            System.out.println(methodType.getClass().getName());
+
+            MethodTypeMatcher.getInstance().registerType(
+                    registerAnnotation.value(),
+                    methodType
+            );
+        });
+
+        processingEnv.getMessager().printMessage(
+                Diagnostic.Kind.NOTE,
+                "MethodType implementations loaded successfully."
+        );
+
         this.classGenerator = new ImplementationClassGenerator(processingEnv);
     }
 

api/src/main/java/com/interguess/autoimpl/api/annotations/RegisterMethod.java

@@ -0,0 +1,49 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2025 Interguess.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package com.interguess.autoimpl.api.annotations;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * This annotation is used to mark method type classes that should be registered.
+ * The annotation processor will scan for classes annotated with this
+ * annotation and registers them before processing the @AutoImpl annotation.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface RegisterMethod {
+
+    /**
+     * The regex pattern to match the method name.
+     *
+     * @return The regex pattern as a string.
+     */
+    @NotNull String value();
+}

common/src/main/java/com/interguess/autoimpl/common/methodtypes/GetMethod.java

@@ -26,6 +26,7 @@
 
 import com.google.common.base.Preconditions;
 import com.interguess.autoimpl.api.annotations.AutoField;
+import com.interguess.autoimpl.api.annotations.RegisterMethod;
 import com.interguess.autoimpl.api.field.GeneratedField;
 import com.interguess.autoimpl.api.method.MethodType;
 import com.interguess.autoimpl.common.field.GeneratedFieldImpl;
@@ -34,6 +35,7 @@
 import javax.lang.model.element.ExecutableElement;
 import java.util.List;
 
+@RegisterMethod("get[a-zA-Z0-9_]+")
 public class GetMethod implements MethodType {
 
     @Override

common/src/main/java/com/interguess/autoimpl/common/methodtypes/SetMethod.java

@@ -26,6 +26,7 @@
 
 import com.google.common.base.Preconditions;
 import com.interguess.autoimpl.api.annotations.AutoField;
+import com.interguess.autoimpl.api.annotations.RegisterMethod;
 import com.interguess.autoimpl.api.field.GeneratedField;
 import com.interguess.autoimpl.api.method.MethodType;
 import com.interguess.autoimpl.common.field.GeneratedFieldImpl;
@@ -34,6 +35,7 @@
 import javax.lang.model.element.ExecutableElement;
 import java.util.List;
 
+@RegisterMethod("set[a-zA-Z0-9_]+")
 public class SetMethod implements MethodType {
 
     @Override

common/src/main/resources/META-INF/services/com.interguess.autoimpl.api.method.MethodType

@@ -0,0 +1,2 @@
+com.interguess.autoimpl.common.methodtypes.GetMethod
+com.interguess.autoimpl.common.methodtypes.SetMethod