diff --git a/docs/attributes.md b/docs/attributes.md
index 97f73c7..a626738 100644
--- a/docs/attributes.md
+++ b/docs/attributes.md
@@ -205,6 +205,7 @@ will cause a `RealRoute` to be appended in the routes array.
 use Aura\Di\Attribute\AttributeConfigFor;
 use Aura\Di\ClassScanner\AttributeConfigInterface;
 use Aura\Di\ClassScanner\AttributeSpecification;
+use Aura\Di\ClassScanner\ClassSpecification;
 use Aura\Di\Container;
 
 #[\Attribute]
@@ -213,7 +214,7 @@ class Route implements AttributeConfigInterface {
     public function __construct(private string $method, private string $uri) {
     }
     
-    public static function define(Container $di, AttributeSpecification $specification): void
+    public static function define(Container $di, AttributeSpecification $specification, ClassSpecification $classSpecification): void
     {
         if ($specification->getAttributeTarget() === \Attribute::TARGET_METHOD) {
             /** @var self $attribute */
@@ -259,15 +260,16 @@ you can create an implementation of `AttributeConfigInterface` yourself, and ann
 use Aura\Di\Attribute\AttributeConfigFor;
 use Aura\Di\ClassScanner\AttributeConfigInterface;
 use Aura\Di\ClassScanner\AttributeSpecification;
+use Aura\Di\ClassScanner\ClassSpecification;
 use Aura\Di\Container;
 use Symfony\Component\Routing\Attribute\Route;
 
 #[AttributeConfigFor(Route::class)]
 class SymfonyRouteAttributeConfig implements AttributeConfigInterface
 {
-    public static function define(Container $di, AttributeSpecification $specification): void
+    public static function define(Container $di, AttributeSpecification $specification, ClassSpecification $classSpecification): void
     {
-        if ($specification->getAttributeTarget() === \Attribute::TARGET_METHOD) {
+        if ($specification->isMethodAttribute()) {
             /** @var Route $attribute */
             $attribute = $specification->getAttributeInstance();
             
diff --git a/src/ClassScanner/AnnotatedInjectAttributeConfig.php b/src/ClassScanner/AnnotatedInjectAttributeConfig.php
index 1391241..3fab1bb 100644
--- a/src/ClassScanner/AnnotatedInjectAttributeConfig.php
+++ b/src/ClassScanner/AnnotatedInjectAttributeConfig.php
@@ -15,14 +15,16 @@
 
 final class AnnotatedInjectAttributeConfig implements AttributeConfigInterface
 {
-    private const CONSTRUCTOR_NAME = '__construct';
-
-    public static function define(Container $di, AttributeSpecification $specification): void
+    public static function define(
+        Container $di,
+        AttributeSpecification $attributeSpecification,
+        ClassSpecification $classSpecification
+    ): void
     {
-        /** @var AnnotatedInjectInterface $attribute */
-        $attribute = $specification->getAttributeInstance();
-        if ($specification->getTargetMethod() === self::CONSTRUCTOR_NAME && $specification->getAttributeTarget() === \Attribute::TARGET_PARAMETER) {
-            $di->params[$specification->getClassName()][$specification->getTargetParameter()] = $attribute->inject();
+        if ($attributeSpecification->isConstructorParameterAttribute()) {
+            /** @var AnnotatedInjectInterface $attribute */
+            $attribute = $attributeSpecification->getAttributeInstance();
+            $di->params[$attributeSpecification->getClassName()][$attributeSpecification->getTargetParameter()] = $attribute->inject();
         }
     }
 }
\ No newline at end of file
diff --git a/src/ClassScanner/AttributeConfigInterface.php b/src/ClassScanner/AttributeConfigInterface.php
index 51e606a..7be8260 100644
--- a/src/ClassScanner/AttributeConfigInterface.php
+++ b/src/ClassScanner/AttributeConfigInterface.php
@@ -14,5 +14,9 @@
 
 interface AttributeConfigInterface
 {
-    public static function define(Container $di, AttributeSpecification $specification): void;
+    public static function define(
+        Container $di,
+        AttributeSpecification $attributeSpecification,
+        ClassSpecification $classSpecification
+    ): void;
 }
\ No newline at end of file
diff --git a/src/ClassScanner/AttributeSpecification.php b/src/ClassScanner/AttributeSpecification.php
index fb66ea2..c54b519 100644
--- a/src/ClassScanner/AttributeSpecification.php
+++ b/src/ClassScanner/AttributeSpecification.php
@@ -6,6 +6,7 @@
 
 final class AttributeSpecification
 {
+    private const CONSTRUCTOR_NAME = '__construct';
     private object $attributeInstance;
     private string $className;
     private int $attributeTarget;
@@ -64,4 +65,34 @@ public function getTargetConstant(): ?string
     {
         return $this->targetConfig['constant'] ?? null;
     }
+
+    public function isConstructorParameterAttribute(): bool
+    {
+        return $this->attributeTarget === \Attribute::TARGET_PARAMETER && ($this->targetConfig['method'] ?? '') === self::CONSTRUCTOR_NAME;
+    }
+
+    public function isMethodAttribute(): bool
+    {
+        return $this->attributeTarget === \Attribute::TARGET_METHOD;
+    }
+
+    public function isClassAttribute(): bool
+    {
+        return $this->attributeTarget === \Attribute::TARGET_CLASS;
+    }
+
+    public function isParameterAttribute(): bool
+    {
+        return $this->attributeTarget === \Attribute::TARGET_PARAMETER;
+    }
+
+    public function isPropertyAttribute(): bool
+    {
+        return $this->attributeTarget === \Attribute::TARGET_PROPERTY;
+    }
+
+    public function isClassConstantAttribute(): bool
+    {
+        return $this->attributeTarget === \Attribute::TARGET_CLASS_CONSTANT;
+    }
 }
\ No newline at end of file
diff --git a/src/ClassScanner/BlueprintAttributeConfig.php b/src/ClassScanner/BlueprintAttributeConfig.php
index 0626a5d..7a80b02 100644
--- a/src/ClassScanner/BlueprintAttributeConfig.php
+++ b/src/ClassScanner/BlueprintAttributeConfig.php
@@ -14,8 +14,12 @@
 
 final class BlueprintAttributeConfig implements AttributeConfigInterface
 {
-    public static function define(Container $di, AttributeSpecification $specification): void
+    public static function define(
+        Container $di,
+        AttributeSpecification $attributeSpecification,
+        ClassSpecification $classSpecification
+    ): void
     {
-        $di->params[$specification->getClassName()] = $di->params[$specification->getClassName()] ?? [];
+        $di->params[$attributeSpecification->getClassName()] = $di->params[$attributeSpecification->getClassName()] ?? [];
     }
 }
\ No newline at end of file
diff --git a/src/ClassScanner/ClassMap.php b/src/ClassScanner/ClassMap.php
index 466aa6b..4ff367d 100644
--- a/src/ClassScanner/ClassMap.php
+++ b/src/ClassScanner/ClassMap.php
@@ -11,7 +11,7 @@ final class ClassMap
     private array $scanPaths;
     /** @var array<string, class-string> */
     private array $filesToClass = [];
-    /** @var array<class-string, array<int, AttributeSpecification>> */
+    /** @var array<class-string, ClassSpecification> */
     private array $classesToAttributes = [];
 
     /**
@@ -23,13 +23,10 @@ public function __construct(array $scanPaths, string $basePath)
         $this->basePath = $basePath;
     }
 
-    /**
-     * @param array<int, AttributeSpecification> $attributeSpecifications
-     */
-    public function addClass(string $class, string $filename, array $attributeSpecifications): void
+    public function addClass(ClassSpecification $classSpecification): void
     {
-        $this->filesToClass[$filename] = $class;
-        $this->classesToAttributes[$class] = $attributeSpecifications;
+        $this->filesToClass[$classSpecification->getFilename()] = $classSpecification->getClassName();
+        $this->classesToAttributes[$classSpecification->getClassName()] = $classSpecification;
     }
 
     public function remove(string $filename): void
@@ -54,12 +51,13 @@ public function getFiles(): array
         return \array_keys($this->filesToClass);
     }
 
-    /**
-     * @return array<int, AttributeSpecification>
-     */
-    public function getAttributeSpecificationsFor(string $className): array
+    public function getClassSpecificationFor(string $className): ?ClassSpecification
     {
-        return $this->classesToAttributes[$className] ?? [];
+        if (\array_key_exists($className, $this->classesToAttributes)) {
+            return $this->classesToAttributes[$className];
+        }
+
+        throw new \InvalidArgumentException('Cannot find class specification for: ' . $className);
     }
 
     /**
@@ -67,7 +65,13 @@ public function getAttributeSpecificationsFor(string $className): array
      */
     public function getAttributeSpecifications(): array
     {
-        return \array_merge([], ...array_values($this->classesToAttributes));
+        return \array_merge(
+            [],
+            ...\array_values(array_map(
+                fn (ClassSpecification $classSpecification) => $classSpecification->getAttributes(),
+                $this->classesToAttributes
+            ))
+        );
     }
 
     public function isAttributeClassFile(string $filename): bool
@@ -81,14 +85,8 @@ public function isAttributeClassFile(string $filename): bool
             return false;
         }
 
-        $attributeSpecifications = $this->classesToAttributes[$class];
-        foreach ($attributeSpecifications as $specification) {
-            if ($specification->getAttributeInstance() instanceof \Attribute) {
-                return true;
-            }
-        }
 
-        return false;
+        return $this->classesToAttributes[$class]->isAttributeClass();
     }
 
     public function merge(ClassMap $other): ClassMap
@@ -110,7 +108,7 @@ public function saveToFileHandle($fileHandle): void
         foreach ($this->filesToClass as $filename => $className) {
             $classMapJson['files'][$filename] = $className;
 
-            if ($attributeSpecifications = $this->getAttributeSpecificationsFor($className)) {
+            if ($attributeSpecifications = $this->getClassSpecificationFor($className)->getAttributes()) {
                 $classMapJson['attributes'][$className] = \array_map(
                     fn (AttributeSpecification $attribute) => \serialize($attribute),
                     $attributeSpecifications
@@ -143,11 +141,13 @@ public static function fromFileHandle($fileHandle): ClassMap
 
         foreach ($cacheContentsJson['files'] as $filename => $className) {
             $classMap->addClass(
-                $className,
-                $filename,
-                \array_map(
-                    fn (string $serializedAttributeSpecification) => \unserialize($serializedAttributeSpecification),
-                    $cacheContentsJson['attributes'][$className] ?? []
+                new ClassSpecification(
+                    $className,
+                    $filename,
+                    \array_map(
+                        fn (string $serializedAttributeSpecification) => \unserialize($serializedAttributeSpecification),
+                        $cacheContentsJson['attributes'][$className] ?? []
+                    )
                 )
             );
         }
diff --git a/src/ClassScanner/ClassScannerConfig.php b/src/ClassScanner/ClassScannerConfig.php
index aea275e..a1d3dfe 100644
--- a/src/ClassScanner/ClassScannerConfig.php
+++ b/src/ClassScanner/ClassScannerConfig.php
@@ -64,13 +64,15 @@ public function define(Container $di): void
                 }
             }
 
-            foreach ($classMap->getAttributeSpecificationsFor($className) as $specification) {
+            $classSpecification = $classMap->getClassSpecificationFor($className);
+            foreach ($classSpecification->getAttributes() as $specification) {
                 $attribute = $specification->getAttributeInstance();
                 if (\array_key_exists($attribute::class, $attributeConfigs)) {
                     $configuredBy = $attributeConfigs[$attribute::class];
                     $configuredBy::define(
                         $di,
                         $specification,
+                        $classSpecification
                     );
                 }
 
@@ -81,6 +83,7 @@ public function define(Container $di): void
                         $configuredBy::define(
                             $di,
                             $specification,
+                            $classSpecification
                         );
                     }
                 }
diff --git a/src/ClassScanner/ClassSpecification.php b/src/ClassScanner/ClassSpecification.php
new file mode 100644
index 0000000..ce5c25e
--- /dev/null
+++ b/src/ClassScanner/ClassSpecification.php
@@ -0,0 +1,84 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Aura\Di\ClassScanner;
+
+final class ClassSpecification
+{
+    private string $className;
+    private string $filename;
+    /**
+     * @param array<int, AttributeSpecification> $attributes
+     */
+    private array $attributes;
+
+    /**
+     * @param array<int, AttributeSpecification> $attributes
+     */
+    public function __construct(
+        string $className,
+        string $filename,
+        array $attributes = [],
+    )
+    {
+        $this->className = $className;
+        $this->filename = $filename;
+        $this->attributes = $attributes;
+    }
+
+    public function getClassName(): string
+    {
+        return $this->className;
+    }
+
+    public function getFilename(): string
+    {
+        return $this->filename;
+    }
+
+    /**
+     * @return array<int, AttributeSpecification>
+     */
+    public function getAttributes(): array
+    {
+        return $this->attributes;
+    }
+
+    public function isAttributeClass(): bool
+    {
+        foreach ($this->attributes as $specification) {
+            if ($specification->getAttributeInstance() instanceof \Attribute) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * @return array<int, AttributeSpecification>
+     */
+    public function getClassAttributes(): array
+    {
+        return \array_filter(
+            $this->attributes,
+            function (AttributeSpecification $specification) {
+                return $specification->getAttributeTarget() === \Attribute::TARGET_CLASS;
+            }
+        );
+    }
+
+    /**
+     * @return array<int, AttributeSpecification>
+     */
+    public function getParameterAttributesForMethod(string $methodName): array
+    {
+        return \array_filter(
+            $this->attributes,
+            function (AttributeSpecification $specification) use ($methodName) {
+                return $specification->getTargetMethod() === $methodName;
+            }
+        );
+    }
+}
\ No newline at end of file
diff --git a/src/ClassScanner/ComposerMapGenerator.php b/src/ClassScanner/ComposerMapGenerator.php
index a74c904..4798900 100644
--- a/src/ClassScanner/ComposerMapGenerator.php
+++ b/src/ClassScanner/ComposerMapGenerator.php
@@ -51,9 +51,11 @@ private function convertToClassMap(ClassMap $classMap, array $composerMap): Clas
             }
 
             $classMap->addClass(
-                $class,
-                $path,
-                [...$this->reflector->yieldAttributes($class)]
+                new ClassSpecification(
+                    $class,
+                    $path,
+                    [...$this->reflector->yieldAttributes($class)]
+                )
             );
         }
 
diff --git a/tests/ClassScanner/CachedFileGeneratorTest.php b/tests/ClassScanner/CachedFileGeneratorTest.php
index 84f3761..e4d39cd 100644
--- a/tests/ClassScanner/CachedFileGeneratorTest.php
+++ b/tests/ClassScanner/CachedFileGeneratorTest.php
@@ -51,7 +51,7 @@ public function testAddingClass()
 
         $classMap2 = $cachedFileModificationGenerator->update($classMap, [$newFile]);
         $this->assertContains($newClassName, $classMap2->getClasses());
-        $this->assertCount(1, $classMap2->getAttributeSpecificationsFor($newClassName));
+        $this->assertCount(1, $classMap2->getClassSpecificationFor($newClassName)->getAttributes());
     }
 
     public function testRemovingClass()
diff --git a/tests/Fake/FakeWorkerAttribute.php b/tests/Fake/FakeWorkerAttribute.php
index 1379573..386fbb3 100644
--- a/tests/Fake/FakeWorkerAttribute.php
+++ b/tests/Fake/FakeWorkerAttribute.php
@@ -5,6 +5,7 @@
 use Aura\Di\Attribute\BlueprintNamespace;
 use Aura\Di\ClassScanner\AttributeConfigInterface;
 use Aura\Di\ClassScanner\AttributeSpecification;
+use Aura\Di\ClassScanner\ClassSpecification;
 use Aura\Di\Container;
 
 #[\Attribute]
@@ -19,15 +20,19 @@ public function __construct(int $someSetting = 1)
         $this->someSetting = $someSetting;
     }
 
-    public static function define(Container $di, AttributeSpecification $specification): void
+    public static function define(
+        Container $di,
+        AttributeSpecification $attributeSpecification,
+        ClassSpecification $classSpecification
+    ): void
     {
         /** @var self $attribute */
-        $attribute = $specification->getAttributeInstance();
-        if ($specification->getAttributeTarget() === \Attribute::TARGET_CLASS) {
+        $attribute = $attributeSpecification->getAttributeInstance();
+        if ($attributeSpecification->getAttributeTarget() === \Attribute::TARGET_CLASS) {
             $di->values['worker'] = $di->values['worker'] ?? [];
             $di->values['worker'][] = [
                 'someSetting' => $attribute->someSetting,
-                'className' => $specification->getClassName(),
+                'className' => $attributeSpecification->getClassName(),
             ];
         }
     }