Add properties to get only specific types of generated files from the result

Author: tschuchortdev

src/main/kotlin/com/tschuchort/compiletesting/KotlinCompilation.kt

@@ -314,23 +314,41 @@ class KotlinCompilation {
     }
 
 	/** Result of the compilation */
-	class Result(
+	inner class Result(
+		/** The exit code of the compilation */
 		val exitCode: ExitCode,
-		/**
-		 * The class, resource and intermediate source files generated during the compilation.
-		 * Does not include stub files and kapt incremental data.
-		 */
-		val generatedFiles: Collection<File>,
-		/** The directory where only the final output class and resources files will be */
-		val outputDirectory: File,
 		/** Messages that were printed by the compilation */
 		val messages: String
 	) {
 		/** class loader to load the compile classes */
 		val classLoader = URLClassLoader(arrayOf(outputDirectory.toURI().toURL()),
 			this::class.java.classLoader)
-	}
 
+		/** The directory where only the final output class and resources files will be */
+		val outputDirectory: File get() = classesDir
+
+		/**
+		 * 	Intermediate source and resource files generated by the annotation processor that
+		 * 	will be compiled in the next steps.
+		 */
+		val sourcesGeneratedByAnnotationProcessor: List<File>
+				= kaptSourceDir.listFilesRecursively() + kaptKotlinGeneratedDir.listFilesRecursively()
+
+		/**
+		 * Compiled class and resource files that are the final result of the compilation.
+		 */
+		val compiledClassAndResourceFiles: List<File> = outputDirectory.listFilesRecursively()
+
+		/** Stub files generated by kapt */
+		val generatedStubFiles: List<File> = kaptStubsDir.listFilesRecursively()
+
+		/**
+		 * The class, resource and intermediate source files generated during the compilation.
+		 * Does not include stub files and kapt incremental data.
+		 */
+		val generatedFiles: Collection<File>
+				= sourcesGeneratedByAnnotationProcessor + compiledClassAndResourceFiles + generatedStubFiles
+	}
 
 	// setup common arguments for the two kotlinc calls
 	private fun commonK2JVMArgs() = K2JVMCompilerArguments().also { it ->
@@ -730,12 +748,7 @@ class KotlinCompilation {
 		if(exitCode != ExitCode.OK)
 			searchSystemOutForKnownErrors(messages)
 
-		val classAndResFiles = classesDir.listFilesRecursively()
-		val kaptGeneratedKotlinFiles = kaptKotlinGeneratedDir.listFilesRecursively()
-		val kaptGeneratedJavaFiles = kaptSourceDir.listFilesRecursively()
-		val generatedFiles = classAndResFiles + kaptGeneratedJavaFiles + kaptGeneratedKotlinFiles
-
-		return Result(exitCode, generatedFiles, classesDir, messages)
+		return Result(exitCode, messages)
 	}
 
 	private fun commonClasspaths() = mutableListOf<File>().apply {