Add a processor_compat.bzl helper macro

RELNOTES=n/a
PiperOrigin-RevId: 746223546

Author: Chang-Eric

hilt-android-testing/main/java/dagger/hilt/android/testing/BUILD

@@ -42,7 +42,7 @@ android_library(
     testonly = 1,
     srcs = ["HiltAndroidTest.java"],
     exported_plugins = [
-        "//hilt-compiler/main/java/dagger/hilt/processor/internal/root:component_tree_deps_plugin",
+        "//hilt-compiler/main/java/dagger/hilt/processor/internal/root:component_tree_deps_processor",
         "//hilt-compiler/main/java/dagger/hilt/processor/internal/root:root_plugin",
         "//hilt-compiler/main/java/dagger/hilt/android/processor/internal/androidentrypoint:plugin",
         "//hilt-compiler/main/java/dagger/hilt/android/processor/internal/viewmodel:validation_plugin",

hilt-android/main/java/dagger/hilt/android/BUILD

@@ -66,7 +66,7 @@ android_library(
     exported_plugins = [
         "//hilt-compiler/main/java/dagger/hilt/android/processor/internal/androidentrypoint:plugin",
         "//hilt-compiler/main/java/dagger/hilt/android/processor/internal/viewmodel:validation_plugin",
-        "//hilt-compiler/main/java/dagger/hilt/processor/internal/root:component_tree_deps_plugin",
+        "//hilt-compiler/main/java/dagger/hilt/processor/internal/root:component_tree_deps_processor",
         "//hilt-compiler/main/java/dagger/hilt/processor/internal/root:root_plugin",
     ],
     exports = [

hilt-compiler/main/java/dagger/hilt/processor/internal/root/BUILD

@@ -16,16 +16,15 @@
 #   Annotation processor for Hilt.
 
 load("@rules_java//java:defs.bzl", "java_library", "java_plugin")
+load("//tools:processor_compat.bzl", "compat_processor_plugin")
 
 package(default_visibility = ["//:src"])
 
-java_plugin(
-    name = "component_tree_deps_plugin",
+compat_processor_plugin(
+    name = "component_tree_deps_processor",
     generates_api = 1,
-    processor_class = "dagger.hilt.processor.internal.root.ComponentTreeDepsProcessor",
-    deps = [
-        ":component_tree_deps_processor_lib",
-    ],
+    processor_base_name = "ComponentTreeDeps",
+    processor_lib_dep = ":component_tree_deps_processor_lib",
 )
 
 java_library(

tools/bazel_compat.bzl

@@ -1,4 +1,4 @@
-# Copyright (C) 202 The Dagger Authors.
+# Copyright (C) 2025 The Dagger Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

tools/processor_compat.bzl

@@ -0,0 +1,29 @@
+# Copyright (C) 2025 The Dagger Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Description:
+#    Macros for processor plugins.
+
+load("@rules_java//java:defs.bzl", "java_plugin")
+
+def compat_processor_plugin(name, processor_base_name, processor_lib_dep, generates_api = False):
+    pkgs = native.package_name().split("/")
+    pkg = ".".join(pkgs[pkgs.index("java") + 1:])
+
+    java_plugin(
+        name = name,
+        generates_api = generates_api,
+        processor_class = pkg + "." + processor_base_name + "Processor",
+        deps = [processor_lib_dep],
+    )