Add back the deprecated ApplicationComponent since hilt-work latest release still uses it.

RELNOTES=Add back the deprecated ApplicationComponent.
PiperOrigin-RevId: 352671220

4 files changed, 28 insertions, 4 deletions

diff --git a/java/dagger/hilt/processor/internal/ClassNames.java b/java/dagger/hilt/processor/internal/ClassNames.java
index 234ea7b45..776eb59f4 100644
--- a/java/dagger/hilt/processor/internal/ClassNames.java
+++ b/java/dagger/hilt/processor/internal/ClassNames.java
@@ -167,6 +167,8 @@ public final class ClassNames {
   public static final ClassName ARRAYS = get("java.util", "Arrays");
 
   // Standard components
+  public static final ClassName LEGACY_APPLICATION_COMPONENT =
+      get("dagger.hilt.android.components", "ApplicationComponent");
   public static final ClassName SINGLETON_COMPONENT =
       get("dagger.hilt.components", "SingletonComponent");
   public static final ClassName ACTIVITY_COMPONENT =
diff --git a/java/dagger/hilt/processor/internal/Components.java b/java/dagger/hilt/processor/internal/Components.java
index 661dd8a9b..9ea7e64e7 100644
--- a/java/dagger/hilt/processor/internal/Components.java
+++ b/java/dagger/hilt/processor/internal/Components.java
@@ -93,16 +93,19 @@ public final class Components {
             || Processors.hasAnnotation(element, ClassNames.TEST_INSTALL_IN));
 
     ImmutableSet<TypeElement> components =
-        ImmutableSet.copyOf(
             Processors.hasAnnotation(element, ClassNames.INSTALL_IN)
                 ? Processors.getAnnotationClassValues(
                     elements,
                     Processors.getAnnotationMirror(element, ClassNames.INSTALL_IN),
-                    "value")
+                    "value").stream()
+                        .map(component -> mapComponents(elements, component))
+                        .collect(toImmutableSet())
                 : Processors.getAnnotationClassValues(
                     elements,
                     Processors.getAnnotationMirror(element, ClassNames.TEST_INSTALL_IN),
-                    "components"));
+                    "components").stream()
+                        .map(component -> mapComponents(elements, component))
+                        .collect(toImmutableSet());
 
     ImmutableSet<TypeElement> undefinedComponents =
         components.stream()
@@ -118,5 +121,16 @@ public final class Components {
     return components.stream().map(ClassName::get).collect(toImmutableSet());
   }
 
+  // Temporary hack while ApplicationComponent is renamed to SingletonComponent
+  private static TypeElement mapComponents(Elements elements, TypeElement element) {
+    if (ClassNames.LEGACY_APPLICATION_COMPONENT.equals(ClassName.get(element))) {
+      TypeElement singletonComponent =
+          elements.getTypeElement(ClassNames.SINGLETON_COMPONENT.canonicalName());
+      Preconditions.checkState(singletonComponent != null);
+      return singletonComponent;
+    }
+    return element;
+  }
+
   private Components() {}
 }
diff --git a/java/dagger/hilt/processor/internal/aggregateddeps/ComponentDependencies.java b/java/dagger/hilt/processor/internal/aggregateddeps/ComponentDependencies.java
index 23ed148c0..d943faf72 100644
--- a/java/dagger/hilt/processor/internal/aggregateddeps/ComponentDependencies.java
+++ b/java/dagger/hilt/processor/internal/aggregateddeps/ComponentDependencies.java
@@ -243,7 +243,7 @@ public abstract class ComponentDependencies {
       // processor since new processors should convert to the new SingletonComponent when generating
       // the metadata class.
       if (descriptor.component().equals(ClassNames.SINGLETON_COMPONENT)) {
-        builder.put("dagger.hilt.android.components.ApplicationComponent", descriptor);
+        builder.put(ClassNames.LEGACY_APPLICATION_COMPONENT.toString(), descriptor);
       }
       builder.put(descriptor.component().toString(), descriptor);
     }
diff --git a/java/dagger/hilt/processor/internal/definecomponent/DefineComponentMetadatas.java b/java/dagger/hilt/processor/internal/definecomponent/DefineComponentMetadatas.java
index aa69e40e1..fde80265b 100644
--- a/java/dagger/hilt/processor/internal/definecomponent/DefineComponentMetadatas.java
+++ b/java/dagger/hilt/processor/internal/definecomponent/DefineComponentMetadatas.java
@@ -61,6 +61,13 @@ final class DefineComponentMetadatas {
   }
 
   private DefineComponentMetadata get(Element element, LinkedHashSet<Element> childPath) {
+    // This is a temporary hack to map the old ApplicationComponent to the new SingletonComponent
+    if (element.getKind().equals(ElementKind.INTERFACE)
+        && asType(element).getQualifiedName()
+            .contentEquals(ClassNames.LEGACY_APPLICATION_COMPONENT.toString())) {
+      element = asTypeElement(asType(element).getInterfaces().get(0));
+    }
+
     if (!metadatas.containsKey(element)) {
       metadatas.put(element, getUncached(element, childPath));
     }
@@ -152,6 +159,7 @@ final class DefineComponentMetadatas {
 
     ProcessorErrors.checkState(
         ClassName.get(parent).equals(ClassNames.DEFINE_COMPONENT_NO_PARENT)
+            || ClassName.get(parent).equals(ClassNames.LEGACY_APPLICATION_COMPONENT)
             || Processors.hasAnnotation(parent, ClassNames.DEFINE_COMPONENT),
         component,
         "@DefineComponent %s, references a type not annotated with @DefineComponent: %s",