Stub default methods as needed for core library desugaring

RELNOTES: None

PiperOrigin-RevId: 185082719

1 files changed, 12 insertions, 3 deletions

diff --git a/src/tools/android/java/com/google/devtools/build/android/desugar/CoreLibrarySupport.java b/src/tools/android/java/com/google/devtools/build/android/desugar/CoreLibrarySupport.java
index c6fd0b4817..2437a19979 100644
--- a/src/tools/android/java/com/google/devtools/build/android/desugar/CoreLibrarySupport.java
+++ b/src/tools/android/java/com/google/devtools/build/android/desugar/CoreLibrarySupport.java
@@ -73,6 +73,14 @@ class CoreLibrarySupport {
         : internalName;
   }
 
+  /**
+   * Returns {@code true} for java.* classes or interfaces that are subtypes of emulated interfaces.
+   * Note that implies that this method always returns {@code false} for user-written classes.
+   */
+  public boolean isEmulatedCoreClassOrInterface(String internalName) {
+    return getEmulatedCoreClassOrInterface(internalName) != null;
+  }
+
   public boolean isEmulatedCoreLibraryInvocation(
       int opcode, String owner, String name, String desc, boolean itf) {
     return getEmulatedCoreLibraryInvocationTarget(opcode, owner, name, desc, itf) != null;
@@ -81,9 +89,6 @@ class CoreLibrarySupport {
   @Nullable
   public Class<?> getEmulatedCoreLibraryInvocationTarget(
       int opcode, String owner, String name, String desc, boolean itf) {
-    if (owner.contains("$$Lambda$") || owner.endsWith("$$CC")) {
-      return null;  // regular desugaring handles invocations on generated classes, no emulation
-    }
     Class<?> clazz = getEmulatedCoreClassOrInterface(owner);
     if (clazz == null) {
       return null;
@@ -101,6 +106,10 @@ class CoreLibrarySupport {
   }
 
   private Class<?> getEmulatedCoreClassOrInterface(String internalName) {
+    if (internalName.contains("$$Lambda$") || internalName.endsWith("$$CC")) {
+      // Regular desugaring handles generated classes, no emulation is needed
+      return null;
+    }
     {
       String unprefixedOwner = rewriter.unprefix(internalName);
       if (!unprefixedOwner.startsWith("java/util/") || isRenamedCoreLibrary(unprefixedOwner)) {