Implement hashCode() and equals() behind a generator option.

The option is only called 'generate_equals' because:
- equals() is the main thing; hashCode() is there only to
  complement equals();
- it's shorter;
- toString() should not be included in this option because
  it's more for debugging and it's more likely to stop
  ProGuard from working well.

Also shortened the "has bit" expression; was
((bitField & mask) == mask), now ((bitField & mask) != 0).
Both the Java code and the bytecode are slightly shorter.

Change-Id: Ic309a08a60883bf454eb6612679aa99611620e76

1 files changed, 2 insertions, 0 deletions

diff --git a/src/google/protobuf/compiler/javanano/javanano_generator.cc b/src/google/protobuf/compiler/javanano/javanano_generator.cc
index 48c3a21..5c8bcb6 100644
--- a/src/google/protobuf/compiler/javanano/javanano_generator.cc
+++ b/src/google/protobuf/compiler/javanano/javanano_generator.cc
@@ -125,6 +125,8 @@ bool JavaNanoGenerator::Generate(const FileDescriptor* file,
     } else if (options[i].first == "optional_field_style") {
       params.set_optional_field_accessors(options[i].second == "accessors");
       params.set_use_reference_types_for_primitives(options[i].second == "reftypes");
+    } else if (options[i].first == "generate_equals") {
+      params.set_generate_equals(options[i].second == "true");
     } else {
       *error = "Ignore unknown javanano generator option: " + options[i].first;
     }