Fix access around unknownFieldData.

Instead of publishing its class I chose to encapsulate the troublesome
references in equals()/hashCode() in the generated code into superclass
methods in ExtendableMessageNano.

Changed a couple of java packages in the test suite to catch this issue
easier in the future.

Change-Id: I43f88411f63bb6f3ffc8d63361f2f77bebf6220a

4 files changed, 32 insertions, 7 deletions

diff --git a/java/pom.xml b/java/pom.xml
index 0a29f31..d263bec 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -134,7 +134,7 @@
 		<!-- java nano -->
                 <exec executable="../src/protoc">
                   <arg value="--javanano_out=
-                                  java_package = google/protobuf/unittest_import_nano.proto|com.google.protobuf.nano,
+                                  java_package = google/protobuf/unittest_import_nano.proto|com.google.protobuf.nano.testimport,
                                   java_outer_classname = google/protobuf/unittest_import_nano.proto|UnittestImportNano,
                                   generate_equals = true
                                 :target/generated-test-sources" />
diff --git a/java/src/device/test/java/com/google/protobuf/nano/NanoAndroidTest.java b/java/src/device/test/java/com/google/protobuf/nano/NanoAndroidTest.java
index 7092485..4b53607 100644
--- a/java/src/device/test/java/com/google/protobuf/nano/NanoAndroidTest.java
+++ b/java/src/device/test/java/com/google/protobuf/nano/NanoAndroidTest.java
@@ -32,10 +32,10 @@ package com.google.protobuf.nano;
 
 import android.os.Parcel;
 
-import com.google.protobuf.nano.Extensions.ContainerMessage;
-import com.google.protobuf.nano.Extensions.ExtendableMessage;
 import com.google.protobuf.nano.UnittestSimpleNano.SimpleMessageNano;
 import com.google.protobuf.nano.UnittestSimpleNano.SimpleMessageNano.NestedMessage;
+import com.google.protobuf.nano.testext.Extensions.ContainerMessage;
+import com.google.protobuf.nano.testext.Extensions.ExtendableMessage;
 
 import junit.framework.TestCase;
 
diff --git a/java/src/main/java/com/google/protobuf/nano/ExtendableMessageNano.java b/java/src/main/java/com/google/protobuf/nano/ExtendableMessageNano.java
index a0c2731..5984d35 100644
--- a/java/src/main/java/com/google/protobuf/nano/ExtendableMessageNano.java
+++ b/java/src/main/java/com/google/protobuf/nano/ExtendableMessageNano.java
@@ -147,4 +147,29 @@ public abstract class ExtendableMessageNano<M extends ExtendableMessageNano<M>>
         field.addUnknownField(unknownField);
         return true;
     }
+
+    /**
+     * Returns whether the stored unknown field data in this message is equivalent to that in the
+     * other message.
+     *
+     * @param other the other message.
+     * @return whether the two sets of unknown field data are equal.
+     */
+    protected final boolean unknownFieldDataEquals(M other) {
+        if (unknownFieldData == null || unknownFieldData.isEmpty()) {
+            return other.unknownFieldData == null || other.unknownFieldData.isEmpty();
+        } else {
+            return unknownFieldData.equals(other.unknownFieldData);
+        }
+    }
+
+    /**
+     * Computes the hashcode representing the unknown field data stored in this message.
+     *
+     * @return the hashcode for the unknown field data.
+     */
+    protected final int unknownFieldDataHashCode() {
+        return (unknownFieldData == null || unknownFieldData.isEmpty()
+                ? 0 : unknownFieldData.hashCode());
+    }
 }
diff --git a/java/src/test/java/com/google/protobuf/NanoTest.java b/java/src/test/java/com/google/protobuf/NanoTest.java
index 93c9dc4..e831c52 100644
--- a/java/src/test/java/com/google/protobuf/NanoTest.java
+++ b/java/src/test/java/com/google/protobuf/NanoTest.java
@@ -35,9 +35,6 @@ import com.google.protobuf.nano.EnumClassNanoMultiple;
 import com.google.protobuf.nano.EnumClassNanos;
 import com.google.protobuf.nano.EnumValidity;
 import com.google.protobuf.nano.EnumValidityAccessors;
-import com.google.protobuf.nano.Extensions;
-import com.google.protobuf.nano.Extensions.AnotherMessage;
-import com.google.protobuf.nano.Extensions.MessageWithGroup;
 import com.google.protobuf.nano.FileScopeEnumMultiple;
 import com.google.protobuf.nano.FileScopeEnumRefNano;
 import com.google.protobuf.nano.InternalNano;
@@ -57,11 +54,14 @@ import com.google.protobuf.nano.PackedExtensions;
 import com.google.protobuf.nano.RepeatedExtensions;
 import com.google.protobuf.nano.SingularExtensions;
 import com.google.protobuf.nano.TestRepeatedMergeNano;
-import com.google.protobuf.nano.UnittestImportNano;
 import com.google.protobuf.nano.UnittestMultipleNano;
 import com.google.protobuf.nano.UnittestRecursiveNano.RecursiveMessageNano;
 import com.google.protobuf.nano.UnittestSimpleNano.SimpleMessageNano;
 import com.google.protobuf.nano.UnittestSingleNano.SingleMessageNano;
+import com.google.protobuf.nano.testext.Extensions;
+import com.google.protobuf.nano.testext.Extensions.AnotherMessage;
+import com.google.protobuf.nano.testext.Extensions.MessageWithGroup;
+import com.google.protobuf.nano.testimport.UnittestImportNano;
 
 import junit.framework.TestCase;