Inline unknownFieldData{Equals,HashCode} to generated code.

It turns out dex (apparently) was inlining these protected final
methods from ExtendableMessageNano into every message class. Removing
these methods from the base class and inlining their code reduces
the method count by 2 methods / message when the store_unknown_fields
option is on.

Change-Id: I0aa09f2016d39939c4c8b8219601793b8fab301f

javanano/src/main/java/com/google/protobuf/nano/ExtendableMessageNano.java

@@ -160,31 +160,6 @@ public abstract class ExtendableMessageNano<M extends ExtendableMessageNano<M>>
         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());
-    }
-
     @Override
     public M clone() throws CloneNotSupportedException {
         M cloned = (M) super.clone();

javanano/src/main/java/com/google/protobuf/nano/FieldArray.java

@@ -35,9 +35,12 @@ package com.google.protobuf.nano;
  * A custom version of {@link android.util.SparseArray} with the minimal API
  * for storing {@link FieldData} objects.
  *
+ * <p>This class is an internal implementation detail of nano and should not
+ * be called directly by clients.
+ *
  * Based on {@link android.support.v4.util.SpareArrayCompat}.
  */
-class FieldArray implements Cloneable {
+public final class FieldArray implements Cloneable {
     private static final FieldData DELETED = new FieldData();
     private boolean mGarbage = false;
 
@@ -48,7 +51,7 @@ class FieldArray implements Cloneable {
     /**
      * Creates a new FieldArray containing no fields.
      */
-    public FieldArray() {
+    FieldArray() {
         this(10);
     }
 
@@ -57,7 +60,7 @@ class FieldArray implements Cloneable {
      * require any additional memory allocation to store the specified
      * number of mappings.
      */
-    public FieldArray(int initialCapacity) {
+    FieldArray(int initialCapacity) {
         initialCapacity = idealIntArraySize(initialCapacity);
         mFieldNumbers = new int[initialCapacity];
         mData = new FieldData[initialCapacity];
@@ -68,7 +71,7 @@ class FieldArray implements Cloneable {
      * Gets the FieldData mapped from the specified fieldNumber, or <code>null</code>
      * if no such mapping has been made.
      */
-    public FieldData get(int fieldNumber) {
+    FieldData get(int fieldNumber) {
         int i = binarySearch(fieldNumber);
 
         if (i < 0 || mData[i] == DELETED) {
@@ -81,7 +84,7 @@ class FieldArray implements Cloneable {
     /**
      * Removes the data from the specified fieldNumber, if there was any.
      */
-    public void remove(int fieldNumber) {
+    void remove(int fieldNumber) {
         int i = binarySearch(fieldNumber);
 
         if (i >= 0 && mData[i] != DELETED) {
@@ -118,7 +121,7 @@ class FieldArray implements Cloneable {
      * Adds a mapping from the specified fieldNumber to the specified data,
      * replacing the previous mapping if there was one.
      */
-    public void put(int fieldNumber, FieldData data) {
+    void put(int fieldNumber, FieldData data) {
         int i = binarySearch(fieldNumber);
 
         if (i >= 0) {
@@ -167,7 +170,7 @@ class FieldArray implements Cloneable {
      * Returns the number of key-value mappings that this FieldArray
      * currently stores.
      */
-    public int size() {
+    int size() {
         if (mGarbage) {
             gc();
         }
@@ -184,7 +187,7 @@ class FieldArray implements Cloneable {
      * the value from the <code>index</code>th key-value mapping that this
      * FieldArray stores.
      */
-    public FieldData dataAt(int index) {
+    FieldData dataAt(int index) {
         if (mGarbage) {
             gc();
         }

src/google/protobuf/compiler/javanano/javanano_message.cc

@@ -612,7 +612,11 @@ void MessageGenerator::GenerateEquals(io::Printer* printer) {
 
   if (params_.store_unknown_fields()) {
     printer->Print(
-      "return unknownFieldDataEquals(other);\n");
+      "if (unknownFieldData == null || unknownFieldData.isEmpty()) {\n"
+      "  return other.unknownFieldData == null || other.unknownFieldData.isEmpty();\n"
+      "} else {\n"
+      "  return unknownFieldData.equals(other.unknownFieldData);\n"
+      "}");
   } else {
     printer->Print(
       "return true;\n");
@@ -642,7 +646,9 @@ void MessageGenerator::GenerateHashCode(io::Printer* printer) {
 
   if (params_.store_unknown_fields()) {
     printer->Print(
-      "result = 31 * result + unknownFieldDataHashCode();\n");
+      "result = 31 * result + \n"
+      "  (unknownFieldData == null || unknownFieldData.isEmpty() ? 0 : \n"
+      "  unknownFieldData.hashCode());\n");
   }
 
   printer->Print("return result;\n");