auto import from //depot/cupcake/@137055

src/com/google/common/io/protocol/ProtoBuf.java

@@ -144,6 +144,28 @@ public class ProtoBuf {
     insertProtoBuf(tag, getCount(tag), value);
   }
 
+  /**
+   * Adds a new protobuf for the specified tag, setting the child protobuf's
+   * type correctly for the tag.
+   * @param tag the tag for which to create a new protobuf
+   * @return the newly created protobuf
+   */
+  public ProtoBuf addNewProtoBuf(int tag) {
+    ProtoBuf child = newProtoBufForTag(tag);
+    addProtoBuf(tag, child);
+    return child;
+  }
+
+  /**
+   * Creates and returns a new protobuf for the specified tag, setting the new
+   * protobuf's type correctly for the tag.
+   * @param tag the tag for which to create a new protobuf
+   * @return the newly created protobuf
+   */
+  public ProtoBuf newProtoBufForTag(int tag) {
+      return new ProtoBuf((ProtoBufType) msgType.getData(tag));
+  }
+
   /**
    * Appends the given (repeated) tag with the given String value.
    */
@@ -729,6 +751,18 @@ public class ProtoBuf {
     setObject(tag, pb);
   }
 
+  /**
+   * Sets a new protobuf for the specified tag, setting the child protobuf's
+   * type correctly for the tag.
+   * @param tag the tag for which to create a new protobuf
+   * @return the newly created protobuf
+   */
+  public ProtoBuf setNewProtoBuf(int tag) {
+    ProtoBuf child = newProtoBufForTag(tag);
+    setProtoBuf(tag, child);
+    return child;
+  }
+
   /** 
    * Sets the given tag to the given String value. 
    */