public Builder addBlocks(int index, com.google.cloud.vision.v1p4beta1.Block value) {
      if (blocksBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureBlocksIsMutable();
        blocks_.add(index, value);
        onChanged();
      } else {
        blocksBuilder_.addMessage(index, value);
      }
      return this;
    }
<pre>
List of blocks of text, images etc on this page.
</pre>

<code>repeated .google.cloud.vision.v1p4beta1.Block blocks = 4;</code>
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/Page.java