public Builder mergeFrom(com.google.cloud.storagebatchoperations.v1.BucketList other) {
      if (other == com.google.cloud.storagebatchoperations.v1.BucketList.getDefaultInstance())
        return this;
      if (bucketsBuilder_ == null) {
        if (!other.buckets_.isEmpty()) {
          if (buckets_.isEmpty()) {
            buckets_ = other.buckets_;
            bitField0_ = (bitField0_ & ~0x00000001);
          } else {
            ensureBucketsIsMutable();
            buckets_.addAll(other.buckets_);
          }
          onChanged();
        }
      } else {
        if (!other.buckets_.isEmpty()) {
          if (bucketsBuilder_.isEmpty()) {
            bucketsBuilder_.dispose();
            bucketsBuilder_ = null;
            buckets_ = other.buckets_;
            bitField0_ = (bitField0_ & ~0x00000001);
            bucketsBuilder_ =
                com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders
                    ? getBucketsFieldBuilder()
                    : null;
          } else {
            bucketsBuilder_.addAllMessages(other.buckets_);
          }
        }
      }
      this.mergeUnknownFields(other.getUnknownFields());
      onChanged();
      return this;
    }
<pre>
Describes list of buckets and their objects to be transformed.
</pre>

Protobuf type {@code google.cloud.storagebatchoperations.v1.BucketList}
java-storagebatchoperations/proto-google-cloud-storagebatchoperations-v1/src/main/java/com/google/cloud/storagebatchoperations/v1/BucketList.java