private void readConfidence(
     Transaction tx,
     Protos.TransactionConfidence confidenceProto,
     TransactionConfidence confidence)
     throws UnreadableWalletException {
   // We are lenient here because tx confidence is not an essential part of the wallet.
   // If the tx has an unknown type of confidence, ignore.
   if (!confidenceProto.hasType()) {
     log.warn("Unknown confidence type for tx {}", tx.getHashAsString());
     return;
   }
   ConfidenceType confidenceType;
   switch (confidenceProto.getType()) {
     case BUILDING:
       confidenceType = ConfidenceType.BUILDING;
       break;
     case DEAD:
       confidenceType = ConfidenceType.DEAD;
       break;
       // These two are equivalent (must be able to read old wallets).
     case NOT_IN_BEST_CHAIN:
       confidenceType = ConfidenceType.PENDING;
       break;
     case PENDING:
       confidenceType = ConfidenceType.PENDING;
       break;
     case UNKNOWN:
       // Fall through.
     default:
       confidenceType = ConfidenceType.UNKNOWN;
       break;
   }
   confidence.setConfidenceType(confidenceType);
   if (confidenceProto.hasAppearedAtHeight()) {
     if (confidence.getConfidenceType() != ConfidenceType.BUILDING) {
       log.warn("Have appearedAtHeight but not BUILDING for tx {}", tx.getHashAsString());
       return;
     }
     confidence.setAppearedAtChainHeight(confidenceProto.getAppearedAtHeight());
   }
   if (confidenceProto.hasDepth()) {
     if (confidence.getConfidenceType() != ConfidenceType.BUILDING) {
       log.warn("Have depth but not BUILDING for tx {}", tx.getHashAsString());
       return;
     }
     confidence.setDepthInBlocks(confidenceProto.getDepth());
   }
   if (confidenceProto.hasOverridingTransaction()) {
     if (confidence.getConfidenceType() != ConfidenceType.DEAD) {
       log.warn("Have overridingTransaction but not OVERRIDDEN for tx {}", tx.getHashAsString());
       return;
     }
     Transaction overridingTransaction = txMap.get(confidenceProto.getOverridingTransaction());
     if (overridingTransaction == null) {
       log.warn(
           "Have overridingTransaction that is not in wallet for tx {}", tx.getHashAsString());
       return;
     }
     confidence.setOverridingTransaction(overridingTransaction);
   }
   for (Protos.PeerAddress proto : confidenceProto.getBroadcastByList()) {
     InetAddress ip;
     try {
       ip = InetAddress.getByAddress(proto.getIpAddress().toByteArray());
     } catch (UnknownHostException e) {
       throw new UnreadableWalletException("Peer IP address does not have the right length", e);
     }
     int port = proto.getPort();
     PeerAddress address = new PeerAddress(ip, port);
     address.setServices(BigInteger.valueOf(proto.getServices()));
     confidence.markBroadcastBy(address);
   }
   switch (confidenceProto.getSource()) {
     case SOURCE_SELF:
       confidence.setSource(TransactionConfidence.Source.SELF);
       break;
     case SOURCE_NETWORK:
       confidence.setSource(TransactionConfidence.Source.NETWORK);
       break;
     case SOURCE_UNKNOWN:
       // Fall through.
     default:
       confidence.setSource(TransactionConfidence.Source.UNKNOWN);
       break;
   }
 }