How to use

hasField

method

in

com.google.protobuf.Message$Builder

 continue;
if (!source.hasField(field) && !destination.hasField(field)) {

if (builder.hasField(field)) {
 throw new InvalidProtocolBufferException(
   "Field " + field.getFullName() + " has already been set.");

if (builder.hasField(field)) {
  throw new InvalidProtocolBufferException(
    "Field " + field.getFullName() + " has already been set.");

if (builder.hasField(field)) {
 throw new InvalidProtocolBufferException(
   "Field " + field.getFullName() + " has already been set.");

if (builder.hasField(field)) {
 throw new InvalidProtocolBufferException(
   "Field " + field.getFullName() + " has already been set.");

  /**
   * Serialize a serviceAttribute and filter a list of fields beforehand.
   *
   * @param serviceAttribute  the service attribute which is serialized
   * @param filteredFieldList a list of field names which shall be filtered before serialization
   * @return a jSon string representation of the service attribute without the filtered fields
   * @throws CouldNotPerformException if the serialization fails or the service attribute does not contain any context
   */
  public String serialize(final Message serviceAttribute, final List<String> filteredFieldList) throws CouldNotPerformException {
    final Message.Builder builder = serviceAttribute.toBuilder();

    for (String filteredField : filteredFieldList) {
      FieldDescriptor fieldDescriptor = ProtoBufFieldProcessor.getFieldDescriptor(builder, filteredField);
      if (!builder.hasField(fieldDescriptor)) {
        continue;
      }

      builder.clearField(fieldDescriptor);
    }

    return super.serialize(builder.build());
  }
}

@Override
public boolean hasField(Descriptors.FieldDescriptor field) {
 return builder.hasField(field);
}

@Override
public boolean hasField(Descriptors.FieldDescriptor field) {
 return builder.hasField(field);
}

@Override
public boolean hasField(Descriptors.FieldDescriptor field) {
 return builder.hasField(field);
}

/** helper method to handle {@code builder} and {@code extensions}. */
private static boolean hasOriginalMessage(
  Message.Builder builder,
  FieldSet<FieldDescriptor> extensions,
  FieldDescriptor field) {
 if (builder != null) {
  return builder.hasField(field);
 } else {
  return extensions.hasField(field);
 }
}