import com.google.protos.ipc.invalidation.ClientProtocol.ServerHeader; //导入依赖的package包/类
/** Constructs an instance from a {@code rawMessage}. */
ParsedMessage(ServerToClientMessage rawMessage) {
  // For each field, assign it to the corresponding protobuf field if present, else null.
  ServerHeader messageHeader = rawMessage.getHeader();
  header = new ServerMessageHeader(messageHeader.getClientToken(),
      messageHeader.hasRegistrationSummary() ? messageHeader.getRegistrationSummary() : null);
  tokenControlMessage = rawMessage.hasTokenControlMessage() ?
      rawMessage.getTokenControlMessage() : null;
  invalidationMessage = rawMessage.hasInvalidationMessage() ?
      rawMessage.getInvalidationMessage() : null;
  registrationStatusMessage = rawMessage.hasRegistrationStatusMessage() ?
      rawMessage.getRegistrationStatusMessage() : null;
  registrationSyncRequestMessage = rawMessage.hasRegistrationSyncRequestMessage() ?
      rawMessage.getRegistrationSyncRequestMessage() : null;
  configChangeMessage = rawMessage.hasConfigChangeMessage() ?
      rawMessage.getConfigChangeMessage() : null;
  infoRequestMessage = rawMessage.hasInfoRequestMessage() ?
      rawMessage.getInfoRequestMessage() : null;
  errorMessage = rawMessage.hasErrorMessage() ? rawMessage.getErrorMessage() : null;
}
 

import com.google.protos.ipc.invalidation.ClientProtocol.ServerHeader; //导入依赖的package包/类
/** Returns whether {@code field} is present in {@code message}. */
@Override
@SuppressWarnings("unchecked")
public boolean hasField(MessageLite rawMessage, Descriptor field) {
  Preconditions.checkNotNull(rawMessage);
  Preconditions.checkNotNull(field);
  ServerHeader message = (ServerHeader) rawMessage;
  if (field == PROTOCOL_VERSION) {
    return message.hasProtocolVersion();
  }
  if (field == CLIENT_TOKEN) {
    return message.hasClientToken();
  }
  if (field == REGISTRATION_SUMMARY) {
    return message.hasRegistrationSummary();
  }
  if (field == SERVER_TIME_MS) {
    return message.hasServerTimeMs();
  }
  if (field == MESSAGE_ID) {
    return message.hasMessageId();
  }
  throw new IllegalArgumentException("Bad descriptor: " + field);
}
 

import com.google.protos.ipc.invalidation.ClientProtocol.ServerHeader; //导入依赖的package包/类
/** Returns the {@code field} from {@code message}. */
@Override
@SuppressWarnings("unchecked")
public Object getField(MessageLite rawMessage, Descriptor field) {
  Preconditions.checkNotNull(rawMessage);
  Preconditions.checkNotNull(field);
  ServerHeader message = (ServerHeader) rawMessage;
  if (field == PROTOCOL_VERSION) {
    return message.getProtocolVersion();
  }
  if (field == CLIENT_TOKEN) {
    return message.getClientToken();
  }
  if (field == REGISTRATION_SUMMARY) {
    return message.getRegistrationSummary();
  }
  if (field == SERVER_TIME_MS) {
    return message.getServerTimeMs();
  }
  if (field == MESSAGE_ID) {
    return message.getMessageId();
  }
  throw new IllegalArgumentException("Bad descriptor: " + field);
}
 

import com.google.protos.ipc.invalidation.ClientProtocol.ServerHeader; //导入依赖的package包/类
@Override
public boolean postValidate(MessageLite message) {
  ServerHeader header = (ServerHeader) message;
  if (header.getClientToken().isEmpty()) {
    logger.info("Client token was empty: %s", header);
    return false;
  }
  if (header.getServerTimeMs() < 0) {
    logger.info("Server time was negative: %s", header);
    return false;
  }
  // If set, message id must not be empty.
  // Do not use String.isEmpty() here for Froyo (JDK5) compatibility.
  if (header.hasMessageId() && (header.getMessageId().length() == 0)) {
    logger.info("Message id was set but empty: %s", header);
    return false;
  }
  return true;
}
 

import com.google.protos.ipc.invalidation.ClientProtocol.ServerHeader; //导入依赖的package包/类
public static TextBuilder toCompactString(TextBuilder builder, ServerHeader header) {
  if (header == null) {
    return builder;
  }
  builder.append("S2C: ");
  toCompactString(builder, header.getProtocolVersion());
  builder.appendFormat(", MsgId: %s, Num regs = %s, Token = ", header.getMessageId(),
      header.getRegistrationSummary().getNumRegistrations());
  toCompactString(builder, header.getClientToken());
  return builder;
}
 

import com.google.protos.ipc.invalidation.ClientProtocol.ServerHeader; //导入依赖的package包/类
public static ServerHeader newServerHeader(ByteString clientToken, long currentTimeMs,
    RegistrationSummary registrationSummary, String messageId) {
  ServerHeader.Builder builder = ServerHeader.newBuilder()
      .setProtocolVersion(CommonInvalidationConstants2.PROTOCOL_VERSION)
      .setClientToken(clientToken)
      .setServerTimeMs(currentTimeMs);
  if (registrationSummary != null) {
    builder.setRegistrationSummary(registrationSummary);
  }
  if (messageId != null) {
    builder.setMessageId(messageId);
  }
  return builder.build();
}
 

import com.google.protos.ipc.invalidation.ClientProtocol.ServerHeader; //导入依赖的package包/类
public static ServerToClientMessage newServerToClientMessage(ServerHeader scHeader,
    RegistrationSyncRequestMessage syncRequestionMessage) {
  return ServerToClientMessage.newBuilder()
      .setHeader(scHeader)
      .setRegistrationSyncRequestMessage(syncRequestionMessage)
      .build();
}