import com.google.protos.ipc.invalidation.AndroidService.ClientDowncall; //导入依赖的package包/类
/** Appends a description of the given client {@code downcall} to the given {@code builder}. */
public static TextBuilder toCompactString(TextBuilder builder,
    ClientDowncall downcall) {
  if (downcall == null) {
    return builder;
  }
  builder.append(ProtocolIntents.CLIENT_DOWNCALL_KEY).append("::");
  if (downcall.hasStart()) {
    builder.append("start()");
  } else if (downcall.hasStop()) {
    builder.append("stop()");
  } else if (downcall.hasAck()) {
    toCompactString(builder, downcall.getAck());
  } else if (downcall.hasRegistrations()) {
    toCompactString(builder, downcall.getRegistrations());
  } else {
    builder.append(UNKNOWN_MESSAGE);
  }
  return builder;
}
 

import com.google.protos.ipc.invalidation.AndroidService.ClientDowncall; //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);
  ClientDowncall message = (ClientDowncall) rawMessage;
  if (field == SERIAL) {
    return message.hasSerial();
  }
  if (field == VERSION) {
    return message.hasVersion();
  }
  if (field == START) {
    return message.hasStart();
  }
  if (field == STOP) {
    return message.hasStop();
  }
  if (field == ACK) {
    return message.hasAck();
  }
  if (field == REGISTRATIONS) {
    return message.hasRegistrations();
  }
  throw new IllegalArgumentException("Bad descriptor: " + field);
}
 

import com.google.protos.ipc.invalidation.AndroidService.ClientDowncall; //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);
  ClientDowncall message = (ClientDowncall) rawMessage;
  if (field == SERIAL) {
    return message.getSerial();
  }
  if (field == VERSION) {
    return message.getVersion();
  }
  if (field == START) {
    return message.getStart();
  }
  if (field == STOP) {
    return message.getStop();
  }
  if (field == ACK) {
    return message.getAck();
  }
  if (field == REGISTRATIONS) {
    return message.getRegistrations();
  }
  throw new IllegalArgumentException("Bad descriptor: " + field);
}
 

import com.google.protos.ipc.invalidation.AndroidService.ClientDowncall; //导入依赖的package包/类
private static ClientDowncall.Builder newBuilder() {
  return ClientDowncall.newBuilder().setVersion(ANDROID_PROTOCOL_VERSION_VALUE);
}
 

import com.google.protos.ipc.invalidation.AndroidService.ClientDowncall; //导入依赖的package包/类
/** Returns whether {@code downcall} has a valid set of fields with valid values. */
boolean isDowncallValid(ClientDowncall downcall) {
  return checkMessage(downcall, DowncallMessageInfos.DOWNCALL_MSG);
}
 

import com.google.protos.ipc.invalidation.AndroidService.ClientDowncall; //导入依赖的package包/类
/** Appends a description of any known extra or appends 'UNKNOWN' if none are recognized. */
private static boolean tryParseExtra(TextBuilder builder, Intent intent)
    throws InvalidProtocolBufferException {
  byte[] data;

  data = intent.getByteArrayExtra(ProtocolIntents.SCHEDULER_KEY);
  if (data != null) {
    AndroidSchedulerEvent schedulerEvent = AndroidSchedulerEvent.parseFrom(data);
    toCompactString(builder, schedulerEvent);
    return true;
  }

  data = intent.getByteArrayExtra(ProtocolIntents.OUTBOUND_MESSAGE_KEY);
  if (data != null) {
    AndroidNetworkSendRequest outboundMessage = AndroidNetworkSendRequest.parseFrom(data);
    toCompactString(builder, outboundMessage);
    return true;
  }

  data = intent.getByteArrayExtra(ProtocolIntents.LISTENER_UPCALL_KEY);
  if (data != null) {
    ListenerUpcall upcall = ListenerUpcall.parseFrom(data);
    toCompactString(builder, upcall);
    return true;
  }

  data = intent.getByteArrayExtra(ProtocolIntents.INTERNAL_DOWNCALL_KEY);
  if (data != null) {
    InternalDowncall internalDowncall = InternalDowncall.parseFrom(data);
    toCompactString(builder, internalDowncall);
    return true;
  }

  data = intent.getByteArrayExtra(ProtocolIntents.CLIENT_DOWNCALL_KEY);
  if (data != null) {
    ClientDowncall clientDowncall = ClientDowncall.parseFrom(data);
    toCompactString(builder, clientDowncall);
    return true;
  }

  // Didn't recognize any intents.
  return false;
}