import com.google.protos.ipc.invalidation.ClientProtocol.Version; //导入依赖的package包/类
@Override
public boolean postValidate(MessageLite message) {
  // Versions must be non-negative.
  Version version = (Version) message;
  if ((version.getMajorVersion() < 0) || (version.getMinorVersion() < 0)) {
    return false;
  }
  return true;
}
 

import com.google.protos.ipc.invalidation.ClientProtocol.Version; //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);
  Version message = (Version) rawMessage;
  if (field == MAJOR_VERSION) {
    return message.hasMajorVersion();
  }
  if (field == MINOR_VERSION) {
    return message.hasMinorVersion();
  }
  throw new IllegalArgumentException("Bad descriptor: " + field);
}
 

import com.google.protos.ipc.invalidation.ClientProtocol.Version; //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);
  Version message = (Version) rawMessage;
  if (field == MAJOR_VERSION) {
    return message.getMajorVersion();
  }
  if (field == MINOR_VERSION) {
    return message.getMinorVersion();
  }
  throw new IllegalArgumentException("Bad descriptor: " + field);
}
 

import com.google.protos.ipc.invalidation.ClientProtocol.Version; //导入依赖的package包/类
/**
 * Constructs a network endpoint id for an Android client with the given {@code registrationId},
 * {@code clientKey}, and {@code packageName}.
 */
public static NetworkEndpointId newAndroidEndpointId(String registrationId, String clientKey,
    String packageName, Version channelVersion) {
  Preconditions.checkNotNull(registrationId, "Null registration id");
  Preconditions.checkNotNull(clientKey, "Null client key");
  Preconditions.checkNotNull(packageName, "Null package name");
  Preconditions.checkNotNull(channelVersion, "Null channel version");

  AndroidChannel.EndpointId.Builder endpointBuilder = AndroidChannel.EndpointId.newBuilder()
      .setC2DmRegistrationId(registrationId)
      .setClientKey(clientKey)
      .setPackageName(packageName)
      .setChannelVersion(channelVersion);
  return newNetworkEndpointId(NetworkAddress.ANDROID, endpointBuilder.build().toByteString());
}
 

import com.google.protos.ipc.invalidation.ClientProtocol.Version; //导入依赖的package包/类
@Override
public boolean postValidate(MessageLite message) {
  // Versions must be non-negative.
  Version version = (Version) message;
  if ((version.getMajorVersion() < 0) || (version.getMinorVersion() < 0)) {
    logger.info("Invalid versions: %s", version);
    return false;
  }
  return true;
}
 

import com.google.protos.ipc.invalidation.ClientProtocol.Version; //导入依赖的package包/类
public static Version newVersion(int majorVersion, int minorVersion) {
  return Version.newBuilder().setMajorVersion(majorVersion).setMinorVersion(minorVersion).build();
}
 

import com.google.protos.ipc.invalidation.ClientProtocol.Version; //导入依赖的package包/类
/** Returns whether {@code version} is valid. */
public boolean isValid(Version version) {
  return checkMessage(version, commonMsgInfos.VERSION);
}