MessageBodyConverter.java 文件源码

@Override
public Object aroundReadFrom(ReaderInterceptorContext context) throws IOException, WebApplicationException {
  if (!isVersioningSupported(context)) {
    return context.proceed();
  }
  String sourceVersion = Version.get(context);
  Type targetType = context.getGenericType();
  Type sourceType = getVersionType(targetType, sourceVersion);
  context.setType(toClass(sourceType));
  context.setGenericType(sourceType);
  Object sourceObject = context.proceed();
  Object target;
  if (sourceObject instanceof Collection) {
    target = convertCollectionToHigherVersion(targetType, (Collection<?>)sourceObject, sourceVersion);
  } else {
    target = converter.convertToHigherVersion(toClass(targetType), sourceObject, sourceVersion);
  }
  context.setType(toClass(targetType));
  context.setGenericType(targetType);
  return target;
}