将List <strings>参数传递给端点</strings>

时间:2014-05-12 18:36:08

标签: android facebook google-app-engine endpoints

我正在使用Google端点编写一款安卓游戏。

我们想检查facebook用户朋友的用户是否也使用我们的应用程序(每个用户在游戏中获取自己的ID,他的facebook id是实体用户的字符串字段)。

所以我将朋友facebook ids的列表放到List中,并希望使用端点将其传递给服务器并进行类型的查询:select n from User n where n.facebookId IN ("+listOfFriends+") 问题是我无法将List传递给端点。

我制作了容器类:

@Entity
public class StringsListContainer {
    private List<String> listString;

    public List<String> getStringsList() {
        return listString;
    }
    public void setStringsList(List<String> objectsList) {
        this.listString = objectsList;
    }
    public StringsListContainer(List<String> listString) {
        this.listString = listString;
    }
}

在UserEndpoints中,我的Api是:

    @SuppressWarnings({ "unchecked", "unused" })
@ApiMethod(name = "getTopFriendsForUser")
public CollectionResponse<User> getTopFriendsForUser(
        @Nullable @Named("cursor") String cursorString,
        @Nullable @Named("limit") Integer limit,
        StringsListContainer friendsLine) {
    System.out.println( "In getTopFriendsForUser endpoint" );
    EntityManager mgr = null;
    Cursor cursor = null;
    List<User> execute= new ArrayList<User>();

        //next will go in chunks depending on size of StringsList
    for(String s : friendsLine.getStringsList())
    {
        if(listOfFriends.isEmpty()) {
            listOfFriends = "'" + s + "'";
        } else {
            listOfFriends = listOfFriends + ",'" + s + "'";
        }
    }

    System.out.println( listOfFriends.toString());

        try {
            mgr = getEntityManager();
            Query query = mgr.createQuery("select n from User n where n.facebookId IN ("+listOfFriends+")");
            if (cursorString != null && cursorString != "") {
                cursor = Cursor.fromWebSafeString(cursorString);
                query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
            }

            if (limit != null) {
                query.setFirstResult(0);
                query.setMaxResults(limit);
            }
            execute = (List<User>) query.getResultList();
            cursor = JPACursorHelper.getCursor(execute);
            if (cursor != null)
                cursorString = cursor.toWebSafeString();

            for (User obj : execute)
                ;
            System.out.println("Ending");
        } finally {
            mgr.close();
        }


    return CollectionResponse.<User> builder().setItems(execute)
            .setNextPageToken(cursorString).build();
}

我生成客户端库并从客户端调用它,如下所示:

CollectionResponseUser response = endpoint.getTopFriendsForUser(friendsList).execute();

我仍然遇到The method getTopFriendsForUser() in the type Userendpoint is not applicable for the arguments (StringsListContainer)错误

任何人都可以建议如何解决这个问题? 或者也许有更好的方法来检查它?

0 个答案:

没有答案