小编jav*_*arz的帖子

我是eclipse插件开发的新手.

如何获取所有eclipse插件开发库的源代码？没有源代码,很难调试调用或查看实现.

我试图将嵌套的for循环转换为java 8流.

循环实现

private Set<String> getAllowRolesFromInheritedPolicy(String userId, List<Policy> allowedPoliciesThisCustomer) {

    Set<String> allowedRolesThisUser = Sets.newHashSet();

    for (Policy policy : allowedPoliciesThisCustomer) {
        Map<String, Role> roles = policy.getRoles();
        for (Role role : roles.values()) {
            if (role.getUsers().contains(userId)) {
                allowedRolesThisUser.add(role.getRoleName());                   
            }
        }
    }

在代码中role.getUsers()返回List<String>.

流实施

我试图将for循环更改为java 8流:

Set<String> allowedRolesThisUser = Sets.newHashSet(allowedPoliciesThisCustomer.stream()
                                       .map(policy -> policy.getRoles().values())
                                       .filter(role -> role.getUsers().contains(userId))
                                       .collect(Collectors.toList()));

但编译说:

error: cannot find symbol : .filter(role -> role.getUsers().contains(userId))
symbol:   method getUsers(), location: variable role of type Collection<Role>

Role有功能getUsers,Collection<Role> …