解释代码 List<LabelValueVo> labelList = labelValueVoList.stream(). collect(Collectors.collectingAndThen( Collectors.toCollection(() -> new TreeSet<>(Comparator .comparing(LabelValueVo::getLabelId))), ArrayList::new));

这段代码使用了Java 8的Stream API来对一个List进行操作。首先，它将labelValueVoList转换为一个Stream对象。然后，它使用collect方法来收集Stream中的元素。

collect方法中的参数是一个Collectors对象，它使用了collectingAndThen方法。collectingAndThen方法的作用是将一个收集器（第一个参数）的结果转换为另一种类型（第二个参数）。

在这个例子中，我们使用了两个收集器。第一个收集器是toCollection方法，它将Stream中的元素收集到一个TreeSet中。TreeSet是一个有序集合，它会根据元素的比较顺序对它们进行排序。Comparator.comparing方法指定了排序的规则，即按照LabelValueVo对象的labelId属性进行排序。

第二个收集器是ArrayList::new，它将TreeSet转换为一个ArrayList。最终的结果是一个按照labelId排序的ArrayList对象。

总的来说，这段代码的作用是将一个List按照LabelValueVo对象的labelId属性排序，并将结果存储在一个ArrayList中。

相关问题

优化代码 List<ActionExecutingParam> validActionList = actionExecutingParam.stream().filter(o -> check(o.getProgressStatus(), o.getAppMap())).collect(Collectors.toList()); List<ActionExecutingParam> unvalidActionList = actionExecutingParam.stream().filter(o -> !check(o.getProgressStatus(), o.getAppMap())).collect(Collectors.toList());

你的代码实现了将一个 List<ActionExecutingParam> 按照条件筛选成两个 List<ActionExecutingParam> 的功能，其中一个 List 存放符合条件的元素，另一个 List 存放不符合条件的元素。

不过代码中有一些可以优化的地方：

1. 可以将 `check(o.getProgressStatus(), o.getAppMap())` 的结果缓存起来，避免重复计算。

2. 可以使用 `partitioningBy` 方法来将 List 分成两个 Map，其中一个 Map 中存放符合条件的元素，另一个 Map 中存放不符合条件的元素。

下面是优化后的代码实现：

Map<Boolean, List<ActionExecutingParam>> partitionedMap = actionExecutingParam.stream()
        .collect(Collectors.partitioningBy(o -> check(o.getProgressStatus(), o.getAppMap())));

List<ActionExecutingParam> validActionList = partitionedMap.get(true);
List<ActionExecutingParam> unvalidActionList = partitionedMap.get(false);

这样可以避免重复计算，并且更加简洁和易于理解。

List<DataPermissionSchemaEo> dataPermissionSchemaEoList = comDataComponent.getDataPermissionSchemaList(); List<SchemaRowRuleEo> schemaRowRuleList = comDataComponent.getSchemaRowRuleList(); List<SchemaColumnRuleEo> schemaColumnRuleList = comDataComponent.getSchemaColumnRuleList(); //设置行权限 根据用户id和用户组织去获取 List<SchemaRowRule> userRowRuleList = schemaRowRuleList.stream() .filter(schemaRowRuleEo -> { List<String> userList = JSONObject.parseArray(schemaRowRuleEo.getRowPermissionUserList(), String.class); List<String> orgList = JSONObject.parseArray(schemaRowRuleEo.getRowPermissionOrgList(), String.class); return userList.contains(userUid) || orgList.contains(orgCode) || userList.contains(WILDCARD) || orgList.contains(WILDCARD); }) .map(schemaRowRuleEo -> { SchemaRowRule schemaRowRule = new SchemaRowRule(); BeanUtils.copyProperties(schemaRowRuleEo, schemaRowRule); return schemaRowRule; }) .collect(Collectors.toList());List<SchemaColumnRule> userColumnRuleList = schemaColumnRuleList.stream() .filter(rule -> { List<String> userList = Optional.ofNullable(rule.getColumnPermissionUserList()) .map(userListStr -> JSONObject.parseArray(userListStr, String.class)) .orElse(Collections.emptyList()); List<String> orgList = Optional.ofNullable(rule.getColumnPermissionOrgList()) .map(orgListStr -> JSONObject.parseArray(orgListStr, String.class)) .orElse(Collections.emptyList()); return userList.contains(userUid) || orgList.contains(orgCode) || userList.contains(WILDCARD) || orgList.contains(WILDCARD); }) .map(rule -> { SchemaColumnRule columnRule = new SchemaColumnRule(); BeanUtils.copyProperties(rule, columnRule); return columnRule; }) .collect(Collectors.toList()); List<DataPermissionSchema> dataPermissionSchemaList = dataPermissionSchemaEoList.stream().map(dataPermissionSchemaEo -> { List<SchemaRowRule> schemaRowRules = userRowRuleList.stream() .filter(schemaRule -> dataPermissionSchemaEo.getDatabaseCode().equals(schemaRule.getDatabaseCode()) && dataPermissionSchemaEo.getSchemaCode().equals(schemaRule.getSchemaCode())) .collect(Collectors.toList()); List<SchemaColumnRule> schemaColumnRules = userColumnRuleList.stream() .filter(schemaRule -> dataPermissionSchemaEo.getDatabaseCode().equals(schemaRule.getDatabaseCode()) && dataPermissionSchemaEo.getSchemaCode().equals(schemaRule.getSchemaCode())) .collect(Collectors.toList()); if(!schemaRowRules.isEmpty() || !schemaColumnRules.isEmpty()) { DataPermissionSchema dataPermissionSchema = new DataPermissionSchema(); dataPermissionSchema.setDatabaseCode(dataPermissionSchemaEo.getDatabaseCode()); dataPermissionSchema.setSchemaCode(dataPermissionSchemaEo.getSchemaCode()); dataPermissionSchema.setSchemaRowRuleList(schemaRowRules); dataPermissionSchema.setSchemaColumnRuleList(schemaColumnRules); return dataPermissionSchema; } return null; }).filter(Objects::nonNull).collect(Collectors.toList());把这段代码改造成每个用户拥有的行权限和列权限

可以将该代码封装成一个方法，接收用户ID和组织代码作为参数，返回该用户拥有的行权限和列权限，代码如下：

public List<DataPermissionSchema> getUserDataPermissionSchema(String userUid, String orgCode) {
    List<DataPermissionSchemaEo> dataPermissionSchemaEoList = comDataComponent.getDataPermissionSchemaList();
    List<SchemaRowRuleEo> schemaRowRuleList = comDataComponent.getSchemaRowRuleList();
    List<SchemaColumnRuleEo> schemaColumnRuleList = comDataComponent.getSchemaColumnRuleList();

    // 获取用户行权限
    List<SchemaRowRule> userRowRuleList = schemaRowRuleList.stream()
            .filter(schemaRowRuleEo -> {
                List<String> userList = JSONObject.parseArray(schemaRowRuleEo.getRowPermissionUserList(), String.class);
                List<String> orgList = JSONObject.parseArray(schemaRowRuleEo.getRowPermissionOrgList(), String.class);
                return userList.contains(userUid) || orgList.contains(orgCode) || userList.contains(WILDCARD) || orgList.contains(WILDCARD);
            })
            .map(schemaRowRuleEo -> {
                SchemaRowRule schemaRowRule = new SchemaRowRule();
                BeanUtils.copyProperties(schemaRowRuleEo, schemaRowRule);
                return schemaRowRule;
            })
            .collect(Collectors.toList());

    // 获取用户列权限
    List<SchemaColumnRule> userColumnRuleList = schemaColumnRuleList.stream()
            .filter(rule -> {
                List<String> userList = Optional.ofNullable(rule.getColumnPermissionUserList())
                        .map(userListStr -> JSONObject.parseArray(userListStr, String.class))
                        .orElse(Collections.emptyList());
                List<String> orgList = Optional.ofNullable(rule.getColumnPermissionOrgList())
                        .map(orgListStr -> JSONObject.parseArray(orgListStr, String.class))
                        .orElse(Collections.emptyList());
                return userList.contains(userUid) || orgList.contains(orgCode) || userList.contains(WILDCARD) || orgList.contains(WILDCARD);
            })
            .map(rule -> {
                SchemaColumnRule columnRule = new SchemaColumnRule();
                BeanUtils.copyProperties(rule, columnRule);
                return columnRule;
            })
            .collect(Collectors.toList());

    // 获取用户权限所在的数据权限模板
    List<DataPermissionSchema> dataPermissionSchemaList = dataPermissionSchemaEoList.stream().map(dataPermissionSchemaEo -> {
        List<SchemaRowRule> schemaRowRules = userRowRuleList.stream()
                .filter(schemaRule -> dataPermissionSchemaEo.getDatabaseCode().equals(schemaRule.getDatabaseCode())
                        && dataPermissionSchemaEo.getSchemaCode().equals(schemaRule.getSchemaCode()))
                .collect(Collectors.toList());
        List<SchemaColumnRule> schemaColumnRules = userColumnRuleList.stream()
                .filter(schemaRule -> dataPermissionSchemaEo.getDatabaseCode().equals(schemaRule.getDatabaseCode())
                        && dataPermissionSchemaEo.getSchemaCode().equals(schemaRule.getSchemaCode()))
                .collect(Collectors.toList());
        if(!schemaRowRules.isEmpty() || !schemaColumnRules.isEmpty()) {
            DataPermissionSchema dataPermissionSchema = new DataPermissionSchema();
            dataPermissionSchema.setDatabaseCode(dataPermissionSchemaEo.getDatabaseCode());
            dataPermissionSchema.setSchemaCode(dataPermissionSchemaEo.getSchemaCode());
            dataPermissionSchema.setSchemaRowRuleList(schemaRowRules);
            dataPermissionSchema.setSchemaColumnRuleList(schemaColumnRules);
            return dataPermissionSchema;
        }
        return null;
    }).filter(Objects::nonNull).collect(Collectors.toList());

    return dataPermissionSchemaList;
}