运行时的Java注释
存在以下类,这些类由预定义的UUID组成,这些UUID描述数据库的可能实体运行时的Java注释,java,dynamic,annotations,runtime,Java,Dynamic,Annotations,Runtime,存在以下类,这些类由预定义的UUID组成,这些UUID描述数据库的可能实体 public class Predefined { @NotNull @Size(min = 1, max = 25) public UUID phone = UUID.fromString("47b58767-c0ad-43fe-8e87-c7dae489a4f0"); @NotNull @Size(min = 1, max = 40) public UUID comp
public class Predefined {
@NotNull
@Size(min = 1, max = 25)
public UUID phone = UUID.fromString("47b58767-c0ad-43fe-8e87-c7dae489a4f0");
@NotNull
@Size(min = 1, max = 40)
public UUID company = UUID.fromString("f9a1e8f4-b8c0-41f2-a626-49c11da8d5c2");
}
这些值通过web服务作为密钥对值接收:然后将它们放入hashmap
47b58767-c0ad-43fe-8e87-c7dae489a4f0=+00112233445566778899
f9a1e8f4-b8c0-41f2-a626-49c11da8d5c2=某个虚拟计算机名称
当我收到UUID时,我知道我正在创建预定义类的实例,然后获取预定义类中的字段注释,即:
Annotation[] annon = field.getDeclaredAnnotations();
现在,我需要检查这些注释是否与我在运行时从web服务获得的值一致,即“+00112233445566778899”和“someVirtualCompnayName”
这可能吗?
我对涉及JSR303的示例特别感兴趣
我为什么会有这样的想法:
DAO、@Repository类具有不同的结构,即
接触
联系人(属性)
接触式
其中数据库“contact_attibute_type”表示“公司”和“电话”。第二个表,即“contact_attrbute”是指“company”和“phone”的实际值
现在,我需要一种在hibernate中编写这些值之前验证这些值的方法,因此我将获得“公共UUID电话”,然后尝试将这些约束应用于从用户那里获得的实际值,即“+00112233445566778899”。我将发布我提出的完整代码,以验证您的测试用例(包括一个简单的可执行演示): 注释:
package annotations;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target( {ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface NotNull
{
}
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target( {ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface Size
{
int min() default 0;
int max();
}
预定义类:
public class Predefined
{
@NotNull
@Size(min = 1, max = 25)
public UUID phone;
@NotNull
@Size(min = 1, max = 40)
public UUID company;
public Predefined(UUID phone, UUID company)
{
this.phone = phone;
this.company = company;
}
}
验证程序类,它遍历声明的字段并检查其注释和字段/值映射:
public class PredefinedValidator
{
public boolean validate(Predefined predefined, Map<UUID, String> mappings)
{
if (predefined == null)
return false;
for (Field field :predefined.getClass().getDeclaredFields())
{
if (field.getType().equals(UUID.class))
{
try
{
Annotation[] annotations = field.getDeclaredAnnotations();
UUID uuid = (UUID)field.get(predefined);
if (!this.validateField(uuid, annotations, mappings))
return false;
}
catch (IllegalArgumentException | IllegalAccessException ex)
{
Logger.getLogger(PredefinedValidator.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
return true;
}
private boolean validateField(UUID field, Annotation[] annotations, Map<UUID, String> mapping)
{
boolean containsSize = false;
boolean containsNotNull = false;
int minSize = -1;
int maxSize = -1;
// fetch which annotations are available for the provided field
for (Annotation annotation : annotations)
{
if (annotation instanceof Size)
{
containsSize = true;
Size size = (Size)annotation;
minSize = size.min();
maxSize = size.max();
}
else if (annotation instanceof NotNull)
containsNotNull = true;
}
// check if the provided value is null and an annotatition for @NotNull
// is set
if (field == null && containsNotNull)
return false;
if (containsSize)
{
// get the value of the mapped UUID which we are going to validate
String value = mapping.get(field);
if (value == null && containsNotNull)
return false;
else if (value == null)
return true;
// check if the length of the value matches
if (value.length() <= minSize || value.length() >= maxSize)
return false;
}
// passed all tests
return true;
}
}
公共类预定义验证器
{
公共布尔验证(预定义的映射映射)
{
如果(预定义==null)
返回false;
用于(字段:预定义的.getClass().getDeclaredFields())
{
if(field.getType().equals(UUID.class))
{
尝试
{
Annotation[]annotations=field.getDeclaredAnnotations();
UUID UUID=(UUID)字段.get(预定义);
if(!this.validateField(uuid、注释、映射))
返回false;
}
捕获(IllegalArgumentException | IllegalAccessException ex)
{
Logger.getLogger(预定义的validator.class.getName()).log(Level.SEVERE,null,ex);
}
}
}
返回true;
}
私有布尔validateField(UUID字段、注释[]注释、映射)
{
布尔containsSize=false;
布尔containsNotNull=false;
int minSize=-1;
int maxSize=-1;
//获取可用于所提供字段的批注
用于(注释:注释)
{
if(注释实例的大小)
{
containsSize=true;
大小=(大小)注释;
minSize=size.min();
maxSize=size.max();
}
else if(NotNull的注释实例)
containsNotNull=真;
}
//检查提供的值是否为null,以及@NotNull的注释
//设定
if(字段==null&&containsNotNull)
返回false;
如果(容器化)
{
//获取要验证的映射UUID的值
字符串值=mapping.get(字段);
if(值==null&&containsNotNull)
返回false;
else if(值==null)
返回true;
//检查值的长度是否匹配
if(value.length()=maxSize)
返回false;
}
//通过所有测试
返回true;
}
}
最后但并非最不重要的一个简单演示:
public static void main(String ... args)
{
Map<UUID, String> mappings = new HashMap<>();
mappings.put(UUID.fromString("47b58767-c0ad-43fe-8e87-c7dae489a4f0"), "+00112233445566778899");
mappings.put(UUID.fromString("f9a1e8f4-b8c0-41f2-a626-49c11da8d5c2"), "someVirtualCompnayName");
Predefined predefined = new Predefined(
UUID.fromString("47b58767-c0ad-43fe-8e87-c7dae489a4f0"),
UUID.fromString("f9a1e8f4-b8c0-41f2-a626-49c11da8d5c2"));
Predefined predefined2 = new Predefined(
UUID.randomUUID(),
UUID.fromString("f9a1e8f4-b8c0-41f2-a626-49c11da8d5c2"));
Predefined predefined3 = new Predefined(
null,
UUID.fromString("f9a1e8f4-b8c0-41f2-a626-49c11da8d5c2"));
PredefinedValidator validator = new PredefinedValidator();
System.out.println("predefined is valid: "+validator.validate(predefined, mappings));
System.out.println("predefined is valid: "+validator.validate(predefined2, mappings));
System.out.println("predefined is valid: "+validator.validate(predefined3, mappings));
mappings.put(UUID.fromString("f9a1e8f4-b8c0-41f2-a626-49c11da8d5c2"), "someVirtualCompnayNamesomeVirtualCompnayNamesomeVirtualCompnayNamesomeVirtualCompnayName");
System.out.println("predefined is valid: "+validator.validate(predefined, mappings));
}
publicstaticvoidmain(字符串…参数)
{
Map mappings=newhashmap();
put(UUID.fromString(“47b58767-c0ad-43fe-8e87-c7dae489a4f0”),“+00112233445566778899”);
put(UUID.fromString(“f9a1e8f4-b8c0-41f2-a626-49c11da8d5c2”),“somevirtualcompanyname”);
预定义=新预定义(
UUID.来自字符串(“47b58767-c0ad-43fe-8e87-c7dae489a4f0”),
UUID.fromString(“f9a1e8f4-b8c0-41f2-a626-49c11da8d5c2”);
预定义的预定义2=新的预定义(
UUID.randomUUID(),
UUID.fromString(“f9a1e8f4-b8c0-41f2-a626-49c11da8d5c2”);
预定义的预定义3=新的预定义(
无效的
UUID.fromString(“f9a1e8f4-b8c0-41f2-a626-49c11da8d5c2”);
PredefinedValidator validator=新的PredefinedValidator();
System.out.println(“预定义有效:”+validator.validate(预定义,映射));
System.out.println(“预定义有效:”+validator.validate(预定义的2,映射));
System.out.println(“预定义有效:”+validator.validate(预定义3,映射));
mappings.put(UUID.fromString(“f9a1e8f4-b8c0-41f2-a626-49c11da8d5c2”),“someVirtualComNayNamesomeVirtualComNayNamesomeVirtualComNayNamesomeVirtualComNayNamesomeVirtualComNayNamesomeVirtualComNayName”);
System.out.println(“预定义有效:”+validator.validate(预定义,映射));
}
HTH你好,罗曼,真诚的“danke schön”和“Мèèèèèè”对于这次重播。答案超出了我想要得到的。再次感谢。@Tito无需感谢。因此,保持一个基于投票的系统,如果答案解决了您的问题,接受答案作为解决方案。如果您同意帖子的内容,请对答案进行投票;如果您不同意,请对帖子进行评论,并讨论您的陈述,或者选择如果你认为答案根本不能解决问题,或者缺乏关于如何处理起源问题的适当提示,请投反对票