如何解决在编译时检查传递给方法的字符串参数是否具有@deprecated注释
|| 我想验证是否不赞成使用传递给方法的字符串。例如。：public class MyRepo
@Deprecated
private static final String OLD_PATH = \"old_path\";
private static final String NEW_PATH = \"new_path\";
//...
public load(Node node){
migrateProperty(node,OLD_PATH,NEW_PATH );
//load the properties
loadProperty(node,NEW_PATH);
}
//I want to validate that the String oldPath has the @Deprecated annotation
public void migrateProperty(Node node,String oldPath,String newPath) {
if(node.hasProperty(oldPath)){
Property property = node.getProperty(oldPath);
node.setProperty(newPath,(Value) property);
property.remove();
}
}
//I want to validate that the String path does not have the @Deprecated annotation
public void loadProperty(Node node,String path) {
//load the property from the node
}
}
解决方法
您的注释将字段“ 1”标记为已弃用，而不是字符串“ 2”。在对“ 3”的调用中，您传递字符串，而不是字段。因此，该方法不知道该值来自的字段，因此无法检查它的注释。
通过注释，您可以声明有关Java元素的信息，例如类，字段，变量，方法。您不能注释对象，例如字符串。
您链接到的文章讨论了注释形式参数。同样，被注释的是参数，而不是参数（传递的值）。如果将@Something放入方法参数，则此参数将始终与该方法的调用者传递的值无关地进行注释。
您可以执行以下操作-但是我不确定这是否是您想要的-
@Deprecated
private static final String OLD_PATH = \"old_path\";
private static final String NEW_PATH = \"new_path\";
public load(Node node){
migrateProperty(node,getClass().getDeclaredField(\"OLD_PATH\"),getClass().getDeclaredField(\"NEW_PATH\") );
// ...
}
//I want to validate that the String oldPath has the @Deprecated annotation
public void migrateProperty(Node node,Field<String> oldPath,Field<String> newPath) {
if ( oldPath.getAnnotation(Deprecated.class) == null ) {
// ... invalid
}
// ...
}
@Deprecated
private static final String OLD_PATH = \"old_path\";
private static final String NEW_PATH = \"new_path\";
@deprecated
migrateProperty()
new MyRepo().loadProperty(\"old_path\");
public class MyRepo {
@Deprecated
private static final String OLD_PATH = \"old_path\";
private static final String NEW_PATH = \"new_path\";
private boolean isDeprecated(String path) {
return OLD_PATH.equals(\"old_path\");
}
//...
public load(Node node){
migrateProperty(node,OLD_PATH,NEW_PATH );
//load the properties
loadProperty(node,NEW_PATH);
}
//I want to validate that the String oldPath has the @Deprecated annotation
public void migrateProperty(Node node,String oldPath,String newPath) {
if (!isDeprecated(oldPath)) {
throw new Exception(oldPath + \" is not deprecated\");
}
if(node.hasProperty(oldPath)){
Property property = node.getProperty(oldPath);
node.setProperty(newPath,(Value) property);
property.remove();
}
}
//I want to validate that the String path does not have the @Deprecated annotation
public void loadProperty(Node node,String path) {
if (isDeprecated(path)) {
throw new Exception(path + \" is deprecated,please use \" + NEW_PATH);
}
//load the property from the node
}
}
enum
public class MyRepo
private enum Preferred {
PATH(\"new_path\"),OTHER_THING(\"bar\");
private String value;
Preferred(String value) {
this.value = value;
}
@Override
public String toString() {
return value;
}
}
private enum Legacy {
PATH(\"old_path\"),OTHER_THING(\"foo\");
private String value;
Legacy(String value) {
this.value = value;
}
@Override
public String toString() {
return value;
}
}
public load(Node node){
migrateProperty(node,Legacy.PATH,Preferred.PATH);
//load the properties
loadProperty(node,Preferred.PATH);
}
public void migrateProperty(Node node,Legacy oldBusted,Preferred newHotness) {
if (node.hasProperty(oldBusted)) {
Property property = node.getProperty(oldBusted);
node.setProperty(newHotness,(Value) property);
property.remove();
}
}
public void loadProperty(Node node,Preferred path) {
//load the property from the node
}
}
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