[英]Validate a list of strings against a list of Enums
我有一個.properties
文件,其中包含一組屬性作為鍵值對。 這被讀入配置Enum類。 此配置類包含與屬性對應的枚舉。 我希望能夠發現兩者之間的差異。 因此,如果屬性文件包含在類中不存在的屬性,或者相反。
換句話說,我有一個枚舉數組:
MyEnumClass[] enums = {E1,E2,E3}
和代表枚舉的字符串數組
String[] properties = {"E1","E2","E3"}
如何找到兩者的交集? 優選地,我想避免流。
這是一種計算交點的簡單方法(更改輸入以使結果顯而易見):
List<String> properties = Arrays.asList(new String[] { "E1", "E2" });
List<MyEnumClass> enums = Arrays.asList(new MyEnumClass[]
{ MyEnumClass.E2, MyEnumClass.E3 });
List<String> enumNames = new ArrayList<>();
for (MyEnumClass e : enums)
enumNames.add(e.name());
List<String> intersection = new ArrayList<>(enumNames);
intersection.retainAll(properties);
System.out.println(intersection); //[E2]
這可以計算彼此之間的差異:
List<String> propDiff = new ArrayList<>(properties);
propDiff.removeAll(enumNames);
System.out.println(propDiff); //[E1]
List<String> enumDiff = new ArrayList<>(enumNames);
enumDiff.removeAll(properties);
System.out.println(enumDiff); //[E3]
您可以這樣使用EnumSet<MyEnumClass>
:
Set<MyEnumClass> all = EnumSet.allOf(MyEnumClass.class);
然后從您的屬性中創建另一個EnumSet<MyEnumClass>
:
Set<MyEnumClass> loaded = EnumSet.noneOf(MyEnumClass.class);
for(String property : properties) {
loaded.add(MyEnumClass.valueOf(property));
}
然后,您可以使用Collection.removeAll
, Collection.addAll
, Collection.retainAll
檢查其他內容:
// all will now contain every element from loaded
all.addAll(loaded);
// all will now contain every element which was not contained in loaded
all.removeAll(loaded);
// all will now contain every element which was contained in loaded
all.retainAll(loaded);
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