[英]Mapping Lists of objects with Dozer
I created a dozer mapping for ClassA to ClassB. 我为ClassA创建了一个推土机映射到ClassB。
Now I want to map a List<ClassA>
to a List<ClassB>
. 现在我想将List<ClassA>
映射到List<ClassB>
。
Is it possible to just 是否有可能
mapper.map(variableListClassA, variableListClassB)
or do I have to go over a loop, eg 或者我必须经过一个循环,例如
for (ClassA classA : variableListClassA) {
variableListClassB.add(mapper.map(classA, ClassB.class))
}
You need to use the loop, because the type of the list is erased at runtime. 您需要使用循环,因为列表的类型在运行时被擦除。
If both lists are a field of a class, you can map the owning classes. 如果两个列表都是类的字段,则可以映射拥有的类。
you could also use A helper class to do that in one step 您也可以使用辅助类一步完成
public class DozerHelper {
public static <T, U> ArrayList<U> map(final Mapper mapper, final List<T> source, final Class<U> destType) {
final ArrayList<U> dest = new ArrayList<U>();
for (T element : source) {
if (element == null) {
continue;
}
dest.add(mapper.map(element, destType));
}
// finally remove all null values if any
List s1 = new ArrayList();
s1.add(null);
dest.removeAll(s1);
return dest;
}
}
and your call above would be like 而你上面的电话会是这样的
List<ClassB> listB = DozerHelper.map(mapper, variableListClassA, ClassB.class);
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