Jorge,
You could create a different named method for each primitive array
type. Would be a pain to use in a generic fashion.
Play with the following sample code to see why the return type
needs to be Object.
regards,
chas
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import org.junit.Test;
public class GenericCastTest {
@SuppressWarnings("unchecked")
public <T> T[] newEmptyArray(Class<T> cls) {
return (T[]) Array.newInstance(cls, 0);
}
/**
* Can't overload method because type erasure is same
*/
public int[] newEmptyIntArray(Class<int[]> cls, String key) {
return (int[]) Array.newInstance(cls, 0);
}
public static class ConfigPojo {
public int[] intParam;
}
@Test(expected=ClassCastException.class)
public void useObjectReturn() throws IllegalArgumentException,
IllegalAccessException {
// won't compile
// int[] empty = newEmptyArray(Integer.TYPE);
ConfigPojo cp = new ConfigPojo();
fillWithEmptyArrays(cp);
}
private void fillWithEmptyArrays(Object cp) throws
IllegalArgumentException, IllegalAccessException {
for(Field field : cp.getClass().getFields()) {
if(field.getType().isArray()) {
field.set(cp,
newEmptyArray(field.getType().getComponentType()));
}
}
}
}
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