Create a typesafe copy of a raw set.
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import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
/**
* @since 4.37
* @author Jaroslav Tulach
*/
public class Utils {
/**
* Create a typesafe copy of a raw set.
* @param rawSet an unchecked set
* @param type the desired supertype of the entries
* @param strict true to throw a <code>ClassCastException</code> if the raw set has an invalid entry,
* false to skip over such entries (warnings may be logged)
* @return a typed set guaranteed to contain only entries assignable
* to the named type (or they may be null)
* @throws ClassCastException if some entry in the raw set was not well-typed, and only if <code>strict</code> was true
*/
public static <E> Set<E> checkedSetByCopy(Set rawSet, Class<E> type, boolean strict) throws ClassCastException {
Set<E> s = new HashSet<E>(rawSet.size() * 4 / 3 + 1);
Iterator it = rawSet.iterator();
while (it.hasNext()) {
Object e = it.next();
try {
s.add(type.cast(e));
} catch (ClassCastException x) {
if (strict) {
throw x;
} else {
System.out.println("not assignable ");
}
}
}
return s;
}
}
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