Mega Code Archive
Create a typesafe copy of a raw map
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import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* @since 4.37
* @author Jaroslav Tulach
*/
public class Utils {
/**
* Create a typesafe copy of a raw map.
* @param rawMap an unchecked map
* @param keyType the desired supertype of the keys
* @param valueType the desired supertype of the values
* @param strict true to throw a <code>ClassCastException</code> if the raw map has an invalid key or value,
* false to skip over such map entries (warnings may be logged)
* @return a typed map guaranteed to contain only keys and values assignable
* to the named types (or they may be null)
* @throws ClassCastException if some key or value in the raw map was not well-typed, and only if <code>strict</code> was true
*/
public static <K,V> Map<K,V> checkedMapByCopy(Map rawMap, Class<K> keyType, Class<V> valueType, boolean strict) throws ClassCastException {
Map<K,V> m2 = new HashMap<K,V>(rawMap.size() * 4 / 3 + 1);
Iterator it = rawMap.entrySet().iterator();
while (it.hasNext()) {
Map.Entry e = (Map.Entry) it.next();
try {
m2.put(keyType.cast(e.getKey()), valueType.cast(e.getValue()));
} catch (ClassCastException x) {
if (strict) {
throw x;
} else {
System.out.println("not assignable");
}
}
}
return m2;
}
}
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