/**
* Gets the size of the provided area code map storage. The map storage passed-in will be filled
* as a result.
*/
private static int getSizeOfAreaCodeMapStorage(AreaCodeMapStorageStrategy mapStorage,
SortedMap <Integer, String> areaCodeMap)
{
mapStorage.readFromSortedMap(areaCodeMap);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
mapStorage.writeExternal(objectOutputStream);
objectOutputStream.flush();
int sizeOfStorage = byteArrayOutputStream.size();
objectOutputStream.close();
return(sizeOfStorage);
}
/**
* Supports Java Serialization.
*/
public override void readExternal(ObjectInput objectInput)
{
// Read the area code map storage strategy flag.
boolean useFlyweightMapStorage = objectInput.readBoolean();
if (useFlyweightMapStorage)
{
areaCodeMapStorage = new FlyweightMapStorage();
}
else
{
areaCodeMapStorage = new DefaultMapStorage();
}
areaCodeMapStorage.readExternal(objectInput);
}
/**
* Gets the smaller area code map storage strategy according to the provided area code map. It
* actually uses (outputs the data to a stream) both strategies and retains the best one which
* make this method quite expensive.
*/
// @VisibleForTesting
internal AreaCodeMapStorageStrategy getSmallerMapStorage(SortedMap <Integer, String> areaCodeMap)
{
try {
AreaCodeMapStorageStrategy flyweightMapStorage = createFlyweightMapStorage();
int sizeOfFlyweightMapStorage = getSizeOfAreaCodeMapStorage(flyweightMapStorage, areaCodeMap);
AreaCodeMapStorageStrategy defaultMapStorage = createDefaultMapStorage();
int sizeOfDefaultMapStorage = getSizeOfAreaCodeMapStorage(defaultMapStorage, areaCodeMap);
return(sizeOfFlyweightMapStorage < sizeOfDefaultMapStorage
? flyweightMapStorage : defaultMapStorage);
} catch (IOException e) {
LOGGER.severe(e.getMessage());
return(createFlyweightMapStorage());
}
}
/**
* Creates an {@link AreaCodeMap} initialized with {@code sortedAreaCodeMap}. Note that the
* underlying implementation of this method is expensive thus should not be called by
* time-critical applications.
*
* @param sortedAreaCodeMap a map from phone number prefixes to descriptions of corresponding
* geographical areas, sorted in ascending order of the phone number prefixes as integers.
*/
public void readAreaCodeMap(SortedMap <Integer, String> sortedAreaCodeMap)
{
areaCodeMapStorage = getSmallerMapStorage(sortedAreaCodeMap);
}