/**
* Puts all the values from the specified map into this map.
*
* @param map the map to add
* @throws NullPointerException if the map is null
*/
public void putAll(Map map) {
int size = map.size();
if (size == 0) {
return;
}
if (delegateMap != null) {
delegateMap.putAll(map);
return;
}
if (size < 4) {
for (Iterator it = map.entrySet().iterator(); it.hasNext(); ) {
Map.Entry entry = (Map.Entry) it.next();
put(entry.getKey(), entry.getValue());
}
} else {
convertToMap();
delegateMap.putAll(map);
}
}
/**
* Puts a key-value mapping into this map.
*
* @param key the key to add
* @param value the value to add
* @return the value previously mapped to this key, null if none
*/
public Object put(Object key, Object value) {
if (delegateMap != null) {
return delegateMap.put(key, value);
}
// change existing mapping
if (key == null) {
switch (size) { // drop through
case 3:
if (key3 == null) {
Object old = value3;
value3 = value;
return old;
}
case 2:
if (key2 == null) {
Object old = value2;
value2 = value;
return old;
}
case 1:
if (key1 == null) {
Object old = value1;
value1 = value;
return old;
}
}
} else {
if (size > 0) {
int hashCode = key.hashCode();
switch (size) { // drop through
case 3:
if (hash3 == hashCode && key.equals(key3)) {
Object old = value3;
value3 = value;
return old;
}
case 2:
if (hash2 == hashCode && key.equals(key2)) {
Object old = value2;
value2 = value;
return old;
}
case 1:
if (hash1 == hashCode && key.equals(key1)) {
Object old = value1;
value1 = value;
return old;
}
}
}
}
// add new mapping
switch (size) {
default:
convertToMap();
delegateMap.put(key, value);
return null;
case 2:
hash3 = (key == null ? 0 : key.hashCode());
key3 = key;
value3 = value;
break;
case 1:
hash2 = (key == null ? 0 : key.hashCode());
key2 = key;
value2 = value;
break;
case 0:
hash1 = (key == null ? 0 : key.hashCode());
key1 = key;
value1 = value;
break;
}
size++;
return null;
}