/** {@inheritDoc} */
public V put(K key, V value) {
LazyInitializer<V> c = cache.put(key, new NoopInitializer(value));
if (c != null) {
return c.get();
}
return null;
}
/** {@inheritDoc} */
public V remove(Object key) {
LazyInitializer<V> c = cache.remove(key);
if (c != null) {
return c.get();
}
return null;
}
/**
* If the specified key is not already associated with a value, associate it with the given value.
* This is equivalent to
*
* <pre>
* if (!map.containsKey(key))
* return map.put(key, value);
* else
* return map.get(key);</pre>
*
* except that the action is performed atomically.
*
* @param key key with which the specified value is to be associated
* @param value a lazy initialized value object.
* @return the previous value associated with the specified key, or <tt>null</tt> if there was no
* mapping for the key
* @throws NullPointerException if the specified key or value is null
*/
public V putIfAbsent(K key, LazyInitializer<V> value) {
LazyInitializer<V> v = cache.get(key);
if (v == null) {
v = cache.putIfAbsent(key, value);
if (v == null) {
return value.get();
}
}
return v.get();
}