Cache

Removes all mappings from the cache.

Returns true if this cache contains a mapping for the specified key. More formally, returns true if and only if this cache contains a mapping for a key k such that (key==null ? k==null : key.equals(k)). (There can be at most one such mapping.)

Returns the value to which this cache maps the specified key. Returns null if the cache contains no mapping for this key. A return value of null does not necessarily indicate that the cache contains no mapping for the key; it's also possible that the cache explicitly maps the key to null. The containsKey operation may be used to distinguish these two cases.

More formally, if this cache contains a mapping from a key k to a value v such that (key==null ? k==null : key.equals(k)), then this method returns v; otherwise it returns null. (There can be at most one such mapping.)

Returns the cache name.

Returns the the native, underlying cache provider.

Associates the specified value with the specified key in this cache (optional operation). If the cache previously contained a mapping for this key, the old value is replaced by the specified value. (A cache m is said to contain a mapping for a key k if and only if m.containsKey(k) would return true.))

If the specified key is not already associated with a value, associate it with the given value. This is equivalent to:

  if (!cache.containsKey(key)) 
     return cache.put(key, value);
  else
     return cache.get(key);
	

Removes the mapping for this key from this cache if it is present (optional operation). More formally, if this cache contains a mapping from key k to value v such that (key==null ? k==null : key.equals(k)), that mapping is removed. (The cache can contain at most one such mapping.)

Returns the value to which the cache previously associated the key, or null if the cache contained no mapping for this key. (A null return can also indicate that the cache previously associated null with the specified key if the implementation supports null values.) The cache will not contain a mapping for the specified key once the call returns.

Remove entry for key only if currently mapped to given value. Similar to:

   if ((cache.containsKey(key) && cache.get(key).equals(value)) {
      cache.remove(key);
      return true;
   } 
   else 
      return false;
 

Replace entry for key only if currently mapped to given value. Similar to:

 
  if ((cache.containsKey(key) && cache.get(key).equals(oldValue)) {
     cache.put(key, newValue);
     return true;
 } else return false;
 

Replace entry for key only if currently mapped to some value. Acts as

 
  if ((cache.containsKey(key)) {
     return cache.put(key, value);
 } else return null;