K- the type of the keys in this map
V- the type of the values in this map
public class PredicatedMap<K,V> extends AbstractMapDecorator<K,V> implements java.io.Serializable
Mapto validate that additions match a specified predicate.
This map exists to provide validation for the decorated map. It is normally created to decorate an empty map. If an object cannot be added to the map, an IllegalArgumentException is thrown.
One usage would be to ensure that no null keys are added to the map.
Map map = PredicatedSet.decorate(new HashMap(), NotNullPredicate.INSTANCE, null);
Note that PredicatedMap is not synchronized and is not thread-safe.
If you wish to use this map from multiple threads concurrently, you must use
appropriate synchronization. The simplest approach is to wrap this map
Collections.synchronizedMap(Map). This class may throw
exceptions when accessed by concurrent threads without synchronization.
This class is Serializable from Commons Collections 3.1.
|Modifier and Type||Method and Description|
Factory method to create a predicated (validating) map.
Note that the return type is Object, rather than V as in the Map interface.
clear, containsKey, containsValue, equals, get, hashCode, isEmpty, keySet, remove, size, toString, values
public static <K,V> PredicatedMap<K,V> predicatedMap(java.util.Map<K,V> map, Predicate<? super K> keyPredicate, Predicate<? super V> valuePredicate)
If there are any elements already in the list being decorated, they are validated.
K- the key type
V- the value type
map- the map to decorate, must not be null
keyPredicate- the predicate to validate the keys, null means no check
valuePredicate- the predicate to validate to values, null means no check
java.lang.NullPointerException- if the map is null
key- key with which the specified value is to be associated
value- value to be associated with the specified key
nullif there was no mapping for
nullreturn can also indicate that the map previously associated
key, if the implementation supports
public java.util.Set<java.util.Map.Entry<K,V>> entrySet()
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