## com.google.common.collect
Class MapConstraints

    java.lang.Object
      com.google.common.collect.MapConstraints

    @Beta
    @GwtCompatible
    public final class MapConstraints

extends Object

Factory and utilities pertaining to the `MapConstraint` interface.

Since:
  3.0
Author:
  Mike Bostock
See Also:
  `Constraints`

Method Summary

`static

`<K,V> BiMap<K,V>`

`

`constrainedBiMap(BiMap<K,V> map, MapConstraint<? super K,? super V> constraint)`
Returns a constrained view of the specified bimap, using the specified constraint.

`static

`<K,V> ListMultimap<K,V>`

`

`constrainedListMultimap(ListMultimap<K,V> multimap, MapConstraint<? super K,? super V> constraint)`
Returns a constrained view of the specified list multimap, using the specified constraint.

`static

`<K,V> Map<K,V>`

`

`constrainedMap(Map<K,V> map, MapConstraint<? super K,? super V> constraint)`
Returns a constrained view of the specified map, using the specified constraint.

`static

`<K,V> Multimap<K,V>`

`

`constrainedMultimap(Multimap<K,V> multimap, MapConstraint<? super K,? super V> constraint)`
Returns a constrained view of the specified multimap, using the specified constraint.

`static

`<K,V> SetMultimap<K,V>`

`

`constrainedSetMultimap(SetMultimap<K,V> multimap, MapConstraint<? super K,? super V> constraint)`
Returns a constrained view of the specified set multimap, using the specified constraint.

`static

`<K,V> SortedSetMultimap<K,V>`

`

`constrainedSortedSetMultimap(SortedSetMultimap<K,V> multimap, MapConstraint<? super K,? super V> constraint)`
Returns a constrained view of the specified sorted-set multimap, using the specified constraint.

`static MapConstraint<Object,Object>` `notNull()` Returns a constraint that verifies that neither the key nor the value is null.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### notNull

    public static MapConstraint<Object,Object> notNull()

  Returns a constraint that verifies that neither the key nor the value is null. If either is null, a `NullPointerException` is thrown.

### constrainedMap

    public static <K,V> Map<K,V> constrainedMap(Map<K,V> map,
                                                MapConstraint<? super K,? super V> constraint)

  Returns a constrained view of the specified map, using the specified constraint. Any operations that add new mappings will call the provided constraint. However, this method does not verify that existing mappings satisfy the constraint.

  The returned map is not serializable.

  Parameters:
    `map` - the map to constrain
    `constraint` - the constraint that validates added entries
  Returns:
    a constrained view of the specified map

### constrainedMultimap

    public static <K,V> Multimap<K,V> constrainedMultimap(Multimap<K,V> multimap,
                                                          MapConstraint<? super K,? super V> constraint)

  Returns a constrained view of the specified multimap, using the specified constraint. Any operations that add new mappings will call the provided constraint. However, this method does not verify that existing mappings satisfy the constraint.

  Note that the generated multimap's `Multimap.removeAll(java.lang.Object)` and `Multimap.replaceValues(K, java.lang.Iterable<? extends V>)` methods return collections that are not constrained.

  The returned multimap is not serializable.

  Parameters:
    `multimap` - the multimap to constrain
    `constraint` - the constraint that validates added entries
  Returns:
    a constrained view of the multimap

### constrainedListMultimap

    public static <K,V> ListMultimap<K,V> constrainedListMultimap(ListMultimap<K,V> multimap,
                                                                  MapConstraint<? super K,? super V> constraint)

  Returns a constrained view of the specified list multimap, using the specified constraint. Any operations that add new mappings will call the provided constraint. However, this method does not verify that existing mappings satisfy the constraint.

  Note that the generated multimap's `Multimap.removeAll(java.lang.Object)` and `Multimap.replaceValues(K, java.lang.Iterable<? extends V>)` methods return collections that are not constrained.

  The returned multimap is not serializable.

  Parameters:
    `multimap` - the multimap to constrain
    `constraint` - the constraint that validates added entries
  Returns:
    a constrained view of the specified multimap

### constrainedSetMultimap

    public static <K,V> SetMultimap<K,V> constrainedSetMultimap(SetMultimap<K,V> multimap,
                                                                MapConstraint<? super K,? super V> constraint)

  Returns a constrained view of the specified set multimap, using the specified constraint. Any operations that add new mappings will call the provided constraint. However, this method does not verify that existing mappings satisfy the constraint.

  Note that the generated multimap's `Multimap.removeAll(java.lang.Object)` and `Multimap.replaceValues(K, java.lang.Iterable<? extends V>)` methods return collections that are not constrained.

  The returned multimap is not serializable.

  Parameters:
    `multimap` - the multimap to constrain
    `constraint` - the constraint that validates added entries
  Returns:
    a constrained view of the specified multimap

### constrainedSortedSetMultimap

    public static <K,V> SortedSetMultimap<K,V> constrainedSortedSetMultimap(SortedSetMultimap<K,V> multimap,
                                                                            MapConstraint<? super K,? super V> constraint)

  Returns a constrained view of the specified sorted-set multimap, using the specified constraint. Any operations that add new mappings will call the provided constraint. However, this method does not verify that existing mappings satisfy the constraint.

  Note that the generated multimap's `Multimap.removeAll(java.lang.Object)` and `Multimap.replaceValues(K, java.lang.Iterable<? extends V>)` methods return collections that are not constrained.

  The returned multimap is not serializable.

  Parameters:
    `multimap` - the multimap to constrain
    `constraint` - the constraint that validates added entries
  Returns:
    a constrained view of the specified multimap

### constrainedBiMap

    public static <K,V> BiMap<K,V> constrainedBiMap(BiMap<K,V> map,
                                                    MapConstraint<? super K,? super V> constraint)

  Returns a constrained view of the specified bimap, using the specified constraint. Any operations that modify the bimap will have the associated keys and values verified with the constraint.

  The returned bimap is not serializable.

  Parameters:
    `map` - the bimap to constrain
    `constraint` - the constraint that validates added entries
  Returns:
    a constrained view of the specified bimap

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