java.lang.Object
- java.lang.Enum<MapFeature>
- - com.google.common.collect.testing.features.MapFeature

All Implemented Interfaces:

Feature<Map>, Serializable, Comparable<MapFeature>
```
@GwtCompatible
public enum MapFeature
extends Enum<MapFeature>
implements Feature<Map>
```
Optional features of classes derived from Map.

Author:

George van den Driessche

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static interface MapFeature.Require

Enum Constant Summary

Enum Constants
Enum Constant	Description
`ALLOWS_ANY_NULL_QUERIES`	The map does not throw `NullPointerException` on any `null` queries.
`ALLOWS_NULL_ENTRY_QUERIES`	The map does not throw `NullPointerException` on calls such as `entrySet().contains(null)` or `entrySet().remove(null)`
`ALLOWS_NULL_KEY_QUERIES`	The map does not throw `NullPointerException` on calls such as `containsKey(null)`, `get(null)`, `keySet().contains(null)` or `remove(null)`.
`ALLOWS_NULL_KEYS`
`ALLOWS_NULL_VALUE_QUERIES`	The map does not throw `NullPointerException` on calls such as `containsValue(null)`, `values().contains(null)` or `values().remove(null)`.
`ALLOWS_NULL_VALUES`
`FAILS_FAST_ON_CONCURRENT_MODIFICATION`
`GENERAL_PURPOSE`
`REJECTS_DUPLICATES_AT_CREATION`	Indicates that the constructor or factory method of a map, usually an immutable map, throws an `IllegalArgumentException` when presented with duplicate keys instead of discarding all but one.
`RESTRICTS_KEYS`
`RESTRICTS_VALUES`
`SUPPORTS_PUT`
`SUPPORTS_REMOVE`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Set<Feature<? super Map>>`	`getImpliedFeatures()`	Returns the set of features that are implied by this feature.
`static MapFeature`	`valueOf(String name)`	Returns the enum constant of this type with the specified name.
`static MapFeature[]`	`values()`	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Enum Constant Detail
  - ALLOWS_NULL_KEY_QUERIES
```
public static final MapFeature ALLOWS_NULL_KEY_QUERIES
```
    The map does not throw NullPointerException on calls such as containsKey(null), get(null), keySet().contains(null) or remove(null).
  - ALLOWS_NULL_KEYS
```
public static final MapFeature ALLOWS_NULL_KEYS
```
  - ALLOWS_NULL_VALUE_QUERIES
```
public static final MapFeature ALLOWS_NULL_VALUE_QUERIES
```
    The map does not throw NullPointerException on calls such as containsValue(null), values().contains(null) or values().remove(null).
  - ALLOWS_NULL_VALUES
```
public static final MapFeature ALLOWS_NULL_VALUES
```
  - ALLOWS_NULL_ENTRY_QUERIES
```
public static final MapFeature ALLOWS_NULL_ENTRY_QUERIES
```
    The map does not throw NullPointerException on calls such as entrySet().contains(null) or entrySet().remove(null)
  - ALLOWS_ANY_NULL_QUERIES
```
public static final MapFeature ALLOWS_ANY_NULL_QUERIES
```
    The map does not throw NullPointerException on any null queries.
    
    See Also:
    
    ALLOWS_NULL_KEY_QUERIES, ALLOWS_NULL_VALUE_QUERIES, ALLOWS_NULL_ENTRY_QUERIES
  - RESTRICTS_KEYS
```
public static final MapFeature RESTRICTS_KEYS
```
  - RESTRICTS_VALUES
```
public static final MapFeature RESTRICTS_VALUES
```
  - SUPPORTS_PUT
```
public static final MapFeature SUPPORTS_PUT
```
  - SUPPORTS_REMOVE
```
public static final MapFeature SUPPORTS_REMOVE
```
  - FAILS_FAST_ON_CONCURRENT_MODIFICATION
```
public static final MapFeature FAILS_FAST_ON_CONCURRENT_MODIFICATION
```
  - REJECTS_DUPLICATES_AT_CREATION
```
public static final MapFeature REJECTS_DUPLICATES_AT_CREATION
```
    Indicates that the constructor or factory method of a map, usually an immutable map, throws an IllegalArgumentException when presented with duplicate keys instead of discarding all but one.
  - GENERAL_PURPOSE
```
public static final MapFeature GENERAL_PURPOSE
```
- Method Detail
  - values
```
public static MapFeature[] values()
```
    Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
    for (MapFeature c : MapFeature.values()) System.out.println(c);
    Returns:
    
    an array containing the constants of this enum type, in the order they are declared
  - valueOf
```
public static MapFeature valueOf(String name)
```
    Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
    
    Parameters:
    
    name - the name of the enum constant to be returned.
    
    Returns:
    
    the enum constant with the specified name
    
    Throws:
    
    IllegalArgumentException - if this enum type has no constant with the specified name
    
    NullPointerException - if the argument is null
  - getImpliedFeatures
```
public Set<Feature<? super Map>> getImpliedFeatures()
```
    Description copied from interface: Feature
    
    Returns the set of features that are implied by this feature.
    
    Specified by:
    
    getImpliedFeatures in interface Feature<Map>

Enum MapFeature

Nested Class Summary

Enum Constant Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

ALLOWS_NULL_KEY_QUERIES

ALLOWS_NULL_KEYS

ALLOWS_NULL_VALUE_QUERIES

ALLOWS_NULL_VALUES

ALLOWS_NULL_ENTRY_QUERIES

ALLOWS_ANY_NULL_QUERIES

RESTRICTS_KEYS

RESTRICTS_VALUES

SUPPORTS_PUT

SUPPORTS_REMOVE

FAILS_FAST_ON_CONCURRENT_MODIFICATION

REJECTS_DUPLICATES_AT_CREATION

GENERAL_PURPOSE

Method Detail

values

valueOf

getImpliedFeatures