com.google.common.collect

Class EnumCountHashMap<K extends Enum<K>>

java.lang.Object

com.google.common.collect.EnumCountHashMap<K>

@GwtCompatible(serializable=true,
               emulated=true)
public class EnumCountHashMap<K extends Enum<K>>
extends Object

EnumCountHashMap is an implementation of AbstractObjectCountMap with enum type keys.

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all of the mappings from this map.
boolean	containsKey(Object key) Returns true if this map contains a mapping for the specified key.
static <K extends Enum<K>> EnumCountHashMap<K>	create(Class<K> type) Creates an empty EnumCountHashMap instance.
int	get(Object key) Returns the value to which the specified key is mapped, or 0 if this map contains no mapping for the key.
int	hashCode()
int	put(K key, int value) Associates the specified value with the specified key in this map.
int	remove(Object key) Removes the mapping for a key from this map if it is present.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Method Detail

create

public static <K extends Enum<K>> EnumCountHashMap<K> create(Class<K> type)

Creates an empty EnumCountHashMap instance.

clear

public void clear()

Removes all of the mappings from this map. The map will be empty after this call returns.

containsKey

public boolean containsKey(@Nullable
                           Object key)

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

Parameters:

key - key whose presence in this map is to be tested

Returns:

true if this map contains a mapping for the specified key

get

public int get(@Nullable
               Object key)

Returns the value to which the specified key is mapped, or 0 if this map contains no mapping for the key.

Parameters:

key - the key whose associated value is to be returned

Returns:

the int value to which the specified key is mapped, or 0 if this map contains no mapping for the key

put

public int put(@Nullable
               K key,
               int value)

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

Parameters:

key - key with which the specified value is to be associated

value - a positive int value to be associated with the specified key

Returns:

the previous value associated with key, or 0 if there was no mapping for key.

remove

public int remove(@Nullable
                  Object key)

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

Returns the value to which this map previously associated the key, or 0 if the map contained no mapping for the key.

Parameters:

key - key whose mapping is to be removed from the map

Returns:

the previous int value associated with key, or 0 if there was no mapping for key.

hashCode

public int hashCode()

Overrides:

hashCode in class Object