org.ow2.authzforce.core.pdp.api

Interface UpdatableMap<K,V>

Type Parameters:

K - type of keys in this map

V - type of mapped values

public interface UpdatableMap<K,V>

Updatable Map; "updatable" means elements can only be put to the Map (no removal, no clear)

Method Summary

Modifier and Type	Method and Description
boolean	containsKey(K key) Returns true if this map contains a mapping for the specified key.
com.google.common.collect.ImmutableMap<K,V>	copy() Creates an immutable Map copy with all the elements currently in this Map
V	get(K key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	put(K key, V value) Associates the specified value with the specified key in this map.
void	putAll(Map<? extends K,? extends V> m) Copies all of the mappings from the specified map to this map (optional operation).
V	putIfAbsent(K key, V value) Associates the specified value with the specified key in this map.

Method Detail

put

V put(K key,
      V 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 - value to be associated with the specified key

Returns:

the previous value associated with key, or null if there was no mapping for key. (A null return can also indicate that the map previously associated null with key, if the implementation supports null values.)

putIfAbsent

V putIfAbsent(K key,
              V 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 - value to be associated with the specified key

Returns:

the previous value associated with key, or null if there was no mapping for key. (A null return can also indicate that the map previously associated null with key, if the implementation supports null values.)

putAll

void putAll(Map<? extends K,? extends V> m)

Copies all of the mappings from the specified map to this map (optional operation). The effect of this call is equivalent to that of calling put(k, v) on this map once for each mapping from key k to value v in the specified map. The behavior of this operation is undefined if the specified map is modified while the operation is in progress.

Parameters:

m - mappings to be stored in this map

Throws:

UnsupportedOperationException - if the putAll operation is not supported by this map

ClassCastException - if the class of a key or value in the specified map prevents it from being stored in this map

NullPointerException - if the specified map is null, or if this map does not permit null keys or values, and the specified map contains null keys or values

IllegalArgumentException - if some property of a key or value in the specified map prevents it from being stored in this map

containsKey

boolean containsKey(K 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

Throws:

NullPointerException - if the specified key is null and this map does not permit null keys ( optional)

copy

com.google.common.collect.ImmutableMap<K,V> copy()

Creates an immutable Map copy with all the elements currently in this Map

Returns:

immutable copy of the Map

get

V get(K key)

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

More formally, if this map 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.)

If this map permits null values, then a return value of null does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key to null. The containsKey operation may be used to distinguish these two cases.

Parameters:

key - the key whose associated value is to be returned

Returns:

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

Throws:

NullPointerException - if the specified key is null and this map does not permit null keys ( optional)