com.neurosys.domain

Class ImmutableValueHashMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

com.neurosys.domain.ImmutableValueHashMap<K,V>

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>

public class ImmutableValueHashMap<K,V>
extends HashMap<K,V>

Once a value is written it cannot be replaced. Use in situations where once a value is written another process does not change or modify it without design intent.
This class does allow a variant which is preventive in nature that, automatically ensures the value is a List always, so any additions for a Key go into a List. A get on the key will always return a map.

Author:

Arjun Dhar

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
ImmutableValueHashMap(boolean valueAsList)

Method Summary

Modifier and Type	Method and Description
boolean	isValueAsList()
V	put(K key, V value)
V	putOnceOnly(K key, V value)

Methods inherited from class java.util.HashMap

clear, clone, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, forEach, get, getOrDefault, isEmpty, keySet, merge, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Detail

ImmutableValueHashMap

public ImmutableValueHashMap(boolean valueAsList)

Parameters:

valueAsList -

See Also:

valueAsList

Method Detail

put

public V put(K key,
             V value)

Specified by:

put in interface Map<K,V>

Overrides:

put in class HashMap<K,V>

putOnceOnly

public V putOnceOnly(K key,
                     V value)
              throws ReadOnlyException

Throws:

ReadOnlyException

isValueAsList

public boolean isValueAsList()