Class LazyHashMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

org.apache.felix.bundlerepository.impl.LazyHashMap<K,V>

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>

public class LazyHashMap<K,V>
extends HashMap<K,V>
implements Map<K,V>

A map that can delay the computation of certain values up until the moment that they are actually needed. Useful for expensive to compute values such as the SHA-256. This map does not support null values.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	LazyHashMap.LazyValue<K,V>

Nested classes/interfaces inherited from class AbstractMap

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

Nested classes/interfaces inherited from interface Map

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor	Description
LazyHashMap(Collection<LazyHashMap.LazyValue<K,V>> lazyValues)	This map behaves like a normal HashMap, expect for the entries passed in as lazy values.

Method Summary

Modifier and Type	Method	Description
V	get(Object key)
V	put(K key, V value)

Methods inherited from class HashMap

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

Methods inherited from class AbstractMap

equals, hashCode, toString

Methods inherited from class Object

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

Methods inherited from interface Map

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

Constructor Details

LazyHashMap

public LazyHashMap(Collection<LazyHashMap.LazyValue<K,V>> lazyValues)

This map behaves like a normal HashMap, expect for the entries passed in as lazy values. A lazy value is a Callable object associated with a key. When the key is looked up and it's one of the lazy values, the value will be computed at that point and stored in the map. If the value is looked up again, it will be served from the map as usual.

Parameters:

lazyValues -

Method Details

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

Overrides:

get in class HashMap<K,V>

put

public V put(K key,
 V value)

Specified by:

put in interface Map<K,V>

Overrides:

put in class HashMap<K,V>