javassist.scopedpool

Class SoftValueHashMap

java.lang.Object

java.util.AbstractMap

javassist.scopedpool.SoftValueHashMap

All Implemented Interfaces:

java.util.Map

public class SoftValueHashMap
extends java.util.AbstractMap
implements java.util.Map

This Map will remove entries when the value in the map has been cleaned from garbage collection

Version:

$Revision: 1.4 $

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	SoftValueHashMap.SoftValueRef

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

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

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

java.util.Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.Map	hash
private java.lang.ref.ReferenceQueue	queue

Constructor Summary

Constructors

Constructor and Description
SoftValueHashMap() Constructs a new, empty WeakHashMap with the default initial capacity and the default load factor, which is 0.75.
SoftValueHashMap(int initialCapacity) Constructs a new, empty WeakHashMap with the given initial capacity and the default load factor, which is 0.75.
SoftValueHashMap(int initialCapacity, float loadFactor) Constructs a new, empty WeakHashMap with the given initial capacity and the given load factor.
SoftValueHashMap(java.util.Map t) Constructs a new WeakHashMap with the same mappings as the specified Map.

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all mappings from this map.
boolean	containsKey(java.lang.Object key) Returns true if this map contains a mapping for the specified key.
java.util.Set	entrySet() Returns a set of the mappings contained in this hash table.
java.lang.Object	get(java.lang.Object key) Returns the value to which this map maps the specified key.
boolean	isEmpty() Returns true if this map contains no key-value mappings.
private void	processQueue()
java.lang.Object	put(java.lang.Object key, java.lang.Object value) Updates this map so that the given key maps to the given value.
java.lang.Object	remove(java.lang.Object key) Removes the mapping for the given key from this map, if present.
int	size() Returns the number of key-value mappings in this map.

Methods inherited from class java.util.AbstractMap

clone, containsValue, equals, hashCode, keySet, putAll, toString, values

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, containsValue, equals, forEach, getOrDefault, hashCode, keySet, merge, putAll, putIfAbsent, remove, replace, replace, replaceAll, values

Field Detail

hash

private java.util.Map hash

queue

private java.lang.ref.ReferenceQueue queue

Constructor Detail

SoftValueHashMap

public SoftValueHashMap(int initialCapacity,
                        float loadFactor)

Constructs a new, empty WeakHashMap with the given initial capacity and the given load factor.

Parameters:

initialCapacity - The initial capacity of the WeakHashMap

loadFactor - The load factor of the WeakHashMap

Throws:

java.lang.IllegalArgumentException - If the initial capacity is less than zero, or if the load factor is nonpositive

SoftValueHashMap

public SoftValueHashMap(int initialCapacity)

Constructs a new, empty WeakHashMap with the given initial capacity and the default load factor, which is 0.75.

Parameters:

initialCapacity - The initial capacity of the WeakHashMap

Throws:

java.lang.IllegalArgumentException - If the initial capacity is less than zero

SoftValueHashMap

public SoftValueHashMap()

Constructs a new, empty WeakHashMap with the default initial capacity and the default load factor, which is 0.75.

SoftValueHashMap

public SoftValueHashMap(java.util.Map t)

Constructs a new WeakHashMap with the same mappings as the specified Map. The WeakHashMap is created with an initial capacity of twice the number of mappings in the specified map or 11 (whichever is greater), and a default load factor, which is 0.75.

Parameters:

t - the map whose mappings are to be placed in this map.

Method Detail

entrySet

public java.util.Set entrySet()

Returns a set of the mappings contained in this hash table.

Specified by:

entrySet in interface java.util.Map

Specified by:

entrySet in class java.util.AbstractMap

processQueue

private void processQueue()

size

public int size()

Returns the number of key-value mappings in this map. Note: In contrast with most implementations of the Map interface, the time required by this operation is linear in the size of the map.

Specified by:

size in interface java.util.Map

Overrides:

size in class java.util.AbstractMap

isEmpty

public boolean isEmpty()

Returns true if this map contains no key-value mappings.

Specified by:

isEmpty in interface java.util.Map

Overrides:

isEmpty in class java.util.AbstractMap

containsKey

public boolean containsKey(java.lang.Object key)

Returns true if this map contains a mapping for the specified key.

Specified by:

containsKey in interface java.util.Map

Overrides:

containsKey in class java.util.AbstractMap

Parameters:

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

get

public java.lang.Object get(java.lang.Object key)

Returns the value to which this map maps the specified key. If this map does not contain a value for this key, then return null.

Specified by:

get in interface java.util.Map

Overrides:

get in class java.util.AbstractMap

Parameters:

key - The key whose associated value, if any, is to be returned.

put

public java.lang.Object put(java.lang.Object key,
                            java.lang.Object value)

Updates this map so that the given key maps to the given value. If the map previously contained a mapping for key then that mapping is replaced and the previous value is returned.

Specified by:

put in interface java.util.Map

Overrides:

put in class java.util.AbstractMap

Parameters:

key - The key that is to be mapped to the given value

value - The value to which the given key is to be mapped

Returns:

The previous value to which this key was mapped, or null if if there was no mapping for the key

remove

public java.lang.Object remove(java.lang.Object key)

Removes the mapping for the given key from this map, if present.

Specified by:

remove in interface java.util.Map

Overrides:

remove in class java.util.AbstractMap

Parameters:

key - The key whose mapping is to be removed.

Returns:

The value to which this key was mapped, or null if there was no mapping for the key.

clear

public void clear()

Removes all mappings from this map.

Specified by:

clear in interface java.util.Map

Overrides:

clear in class java.util.AbstractMap