Package org.biojava.nbio.core.util

Class SoftHashMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

org.biojava.nbio.core.util.SoftHashMap<K,V>

Type Parameters:

K - the key type

V - the value type

All Implemented Interfaces:

Map<K,V>

public class SoftHashMap<K,V>
extends AbstractMap<K,V>

An in memory cache using soft references. (can be garbage collected) This code is based on: http://java-interview-faqs.blogspot.com/2008/09/building-faster-and-efficient-cache.html

Note that entrySet() is not implemented and therefore many methods such as keySet(), containsKey(), values() etc do not work.

This class is therefore best used as a cache simply to put and get items by a known key

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>

Field Summary

Fields

Modifier and Type	Field	Description
static final int	DEFAULT_LIMIT

Constructor Summary

Constructors

Constructor	Description
SoftHashMap()
SoftHashMap(int hardSize)

Method Summary

Modifier and Type	Method	Description
void	clear()
Set<Map.Entry<K,V>>	entrySet()
V	get(Object key)
V	put(K key, V value)	Here we put the key, value pair into the HashMap using a SoftValue object.
V	remove(Object key)
int	size()

Methods inherited from class java.util.AbstractMap

clone, containsKey, containsValue, equals, hashCode, isEmpty, 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, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Details

DEFAULT_LIMIT

public static final int DEFAULT_LIMIT

See Also:

• Constant Field Values

Constructor Details

SoftHashMap

public SoftHashMap()

SoftHashMap

public SoftHashMap(int hardSize)

Parameters:

hardSize - A maximum number of items to maintain hard references to that will not be eligible for garbage collection

Method Details

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

Overrides:

get in class AbstractMap<K,V>

put

public V put(K key,
 V value)

Here we put the key, value pair into the HashMap using a SoftValue object.

Specified by:

put in interface Map<K,V>

Overrides:

put in class AbstractMap<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class AbstractMap<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

Overrides:

clear in class AbstractMap<K,V>

size

public int size()

Specified by:

size in interface Map<K,V>

Overrides:

size in class AbstractMap<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

Specified by:

entrySet in class AbstractMap<K,V>