Package net.ontopia.topicmaps.nav2.utils

Class HistoryMap<T>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<Integer,T>

net.ontopia.topicmaps.nav2.utils.HistoryMap<T>

All Implemented Interfaces:

Serializable, Cloneable, Map<Integer,T>

public class HistoryMap<T>
extends HashMap<Integer,T>

INTERNAL: Helper class for storing elements up to a certain amount, lower most elements will be removed to ensure a fixed size of the collection.

Since:

1.2.5

See Also:

• Serialized Form

Nested Class Summary

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

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

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

Map.Entry<K extends Object,V extends Object>

Field Summary

Fields

Modifier and Type	Field	Description
protected int	maxEntries
protected boolean	suppressDuplicates

Constructor Summary

Constructors

Constructor	Description
HistoryMap()	Default constructor which uses 20 entries as the default history size and does suppress duplicates.
HistoryMap(int maxEntries, boolean suppressDuplicates)	Constructor which allows to specify number of entries to store and duplicate suppression behaviour.

Method Summary

Modifier and Type	Method	Description
void	add(T obj)
boolean	doesSuppressDuplicates()
Collection<T>	getEntries()
Collection	getEntriesReverse()
T	getEntry(int index)
int	getMaxEntries()
void	removeEntry(T obj)

Methods inherited from class java.util.HashMap

clear, clone, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, forEach, get, getOrDefault, isEmpty, keySet, merge, put, 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

Field Details

maxEntries

protected int maxEntries

suppressDuplicates

protected boolean suppressDuplicates

Constructor Details

HistoryMap

public HistoryMap()

Default constructor which uses 20 entries as the default history size and does suppress duplicates.

HistoryMap

public HistoryMap(int maxEntries,
 boolean suppressDuplicates)

Constructor which allows to specify number of entries to store and duplicate suppression behaviour.

Parameters:

maxEntries - Maxium number of entries to store in the history.

suppressDuplicates - Should suppress duplicate entries in map.

Method Details

getMaxEntries

public int getMaxEntries()

doesSuppressDuplicates

public boolean doesSuppressDuplicates()

add

public void add(T obj)

removeEntry

public void removeEntry(T obj)

getEntry

public T getEntry(int index)

getEntries

public Collection<T> getEntries()

getEntriesReverse

public Collection getEntriesReverse()