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com.opencms.flex.util
Class CmsLruHashMap
java.lang.Objectjava.util.AbstractMap
- All Implemented Interfaces:
- java.lang.Cloneable, java.util.Map, java.io.Serializable
- public class CmsLruHashMap
- extends java.util.HashMap
A hash table based implementation of the Map interface with limited size and a "last-recently-used" cache policy of the mapped key/values.
- Version:
- $Revision: 1.8 $
| Nested Class Summary | |
(package private) class |
CmsLruHashMap.CmsLruCacheObject
An object saved under the LRU policy in a CmsLruHashMap. |
| Nested classes inherited from class java.util.HashMap |
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| Nested classes inherited from class java.util.AbstractMap |
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| Nested classes inherited from class java.util.Map |
java.util.Map.Entry |
| Field Summary | |
private CmsFlexLruCache |
m_LruCache
LRU cache to organize the cached objects efficient. |
| Fields inherited from class java.util.HashMap |
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| Fields inherited from class java.util.AbstractMap |
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| Constructor Summary | |
CmsLruHashMap()
Creates a LRU hash map with an initial capacity of (16), a load factor of (0.75), and a max. |
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CmsLruHashMap(int initialCapacity)
Creates a LRU hash map with a given initial capacity, a load factor of (0.75), and a max. |
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CmsLruHashMap(int initialCapacity,
float loadFactor)
Creates a LRU hash map with a given initial capacity, a given load factor, and a max. |
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CmsLruHashMap(int initialCapacity,
float loadFactor,
int maxLruSize)
Creates a LRU hash map with a given initial capacity, a given load factor, and a given max. |
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CmsLruHashMap(int initialCapacity,
int maxLruSize)
Creates a LRU hash map with a given initial capacity, a load factor of (0.75), and a given max. |
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| Method Summary | |
void |
clear()
Removes all objects from this map. |
protected void |
finalize()
Clears any allocated resources during finalization. |
java.lang.Object |
get(java.lang.Object key)
Returns the value to which the specified key is mapped in this identity hash map, or null if the map contains no mapping for this key. |
CmsFlexLruCache |
getLruCache()
Returns the internal cache used for the LRU policy. |
java.lang.Object |
put(java.lang.Object key,
java.lang.Object value)
Associates the specified value with the specified key in this map. |
void |
putAll(java.util.Map t)
Copies all of the mappings from the specified map to this map. |
java.lang.Object |
remove(java.lang.Object key)
Removes the mapping for this key from this map if present. |
| Methods inherited from class java.util.HashMap |
clone, containsKey, containsValue, entrySet, isEmpty, keySet, size, values |
| Methods inherited from class java.util.AbstractMap |
equals, hashCode, toString |
| Methods inherited from class java.lang.Object |
getClass, notify, notifyAll, wait, wait, wait |
| Methods inherited from interface java.util.Map |
equals, hashCode |
| Field Detail |
m_LruCache
private CmsFlexLruCache m_LruCache
- LRU cache to organize the cached objects efficient.
| Constructor Detail |
CmsLruHashMap
public CmsLruHashMap()
- Creates a LRU hash map with an initial capacity of (16), a load factor
of (0.75), and a max. size of cacheable objects of (36).
CmsLruHashMap
public CmsLruHashMap(int initialCapacity)
- Creates a LRU hash map with a given initial capacity, a load factor
of (0.75), and a max. size of cacheable objects of (initialCapacity*3*0.75).
CmsLruHashMap
public CmsLruHashMap(int initialCapacity,
float loadFactor)
- Creates a LRU hash map with a given initial capacity, a given load factor,
and a max. size of cacheable objects of (initialCapacity*3*loadFactor).
CmsLruHashMap
public CmsLruHashMap(int initialCapacity,
int maxLruSize)
- Creates a LRU hash map with a given initial capacity, a load factor of (0.75),
and a given max. size of cacheable objects.
CmsLruHashMap
public CmsLruHashMap(int initialCapacity,
float loadFactor,
int maxLruSize)
- Creates a LRU hash map with a given initial capacity, a given load factor,
and a given max. size of cacheable objects.
| Method Detail |
clear
public void clear()
- Removes all objects from this map.
finalize
protected void finalize()
throws java.lang.Throwable
- Clears any allocated resources during finalization.
get
public java.lang.Object get(java.lang.Object key)
- Returns the value to which the specified key is mapped in this identity
hash map, or null if the map contains no mapping for this key.
A return value of null does not necessarily indicate that the map contains no mapping for the key; it is also possible that the map explicitly maps the key to null. The containsKey method may be used to distinguish these two cases.
put
public java.lang.Object put(java.lang.Object key, java.lang.Object value)
- Associates the specified value with the specified key in this map.
If the map previously contained a mapping for this key, the old value is replaced.
putAll
public void putAll(java.util.Map t)
- Copies all of the mappings from the specified map to this map.
These mappings will replace any mappings that this map had for any of the keys currently in the specified map.
remove
public java.lang.Object remove(java.lang.Object key)
- Removes the mapping for this key from this map if present.
getLruCache
public CmsFlexLruCache getLruCache()
- Returns the internal cache used for the LRU policy.
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