Examples of org.apache.commons.collections.map.ReferenceMap

Package org.apache.commons.collections.map

Examples of org.apache.commons.collections.map.ReferenceMap

org.apache.commons.collections.map.ReferenceMap
sun.com/j2se/1.4/docs/api/java/util/WeakHashMap.html"> WeakHashMap. However, you can also specify hard keys and weak values, or any other combination. The default constructor uses hard keys and soft values, providing a memory-sensitive cache.
This map is similar to {@link org.apache.commons.collections.map.ReferenceIdentityMap ReferenceIdentityMap}. It differs in that keys and values in this class are compared using equals().
This {@link Map} implementation does not allow null elements.Attempting to add a null key or value to the map will raise a NullPointerException.
This implementation is not synchronized. You can use {@link java.util.Collections#synchronizedMap} to provide synchronized access to a ReferenceMap. Remember that synchronization will not stop the garbage collecter removing entries.
All the available iterators can be reset back to the start by casting to ResettableIterator and calling reset().
NOTE: As from Commons Collections 3.1 this map extends AbstractReferenceMap (previously it extended AbstractMap). As a result, the implementation is now extensible and provides a MapIterator. @see java.lang.ref.Reference @since Commons Collections 3.0 (previously in main package v2.1) @version $Revision: 1.13 $ $Date: 2004/04/27 21:35:23 $ @author Paul Jack @author Stephen Colebourne

        return this.entityCacheCreator.get(entityType);
    }


    private class EntityCacheCreator extends MapCachingDoubleCheckedCreator<String, IEntityCache> {
        public EntityCacheCreator() {
            super(new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT));
        }

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            if (_oldSerializedViews == null && context != null)
            {
                String cacheMode = getCacheOldViewsInSessionMode(context); 
                if (CACHE_OLD_VIEWS_IN_SESSION_MODE_WEAK.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.WEAK, AbstractReferenceMap.WEAK, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT_WEAK.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.WEAK, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.SOFT, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_HARD_SOFT.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.HARD, AbstractReferenceMap.SOFT);
                }
            }
            
            return _oldSerializedViews;
        }

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            if (_oldSerializedViews == null && context != null)
            {
                String cacheMode = getCacheOldViewsInSessionMode(context); 
                if (CACHE_OLD_VIEWS_IN_SESSION_MODE_WEAK.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.WEAK, AbstractReferenceMap.WEAK, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT_WEAK.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.WEAK, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.SOFT, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_HARD_SOFT.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.HARD, AbstractReferenceMap.SOFT);
                }
            }
            
            return _oldSerializedViews;
        }

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            if (_oldSerializedViews == null && context != null)
            {
                String cacheMode = getCacheOldViewsInSessionMode(context); 
                if (CACHE_OLD_VIEWS_IN_SESSION_MODE_WEAK.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.WEAK, AbstractReferenceMap.WEAK, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT_WEAK.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.WEAK, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.SOFT, true);
                }
                else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_HARD_SOFT.equals(cacheMode))
                {
                    _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.HARD, AbstractReferenceMap.SOFT);
                }
            }
            
            return _oldSerializedViews;
        }

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   */
  private synchronized void init() {
    if (this.objectCache == null)
      this.objectCache =
        Collections.synchronizedMap(
          new ReferenceMap(ReferenceMap.SOFT, ReferenceMap.SOFT));
  }

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            // if multiple file tags are used.
            this.documents.put(files[i], new DocumentHelper(reload, cache, this.src));
        }


        // init caches
        this.expressionCache = Collections.synchronizedMap(new ReferenceMap(ReferenceMap.SOFT, ReferenceMap.SOFT));
        this.expressionValuesCache =
            Collections.synchronizedMap(new ReferenceMap(ReferenceMap.SOFT, ReferenceMap.SOFT));
    }

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        this.ntReg = ntReg;
        this.ntReg.addListener(this);
        this.valueFactory = valueFactory;


        // setup caches with soft references to node type
        ntCache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT);
        pdCache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT);
        ndCache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT);
    }

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        this.ntReg.addListener(this);
        this.store = store;


        // setup caches with soft references to node type
        // & item definition instances
        ntCache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT);
        pdCache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT);
        ndCache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT);


        rootNodeDef =
            new NodeDefinitionImpl(ntReg.getRootNodeDef(), this, session);
        ndCache.put(rootNodeDef.unwrap().getId(), rootNodeDef);
    }

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        this.session = session;
        this.rootNodeDef = rootNodeDef;
        this.rootNodeId = rootNodeId;


        // setup item cache with weak references to items
        itemCache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.WEAK);


        // setup shareable nodes cache
        shareableNodesCache = new ShareableNodesCache();
    }

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        /**
         * Create a new instance of this class.
         */
        public ShareableNodesCache() {
            cache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.HARD);
        }

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