Package org.hypergraphdb.util

Interface Summary

Interface	Description
CloneMe	Expose the clone method publicly so that it can be invoked at an interface/abstract class level.
CloseMe
CountMe
HGSortedSet<E>	A variation of the standard SortedSet interface that offers a HGRandomAccessResult of its elements in addition to an Iterator.
Mapping<From,To>	An interface specifying a single argument function.
MemoryWarningSystem.Listener
Ref<T>
RefResolver<Key,Value>	Defines a generic capability to resolve a reference of type Key to an object of type Value.
ValueSetter<T>	A simple interface to be implemented by objects that set values in specific dynamic contexts.
Var<T>

Class Summary

Class	Description
AccessibleObjectCache	Utility class to maintain runtime caches of Field, Method and Constructor for use by HGAtomType implementations.
ActionQueueThread	This a simple queue that runs as a thread and executes passed in action object (i.e.
AggregateFuture<T>	An AggregateFuture encapsulates several Future into a single one.
ArrayBasedIterator<T>	Implements an Iterator over the elements of a built-in Java array.
ArrayBasedSet<E>	An implementation SortedSet based on primitive arrays that grow as needed without ever shrinking.
CallbackFuture<T>	An CallbackFuture offers the possibility to call back a registered listener when it is completed.
CallContextRef<T>
ChainResolver<Key,Value>
CompletedFuture<V>	Represents a Future that's already completed.
CompositeMapping<From,To,Intermediate>
Cons<E>
Constant<T>
DelegateMapResolver<Key,Value>	A map-based resolver that will delegate to another resolved if the element is not in the map.
DummyReadWriteLock	A read-write lock that doesn't lock at all.
FilteredSortedSet<E>
FilterIterator<T>	A filtering iterator wraps a source iterator an filter out some of its elements based on a predicate.
HashCodeUtil	Collected methods which allow easy implementation of hashCode.
HGAtomResolver<T>
HGClassLoaderDelegate
HGDatabaseVersionFile	Represents version information at a particular database instance.
HGExecutorService	A wrapper of an underlying executor service implementation that ensures a transaction context is inherited from the calling thread when a task is submitted.
HGLock	Deprecated This class hasn't been in use since the introduction of MVCC which is now how concurrent access to RAM data structures is handled.
HGLogger
HGUtils	The mandatory bag of static utility method class.
KeyMapResolver<Key,Value>
LinkedIdentityHashMap<K,V>
LLRBTree<E>	Implements a set of elements as a left-leaning red-black tree.
MappedFuture<From,To>
MapResolver<Key,Value>
MemoryWarningSystem	This memory warning system will call all registered listeners when we exceed the percentage of available heap memory specified.
Pair<F,S>	The inexplicably missing class from the java.util package.
PredefinedTypesConfig	Utility to read and hold configuration of predefined HyperGraphDB types.
RefCountedMap<K,V>	A variation on a map where values are managed like resources: a put increments a reference count on an existing key-value entry and a remove actually delete the entry when the reference count goes to zero.
SimpleStack<T>	A simple, non thread-safe stack, missing from java.util.
SimplyLinkedQueue<T>
SoftHashMap<K,V>	This is similar to the standard WeakHashMap, but it uses SoftReferences for the map's values instead of WeakReferences for the maps keys.
StringBAInterconverter
TargetSetIterator	An iterator over the target set of a given link.
TempLink	This class represents a simple, temporary link used during various query and graph traversal activities.
TwoWayMap<X,Y>	A bi-directional map X <-> Y.
VarContext	This is a glorified name/value map implementing the handling of query variables.
WeakIdentityHashMap<K,V>	This is a modified version of @see{WeakHashMap} from JDK 1.5.