com.sptci.prevayler
Class IndexStorage.FieldStorage

java.lang.Object
  com.sptci.prevayler.IndexStorage.FieldStorage

All Implemented Interfaces:

Serializable

Enclosing class:

IndexStorage

private class IndexStorage.FieldStorage
extends Object
implements Serializable

The storage used to maintain the indices for a field or combination of fields.

Field Summary

private Map<Object,Collection<IndexedObject>>	fieldMap The map used to maintain the indexed values and the prevalent objects that match the indexed values.
private static long	serialVersionUID

Constructor Summary

private

IndexStorage.FieldStorage()

Method Summary

private void	add(Object index, PrevalentObject object) Add the specified index and corresponding prevalent object to the store.
private Collection<IndexedObject>	get(Object index) Return the objects stored in fieldMap for the specified index key.
private boolean	isIndexed(Object values) Determine whether the specified value is indexed in the store.
private void	remove(Object key, PrevalentObject object)
private void	remove(PrevalentObject object) Remove the specified prevalent object from the store.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

fieldMap

private final Map<Object,Collection<IndexedObject>> fieldMap

The map used to maintain the indexed values and the prevalent objects that match the indexed values. The key for the map are the indexed field(s) value(s) and the value is a collection that contains the prevalent object instances that match the index. If the index is unique the collection will have only one instance in it.

Note: The indexed values are not stored directly since that will drastically increate memory requirements for the system. The values stored are instances of IndexedObject from which the indexed object instance may be retrieved.

Constructor Detail

IndexStorage.FieldStorage

private IndexStorage.FieldStorage()

Method Detail

add

private void add(Object index,
                 PrevalentObject object)

Add the specified index and corresponding prevalent object to the store.

Parameters:

index - The index that is being added.

object - The prevalent object associated with the index.

remove

private void remove(Object key,
                    PrevalentObject object)

remove

private void remove(PrevalentObject object)

Remove the specified prevalent object from the store.

Parameters:

object - The prevalent object to remove from the store.

get

private Collection<IndexedObject> get(Object index)

Return the objects stored in fieldMap for the specified index key.

Parameters:

index - The index whose matching values are to be returned.

Returns:

The collection of indexed objects matching the specified index.

isIndexed

private boolean isIndexed(Object values)

Determine whether the specified value is indexed in the store.

Parameters:

values - The object(s) that are indexed.

Returns:

boolean Returns true if indexed.