Package org.apache.tinkerpop.gremlin.tinkergraph.structure

Class AbstractTinkerIndex<T extends Element>

java.lang.Object

org.apache.tinkerpop.gremlin.tinkergraph.structure.AbstractTinkerIndex<T>

Type Parameters:

T - type of Element to be indexed

public abstract class AbstractTinkerIndex<T extends Element>
extends Object

Storage for indexes that can be used by different implementations of AbstractTinkerGraph.

Author:

Valentyn Kahamlyk

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	AbstractTinkerIndex.IndexedNull

Field Summary

Fields

Modifier and Type	Field	Description
protected final AbstractTinkerGraph	graph
protected final Class<T>	indexClass
protected final Set<String>	indexedKeys

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractTinkerIndex(AbstractTinkerGraph graph, Class<T> indexClass)

Method Summary

Modifier and Type	Method	Description
abstract void	autoUpdate(String key, Object newValue, Object oldValue, T element)	Update index for single property of element.
abstract long	count(String key, Object value)	Get count of elements which have a property with the desired value.
abstract void	createKeyIndex(String key)	Create new index
abstract void	dropKeyIndex(String key)	Drop index
abstract List<T>	get(String key, Object value)	Get list of elements which have a property with the desired value.
Set<String>	getIndexedKeys()	Get all index keys for Graph
static Object	indexable(Object obj)	Provides a way for an index to have a null value as ConcurrentHashMap will not allow a null key.
abstract void	remove(String key, Object value, T element)	Remove elements with some property from index.
abstract void	removeElement(T element)	Remove elements from all indexes.

Methods inherited from class java.lang.Object

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

Field Details

indexClass

protected final Class<T extends Element> indexClass

graph

protected final AbstractTinkerGraph graph

indexedKeys

protected final Set<String> indexedKeys

Constructor Details

AbstractTinkerIndex

protected AbstractTinkerIndex(AbstractTinkerGraph graph,
 Class<T> indexClass)

Method Details

get

public abstract List<T> get(String key,
 Object value)

Get list of elements which have a property with the desired value.

Parameters:

key - property key

value - property value

Returns:

list of elements

count

public abstract long count(String key,
 Object value)

Get count of elements which have a property with the desired value.

Parameters:

key - property key

value - property value

Returns:

count of elements

remove

public abstract void remove(String key,
 Object value,
 T element)

Remove elements with some property from index. Convenient to use when removed only one property of an element.

Parameters:

key - property key

value - property value

element - changed element

removeElement

public abstract void removeElement(T element)

Remove elements from all indexes. Can be used when element was deleted or has changed more than 1 property.

Parameters:

element - changed element

autoUpdate

public abstract void autoUpdate(String key,
 Object newValue,
 Object oldValue,
 T element)

Update index for single property of element.

Parameters:

key - property key

newValue - updated value of property

oldValue - optional value of property before update

element - changed element

createKeyIndex

public abstract void createKeyIndex(String key)

Create new index

Parameters:

key - property key

dropKeyIndex

public abstract void dropKeyIndex(String key)

Drop index

Parameters:

key - property key

getIndexedKeys

public Set<String> getIndexedKeys()

Get all index keys for Graph

Returns:

set of index keys

indexable

public static Object indexable(Object obj)

Provides a way for an index to have a null value as ConcurrentHashMap will not allow a null key.