org.neo4j.kernel

Class StandardExpander

java.lang.Object

org.neo4j.kernel.StandardExpander

All Implemented Interfaces:

Expander, PathExpander, RelationshipExpander

Direct Known Subclasses:

OrderedByTypeExpander

public abstract class StandardExpander
extends Object
implements Expander, PathExpander

Field Summary

Fields

Modifier and Type	Field and Description
static StandardExpander	DEFAULT

Method Summary

Methods

Modifier and Type	Method and Description
StandardExpander	add(RelationshipType type) Add a RelationshipType to the Expander.
abstract StandardExpander	add(RelationshipType type, Direction direction) Add a RelationshipType with a Direction to the Expander.
StandardExpander	addNodeFilter(Predicate<? super Node> filter) Add a Node filter.
StandardExpander	addRelationshipFilter(Predicate<? super Relationship> filter) Add a Relationship filter.
Expander	addRelationsipFilter(Predicate<? super Relationship> filter) Add a Relationship filter.
org.neo4j.kernel.Expansion<Relationship>	expand(Node node) Returns relationships for a Node.
org.neo4j.kernel.Expansion<Relationship>	expand(Path path, BranchState state) Returns relationships for a Path, most commonly from the Path.endNode().
abstract StandardExpander	remove(RelationshipType type) Remove a RelationshipType from the Expander.
abstract StandardExpander	reverse() Returns a new instance with the exact expansion logic, but reversed.
abstract StandardExpander	reversed() Returns a new instance with the exact expansion logic, but reversed.
static PathExpander	toPathExpander(RelationshipExpander expander)
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

DEFAULT

public static final StandardExpander DEFAULT

Method Detail

expand

public final org.neo4j.kernel.Expansion<Relationship> expand(Node node)

Description copied from interface: RelationshipExpander

Returns relationships for a Node.

Specified by:

expand in interface RelationshipExpander

Parameters:

node - the node to expand.

Returns:

the relationships to return for the node.

expand

public final org.neo4j.kernel.Expansion<Relationship> expand(Path path,
                                              BranchState state)

Description copied from interface: PathExpander

Returns relationships for a Path, most commonly from the Path.endNode().

Specified by:

expand in interface PathExpander

Parameters:

path - the path to expand (most commonly the end node).

state - the state of this branch in the current traversal. BranchState.getState() returns the state and BranchState.setState(Object) optionally sets the state for the children of this branch. If state isn't altered the children of this path will see the state of the parent.

Returns:

the relationships to return for the path.

toString

public final String toString()

Overrides:

toString in class Object

add

public final StandardExpander add(RelationshipType type)

Description copied from interface: Expander

Add a RelationshipType to the Expander.

Specified by:

add in interface Expander

Parameters:

type - relationship type

Returns:

new instance

add

public abstract StandardExpander add(RelationshipType type,
                   Direction direction)

Description copied from interface: Expander

Add a RelationshipType with a Direction to the Expander.

Specified by:

add in interface Expander

Parameters:

type - relationship type

direction - expanding direction

Returns:

new instance

remove

public abstract StandardExpander remove(RelationshipType type)

Description copied from interface: Expander

Remove a RelationshipType from the Expander.

Specified by:

remove in interface Expander

Parameters:

type - relationship type

Returns:

new instance

reverse

public abstract StandardExpander reverse()

Description copied from interface: PathExpander

Returns a new instance with the exact expansion logic, but reversed. TODO example

Specified by:

reverse in interface PathExpander

Returns:

a reversed PathExpander.

reversed

public abstract StandardExpander reversed()

Description copied from interface: RelationshipExpander

Returns a new instance with the exact expansion logic, but reversed. For example if this expander is set to expand:

• KNOWS : OUTGOING
• LIVES : INCOMING

Then the reversed expander will be set to expand:

• KNOWS : INCOMING
• LIVES : OUTGOING

Specified by:

reversed in interface Expander

Specified by:

reversed in interface RelationshipExpander

Returns:

a reversed RelationshipExpander.

addNodeFilter

public StandardExpander addNodeFilter(Predicate<? super Node> filter)

Description copied from interface: Expander

Add a Node filter.

Specified by:

addNodeFilter in interface Expander

Parameters:

filter - filter to use

Returns:

new instance

addRelationsipFilter

public final Expander addRelationsipFilter(Predicate<? super Relationship> filter)

Description copied from interface: Expander

Add a Relationship filter.

Specified by:

addRelationsipFilter in interface Expander

Parameters:

filter - filter to use

Returns:

new instance

addRelationshipFilter

public StandardExpander addRelationshipFilter(Predicate<? super Relationship> filter)

Description copied from interface: Expander

Add a Relationship filter.

Specified by:

addRelationshipFilter in interface Expander

Parameters:

filter - filter to use

Returns:

new instance

toPathExpander

public static PathExpander toPathExpander(RelationshipExpander expander)