eu.ehri.project.models.utils

Class JavaHandlerUtils

java.lang.Object

eu.ehri.project.models.utils.JavaHandlerUtils

public final class JavaHandlerUtils
extends Object

Utilities for dealing with Gremlin pipelines and common graph-manipulation functions.

Field Summary

Fields

Modifier and Type	Field and Description
static com.tinkerpop.pipes.PipeFunction<com.tinkerpop.pipes.branch.LoopPipe.LoopBundle<com.tinkerpop.blueprints.Vertex>,Boolean>	defaultMaxLoops Pipe function with a max loop clause with the default of 20.
static org.slf4j.Logger	logger
static com.tinkerpop.pipes.PipeFunction<com.tinkerpop.pipes.branch.LoopPipe.LoopBundle<com.tinkerpop.blueprints.Vertex>,Boolean>	noopLoopFunc Pipe function that always allows looping to continue.

Constructor Summary

Constructors

Constructor and Description
JavaHandlerUtils()

Method Summary

Modifier and Type	Method and Description
static boolean	addSingleRelationship(com.tinkerpop.blueprints.Vertex from, com.tinkerpop.blueprints.Vertex to, String label) Add a relationship in such a way that it is the only one of its type from the source to the target.
static boolean	addUniqueRelationship(com.tinkerpop.blueprints.Vertex from, com.tinkerpop.blueprints.Vertex to, String label) Add a relationship that can only exist once between source and target.
static <S,E> void	cacheCount(com.tinkerpop.blueprints.Element element, com.tinkerpop.gremlin.java.GremlinPipeline<S,E> pipe, String propName) Given a pipeline
static boolean	hasEdge(com.tinkerpop.blueprints.Vertex vertex, com.tinkerpop.blueprints.Direction direction, String... labels) Check if a vertex has edges with the given direct/label.
static boolean	hasRelationship(com.tinkerpop.blueprints.Vertex from, com.tinkerpop.blueprints.Vertex to, String... labels) Determine if a relationship with the given label(s) exists between source and target vertex.
static boolean	removeAllRelationships(com.tinkerpop.blueprints.Vertex from, com.tinkerpop.blueprints.Vertex to, String... labels) Remove all relationships with the given labels between source and target vertex.

Methods inherited from class java.lang.Object

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

Field Detail

logger

public static final org.slf4j.Logger logger

defaultMaxLoops

public static final com.tinkerpop.pipes.PipeFunction<com.tinkerpop.pipes.branch.LoopPipe.LoopBundle<com.tinkerpop.blueprints.Vertex>,Boolean> defaultMaxLoops

Pipe function with a max loop clause with the default of 20.

noopLoopFunc

public static final com.tinkerpop.pipes.PipeFunction<com.tinkerpop.pipes.branch.LoopPipe.LoopBundle<com.tinkerpop.blueprints.Vertex>,Boolean> noopLoopFunc

Pipe function that always allows looping to continue.

Constructor Detail

JavaHandlerUtils

public JavaHandlerUtils()

Method Detail

cacheCount

public static <S,E> void cacheCount(com.tinkerpop.blueprints.Element element,
                                    com.tinkerpop.gremlin.java.GremlinPipeline<S,E> pipe,
                                    String propName)

Given a pipeline

Parameters:

element - The element

propName - The cache property name

pipe - A pipeline to count

addSingleRelationship

public static boolean addSingleRelationship(com.tinkerpop.blueprints.Vertex from,
                                            com.tinkerpop.blueprints.Vertex to,
                                            String label)

Add a relationship in such a way that it is the only one of its type from the source to the target.

Parameters:

from - The source vertex

to - The target vertex

label - The relationship label name

Returns:

Whether or not changes were made to the graph.

addUniqueRelationship

public static boolean addUniqueRelationship(com.tinkerpop.blueprints.Vertex from,
                                            com.tinkerpop.blueprints.Vertex to,
                                            String label)

Add a relationship that can only exist once between source and target.

Parameters:

from - The source vertex

to - The target vertex

label - The relationship label name

Returns:

Whether or not changes were made to the graph.

hasRelationship

public static boolean hasRelationship(com.tinkerpop.blueprints.Vertex from,
                                      com.tinkerpop.blueprints.Vertex to,
                                      String... labels)

Determine if a relationship with the given label(s) exists between source and target vertex.

Parameters:

from - The source vertex

to - The target vertex

labels - The set of labels

Returns:

If a matching relationship is found

removeAllRelationships

public static boolean removeAllRelationships(com.tinkerpop.blueprints.Vertex from,
                                             com.tinkerpop.blueprints.Vertex to,
                                             String... labels)

Remove all relationships with the given labels between source and target vertex.

Parameters:

from - The source vertex

to - The target vertex

labels - The set of labels

hasEdge

public static boolean hasEdge(com.tinkerpop.blueprints.Vertex vertex,
                              com.tinkerpop.blueprints.Direction direction,
                              String... labels)

Check if a vertex has edges with the given direct/label.

Parameters:

vertex - The source vertex

direction - The edge direction

labels - The set of labels

Returns:

Whether any edges exist