org.hibernate.ogm.datastore.neo4j.dialect.impl

Class Neo4jEntityQueries

java.lang.Object

org.hibernate.ogm.datastore.neo4j.dialect.impl.Neo4jEntityQueries

public class Neo4jEntityQueries
extends Object

Container for the queries related to one entity type in Neo4j. Unfortunately, we cannot use the same queries for all entities, as Neo4j does not allow to parameterize on node labels which would be required, as the entity name is stored as a label.

Author:

Davide D'Alto

Constructor Summary

Constructors

Constructor and Description
Neo4jEntityQueries(EntityKeyMetadata entityKeyMetadata)

Method Summary

Modifier and Type	Method and Description
protected static void	appendEntityNode(String alias, EntityKeyMetadata entityKeyMetadata, StringBuilder queryBuilder)
protected static void	appendLabel(EntityKeyMetadata entityKeyMetadata, StringBuilder queryBuilder)
protected static void	appendMatchOwnerEntityNode(StringBuilder queryBuilder, EntityKeyMetadata ownerEntityKeyMetadata)
protected static void	appendProperties(EntityKeyMetadata entityKeyMetadata, StringBuilder queryBuilder)
protected static void	appendProperties(StringBuilder queryBuilder, String[] columnNames, int offset)
protected static void	appendRelationshipType(StringBuilder queryBuilder, String relationshipType)
org.neo4j.graphdb.Node	createEmbedded(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine, Object[] columnValues) Create a single node representing an embedded element.
org.neo4j.graphdb.ResourceIterator<org.neo4j.graphdb.Relationship>	findAssociation(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine, Object[] columnValues, String role) Find the relationships representing the association.
org.neo4j.graphdb.ResourceIterator<org.neo4j.graphdb.Node>	findEntities(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine) Find all the node representing the entity.
org.neo4j.graphdb.Node	findEntity(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine, Object[] columnValues) Find the node corresponding to an entity.
org.neo4j.graphdb.Node	insertEntity(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine, Object[] columnValues) Creates the node corresponding to an entity.
protected Map<String,Object>	params(Object[] columnValues)
protected Map<String,Object>	params(Object[] columnValues, int offset)
void	removeEntity(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine, Object[] columnValues) Remove the nodes representing the entity and the embedded elements attached to it.
protected <T> T	singleResult(org.neo4j.cypher.javacompat.ExecutionResult result)
void	updateEmbeddedColumn(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine, Object[] keyValues, String embeddedColumn, Object value) Update the value of an embedded node property.

Methods inherited from class java.lang.Object

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

Constructor Detail

Neo4jEntityQueries

public Neo4jEntityQueries(EntityKeyMetadata entityKeyMetadata)

Method Detail

findAssociation

public org.neo4j.graphdb.ResourceIterator<org.neo4j.graphdb.Relationship> findAssociation(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine,
                                                                                          Object[] columnValues,
                                                                                          String role)

Find the relationships representing the association.

Parameters:

executionEngine - the queries executor

columnValues - the values for the entity key column names of the owner node

role - the relationship type mapping the role of the association

Returns:

an iterator on the the results

createEmbedded

public org.neo4j.graphdb.Node createEmbedded(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine,
                                             Object[] columnValues)

Create a single node representing an embedded element.

Parameters:

executionEngine - the ExecutionEngine used to run the query

columnValues - the values in EntityKey.getColumnValues()

Returns:

the corresponding node;

findEntity

public org.neo4j.graphdb.Node findEntity(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine,
                                         Object[] columnValues)

Find the node corresponding to an entity.

Parameters:

executionEngine - the ExecutionEngine used to run the query

columnValues - the values in EntityKey.getColumnValues()

Returns:

the corresponding node

insertEntity

public org.neo4j.graphdb.Node insertEntity(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine,
                                           Object[] columnValues)

Creates the node corresponding to an entity.

Parameters:

executionEngine - the ExecutionEngine used to run the query

columnValues - the values in EntityKey.getColumnValues()

Returns:

the corresponding node

findEntities

public org.neo4j.graphdb.ResourceIterator<org.neo4j.graphdb.Node> findEntities(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine)

Find all the node representing the entity.

Parameters:

executionEngine - the ExecutionEngine used to run the query

Returns:

an iterator over the nodes representing an entity

removeEntity

public void removeEntity(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine,
                         Object[] columnValues)

Remove the nodes representing the entity and the embedded elements attached to it.

Parameters:

executionEngine - the ExecutionEngine used to run the query

columnValues - the values of the key identifying the entity to remove

updateEmbeddedColumn

public void updateEmbeddedColumn(org.neo4j.cypher.javacompat.ExecutionEngine executionEngine,
                                 Object[] keyValues,
                                 String embeddedColumn,
                                 Object value)

Update the value of an embedded node property.

Parameters:

executionEngine - the ExecutionEngine used to run the query

keyValues - the columns representing the identifier in the entity owning the embedded

embeddedColumn - the column on the embedded node (dot-separated properties)

value - the new value for the property

appendLabel

protected static void appendLabel(EntityKeyMetadata entityKeyMetadata,
                                  StringBuilder queryBuilder)

appendProperties

protected static void appendProperties(EntityKeyMetadata entityKeyMetadata,
                                       StringBuilder queryBuilder)

appendProperties

protected static void appendProperties(StringBuilder queryBuilder,
                                       String[] columnNames,
                                       int offset)

params

protected Map<String,Object> params(Object[] columnValues)

params

protected Map<String,Object> params(Object[] columnValues,
                                    int offset)

appendMatchOwnerEntityNode

protected static void appendMatchOwnerEntityNode(StringBuilder queryBuilder,
                                                 EntityKeyMetadata ownerEntityKeyMetadata)

appendEntityNode

protected static void appendEntityNode(String alias,
                                       EntityKeyMetadata entityKeyMetadata,
                                       StringBuilder queryBuilder)

appendRelationshipType

protected static void appendRelationshipType(StringBuilder queryBuilder,
                                             String relationshipType)

singleResult

protected <T> T singleResult(org.neo4j.cypher.javacompat.ExecutionResult result)