org.dspace.content.dao

Interface RelationshipDAO

All Superinterfaces:

GenericDAO<Relationship>

All Known Implementing Classes:

RelationshipDAOImpl

public interface RelationshipDAO
extends GenericDAO<Relationship>

Database Access Object Interface class for the Relationship object The implementation of this class is responsible for all database calls for the Relationship object and is autowired by spring This class should only be accessed from a single service and should never be exposed outside of the API

Method Summary

Modifier and Type	Method and Description
List<Relationship>	findByItem(Context context, Item item) This method returns a list of Relationship objects that have the given Item object as a leftItem or a rightItem
List<Relationship>	findByRelationshipType(Context context, RelationshipType relationshipType) This method returns a list of Relationship objects for the given RelationshipType object.
int	findLeftPlaceByLeftItem(Context context, Item item) This method returns the highest leftplace integer for all the relationships where this item is the leftitem so that we can set a proper leftplace attribute on the next relationship
int	findRightPlaceByRightItem(Context context, Item item) This method returns the highest rightplace integer for all the relationships where this item is the rightitem so that we can set a proper rightplace attribute on the next relationship

Methods inherited from interface org.dspace.core.GenericDAO

create, delete, findAll, findByID, findByID, findMany, findUnique, save

Method Detail

findByItem

List<Relationship> findByItem(Context context,
                              Item item)
                       throws SQLException

This method returns a list of Relationship objects that have the given Item object as a leftItem or a rightItem

Parameters:

context - The relevant DSpace context

item - The item that should be either a leftItem or a rightItem of all the Relationship objects in the returned list

Returns:

The list of Relationship objects that contain either a left or a right item that is equal to the given item

Throws:

SQLException - If something goes wrong

findLeftPlaceByLeftItem

int findLeftPlaceByLeftItem(Context context,
                            Item item)
                     throws SQLException

This method returns the highest leftplace integer for all the relationships where this item is the leftitem so that we can set a proper leftplace attribute on the next relationship

Parameters:

context - The relevant DSpace context

item - The item to be matched on leftItem

Returns:

The integer for the highest leftPlace value for all the relatonship objects that have the given item as leftItem

Throws:

SQLException - If something goes wrong

findRightPlaceByRightItem

int findRightPlaceByRightItem(Context context,
                              Item item)
                       throws SQLException

This method returns the highest rightplace integer for all the relationships where this item is the rightitem so that we can set a proper rightplace attribute on the next relationship

Parameters:

context - The relevant DSpace context

item - The item to be matched on rightItem

Returns:

The integer for the highest rightPlace value for all the relatonship objects that have the given item as rightItem

Throws:

SQLException - If something goes wrong

findByRelationshipType

List<Relationship> findByRelationshipType(Context context,
                                          RelationshipType relationshipType)
                                   throws SQLException

This method returns a list of Relationship objects for the given RelationshipType object. It will construct a list of all Relationship objects that have the given RelationshipType object as the relationshipType property

Parameters:

context - The relevant DSpace context

relationshipType - The RelationshipType object to be checked on

Returns:

A list of Relationship objects that have the given RelationshipType object as the relationshipType property

Throws:

SQLException - If something goes wrong