Package org.odpi.openmetadata.repositoryservices.connectors.stores.metadatacollectionstore.properties.instances

Class InstanceGraph

  • All Implemented Interfaces:
    Serializable
    public class InstanceGraph
extends InstanceElementHeader
    InstanceGraph stores a subgraph of entities and relationships and provides methods to access its content. It stores a list of entities and a list of relationships. It is possible to request a list for each of these two lists, or request elements that link to a specific element. For example, request the relationships that link to an entity or the entity at a specific end of a relationship.
    See Also:
    Serialized Form

    • Constructor Detail

      • InstanceGraph

        public InstanceGraph()
        Default constructor

      • InstanceGraph

        public InstanceGraph​(List<EntityDetail> entities,
                     List<Relationship> relationships)
        Typical Constructor creates a graph with the supplied list of elements. It assumes the caller has supplied elements that do link together. However, this graph supports graph fragments.
        Parameters:
        entities - list of entity elements to add to the list
        relationships - list of relationship elements to add to the list

      • InstanceGraph

        public InstanceGraph​(InstanceGraph templateGraph)
        Copy/clone constructor.
        Parameters:
        templateGraph - graph to copy; null to create an empty graph

    • Method Detail

      • getEntities

        public List<EntityDetail> getEntities()
        Return the list of all the entities (vertices/nodes) in the instance graph. Null means empty graph.
        Returns:
        EntityDetails entity list

      • setEntities

        public void setEntities​(List<EntityDetail> entityElementList)
        Set up the list of entities for this instance graph.
        Parameters:
        entityElementList - list of entities

      • getRelationships

        public List<Relationship> getRelationships()
        Return the list of all relationships (edges/links) in the instance graph. Null means a disconnected/empty graph.
        Returns:
        Relationships relationship list

      • setRelationships

        public void setRelationships​(List<Relationship> relationshipElementList)
        Set up the list of relationships in this instance graph.
        Parameters:
        relationshipElementList - list of relationships

      • returnRelationshipsForEntity

        public List<Relationship> returnRelationshipsForEntity​(String anchorEntityGUID)
        Return a list of relationships that are connected to a specific entity.
        Parameters:
        anchorEntityGUID - unique identifier for an entity
        Returns:
        Relationships relationship iterator

      • returnLinkedEntity

        public EntityDetail returnLinkedEntity​(String anchorEntityGUID,
                                       String linkingRelationshipGUID)
        Return the entity connected at the far end of an entity's relationship.
        Parameters:
        anchorEntityGUID - unique id for the known entity.
        linkingRelationshipGUID - the relationship to traverse.
        Returns:
        EntityDetail the requested entity at the far end of the relationship. Null if the relationship or entity is not found.

      • returnEntityElementCount

        public int returnEntityElementCount()
        Return the number of entities in the graph.
        Returns:
        elementCount for entities

      • returnRelationshipElementCount

        public int returnRelationshipElementCount()
        Return the number of relationships in the graph.
        Returns:
        elementCount for relationships

      • toString

        public String toString()
        Standard toString method.
        Overrides:
        toString in class Object
        Returns:
        JSON style description of variables.

      • equals

        public boolean equals​(Object objectToCompare)
        Validate that an object is equal depending on their stored values.
        Overrides:
        equals in class Object
        Parameters:
        objectToCompare - object
        Returns:
        boolean result

      • hashCode

        public int hashCode()
        Return a hash code based on the values of this object.
        Overrides:
        hashCode in class Object
        Returns:
        in hash code