Package hydra.pg

Class Merging

java.lang.Object

hydra.pg.Merging

public class Merging
extends Object

Utilities for combining multiple vertex or edge types into a single "merged" vertex or edge type, and correspondingly encoding and decoding vertices and edges of these types.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Merging.IdAdapters<T,V>	A helper object which defines merged vertex and edge id types, and a value coder for each vertex and edge label.

Field Summary

Fields

Modifier and Type	Field	Description
static EdgeLabel	DEFAULT_EDGE_LABEL
static VertexLabel	DEFAULT_VERTEX_LABEL
static final Merging.IdAdapters<LiteralType,Literal>	STRING_ID_ADAPTERS

Constructor Summary

Constructors

Constructor	Description
Merging()

Method Summary

Modifier and Type	Method	Description
static <T, V> Flow<Unit,StatelessAdapter<List<EdgeType<T>>,EdgeType<T>,Edge<V>,Edge<V>>>	createEdgeAdapter(List<EdgeType<T>> types, Merging.IdAdapters<T,V> idAdapters, boolean unifyIdenticalTypes)	Create an edge adapter based on a list of edge types and given id adapters.
static <T, V> Flow<Unit,StatelessAdapter<List<VertexType<T>>,VertexType<T>,Vertex<V>,Vertex<V>>>	createVertexAdapter(List<VertexType<T>> types, Merging.IdAdapters<T,V> idAdapters, boolean unifyIdenticalTypes)	Create a vertex adapter based on a list of vertex types and given id adapters.
static <T, V> Merging.IdAdapters<T,V>	stringIdAdapters(T stringType, Function<V,Flow<Unit,String>> fromLiteral, Function<String,V> toLiteral)	Create string-based id adapters for merging vertex and edge types.

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_VERTEX_LABEL

public static VertexLabel DEFAULT_VERTEX_LABEL

DEFAULT_EDGE_LABEL

public static EdgeLabel DEFAULT_EDGE_LABEL

STRING_ID_ADAPTERS

public static final Merging.IdAdapters<LiteralType,Literal> STRING_ID_ADAPTERS

Constructor Details

Merging

public Merging()

Method Details

createVertexAdapter

public static <T,
V>
Flow<Unit,StatelessAdapter<List<VertexType<T>>,VertexType<T>,Vertex<V>,Vertex<V>>> createVertexAdapter(List<VertexType<T>> types,
 Merging.IdAdapters<T,V> idAdapters,
 boolean unifyIdenticalTypes)

Create a vertex adapter based on a list of vertex types and given id adapters.

Type Parameters:

T - the type parameter for vertex types

V - the value type for vertex properties

Parameters:

types - the list of vertex types to merge

idAdapters - the id adapters for encoding/decoding vertex and edge ids

unifyIdenticalTypes - whether to unify identical property types across vertex types

Returns:

a flow producing a stateless adapter for the merged vertex type

createEdgeAdapter

public static <T,
V>
Flow<Unit,StatelessAdapter<List<EdgeType<T>>,EdgeType<T>,Edge<V>,Edge<V>>> createEdgeAdapter(List<EdgeType<T>> types,
 Merging.IdAdapters<T,V> idAdapters,
 boolean unifyIdenticalTypes)

Create an edge adapter based on a list of edge types and given id adapters.

Type Parameters:

T - the type parameter for edge types

V - the value type for edge properties

Parameters:

types - the list of edge types to merge

idAdapters - the id adapters for encoding/decoding vertex and edge ids

unifyIdenticalTypes - whether to unify identical property types across edge types

Returns:

a flow producing a stateless adapter for the merged edge type

stringIdAdapters

public static <T,
V> Merging.IdAdapters<T,V> stringIdAdapters(T stringType,
 Function<V,Flow<Unit,String>> fromLiteral,
 Function<String,V> toLiteral)

Create string-based id adapters for merging vertex and edge types.

Type Parameters:

T - the type parameter for id types

V - the value type for ids

Parameters:

stringType - the string type to use for merged ids

fromLiteral - function to extract a string from a literal value

toLiteral - function to create a literal value from a string

Returns:

id adapters configured for string-based ids