java.lang.Object
- hydra.pg.Merging

```
public class Merging
extends java.lang.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 Merging.IdAdapters<LiteralType,Literal>`	`STRING_ID_ADAPTERS`

Constructor Summary

Constructors
Constructor Description

Merging()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static <T,V> Either<java.lang.String,StatelessAdapter<java.util.List<EdgeType<T>>,EdgeType<T>,Edge<V>,Edge<V>>>`	`createEdgeAdapter(java.util.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> Either<java.lang.String,StatelessAdapter<java.util.List<VertexType<T>>,VertexType<T>,Vertex<V>,Vertex<V>>>`	`createVertexAdapter(java.util.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, java.util.function.Function<V,Either<java.lang.String,java.lang.String>> fromLiteral, java.util.function.Function<java.lang.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 Detail

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 Detail
- Merging
```
public Merging()
```

Method Detail

createVertexAdapter

public static <T,V> Either<java.lang.String,StatelessAdapter<java.util.List<VertexType<T>>,VertexType<T>,Vertex<V>,Vertex<V>>> createVertexAdapter(java.util.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:: an Either containing a stateless adapter for the merged vertex type, or an error

createEdgeAdapter

public static <T,V> Either<java.lang.String,StatelessAdapter<java.util.List<EdgeType<T>>,EdgeType<T>,Edge<V>,Edge<V>>> createEdgeAdapter(java.util.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:: an Either containing a stateless adapter for the merged edge type, or an error

stringIdAdapters

public static <T,V> Merging.IdAdapters<T,V> stringIdAdapters(T stringType,
                                                                         java.util.function.Function<V,Either<java.lang.String,java.lang.String>> fromLiteral,
                                                                         java.util.function.Function<java.lang.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

Class Merging