package graph
import (
"context"
)
// A node in a property graph
type Node struct {
// Unique ID for the node.
// The consumer of the graph is responsible for ensuring uniqueness.
ID string
// Label for the node. This is usually the type of the node.
// In a quad store, this would be the context of the quad.
Label string
// Properties for the node.
Properties map[string]string
}
// An edge in a property graph
type Edge struct {
// Identifier for the type of relationship.
Name string
// The label for the edge. This is usually the type of the edge.
// In a quad store, this would be the context of the quad.
Label string
// Properties for the edge.
Properties map[string]string
// The node the edge is coming from.
From *Node
// The node the edge is going to.
To *Node
}
// The result of a query on the graph. The results depends
// on the implementation specific query executed on the graph
type QueryResult interface {
// Return the results as a slice of strings
Strings() ([]string, error)
// Return the results as list of nodes
// that matches a path query
Nodes() ([]Node, error)
}
type Graph interface {
// Create a link in the graph between two Node using the Edge
Link(link *Edge) error
// Query the graph using an implementation-specific query language
Query(ctx context.Context, query string) (QueryResult, error)
// Close the graph
Close() error
}
// Configuration for property graph implementations that
// uses local file system as the storage
type LocalPropertyGraphConfig struct {
Name string
DatabasePath string
OpenExisting bool
}
