GraphAr Info

The graphar-info module is part of the pure Java implementation of GraphAr.

Key Features

The java-info module offers a lightweight, zero-dependencies yet powerful solution for GraphAr metadata management. It is responsible for:

• Loading & Saving Metadata: Read and write GraphAr metadata files in YAML format.
• Schema Parsing: Extract graph schema definitions (e.g., vertex/edge types, properties).
• Storage Information Retrieval: Obtain detailed storage information from metadata, including file URIs, chunk sizes, etc.

Building

To build the graphar-info module, you need:

• JDK 11 or higher
• Maven 3.5 or higher

Build the module with Maven:

mvn clean install

Usage

Here's a simple example of how to use the graphar-info module:

For more usage examples and detailed information, please refer to Getting Started with Info Module.

import org.apache.graphar.info.GraphInfo;
import org.apache.graphar.info.loader.GraphInfoLoader;
import org.apache.graphar.info.loader.impl.LocalFileSystemStreamGraphInfoLoader;

// Load graph info from a YAML file
GraphInfoLoader loader = new LocalFileSystemStreamGraphInfoLoader();
GraphInfo graphInfo = loader.loadGraphInfo(Paths.get("path/to/graph.yml").toUri());

// Access graph metadata
String graphName = graphInfo.getName();
List<VertexInfo> vertices = graphInfo.getVertexInfos();
List<EdgeInfo> edges = graphInfo.getEdgeInfos();

// Access vertex metadata
VertexInfo personVertex = vertices.get(0);
String vertexType = personVertex.getType();
long chunkSize = personVertex.getChunkSize();

// Access edge metadata
EdgeInfo knowsEdge = edges.get(0);
String edgeType = knowsEdge.getEdgeType();
boolean isDirected = knowsEdge.isDirected();

Dependencies

The graphar-info module has minimal dependencies:

• SnakeYAML for YAML parsing (shaded in the JAR)

Under active development