JanusGraph: Get outgoing and incoming vertices of the edge

'bothVertices()' method return both the outgoing and incoming vertices of this edge.

 

public default Iterator<Vertex> bothVertices()

The first vertex in the iterator is the outgoing vertex. The second vertex in the iterator is the incoming vertex.

 

Example

Iterator<Vertex> vertexIterator = janusGraphEdge.bothVertices();

Vertex outgoingVertex = vertexIterator.next();

Vertex incomingVertex = vertexIterator.next();

 

Find the below working application.

 

EdgeBothVertices.java

package com.sample.app.edges;

import java.util.Iterator;

import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.janusgraph.core.JanusGraph;
import org.janusgraph.core.JanusGraphEdge;
import org.janusgraph.core.JanusGraphFactory;
import org.janusgraph.core.JanusGraphVertex;

public class EdgeBothVertices {
	public static void main(String args[]) {

		try (JanusGraph janusGraph = JanusGraphFactory.open("/Users/Shared/janus.properties")) {
			// Create a person vertex
			JanusGraphVertex krishnaVertex = janusGraph.addVertex("person");
			krishnaVertex.property("name", "Krishna");
			krishnaVertex.property("age", 31);
			krishnaVertex.property("gender", 'M');

			// Create a person vertex
			JanusGraphVertex ramVertex = janusGraph.addVertex("person");
			ramVertex.property("name", "Ram");
			ramVertex.property("age", 34);
			ramVertex.property("gender", 'M');

			JanusGraphEdge janusGraphEdge = ramVertex.addEdge("knows", krishnaVertex, "from", 2017, "colleague", "N");

			janusGraph.tx().commit();

			Iterator<Vertex> vertexIterator = janusGraphEdge.bothVertices();

			Vertex outgoingVertex = vertexIterator.next();
			Vertex incomingVertex = vertexIterator.next();

			System.out.println(outgoingVertex.property("name").value() + " knows " + incomingVertex.property("name").value());

		} finally {
			System.out.println("\nDone!!!");
		}

	}
}

Output

Ram knows Krishna

Done!!!

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