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A library for core classes (Graph, Vertex, Edge, etc.)
There is a newer version: 2.11.0
package io.konig.core.io;

import java.util.ArrayList;

/*
 * #%L
 * Konig Core
 * %%
 * Copyright (C) 2015 - 2017 Gregory McFall
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */


import java.util.HashSet;
import java.util.List;
import java.util.Map.Entry;
import java.util.Set;

import org.openrdf.model.BNode;
import org.openrdf.model.Resource;
import org.openrdf.model.URI;
import org.openrdf.model.Value;

import io.konig.core.Edge;
import io.konig.core.Graph;
import io.konig.core.OwlReasoner;
import io.konig.core.Vertex;

public class VertexCopier {
	
	private List excludeClass = new ArrayList<>();
	private List excludeProperty = new ArrayList<>();
	private OwlReasoner reasoner;
	
	public VertexCopier() {
	}
	
	/**
	 * Copy a vertex to a specified graph by traversing all outgoing
	 * edges recursively.
	 * 
	 * @param v The vertex to be copied.
	 * @param g The graph into which the vertex is to be copied.
	 */
	public void deepCopy(Vertex v, Graph g) {
		reasoner = new OwlReasoner(v.getGraph());
		Set memory = new HashSet<>();
		Resource id = v.getId();
		memory.add(id);
		Vertex w = g.vertex(v.getId());
		copy(memory, v, w);
	}
	
	public void excludeProperty(URI...predicate) {
		for (URI propertyId : predicate) {
			excludeProperty.add(propertyId);
		}
	}
	
	public void excludeClass(Resource...type) {
		for (Resource owlClass : type) {
			excludeClass.add(owlClass);
		}
	}

	private void copy(Set memory, Vertex v, Vertex w) {
		
		if (!excluded(v)) {
		
			for (Entry> out : v.outEdges()) {
				URI predicate = out.getKey();
				for (Edge edge : out.getValue()) {
					Value object = edge.getObject();
					w.addProperty(predicate, object);
					if (object instanceof Resource) {
						Resource objectId = (Resource) object;
						if (!memory.contains(objectId) && ((objectId instanceof BNode) || !excludeProperty.contains(predicate))) {
							memory.add(objectId);
							Vertex x = v.getGraph().vertex(objectId);
							Vertex y = w.getGraph().vertex(objectId);
							copy(memory, x, y);
						}
					}
				}
			}
		}
		
	}

	private boolean excluded(Vertex v) {
		for (Resource type : excludeClass) {
			if (reasoner.isTypeOf(v.getId(), type)) {
				return true;
			}
		}
		return false;
	}

}