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A library for core classes (Graph, Vertex, Edge, etc.)
package io.konig.core;
import java.util.LinkedList;
import org.openrdf.model.BNode;
/*
* #%L
* konig-core
* %%
* Copyright (C) 2015 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 org.openrdf.model.Literal;
import org.openrdf.model.Resource;
import org.openrdf.model.URI;
import org.openrdf.model.Value;
import org.openrdf.model.ValueFactory;
import org.openrdf.model.impl.BNodeImpl;
import org.openrdf.model.impl.LiteralImpl;
import org.openrdf.model.impl.URIImpl;
import org.openrdf.model.impl.ValueFactoryImpl;
import org.openrdf.model.vocabulary.RDF;
import org.openrdf.model.vocabulary.XMLSchema;
import io.konig.core.impl.KonigLiteral;
public class GraphBuilder {
private Graph graph;
private ValueFactory valueFactory;
private LinkedList stack = new LinkedList<>();
public GraphBuilder(Graph graph) {
this.graph = graph;
valueFactory = new ValueFactoryImpl();
}
public GraphBuilder statement(Resource subject, URI predicate, Value object) {
graph.edge(subject, predicate, object);
return this;
}
public GraphBuilder objectProperty(String subject, String predicate, String object) {
graph.edge(uri(subject), uri(predicate), uri(object));
return this;
}
public GraphBuilder literalProperty(String subject, String predicate, String object) {
graph.edge(uri(subject), uri(predicate), literal(object));
return this;
}
public GraphBuilder literalProperty(Resource subject, URI predicate, String object) {
graph.edge(subject, predicate, literal(object));
return this;
}
public Literal literal(String value) {
return valueFactory.createLiteral(value);
}
public URI uri(String value) {
return valueFactory.createURI(value);
}
public GraphBuilder beginSubject() {
BNode bnode = new BNodeImpl(UidGenerator.INSTANCE.next());
return beginSubject(bnode);
}
public GraphBuilder beginSubject(Vertex v) {
return beginSubject(v.getId());
}
public GraphBuilder beginSubject(String iri) {
return beginSubject(new URIImpl(iri));
}
public GraphBuilder beginBNode(URI predicate) {
Vertex v = graph.vertex();
addProperty(predicate, v.getId());
return beginSubject(v.getId());
}
public GraphBuilder beginSubject(Resource subject) {
stack.add(subject);
return this;
}
public GraphBuilder endSubject() {
stack.removeLast();
return this;
}
public Resource peek() {
return stack.getLast();
}
public Resource pop() {
return stack.removeLast();
}
public GraphBuilder addProperty(URI predicate, Vertex object) {
return addProperty(predicate, object.getId());
}
public GraphBuilder addProperty(URI predicate, Value object) {
return statement(peek(), predicate, object);
}
public GraphBuilder addLangString(URI predicate, String value, String language) {
return addProperty(predicate, new LiteralImpl(value, language));
}
public GraphBuilder addTypedLiteral(URI predicate, String value, URI type) {
return addProperty(predicate, new LiteralImpl(value, type));
}
public GraphBuilder addList(URI predicate, Value...object) {
Resource subject = peek();
Resource list = graph.vertex().getId();
graph.edge(subject, predicate, list);
for (int i=0; i