| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| package org.apache.jena.sparql.core; |
| |
| import static org.apache.jena.sparql.util.graph.GraphUtils.triples2quadsDftGraph ; |
| |
| import java.util.Iterator ; |
| import java.util.List ; |
| import java.util.Objects ; |
| |
| import org.apache.jena.atlas.iterator.Iter ; |
| import org.apache.jena.atlas.iterator.IteratorConcat ; |
| import org.apache.jena.graph.Graph ; |
| import org.apache.jena.graph.Node ; |
| import org.apache.jena.shared.JenaException ; |
| import static org.apache.jena.sparql.util.graph.GraphUtils.* ; |
| |
| /** Base class for implementations of a DatasetGraph as a set of graphs. |
| * This can be a fixed collection or a changeable collection depending |
| * on the implementation of getDefaultGraph()/getGraph(Node) |
| */ |
| public abstract class DatasetGraphCollection extends DatasetGraphBaseFind |
| { |
| @Override |
| public void add(Quad quad) |
| { |
| Graph g = fetchGraph(quad.getGraph()) ; |
| if ( g == null ) |
| throw new JenaException("No such graph: "+quad.getGraph()) ; |
| g.add(quad.asTriple()) ; |
| } |
| |
| @Override |
| public void delete(Quad quad) |
| { |
| Graph g = fetchGraph(quad.getGraph()) ; |
| if ( g == null ) |
| throw new JenaException("No such graph: "+quad.getGraph()) ; |
| g.delete(quad.asTriple()) ; |
| } |
| |
| @Override |
| protected Iterator<Quad> findInDftGraph(Node s, Node p , Node o) |
| { |
| return triples2quadsDftGraph(getDefaultGraph().find(s, p, o)) ; |
| } |
| |
| @Override |
| protected Iter<Quad> findInSpecificNamedGraph(Node g, Node s, Node p , Node o) |
| { |
| Graph graph = fetchGraph(g) ; |
| if ( graph == null ) |
| return Iter.nullIter() ; |
| return triples2quads(g, graph.find(s, p, o)) ; |
| } |
| |
| @Override |
| protected Iterator<Quad> findInAnyNamedGraphs(Node s, Node p, Node o) |
| { |
| Iterator<Node> gnames = listGraphNodes() ; |
| IteratorConcat<Quad> iter = new IteratorConcat<>() ; |
| |
| // Named graphs |
| for ( ; gnames.hasNext() ; ) |
| { |
| Node gn = gnames.next(); |
| Iterator<Quad> qIter = findInSpecificNamedGraph(gn, s, p, o) ; |
| if ( qIter != null ) |
| iter.add(qIter) ; |
| } |
| return iter ; |
| } |
| |
| @Override |
| public abstract Iterator<Node> listGraphNodes() ; |
| |
| @Override |
| public void clear() { |
| // Delete all triples in the default graph |
| getDefaultGraph().clear() ; |
| // Now remove the named graphs (but don't clear them - they may be shared). |
| List<Node> gnList = Iter.toList(listGraphNodes()) ; |
| for ( Node gn : gnList ) { |
| removeGraph(gn) ; |
| } |
| } |
| |
| protected Graph fetchGraph(Node gn) |
| { |
| if ( Quad.isDefaultGraph(gn) || Objects.equals(gn,Quad.tripleInQuad)) // Not preferred style |
| return getDefaultGraph() ; |
| else |
| return getGraph(gn) ; |
| } |
| } |