| /* |
| * 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.arq.querybuilder.updatebuilder; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.jena.graph.Node; |
| import org.apache.jena.graph.Triple; |
| import org.apache.jena.sparql.core.Quad; |
| import org.apache.jena.sparql.core.Var; |
| import org.apache.jena.util.iterator.ExtendedIterator; |
| import org.apache.jena.util.iterator.WrappedIterator; |
| |
| /** |
| * An QuadHolder that creates quads from a collection or iterator of triples. |
| * |
| */ |
| public class CollectionQuadHolder implements QuadHolder { |
| |
| private final Set<Triple> collection; |
| private final Node defaultGraphName; |
| private Map<Var, Node> values; |
| |
| /** |
| * Constructor. |
| * |
| * @param graph |
| * the default graph name for the triples |
| * @param triples |
| * the collection of triples. |
| */ |
| public CollectionQuadHolder(final Node graph, Collection<Triple> triples) { |
| this.collection = new HashSet<Triple>(); |
| this.collection.addAll( triples ); |
| defaultGraphName = graph; |
| } |
| |
| /** |
| * Constructor. |
| * |
| * @param graph |
| * the default graph name for the triples |
| * @param triples |
| * the iterator of triples. |
| */ |
| public CollectionQuadHolder(final Node graph, Iterator<Triple> triples) { |
| this.collection = WrappedIterator.create( triples ).toSet(); |
| defaultGraphName = graph; |
| } |
| |
| /** |
| * Constructor. Uses Quad.defaultGraphNodeGenerated for the graph name. |
| * |
| * @see Quad#defaultGraphNodeGenerated |
| * @param triples |
| * the collection of triples. |
| */ |
| public CollectionQuadHolder(final Collection<Triple> triples) { |
| this( Quad.defaultGraphNodeGenerated, triples ); |
| } |
| |
| /** |
| * Constructor. |
| * |
| * @param triples |
| * the iterator of triples. |
| */ |
| public CollectionQuadHolder(Iterator<Triple> triples) { |
| this.collection = WrappedIterator.create( triples ).toSet(); |
| defaultGraphName = Quad.defaultGraphNodeGenerated; |
| } |
| |
| private Node valueMap( Node n ) |
| { |
| if (n.isVariable()) |
| { |
| Var v = Var.alloc(n); |
| return values.getOrDefault(v, n); |
| } |
| return n; |
| } |
| |
| @Override |
| public ExtendedIterator<Quad> getQuads() { |
| if (values == null) |
| { |
| values = Collections.emptyMap(); |
| } |
| return WrappedIterator.create(collection.iterator()) |
| .mapWith( triple -> new Triple( |
| valueMap(triple.getSubject()), |
| valueMap(triple.getPredicate()), |
| valueMap(triple.getObject()) |
| )) |
| .mapWith( triple -> new Quad( defaultGraphName, triple ) ); |
| } |
| |
| |
| |
| /** |
| * This implementation does nothing. |
| */ |
| @Override |
| public QuadHolder setValues(final Map<Var, Node> values) { |
| this.values = values; |
| return this; |
| } |
| |
| } |