| /* |
| * 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.engine.iterator; |
| |
| import org.apache.jena.atlas.io.IndentedWriter; |
| import org.apache.jena.graph.Node; |
| import org.apache.jena.graph.NodeFactory; |
| import org.apache.jena.graph.Triple; |
| import org.apache.jena.sparql.core.Substitute; |
| import org.apache.jena.sparql.core.Var; |
| import org.apache.jena.sparql.engine.ExecutionContext; |
| import org.apache.jena.sparql.engine.QueryIterator; |
| import org.apache.jena.sparql.engine.binding.Binding; |
| import org.apache.jena.sparql.engine.binding.BindingFactory; |
| import org.apache.jena.sparql.serializer.SerializationContext; |
| |
| /** |
| * Add {@code (var, matchTriple)} to a {@link QueryIterator}. |
| * <p> |
| * The supplied triple is a triple pattern which is grounded by replacing variables |
| * with terms from the current binding. It is an error not to have substitutions for |
| * all variables and results in the original binding unchanged. |
| */ |
| public class QueryIterAddTripleTerm extends QueryIterTriplePattern { |
| private final Triple triple; |
| private final Var var; |
| |
| public QueryIterAddTripleTerm(QueryIterator chain, Var var, Triple triple, ExecutionContext execContext) { |
| super(chain, triple, execContext); |
| this.triple = triple; |
| this.var = var; |
| } |
| |
| @Override |
| protected Binding moveToNextBinding() { |
| Binding binding = super.moveToNextBinding(); |
| Triple matchedTriple = Substitute.substitute(triple, binding); |
| if ( ! matchedTriple.isConcrete() ) |
| // Not all concrete terms. |
| return binding; |
| Node nt = NodeFactory.createTripleNode(matchedTriple); |
| Binding b = BindingFactory.binding(binding, var, nt); |
| return b; |
| } |
| |
| @Override |
| protected void details(IndentedWriter out, SerializationContext sCxt) { |
| out.print(this.getClass().getSimpleName()+": ["+var+"] " + triple); |
| } |
| } |