| /** |
| * 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.riot.thrift; |
| |
| import java.io.InputStream ; |
| import java.util.ArrayList ; |
| import java.util.Iterator ; |
| import java.util.List ; |
| |
| import org.apache.jena.atlas.iterator.IteratorSlotted ; |
| import org.apache.jena.graph.Node ; |
| import org.apache.jena.riot.thrift.wire.RDF_DataTuple ; |
| import org.apache.jena.riot.thrift.wire.RDF_Term ; |
| import org.apache.jena.riot.thrift.wire.RDF_VAR ; |
| import org.apache.jena.riot.thrift.wire.RDF_VarTuple ; |
| import org.apache.jena.sparql.core.Var ; |
| import org.apache.jena.sparql.engine.binding.Binding ; |
| import org.apache.jena.sparql.engine.binding.BindingFactory ; |
| import org.apache.jena.sparql.engine.binding.BindingMap ; |
| import org.apache.thrift.TException ; |
| import org.apache.thrift.protocol.TProtocol ; |
| import org.apache.thrift.transport.TIOStreamTransport ; |
| import org.apache.thrift.transport.TTransportException ; |
| |
| /** Converted from SPARQL result set encoded in Thrift to Bindings */ |
| public class Thift2Binding extends IteratorSlotted<Binding> implements Iterator<Binding> { |
| |
| private List<Var> vars = new ArrayList<>() ; |
| private List<String> varNames = new ArrayList<>() ; |
| private final RDF_DataTuple row = new RDF_DataTuple() ; |
| private InputStream in ; |
| private TProtocol protocol ; |
| |
| public Thift2Binding(InputStream in) { |
| this.in = in ; |
| TIOStreamTransport transport = new TIOStreamTransport(in) ; |
| this.protocol = TRDF.protocol(transport) ; |
| readVars() ; |
| } |
| |
| public Thift2Binding(TProtocol out) { |
| this.in = null ; |
| this.protocol = out ; |
| readVars() ; |
| } |
| |
| private void readVars() { |
| RDF_VarTuple vrow = new RDF_VarTuple() ; |
| try { vrow.read(protocol) ; } |
| catch (TException e) { TRDF.exception(e) ; } |
| // ** Java8 |
| // vrow.getVars().forEach(rv -> { |
| // String vn = rv.getName() ; |
| // Var v = Var.alloc(rv.getName()) ; |
| // varNames.add(vn) ; |
| // }) ; |
| for ( RDF_VAR rv : vrow.getVars() ) { |
| String vn = rv.getName() ; |
| Var v = Var.alloc(rv.getName()) ; |
| varNames.add(vn) ; |
| } |
| vars = Var.varList(varNames) ; |
| } |
| |
| public List<Var> getVars() { return vars ; } |
| |
| public List<String> getVarNames() { return varNames ; } |
| |
| |
| @Override |
| protected Binding moveToNext() { |
| try { row.read(protocol) ; } |
| catch (TTransportException e) { return null ; } |
| catch (TException e) { TRDF.exception(e) ; } |
| |
| if ( row.getRowSize() != vars.size() ) |
| throw new RiotThriftException(String.format("Vars %d : Row length : %d", vars.size(), row.getRowSize())) ; |
| |
| BindingMap b = BindingFactory.create() ; |
| |
| for ( int i = 0 ; i < vars.size() ; i++ ) { |
| // Old school |
| Var v = vars.get(i) ; |
| RDF_Term rt = row.getRow().get(i) ; |
| if ( rt.isSetUndefined() ) |
| continue ; |
| Node n = ThriftConvert.convert(rt) ; |
| b.add(v, n) ; |
| } |
| row.clear() ; |
| return b ; |
| } |
| |
| @Override |
| protected boolean hasMore() { |
| return true ; |
| } |
| } |