| /* |
| * 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.algebra.table ; |
| |
| import java.util.ArrayList ; |
| import java.util.Iterator ; |
| import java.util.List ; |
| |
| 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.iterator.QueryIterPlainWrapper ; |
| |
| public class TableN extends TableBase { |
| protected List<Binding> rows = new ArrayList<>() ; |
| protected List<Var> vars = new ArrayList<>() ; |
| |
| public TableN() {} |
| |
| public TableN(List<Var> vars) { |
| if ( vars != null ) |
| this.vars = vars ; |
| } |
| |
| /** |
| * Build table from an iterator. |
| * This operation reads the QueryIterator to |
| * completion when creating the table. |
| */ |
| public TableN(QueryIterator qIter) { |
| materialize(qIter) ; |
| } |
| |
| protected TableN(List<Var> variables, List<Binding> rows) { |
| this.vars = variables ; |
| this.rows = rows ; |
| } |
| |
| private void materialize(QueryIterator qIter) { |
| while (qIter.hasNext()) { |
| Binding binding = qIter.nextBinding() ; |
| addBinding(binding) ; |
| } |
| qIter.close() ; |
| } |
| |
| @Override |
| public void addBinding(Binding binding) { |
| for (Iterator<Var> names = binding.vars(); names.hasNext();) { |
| Var v = names.next() ; |
| if ( !vars.contains(v) ) |
| vars.add(v) ; |
| } |
| rows.add(binding) ; |
| } |
| |
| @Override |
| public int size() { |
| return rows.size() ; |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return rows.isEmpty() ; |
| } |
| |
| @Override |
| public Iterator<Binding> rows() { |
| return rows.iterator() ; |
| } |
| |
| @Override |
| public QueryIterator iterator(ExecutionContext execCxt) { |
| return QueryIterPlainWrapper.create(rows.iterator(), execCxt) ; |
| } |
| |
| @Override |
| public void closeTable() { |
| // Don't release rows - the same TableN object may be used in multiple places. |
| } |
| |
| @Override |
| public List<String> getVarNames() { |
| return Var.varNames(vars) ; |
| } |
| |
| @Override |
| public List<Var> getVars() { |
| return vars ; |
| } |
| } |