| /* |
| * 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.rya.indexing.pcj.storage.accumulo; |
| |
| import java.util.Iterator; |
| import java.util.Map.Entry; |
| |
| import org.apache.accumulo.core.client.Scanner; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.fluo.api.data.Bytes; |
| import org.apache.rya.api.utils.CloseableIterator; |
| import org.apache.rya.indexing.pcj.storage.PeriodicQueryResultStorage; |
| import org.openrdf.query.BindingSet; |
| |
| /** |
| * Implementation of CloseableIterator for retrieving results from a {@link PeriodicQueryResultStorage} |
| * table. |
| */ |
| public class AccumuloValueBindingSetIterator implements CloseableIterator<BindingSet>{ |
| |
| private final Scanner scanner; |
| private final Iterator<Entry<Key, Value>> iter; |
| private final VisibilityBindingSetSerDe bsSerDe = new VisibilityBindingSetSerDe(); |
| |
| public AccumuloValueBindingSetIterator(Scanner scanner) { |
| this.scanner = scanner; |
| iter = scanner.iterator(); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return iter.hasNext(); |
| } |
| |
| @Override |
| public BindingSet next() { |
| try { |
| return bsSerDe.deserialize(Bytes.of(iter.next().getValue().get())).getBindingSet(); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| @Override |
| public void close() { |
| scanner.close(); |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |