| /** |
| * 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.gora.avro.query; |
| |
| import java.io.EOFException; |
| import java.io.IOException; |
| |
| import org.apache.avro.AvroTypeException; |
| import org.apache.avro.io.DatumReader; |
| import org.apache.avro.io.Decoder; |
| import org.apache.gora.avro.store.AvroStore; |
| import org.apache.gora.persistency.Persistent; |
| import org.apache.gora.query.impl.ResultBase; |
| |
| /** |
| * Adapter to convert DatumReader to Result. |
| */ |
| public class AvroResult<K, T extends Persistent> extends ResultBase<K, T> { |
| |
| private DatumReader<T> reader; |
| private Decoder decoder; |
| |
| public AvroResult(AvroStore<K,T> dataStore, AvroQuery<K,T> query |
| , DatumReader<T> reader, Decoder decoder) { |
| super(dataStore, query); |
| this.reader = reader; |
| this.decoder = decoder; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| } |
| |
| @Override |
| public float getProgress() throws IOException { |
| //TODO: FIXME |
| return 0; |
| } |
| |
| @Override |
| public boolean nextInner() throws IOException { |
| try { |
| persistent = reader.read(persistent, decoder); |
| |
| } catch (AvroTypeException ex) { |
| //TODO: it seems that avro does not respect end-of file and return null |
| //gracefully. Report the issue. |
| return false; |
| } catch (EOFException ex) { |
| return false; |
| } |
| |
| return persistent != null; |
| } |
| } |