| /** |
| * 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.hadoop.sqoop.testutil; |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.SequenceFile; |
| import org.apache.hadoop.io.SequenceFile.Reader; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| /** |
| * Utility class to help with test cases. Just reads the first (k, v) pair |
| * from a SequenceFile and returns the value part. |
| * |
| * |
| */ |
| public final class SeqFileReader { |
| |
| public static final Log LOG = LogFactory.getLog(SeqFileReader.class.getName()); |
| |
| public static Reader getSeqFileReader(String filename) throws IOException { |
| // read from local filesystem |
| Configuration conf = new Configuration(); |
| conf.set("fs.default.name", "file:///"); |
| FileSystem fs = FileSystem.get(conf); |
| LOG.info("Opening SequenceFile " + filename); |
| return new SequenceFile.Reader(fs, new Path(filename), conf); |
| } |
| |
| public static Object getFirstValue(String filename) throws IOException { |
| Reader r = null; |
| try { |
| // read from local filesystem |
| Configuration conf = new Configuration(); |
| conf.set("fs.default.name", "file:///"); |
| FileSystem fs = FileSystem.get(conf); |
| r = new SequenceFile.Reader(fs, new Path(filename), conf); |
| Object key = ReflectionUtils.newInstance(r.getKeyClass(), conf); |
| Object val = ReflectionUtils.newInstance(r.getValueClass(), conf); |
| LOG.info("Reading value of type " + r.getValueClassName() |
| + " from SequenceFile " + filename); |
| r.next(key); |
| r.getCurrentValue(val); |
| LOG.info("Value as string: " + val.toString()); |
| return val; |
| } finally { |
| if (null != r) { |
| try { |
| r.close(); |
| } catch (IOException ioe) { |
| LOG.warn("IOException during close: " + ioe.toString()); |
| } |
| } |
| } |
| } |
| } |
| |