/*
* Copyright 2010-2013 10gen Inc.
*
* Licensed 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 com.mongodb.hadoop;
// Mongo
import com.mongodb.hadoop.input.MongoInputSplit;
import com.mongodb.hadoop.splitter.MongoSplitter;
import com.mongodb.hadoop.splitter.MongoSplitterFactory;
import com.mongodb.hadoop.splitter.SplitFailedException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.bson.BSONObject;
import java.io.IOException;
import java.util.List;
public class MongoInputFormat extends InputFormat<Object, BSONObject> {
private static final Log LOG = LogFactory.getLog(MongoInputFormat.class);
@Override
public RecordReader<Object, BSONObject> createRecordReader(final InputSplit split, final TaskAttemptContext context) {
if (!(split instanceof MongoInputSplit)) {
throw new IllegalStateException("Creation of a new RecordReader requires a MongoInputSplit instance.");
}
final MongoInputSplit mis = (MongoInputSplit) split;
return new com.mongodb.hadoop.input.MongoRecordReader(mis);
}
@Override
public List<InputSplit> getSplits(final JobContext context) throws IOException {
final Configuration conf = context.getConfiguration();
try {
MongoSplitter splitterImpl = MongoSplitterFactory.getSplitter(conf);
if (LOG.isDebugEnabled()) {
LOG.debug("Using " + splitterImpl.toString() + " to calculate splits.");
}
return splitterImpl.calculateSplits();
} catch (SplitFailedException spfe) {
throw new IOException(spfe);
}
}
public boolean verifyConfiguration(final Configuration conf) {
return true;
}
}