/*
* Copyright 2013 Cloudera 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 org.kitesdk.data.spi.filesystem;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
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.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;
import org.kitesdk.compat.Hadoop;
import org.kitesdk.data.DatasetDescriptor;
import org.kitesdk.data.DatasetOperationException;
import org.kitesdk.data.View;
import org.kitesdk.data.spi.AbstractRefinableView;
import org.kitesdk.data.spi.DataModelUtil;
import org.kitesdk.data.spi.EntityAccessor;
class CSVInputFormat<E> extends FileInputFormat<E, Void> {
private DatasetDescriptor descriptor = null;
private EntityAccessor<E> accessor = null;
public void setView(View<E> view) {
this.descriptor = view.getDataset().getDescriptor();
this.accessor = DataModelUtil.accessor(view.getType(), view.getSchema());
}
@Override
protected boolean isSplitable(JobContext context, Path filename) {
return false;
}
@Override
public List<InputSplit> getSplits(JobContext job) throws IOException {
return super.getSplits(job);
}
@Override
public RecordReader<E, Void> createRecordReader(InputSplit split,
TaskAttemptContext context)
throws IOException, InterruptedException {
Configuration conf = Hadoop.TaskAttemptContext
.getConfiguration.invoke(context);
Path path;
if (split instanceof FileSplit) {
path = ((FileSplit) split).getPath();
} else {
throw new DatasetOperationException(
"Split is not a FileSplit: %s:%s",
split.getClass().getCanonicalName(), split);
}
CSVFileReader<E> reader = new CSVFileReader<E>(
path.getFileSystem(conf), path, descriptor, accessor);
reader.initialize();
return reader.asRecordReader();
}
}