/*
 *  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.github.sakserv.sequencefile;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Text;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

public class SequenceFileWriter {
    
    // Logger
    private static final Logger LOG = LoggerFactory.getLogger(SequenceFileWriter.class);
    
    public static void main(String[] args) {
        
        String outputFile = args[0];
        
        Configuration conf = new Configuration();
        try {
            FileSystem fs = FileSystem.get(conf);
            
            Path seqFilePath = new Path(outputFile);
            fs.mkdirs(seqFilePath.getParent());

            SequenceFile.Writer writer = SequenceFile.createWriter(conf,
                    SequenceFile.Writer.file(seqFilePath), SequenceFile.Writer.keyClass(Text.class),
                    SequenceFile.Writer.valueClass(IntWritable.class));

            writer.append(new Text("key1"), new IntWritable(1));
            writer.append(new Text("key2"), new IntWritable(2));

            writer.close();
            
            LOG.info("SUCCESS: Successfully wrote " + seqFilePath + " to HDFS.");
        } catch(IOException e) {
            LOG.error("ERROR: Could not load hadoop configuration");
            e.printStackTrace();
        }
        
    }
}