/**
 * 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.hcatalog.utils;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.Iterator;
import java.util.List;

import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hcatalog.data.HCatRecord;
import org.apache.hcatalog.data.transfer.DataTransferFactory;
import org.apache.hcatalog.data.transfer.HCatReader;
import org.apache.hcatalog.data.transfer.ReaderContext;

public class DataReaderSlave {

    public static void main(String[] args) throws IOException, ClassNotFoundException {

        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(new File(args[0])));
        ReaderContext cntxt = (ReaderContext) ois.readObject();
        ois.close();

        String[] inpSlitsToRead = args[1].split(",");
        List<InputSplit> splits = cntxt.getSplits();

        for (int i = 0; i < inpSlitsToRead.length; i++) {
            InputSplit split = splits.get(Integer.parseInt(inpSlitsToRead[i]));
            HCatReader reader = DataTransferFactory.getHCatReader(split, cntxt.getConf());
            Iterator<HCatRecord> itr = reader.read();
            File f = new File(args[2] + "-" + i);
            f.delete();
            BufferedWriter outFile = new BufferedWriter(new FileWriter(f));
            while (itr.hasNext()) {
                String rec = itr.next().toString().replaceFirst("\\s+$", "");
                System.err.println(rec);
                outFile.write(rec + "\n");
            }
            outFile.close();
        }
    }
}