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/*
 * 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.hyracks.dataflow.hadoop.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.Serializable;

import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.util.ReflectionUtils;

public class InputSplitsProxy implements Serializable {
    private static final long serialVersionUID = 1L;

    private final Class[] isClasses;
    private final byte[] bytes;

    public InputSplitsProxy(JobConf conf, Object[] inputSplits) throws IOException {
        isClasses = new Class[inputSplits.length];
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);
        if (conf.getUseNewMapper()) {
            for (int i = 0; i < inputSplits.length; ++i) {
                isClasses[i] = ((org.apache.hadoop.mapreduce.InputSplit) inputSplits[i]).getClass();
                ((Writable) inputSplits[i]).write(dos);
            }
        } else {
            for (int i = 0; i < inputSplits.length; ++i) {
                isClasses[i] = ((org.apache.hadoop.mapred.InputSplit) inputSplits[i]).getClass();
                ((Writable) inputSplits[i]).write(dos);
            }
        }
        dos.close();
        bytes = baos.toByteArray();

    }

    public Object[] toInputSplits(JobConf jobConf) throws InstantiationException, IllegalAccessException, IOException {
        Object[] splits = new Object[isClasses.length];
        DataInputStream dis = new DataInputStream(new ByteArrayInputStream(bytes));
        for (int i = 0; i < splits.length; ++i) {
            splits[i] = ReflectionUtils.newInstance(isClasses[i], jobConf);
            if (jobConf.getUseNewMapper()) {
                ((Writable) splits[i]).readFields(dis);
            } else {
                ((Writable) splits[i]).readFields(dis);
            }
        }
        return splits;
    }
}