com.mongodb.hadoop.input.BSONFileSplit Maven / Gradle / Ivy

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The MongoDB Connector for Hadoop is a plugin for Hadoop that provides the ability to use MongoDB as an input source and/or an output destination.

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package com.mongodb.hadoop.input;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

public class BSONFileSplit extends FileSplit {

    // CHECKSTYLE:OFF
    protected String keyField = "_id";
    // CHECKSTYLE:ON

    public BSONFileSplit(final Path file, final long start, final long length,
                         final String[] hosts) {
        super(file, start, length, hosts);
    }

    public BSONFileSplit() { this(null, 0, 0, null); }

    public String getKeyField() {
        return keyField;
    }

    public void setKeyField(final String keyField) {
        this.keyField = keyField;
    }

    @Override
    public void write(final DataOutput out) throws IOException {
        super.write(out);
        Text.writeString(out, getKeyField());
    }

    @Override
    public void readFields(final DataInput in) throws IOException {
        super.readFields(in);
        setKeyField(Text.readString(in));
    }
}