com.ibm.bi.dml.runtime.matrix.mapred.CSVAssignRowIDMapper.java Source code

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Here is the source code for com.ibm.bi.dml.runtime.matrix.mapred.CSVAssignRowIDMapper.java

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/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * 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.ibm.bi.dml.runtime.matrix.mapred;

import java.io.IOException;
import java.util.regex.Pattern;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.ByteWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.apache.wink.json4j.JSONException;

import com.ibm.bi.dml.runtime.DMLRuntimeException;
import com.ibm.bi.dml.runtime.DMLUnsupportedOperationException;
import com.ibm.bi.dml.runtime.instructions.mr.CSVReblockInstruction;
import com.ibm.bi.dml.runtime.matrix.CSVReblockMR;
import com.ibm.bi.dml.runtime.matrix.CSVReblockMR.OffsetCount;
import com.ibm.bi.dml.runtime.transform.TfUtils;

public class CSVAssignRowIDMapper extends MapReduceBase
        implements Mapper<LongWritable, Text, ByteWritable, OffsetCount> {

    private ByteWritable outKey = new ByteWritable();
    private long fileOffset = 0;
    private long num = 0;
    private boolean first = true;
    private OutputCollector<ByteWritable, OffsetCount> outCache = null;
    private String delim = " ";
    private boolean ignoreFirstLine = false;
    private boolean realFirstLine = false;
    private String filename = "";
    private boolean headerFile = false;

    // members relevant to transform
    TfUtils _agents = null;

    @Override
    public void map(LongWritable key, Text value, OutputCollector<ByteWritable, OffsetCount> out, Reporter report)
            throws IOException {
        if (first) {
            first = false;
            fileOffset = key.get();
            outCache = out;
        }

        if (key.get() == 0 && headerFile)//getting the number of colums
        {
            if (!ignoreFirstLine) {
                report.incrCounter(CSVReblockMR.NUM_COLS_IN_MATRIX, outKey.toString(),
                        value.toString().split(delim, -1).length);
                if (!omit(value.toString()))
                    num++;
            } else
                realFirstLine = true;
        } else {
            if (realFirstLine) {
                report.incrCounter(CSVReblockMR.NUM_COLS_IN_MATRIX, outKey.toString(),
                        value.toString().split(delim, -1).length);
                realFirstLine = false;
            }
            if (!omit(value.toString()))
                num++;
        }
    }

    @Override
    @SuppressWarnings("deprecation")
    public void configure(JobConf job) {
        byte thisIndex;
        try {
            //it doesn't make sense to have repeated file names in the input, since this is for reblock
            thisIndex = MRJobConfiguration.getInputMatrixIndexesInMapper(job).get(0);
            outKey.set(thisIndex);
            FileSystem fs = FileSystem.get(job);
            Path thisPath = new Path(job.get("map.input.file")).makeQualified(fs);
            filename = thisPath.toString();
            String[] strs = job.getStrings(CSVReblockMR.SMALLEST_FILE_NAME_PER_INPUT);
            Path headerPath = new Path(strs[thisIndex]).makeQualified(fs);
            if (headerPath.toString().equals(filename))
                headerFile = true;
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        try {
            CSVReblockInstruction[] reblockInstructions = MRJobConfiguration.getCSVReblockInstructions(job);
            for (CSVReblockInstruction ins : reblockInstructions) {
                if (ins.input == thisIndex) {
                    delim = Pattern.quote(ins.delim);
                    ignoreFirstLine = ins.hasHeader;
                    break;
                }
            }
        } catch (DMLUnsupportedOperationException e) {
            throw new RuntimeException(e);
        } catch (DMLRuntimeException e) {
            throw new RuntimeException(e);
        }

        // load properties relevant to transform
        try {
            boolean omit = job.getBoolean(MRJobConfiguration.TF_TRANSFORM, false);
            if (omit)
                _agents = new TfUtils(job, true);
        } catch (IOException e) {
            throw new RuntimeException(e);
        } catch (JSONException e) {
            throw new RuntimeException(e);
        }
    }

    private boolean omit(String line) {
        if (_agents == null)
            return false;

        return _agents.omit(line.split(delim, -1));
    }

    @Override
    public void close() throws IOException {
        outCache.collect(outKey, new OffsetCount(filename, fileOffset, num));
    }
}