com.datascience.hadoop.CsvHelper.java Source code

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Here is the source code for com.datascience.hadoop.CsvHelper.java

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/*
 * Copyright 2015 the original author or authors.
 *
 * 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.datascience.hadoop;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.*;
import org.apache.hadoop.util.ReflectionUtils;

import java.io.File;
import java.io.IOException;
import java.net.URL;

/**
 * CSV test helper.
 *
 * @author amareeshbasanapalli
 */
public class CsvHelper {

    public Configuration buildConfiguration(String delimiter, String skipHeader, String recordSeparator,
            String[] columns) {
        Configuration conf = new Configuration();
        conf.set("fs.default.name", "file:///");
        conf.set(CsvInputFormat.CSV_READER_DELIMITER, delimiter);
        conf.set(CsvInputFormat.CSV_READER_SKIP_HEADER, skipHeader);
        conf.set(CsvInputFormat.CSV_READER_RECORD_SEPARATOR, recordSeparator);
        conf.set(FileSystem.FS_DEFAULT_NAME_KEY, FileSystem.DEFAULT_FS);
        conf.setStrings(CsvInputFormat.CSV_READER_COLUMNS, columns);
        conf.set("io.compression.codecs",
                "org.apache.hadoop.io.compress.DefaultCodec,org.apache.hadoop.io.compress.GzipCodec,org.apache.hadoop.io.compress.BZip2Codec,org.apache.hadoop.io.compress.DeflateCodec,org.apache.hadoop.io.compress.SnappyCodec,org.apache.hadoop.io.compress.Lz4Codec");
        return conf;
    }

    public CsvInputFormat createCSVInputFormat(Configuration conf) {
        return ReflectionUtils.newInstance(CsvInputFormat.class, conf);
    }

    public File getFile(String path) {
        URL url = this.getClass().getResource(path);
        return new File(url.getFile());
    }

    public RecordReader createRecordReader(InputFormat format, InputSplit split, JobConf jobConf)
            throws IOException {
        Reporter reporter = Reporter.NULL;
        return format.getRecordReader(split, jobConf, reporter);
    }

    public FileSplit createFileSplit(Path path, long start, long end) {
        return new FileSplit(path, start, end, new String[0]);
    }

}