/**
* Copyright 2012 - CommonCrawl Foundation
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
**/
package org.commoncrawl.mapred.pipelineV3;
import java.io.IOException;
import java.util.regex.Pattern;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapRunner;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.Reporter;
import org.commoncrawl.util.TextBytes;
/**
*
* @author rana
*
*/
public class RegExFilter extends
MapRunner<TextBytes, TextBytes, TextBytes, TextBytes> {
public static final String REGEX_KEY = "REG-EX-EXP";
Pattern pattern = null;
String inputFile = null;
long inputFilePos = 0;
@Override
public void configure(JobConf job) {
super.configure(job);
String regEx = job.get(REGEX_KEY);
pattern = Pattern.compile(regEx);
inputFile = job.get("map.input.file");
inputFilePos = job.getLong("map.input.start", -1L);
}
@Override
public void run(RecordReader<TextBytes, TextBytes> input,
OutputCollector<TextBytes, TextBytes> output, Reporter reporter)
throws IOException {
try {
// allocate key & value instances that are re-used for all entries
TextBytes key = input.createKey();
TextBytes value = input.createValue();
while (input.next(key, value)) {
String url = key.toString();
if (pattern.matcher(url).matches()) {
output.collect(new TextBytes("Key:" + key), value);
}
}
} finally {
}
}
}