SequenceFsEntryTextMapper.java

/*
   Copyright 2011 Basis Technology Corp.

   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 org.sleuthkit.hadoop.clustering;

import java.io.IOException;
import java.util.List;

import org.apache.hadoop.io.Text;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.lightboxtechnologies.spectrum.FsEntry;
import com.lightboxtechnologies.spectrum.ImmutableHexWritable;

import org.sleuthkit.hadoop.core.HBaseConstants;
import org.sleuthkit.hadoop.core.SKMapper;

/** A mapper which will write out files from the HBase table
 *  to a sequence file IFF
 *  they have a regex match from the previous grep search.
 */
public class SequenceFsEntryTextMapper
extends SKMapper<ImmutableHexWritable, FsEntry, Text, Text> {

    final Logger LOG = LoggerFactory.getLogger(SequenceFsEntryTextMapper.class);
    
    @Override
    public void map(ImmutableHexWritable key, FsEntry value, Context context)
    throws IOException, InterruptedException {

        String output = (String)value.get(HBaseConstants.EXTRACTED_TEXT);
        if (output != null) {
            @SuppressWarnings("unchecked")
            List<Object> grepResults = (List<Object>)value.get(HBaseConstants.GREP_RESULTS);
            if ((grepResults != null) && (grepResults.size() > 0)) {
                // There were grep results, so we are interested in this file.
                context.write(new Text(value.getPath() + value.getName()), new Text(output));
                context.getCounter(SequenceFsEntryText.WrittenDocumentCount.DOCUMENTS).increment(1);
            }
        }
    }
}