UimaPipelineOnHadoop.java

/*******************************************************************************
 * Copyright 2013
 * Ubiquitous Knowledge Processing (UKP) Lab
 * Technische Universität Darmstadt
 * 
 * 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.dkpro.bigdata.examples;

import de.tudarmstadt.ukp.dkpro.core.io.text.TextReader;
import de.tudarmstadt.ukp.dkpro.core.snowball.SnowballStemmer;
import de.tudarmstadt.ukp.dkpro.core.tokit.BreakIteratorSegmenter;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.SequenceFileInputFormat;
import org.apache.hadoop.util.ToolRunner;
import org.apache.uima.analysis_engine.AnalysisEngineDescription;
import org.apache.uima.collection.CollectionReader;
import org.apache.uima.resource.ResourceInitializationException;
import org.dkpro.bigdata.hadoop.DkproHadoopDriver;
import org.dkpro.bigdata.hadoop.DkproMapper;
import org.dkpro.bigdata.hadoop.DkproReducer;

import static de.tudarmstadt.ukp.dkpro.core.api.io.ResourceCollectionReaderBase.INCLUDE_PREFIX;
import static org.apache.uima.fit.factory.AnalysisEngineFactory.createEngineDescription;
import static org.apache.uima.fit.factory.CollectionReaderFactory.createReader;

public class UimaPipelineOnHadoop
        extends DkproHadoopDriver
{
    @Override
    public CollectionReader buildCollectionReader()
            throws ResourceInitializationException
    {

        return createReader(TextReader.class, TextReader.PARAM_SOURCE_LOCATION,
                "src/test/resources/text",
                TextReader.PARAM_PATTERNS, new String[] { INCLUDE_PREFIX + "*.txt" },
                TextReader.PARAM_LANGUAGE, "en");

    }

    @Override
    public AnalysisEngineDescription buildMapperEngine(Configuration job)
            throws ResourceInitializationException
    {

        AnalysisEngineDescription tokenizer = createEngineDescription(BreakIteratorSegmenter.class);

        AnalysisEngineDescription stemmer = createEngineDescription(SnowballStemmer.class,
                SnowballStemmer.PARAM_LANGUAGE, "en");
        return createEngineDescription(tokenizer, stemmer);

    }

    @Override
    public AnalysisEngineDescription buildReducerEngine(Configuration job)
            throws ResourceInitializationException
    {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Class getInputFormatClass()
    {
        return SequenceFileInputFormat.class;
    }

    @Override
    public void configure(JobConf job)
    {

    }

    public static void main(String[] args)
    {

        try {
            UimaPipelineOnHadoop pipeline = new UimaPipelineOnHadoop();
            pipeline.setMapperClass(DkproMapper.class);
            pipeline.setReducerClass(DkproReducer.class);

            ToolRunner.run(new Configuration(), pipeline, args);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

}