Text2CASExample.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.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.util.ToolRunner;
import org.apache.uima.analysis_engine.AnalysisEngineDescription;
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 org.dkpro.bigdata.io.hadoop.Text2CASInputFormat;

import static org.apache.uima.fit.factory.AnalysisEngineFactory.createEngineDescription;

/**
 * This example reads plain text files from the HDFS and processes
 * them using a pipeline
 *
 * When using a special input format, such as Text2CAS, do not use
 * buildCollectionReader, just use
 *
 * @author hpzorn@gmail.com
 *
 */
public class Text2CASExample
        extends DkproHadoopDriver
{

    @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);

    }

    public static void main(String[] args)
            throws Exception
    {
        Text2CASExample pipeline = new Text2CASExample();
        pipeline.setMapperClass(DkproMapper.class);
        pipeline.setReducerClass(DkproReducer.class);
        ToolRunner.run(new Configuration(), pipeline, args);
    }

    @Override
    public void configure(JobConf job)
    {
//        should be set from the command line as -Dmapreduce.job.queuename=xxxxx
//        job.set("mapreduce.job.queuename", "smalljob");
        /*
		 * Use Text2Cas InputFormat, read texts directly from h
		 */

        job.setInputFormat(Text2CASInputFormat.class);
    }

    @Override
    public Class getInputFormatClass()
    {
        // TODO Auto-generated method stub
        return null;
    }

}