edu.umd.cloud9.collection.wikipedia.EnglishWikipediaPageInputFormat1.java Source code

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Here is the source code for edu.umd.cloud9.collection.wikipedia.EnglishWikipediaPageInputFormat1.java

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/*
 * Cloud9: A MapReduce Library for Hadoop
 *  
 * 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 edu.umd.cloud9.collection.wikipedia;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;

import edu.umd.cloud9.collection.IndexableFileInputFormat;
import edu.umd.cloud9.collection.XMLInputFormat;
import edu.umd.cloud9.collection.XMLInputFormat.XMLRecordReader;
import edu.umd.cloud9.collection.wikipedia.language.EnglishWikipediaPage;

/**
 * Adapted Wikipedia input format with new MapReduce API support
 * @author tuan
 *
 */
@Deprecated
public class EnglishWikipediaPageInputFormat1 extends IndexableFileInputFormat<LongWritable, WikipediaPage> {

    @Override
    public RecordReader<LongWritable, WikipediaPage> createRecordReader(InputSplit split,
            TaskAttemptContext context) throws IOException, InterruptedException {
        context.setStatus(split.toString());
        WikipediaPageRecordReader reader = new WikipediaPageRecordReader();
        reader.initialize(split, context);
        return reader;
    }

    public static class WikipediaPageRecordReader extends RecordReader<LongWritable, WikipediaPage> {

        private final XMLRecordReader reader = new XMLRecordReader();
        private final WikipediaPage page = new EnglishWikipediaPage();

        public WikipediaPageRecordReader() {
        }

        @Override
        public void initialize(InputSplit split, TaskAttemptContext context)
                throws IOException, InterruptedException {
            Configuration conf = context.getConfiguration();
            conf.set(XMLInputFormat.START_TAG_KEY, WikipediaPage.XML_START_TAG);
            conf.set(XMLInputFormat.END_TAG_KEY, WikipediaPage.XML_END_TAG);
            reader.initialize(split, context);
        }

        @Override
        public boolean nextKeyValue() throws IOException, InterruptedException {
            return reader.nextKeyValue();
        }

        @Override
        public LongWritable getCurrentKey() throws IOException, InterruptedException {
            return reader.getCurrentKey();
        }

        @Override
        public WikipediaPage getCurrentValue() throws IOException, InterruptedException {
            WikipediaPage.readPage(page, reader.getCurrentValue().toString());
            return page;
        }

        @Override
        public float getProgress() throws IOException, InterruptedException {
            return reader.getProgress();
        }

        @Override
        public void close() throws IOException {
            reader.close();
        }
    }
}