fire.util.fileformats.pdf.PdfRecordReader.java Source code

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Here is the source code for fire.util.fileformats.pdf.PdfRecordReader.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 fire.util.fileformats.pdf;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.util.PDFTextStripper;

public class PdfRecordReader extends RecordReader<Text, Text> {

    private FileSplit fileSplit;
    private Configuration conf;
    private Text key = null;
    private Text value = null;
    private boolean processed = false;

    @Override
    public void initialize(InputSplit split, TaskAttemptContext context) throws IOException, InterruptedException {

        this.fileSplit = (FileSplit) split;
        this.conf = context.getConfiguration();

    }

    //   InputSplit split = context.getInputSplit();
    //   Path path = ((FileSplit) split).getPath();
    //   filenameKey = new Text(path.toString());

    //Here it reads a pdf files, extracts the contents of it and creates a Text object of the content and returns
    //key=filename
    //value= text content of the pdf file
    @Override
    public boolean nextKeyValue() throws IOException, InterruptedException {

        if (!processed) {
            Path file = fileSplit.getPath();
            FileSystem fs = file.getFileSystem(conf);
            FSDataInputStream in = null;
            PDDocument pdf = null;
            String parsedText = null;
            PDFTextStripper stripper;
            try {
                in = fs.open(file);
                pdf = PDDocument.load(in);
                stripper = new PDFTextStripper();
                parsedText = stripper.getText(pdf);
                this.key = new Text(file.getName());
                this.value = new Text(parsedText);
            } finally {
                IOUtils.closeStream(in);
            }
            processed = true;
            return true;
        }
        return false;
    }

    @Override
    public Text getCurrentKey() throws IOException, InterruptedException {

        return key;
    }

    @Override
    public Text getCurrentValue() throws IOException, InterruptedException {

        return value;
    }

    @Override
    public float getProgress() throws IOException, InterruptedException {

        return processed ? 1.0f : 0.0f;
    }

    @Override
    public void close() throws IOException {

    }

}