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Java example source code file (FileRecordReaderFactory.java)

This example Java source code file (FileRecordReaderFactory.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

csvrecordreader, filerecordreaderfactory, filesplit, inputsplit, matlabrecordreader, net, network, override, recordreader, runtimeexception, string, svmlightrecordreader, unknownformatexception, uri

The FileRecordReaderFactory.java Java example source code

/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    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.deeplearning4j.cli.files;

import com.google.common.base.Preconditions;
import org.apache.commons.io.FilenameUtils;
import org.canova.api.exceptions.UnknownFormatException;
import org.canova.api.records.reader.RecordReader;
import org.canova.api.records.reader.factory.RecordReaderFactory;
import org.canova.api.records.reader.impl.CSVRecordReader;
import org.canova.api.records.reader.impl.FileRecordReader;
import org.canova.api.records.reader.impl.MatlabRecordReader;
import org.canova.api.records.reader.impl.SVMLightRecordReader;
import org.canova.api.split.FileSplit;
import org.canova.api.split.InputSplit;

import java.io.File;
import java.net.URI;

/**
 * Creates an instance of file record reader
 *
 * @author sonali
 */
public class FileRecordReaderFactory implements RecordReaderFactory {
  /**
   * Creates new RecordReader instance based on the input file extension
   *
   * @param uri location of input data
   * @return RecordReader instance
   * @throws UnknownFormatException
   */

  @Override
  public RecordReader create(URI uri) throws UnknownFormatException {
    Preconditions.checkArgument(uri != null, "URI cannot be null");
    File file = new File(uri.toString());
    InputSplit split = new FileSplit(file);

    String fileNameExtension = FilenameUtils.getExtension(uri.toString()).toLowerCase();
    RecordReader ret = null;
    switch (fileNameExtension) {
      case "csv":
        ret = new CSVRecordReader();
        break;
      case "txt":
        ret = new FileRecordReader();
        break;
      case "mat":
        ret = new MatlabRecordReader();
        break;
      case "svmlight":
        ret = new SVMLightRecordReader();
        break;
      default:
        throw new UnknownFormatException("Unknown file format");
    }

    try {
      ret.initialize(split);
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
    return ret;

  }


}

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