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Java example source code file (FileRecordWriterFactory.java)

This example Java source code file (FileRecordWriterFactory.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.

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Java - Java tags/keywords

csvrecordwriter, filerecordwriter, filerecordwriterfactory, matlabrecordwriter, net, network, override, recordwriter, string, svmlightrecordwriter, unknown, unknownformatexception, uri

The FileRecordWriterFactory.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.factory.RecordWriterFactory;
import org.canova.api.records.writer.RecordWriter;
import org.canova.api.records.writer.impl.CSVRecordWriter;
import org.canova.api.records.writer.impl.FileRecordWriter;
import org.canova.api.records.writer.impl.MatlabRecordWriter;
import org.canova.api.records.writer.impl.SVMLightRecordWriter;

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

 * Creates an instance of a file record writer
 * @author sonali
public class FileRecordWriterFactory implements RecordWriterFactory {
   * Creates new RecordWriter instance based on the output file extension
   * @param uri destination for saving model
   * @return RecordWriter instance
   * @throws Exception

  public RecordWriter create(URI uri) throws Exception {
    Preconditions.checkArgument(uri != null, "URI needs to be specified");
    File out = new File(uri.toString());
    String fileNameExtension = FilenameUtils.getExtension(uri.toString()).toLowerCase();
    RecordWriter recordWriter;

    switch (fileNameExtension) {
      case "csv":
        recordWriter = new CSVRecordWriter(out);
      case "txt":
        recordWriter = new FileRecordWriter(out, true);
      case "mat":
        recordWriter = new MatlabRecordWriter(out);
      case "svmlight":
        recordWriter = new SVMLightRecordWriter(out, true);
        throw new UnknownFormatException("Unknown file format");

    return recordWriter;


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