content: package com.japisoft.framework.spreadsheet;
  
  import java.io.File;
  import java.util.Map;
  
  /**
  This program is available under two licenses : 
  
  1. For non commercial usage : 
  
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  
  2. For commercial usage :
  
  You need to get a commercial license for source usage at : 
  
  http://www.editix.com/buy.html
  
  Copyright (c) 2018 Alexandre Brillant - JAPISOFT SARL - http://www.japisoft.com
  
  @author Alexandre Brillant - abrillant@japisoft.com
  @author JAPISOFT SARL - http://www.japisoft.com
  
  */
  public class SpreadsheetFactory {
  
  	private static SpreadsheetFactory INSTANCE = null;
  	private Map<String,Spreadsheet> model = null;
  
  	private SpreadsheetFactory() {
  	}
  
  	public static SpreadsheetFactory getInstance() {
  		if ( INSTANCE == null )
  			INSTANCE = new SpreadsheetFactory();
  		return INSTANCE;
  	}
  
  	public Spreadsheet getSpreadsheet( File fileName ) throws Exception {
  		String lastPart = fileName.getName().toLowerCase();
  		int i = lastPart.lastIndexOf( "." );
  		if ( i > -1 ) {
  			String ext = lastPart.substring( i + 1 );
  			
  			if ( "csv".equals( ext ) )
  				return new CsvSpreadsheet();
  			else
  			if ( "xls".equals( ext ) )
  				return new XlsSpreadsheet();
  			else
  			if ( "xlsx".equals( ext ) )
  				return new XlsxSpreadsheet();
  			else
  				throw new Exception( "Unknown file format" );			
  		} else {
  			throw new Exception( "Unknown file format" );
  		}
  	}
  
  }
  