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Add H2 read/write support for file formats such as ESRI shape file

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/**
 * H2GIS is a library that brings spatial support to the H2 Database Engine
 * .
 *
 * H2GIS is distributed under GPL 3 license. It is produced by CNRS
 * .
 *
 * H2GIS 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.
 *
 * H2GIS 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
 * H2GIS. If not, see .
 *
 * For more information, please consult: 
 * or contact directly: info_at_h2gis.org
 */
package org.h2gis.drivers.utility;

import java.io.File;
import java.io.FileNotFoundException;
import java.sql.SQLException;

/**
 * Some utilities
 * 
 * @author Erwan Bocher
 */
public class FileUtil {
    
    /**
     * Check if the file is well formatted regarding an extension prefix.
     * Check also if the file doesn't exist.
     * 
     * @param file
     * @param prefix
     * @return
     * @throws SQLException 
     * @throws java.io.FileNotFoundException 
     */
    public static boolean isFileImportable(File file, String prefix) throws SQLException, FileNotFoundException{
        if (isExtensionWellFormated(file, prefix)) {
            if (file.exists()) {
                return true;
            } else {
                throw new FileNotFoundException("The following file does not exists:\n" + file.getPath());
            }
        } else {
            throw new SQLException("Please use " + prefix + " extension.");
        }
    }
    
    /**
     * Check if the file has the good extension
     * @param file
     * @param prefix
     * @return 
     */
    public static boolean isExtensionWellFormated(File file, String prefix) {
        String path = file.getAbsolutePath();
        String extension = "";
        int i = path.lastIndexOf('.');
        if (i >= 0) {
            extension = path.substring(i + 1);
        }
        return extension.equalsIgnoreCase(prefix);
    }
}