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SchemaCrawler is an open-source Java API that makes working with database metadata as easy as working with plain old Java objects. SchemaCrawler is also a database schema discovery and comprehension, and schema documentation tool. You can search for database schema objects using regular expressions, and output the schema and data in a readable text format. The output is designed to be diff-ed against other database schemas.

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/*
 * SchemaCrawler
 * http://sourceforge.net/projects/schemacrawler
 * Copyright (c) 2000-2014, Sualeh Fatehi.
 * This library is free software; you can redistribute it and/or modify it under
 * the terms
 * of the GNU Lesser General Public License as published by the Free Software
 * Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 * This library 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 Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public License
 * along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 */

package sf.util.clparser;


import java.text.NumberFormat;
import java.text.ParseException;

/**
 * An option that expects a floating-point value.
 */
public final class NumberOption
  extends BaseOption
{

  public NumberOption(final Character shortForm, final Number defaultValue)
  {
    super(shortForm, defaultValue);
  }

  public NumberOption(final Character shortForm,
                      final String longForm,
                      final Number defaultValue)
  {
    super(shortForm, longForm, defaultValue);
  }

  public NumberOption(final String longForm, final Number defaultValue)
  {
    super(longForm, defaultValue);
  }

  @Override
  protected OptionValue parseValue(final String arg)
  {
    try
    {
      final Number number = NumberFormat.getNumberInstance().parse(arg);
      return new OptionValue<>(this, number);
    }
    catch (final ParseException e)
    {
      return null;
    }
    catch (final NullPointerException e)
    {
      return null;
    }
  }
}