/*
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 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 Lesser General Public License for more details.
 *
 * Copyright (c) 2001 - 2013 Object Refinery Ltd, Pentaho Corporation and Contributors..  All rights reserved.
 */

package org.pentaho.reporting.engine.classic.core.util.beans;

/**
 * A class that handles the conversion of {@link Byte} attributes to and from their {@link String} representation.
 *
 * @author Thomas Morgner
 */
public class ByteValueConverter implements ValueConverter {

  /**
   * Creates a new value converter.
   */
  public ByteValueConverter() {
  }

  /**
   * Converts the attribute to a string.
   *
   * @param o
   *          the attribute ({@link Byte} expected).
   * @return A string representing the {@link Byte} value.
   */
  public String toAttributeValue( final Object o ) throws BeanException {
    if ( o == null ) {
      throw new NullPointerException();
    }
    if ( o instanceof Byte ) {
      return o.toString();
    }
    throw new BeanException( "Failed to convert unknown object: " + o );
  }

  /**
   * Converts a string to a {@link Byte}.
   *
   * @param s
   *          the string.
   * @return a {@link Byte}.
   */
  public Object toPropertyValue( final String s ) throws BeanException {
    if ( s == null ) {
      throw new NullPointerException();
    }
    final String val = s.trim();
    if ( val.length() == 0 ) {
      throw BeanException.getInstance( "Failed to convert empty string to number", null );
    }

    try {
      return new Byte( val );
    } catch ( NumberFormatException be ) {
      throw BeanException.getInstance( "Failed to parse number", be );
    }
  }
}
