/**
 * ===========================================
 * LibLayout : a free Java layouting library
 * ===========================================
 *
 * Project Info:  http://reporting.pentaho.org/liblayout/
 *
 * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
 *
 * 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.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ------------
 * $Id: FontConverter.java 6653 2008-12-02 14:53:40Z tmorgner $
 * ------------
 * (C) Copyright 2006-2007, by Pentaho Corporation.
 */
package org.jfree.layouting.input.swing.converter;

import javax.swing.text.Element;
import javax.swing.text.StyleConstants;

import org.jfree.layouting.input.style.keys.font.FontStyle;
import org.jfree.layouting.input.style.keys.font.FontStyleKeys;
import org.jfree.layouting.input.style.keys.font.FontWeight;
import org.jfree.layouting.input.swing.Converter;
import org.jfree.layouting.input.swing.ConverterAttributeSet;
import org.pentaho.reporting.libraries.base.util.DebugLog;

/**
 * This class handles convertions of font style attributes to css style attributes.
 */
public class FontConverter implements Converter
{
  public FontConverter()
  {
  }

  /**
   * Converts a style key and a style value to a CSS compatible style key and style value. A conversion can result in
   * more than one key and value.
   *
   * @param key     The style key to convert.
   * @param value   The style value to convert.
   * @param cssAttr The current converted CSS attributes for the current element.
   * @param context The current Element.
   * @return The conversion result or null if no converstion has been done.
   */
  public ConverterAttributeSet convertToCSS(final Object key,
                                            final Object value,
                                            final ConverterAttributeSet cssAttr,
                                            final Element context)
  {
    if (key instanceof StyleConstants.FontConstants)
    {
      final StyleConstants.FontConstants fontConstant = (StyleConstants.FontConstants) key;
      return handleFontConstants(fontConstant, value);
    }

    return null;
  }

  /**
   * Handles the convertions of <code>(StyleConstants.FontConstants</code> key type.
   *
   * @param fontConstant The style key.
   * @param value        The style value.
   * @return The conversion result or null if no converstion has been done.
   */
  protected ConverterAttributeSet handleFontConstants(final StyleConstants.FontConstants fontConstant,
                                                      final Object value)
  {
    final ConverterAttributeSet attr = new ConverterAttributeSet();

    if (fontConstant == StyleConstants.FontFamily)
    {
      // just attribute name conversion
      attr.addAttribute(FontStyleKeys.FONT_FAMILY.getName(), value);

    }
    else if (fontConstant == StyleConstants.FontSize)
    {
      // just attribute name conversion
      attr.addAttribute(FontStyleKeys.FONT_SIZE.getName(), value);
    }
    else if (fontConstant == StyleConstants.Bold)
    {
      final Boolean b = (Boolean) value;
      if (Boolean.TRUE.equals(b))
      {
        attr.addAttribute(FontStyleKeys.FONT_WEIGHT.getName(), FontWeight.BOLD);
      }
      else
      {
        attr.addAttribute(FontStyleKeys.FONT_WEIGHT.getName(), FontWeight.NORMAL);
      }
    }
    else if (fontConstant == StyleConstants.Italic)
    {
      final Boolean b = (Boolean) value;
      if (Boolean.TRUE.equals(b))
      {
        attr.addAttribute(FontStyleKeys.FONT_STYLE.getName(), FontStyle.ITALIC);
      }
      else
      {
        attr.addAttribute(FontStyleKeys.FONT_STYLE.getName(), FontStyle.NORMAL);
      }
    }
    else
    {
      DebugLog.log("Unkown type of font attribute: " + fontConstant);
      return null;
    }

    return attr;
  }

}
