/*
    * EL4J, the Extension Library for the J2EE, adds incremental enhancements to
    * the spring framework, http://el4j.sf.net
    * Copyright (C) 2005 by ELCA Informatique SA, Av. de la Harpe 22-24,
    * 1000 Lausanne, Switzerland, http://www.elca.ch
    *
    * EL4J is published under the GNU Lesser General Public License (LGPL)
    * Version 2.1. See http://www.gnu.org/licenses/
    *
   * 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.
   *
   * For alternative licensing, please contact info@elca.ch
   */
  package com.silvermindsoftware.hitch.validation.response;
  
  import java.awt.Color;
  import java.awt.Component;
  
  import javax.swing.DefaultListCellRenderer;
  import javax.swing.JList;
  
  import org.jdesktop.swingbinding.validation.ValidationCapability;
  
  import com.silvermindsoftware.hitch.binding.PropertyUtil;
  
  import ch.elca.el4j.services.gui.swing.GUIApplication;
  
  /**
   * A validating cell renderer for comboboxes.
   *
   * @svnLink $Revision: 3874 $;$Date: 2009-08-04 14:25:40 +0200 (Di, 04. Aug 2009) $;$Author: swismer $;$URL: https://el4j.svn.sourceforge.net/svnroot/el4j/branches/el4j_3_1/el4j/framework/modules/swing/src/main/java/com/silvermindsoftware/hitch/validation/response/DefaultValidatingComboBoxRenderer.java $
   *
   * @author Stefan Wismer (SWI)
   */
  public class DefaultValidatingComboBoxRenderer
  	extends DefaultListCellRenderer implements ComboBoxRenderer {
  	
  	/**
  	 * Color to mark value as invalid.
  	 */
  	protected final Color m_invalidColor;
  	
  	/**
  	 * The property to render.
  	 */
  	protected String m_property;
  	
  	/**
  	 * Should invalid property values marked with different color?
  	 */
  	protected boolean m_validate;
  	
  	
  	/**
  	 * The default contructor reading the invalidColor from Spring config.
  	 */
  	public DefaultValidatingComboBoxRenderer() {
  		this(null, null, false);
  	}
  	
  	/**
  	 * @param property    the property to render
  	 * @param validate    validate property value?
  	 */
  	public DefaultValidatingComboBoxRenderer(String property,
  		boolean validate) {
  		this(null, property, validate);
  	}
  	
  	/**
  	 * @param color       the color to mark value as invalid
  	 * @param property    the property to render
  	 * @param validate    validate property value?
  	 */
  	public DefaultValidatingComboBoxRenderer(Color color, String property,
  		boolean validate) {
  		m_invalidColor = color;
  		m_property = property;
  		m_validate = validate;
  	}
  	
  	/** {@inheritDoc} */
  	public void setProperty(String property) {
  		m_property = property;
  	}
  	
  	/**
  	 * @param validate   validate property value?
  	 */
  	public void setValidate(boolean validate) {
  		m_validate = validate;
  	}
  	
  	/** {@inheritDoc} */
  	@Override
  	public Component getListCellRendererComponent(JList list,
 		Object value, int index, boolean isSelected, boolean cellHasFocus) {
 		
 		Component renderer;
 		if (m_property != null) {
 			Object propValue = PropertyUtil.create(m_property).getValue(value);
 			renderer = super.getListCellRendererComponent(list,
 					propValue, index, isSelected, cellHasFocus);
 			
 			if (m_validate) {
 				if (value instanceof ValidationCapability) {
 					ValidationCapability v = (ValidationCapability) value;
 					if (!v.isValid(m_property)) {
 						renderer.setBackground(getInvalidColor());
 					}
 				}
 			}
 		} else {
 			renderer = super.getListCellRendererComponent(list,
 				value, index, isSelected,
 				cellHasFocus);
 		}
 		
 		return renderer;
 	}
 	
 	/**
 	 * @return    the color to mark a value as invalid.
 	 */
 	private Color getInvalidColor() {
 		if (m_invalidColor != null) {
 			return m_invalidColor;
 		} else {
 			return (Color) GUIApplication.getInstance().getConfig()
 			.get("invalidColor");
 		}
 	}
 }