package org.andromda.cartridges.jsf.utils;
   
   import java.lang.reflect.Method;
   import javax.faces.component.UICommand;
   import javax.faces.component.UIComponent;
   import javax.faces.component.UIGraphic;
   import javax.faces.component.UIParameter;
   import javax.faces.component.UISelectBoolean;
   import javax.faces.component.ValueHolder;
  import javax.faces.context.FacesContext;
  import javax.faces.el.ValueBinding;
  import javax.faces.webapp.UIComponentTag;
  import org.apache.commons.lang.ObjectUtils;
  
  /**
   * Utilities for dealing with the JSF components.
   *
   * @author Chad Brandon
   */
  public class ComponentUtils
  {
      /**
       * Sets the value property of a component.
       *
       * @param context the current faces context.
       * @param component the component.
       * @param value the value to set.
       */
      public static void setValueProperty(
          final FacesContext context,
          final UIComponent component,
          final String value)
      {
          if (value != null)
          {
              if (UIComponentTag.isValueReference(value))
              {
                  final ValueBinding binding = context.getApplication().createValueBinding(value);
                  component.setValueBinding(
                      "value",
                      binding);
              }
              else if (component instanceof UICommand)
              {
                  ((UICommand)component).setValue(value);
              }
              else if (component instanceof UIParameter)
              {
                  ((UIParameter)component).setValue(value);
              }
              else if (component instanceof UISelectBoolean)
              {
                  ((UISelectBoolean)component).setValue(Boolean.valueOf(value));
              }
              else if (component instanceof UIGraphic)
              {
                  ((UIGraphic)component).setValue(value);
              }
              else if (component instanceof ValueHolder)
              {
                  ((ValueHolder)component).setValue(value);
              }
          }
      }
  
      /**
       * Sets the property with the given <code>name</code> of a component.
       * @param name the name of the component to set.
       * @param context the current faces context.
       * @param component the component.
       * @param value the value to set.
       */
      public static void setStringProperty(
          final String name,
          final FacesContext context,
          final UIComponent component,
          final String value)
      {
          if (value != null)
          {
              if (UIComponentTag.isValueReference(value))
              {
                  final ValueBinding binding = context.getApplication().createValueBinding(value);
                  component.setValueBinding(
                      name,
                      binding);
              }
              else
              {
                  component.getAttributes().put(name, value);
              }
          }
      }
  
      /**
       * Sets the boolean value of property with the given <code>name</code> of a component.
       * @param name the name of the component to set.
       * @param context the current faces context.
       * @param component the component.
      * @param value the value to set.
      */
     public static void setBooleanProperty(
         final String name,
         final FacesContext context,
         final UIComponent component,
         final String value)
     {
         if (value != null)
         {
             if (UIComponentTag.isValueReference(value))
             {
                 final ValueBinding binding = context.getApplication().createValueBinding(value);
                 component.setValueBinding(
                     name,
                     binding);
             }
             else
             {
                 component.getAttributes().put(name, Boolean.valueOf(value));
             }
         }
     }
 
     /**
      * Gets the attribute from the given object.  The object can be either a context, request
      * or response (HttpServletContext/PortletContext, HttpServletRequest/PortletRequest, etc).
      *
      * @param object the object from which to retrieve the attribute.
      * @param attributeName the attribute name.
      * @return the value of the attribute if one is present.
      */
     public static Object getAttribute(final Object object, final String attributeName)
     {
         try
         {
             Object attribute = null;
             if (object != null)
             {
                 try
                 {
                     final Method method = object.getClass().getMethod("getAttribute", new Class[]{String.class});
                     attribute = method.invoke(object, attributeName);
                 }
                 catch (NoSuchMethodException exception)
                 {
                     // Swallow Exception
                 }
             }
             return attribute;
         }
         catch (Exception exception)
         {
             throw new RuntimeException(exception);
         }
     }
 
     /**
      * Sets the attribute on the given object.  The object can be either a context, request
      * or response (HttpServletContext/PortletContext, HttpServletRequest/PortletRequest, etc).
      *
      * @param object the object on which to set the attribute.
      * @param attributeName the attribute name.
      * @param attributeValue the value of the attribute to set.
      */
     public static void setAttribute(final Object object, final String attributeName, final Object attributeValue)
     {
         try
         {
             if (object != null)
             {
                 try
                 {
                     final Method method = object.getClass().getMethod("setAttribute", new Class[]{String.class, Object.class});
                     method.invoke(object, attributeName, attributeValue);
                 }
                 catch (NoSuchMethodException ignore)
                 {
                     // Swallow exception
                 }
             }
         }
         catch (Exception exception)
         {
             throw new RuntimeException(exception);
         }
     }
 
     /**
      * Gets the context path from the given request object (PortletRequest/HttpServletRequest)
      *
      * @param request the request object from which to retrieve the context path.
      * @return the context path.
      */
     public static String getContextPath(final Object request)
     {
         try
         {
             String contextPath = null;
             if (request != null)
             {
                 contextPath = ObjectUtils.toString(request.getClass().getMethod("getContextPath", new Class[0]).invoke(request));
             }
             return contextPath;
         }
         catch (Exception exception)
         {
             throw new RuntimeException(exception);
         }
     }
 }