i18ntag.java

webwork source

/*
 * WebWork, Web Application Framework
 *
 * Distributable under Apache license.
 * See terms of license at opensource.org
 */
package webwork.view.taglib;

import org.apache.commons.logging.*;

import javax.servlet.jsp.JspException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.ref.SoftReference;
import java.text.DateFormat;
import java.text.Format;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.WeakHashMap;
import java.util.ResourceBundle;
import java.util.MissingResourceException;

import webwork.action.factory.ActionFactory;
import webwork.action.ActionSupport;
import webwork.action.ActionContext;

/**
 * Gets a resource bundle and place it on the value stack. This allows
 * the text tag to access messages from any bundle, and not just the bundle
 * associated with the current action.
 *
 * @author Rickard 謆erg ([e-mail])
 * @version $Revision: 1.9 $
 */
public class I18nTag
   extends WebWorkTagSupport
{
   // Attributes ----------------------------------------------------
   protected String nameAttr;

   // Public --------------------------------------------------------
   public void setName(String aName)
   {
      nameAttr = aName;
   }

   // BodyTag implementation ----------------------------------------
   public int doStartTag() throws JspException
   {
      // Get bundle
      try
      {
         String name = this.findString(nameAttr);
         ResourceBundle bundle = (ResourceBundle)findValue("texts('"+name+"')");

         if (bundle == null)
         {
            // No bundle found, so most likely no action on stack
            // Get a bundle using the default ActionSupport class
            ActionContext context = new ActionContext();
            context.setRequestImpl((HttpServletRequest)pageContext.getRequest());
            context.setResponseImpl((HttpServletResponse)pageContext.getResponse());
            context.setServletContextImpl(pageContext.getServletContext());
            ActionContext.setContext(context);
            bundle = ((ActionSupport)ActionFactory.getAction(ActionSupport.class.getName())).getTexts(name);
         }

         getStack().pushValue(new BundleAccessor(bundle));
      } catch (Exception e)
      {
         LogFactory.getLog(getClass()).error("Could not find the bundle "+nameAttr, e);
         throw new JspException("Could not find the bundle "+nameAttr);
      }

      return EVAL_BODY_INCLUDE;
   }

   public int doEndTag() throws JspException
   {
      getStack().popValue();
      return EVAL_PAGE;
   }

   // This is what the text tag will use to access the bundle
   public static class BundleAccessor
   {
      ResourceBundle bundle;

      public BundleAccessor(ResourceBundle aBundle)
      {
         bundle = aBundle;
      }

      public String getText(String aName)
      {
         return bundle.getString(aName);
      }
   }
}