elseiftag.java

来自「webwork source」· Java 代码 · 共 79 行

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

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.Tag;

/**
 *
 * @author Maurice C. Parker ([e-mail])
 * @version $Revision: 1.8 $
 */
public class ElseIfTag
      extends WebWorkTagSupport {
   // Attributes ----------------------------------------------------
   protected String test;
   protected boolean answer;

   // Public --------------------------------------------------------
   /**
    * Set the test condition.
    *
    * @param   str
    */
   public void setTest(String str) {
      test = str;
   }

   // BodyTag implementation ---------------------------------------
   public int doStartTag() throws JspException {
      Boolean ifResult = getId() == null ?
            (Boolean) pageContext.getAttribute(IfTag.ANSWER) :
            (Boolean) pageContext.getAttribute(getId());

      if (ifResult == null || ifResult.booleanValue() == true) {
         return SKIP_BODY;
      }
      answer = getStack().test(test);
      // Make comparison
      if (answer) {
         return EVAL_BODY_INCLUDE;
      } else {
         return SKIP_BODY;
      }
   }

   public int doEndTag() throws JspException {
      if (answer) {
         if (getId() != null)
            pageContext.setAttribute(getId(), new Boolean(answer));

         pageContext.setAttribute(IfTag.ANSWER, new Boolean(answer));
      }
      answer=false;
      return EVAL_PAGE;
   }

   public void setParent(Tag t) {
      super.setParent(t);

      // Reset
      //test = null;
      //answer = false;
   }

   public void release()
   {
      setId(null);
      super.release();
   }
}