iftag.java

来自「webwork source」· Java 代码 · 共 68 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: 1.9 $
 */
public class IfTag
      extends WebWorkTagSupport {
   // Attributes ----------------------------------------------------
   public final static String ANSWER = "webwork.if.answer";

   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 {
      answer = getStack().test(test);
      // Make comparison
      if (answer) {
         return EVAL_BODY_INCLUDE;
      } else {
         return SKIP_BODY;
      }
   }

   public int doEndTag() throws JspException {
      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);
   }

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