elsetag.java

来自「webwork source」· Java 代码 · 共 49 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;
import javax.servlet.jsp.tagext.TagSupport;

/**
 *
 * @author Maurice C. Parker ([e-mail])
 * @version $Revision: 1.7 $
 */
public class ElseTag
      extends TagSupport {
   // BodyTag implementation ---------------------------------------
   public int doStartTag() throws JspException {
      Boolean ifResult = getId() == null ?
            (Boolean) pageContext.getAttribute(IfTag.ANSWER) :
            (Boolean) pageContext.getAttribute(getId());

      pageContext.removeAttribute(IfTag.ANSWER);

      if (ifResult == null || ifResult.booleanValue() == true) {
         return SKIP_BODY;
      } else {
         return EVAL_BODY_INCLUDE;
      }
   }

   public int doEndTag() throws JspException
   {
      return super.doEndTag();
   }

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