Class ChooseTag

  • All Implemented Interfaces:
    java.io.Serializable, javax.servlet.jsp.tagext.IterationTag, javax.servlet.jsp.tagext.JspTag, javax.servlet.jsp.tagext.Tag

    public class ChooseTag
    extends javax.servlet.jsp.tagext.TagSupport

    Tag handler for <choose> in JSTL.

    <choose> is a very simple tag that acts primarily as a container; it always includes its body and allows exactly one of its child <when> tags to run. Since this tag handler doesn't have any attributes, it is common.core to both the rtexprvalue and expression- evaluating versions of the JSTL library.

    See Also:
    Serialized Form
    • Field Summary

      Fields 
      Modifier and Type Field Description
      private boolean subtagGateClosed  
      • Fields inherited from class javax.servlet.jsp.tagext.TagSupport

        id, pageContext
      • Fields inherited from interface javax.servlet.jsp.tagext.IterationTag

        EVAL_BODY_AGAIN
      • Fields inherited from interface javax.servlet.jsp.tagext.Tag

        EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE
    • Constructor Summary

      Constructors 
      Constructor Description
      ChooseTag()  
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int doStartTag()  
      boolean gainPermission()
      Returns status indicating whether a subtag should run or not.
      private void init()  
      void release()  
      void subtagSucceeded()
      Called by a subtag to indicate that it plans to evaluate its body.
      • Methods inherited from class javax.servlet.jsp.tagext.TagSupport

        doAfterBody, doEndTag, findAncestorWithClass, getId, getParent, getValue, getValues, removeValue, setId, setPageContext, setParent, setValue
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • subtagGateClosed

        private boolean subtagGateClosed
    • Constructor Detail

      • ChooseTag

        public ChooseTag()
    • Method Detail

      • release

        public void release()
        Specified by:
        release in interface javax.servlet.jsp.tagext.Tag
        Overrides:
        release in class javax.servlet.jsp.tagext.TagSupport
      • gainPermission

        public boolean gainPermission()
        Returns status indicating whether a subtag should run or not.
        Returns:
        true if the subtag should evaluate its condition and decide whether to run, false otherwise.
      • subtagSucceeded

        public void subtagSucceeded()
        Called by a subtag to indicate that it plans to evaluate its body.
      • doStartTag

        public int doStartTag()
                       throws javax.servlet.jsp.JspException
        Specified by:
        doStartTag in interface javax.servlet.jsp.tagext.Tag
        Overrides:
        doStartTag in class javax.servlet.jsp.tagext.TagSupport
        Throws:
        javax.servlet.jsp.JspException
      • init

        private void init()