Package org.apache.taglibs.standard.lang.jstl

Class Evaluator

  • All Implemented Interfaces:
    ExpressionEvaluator
    public class Evaluator
extends java.lang.Object
implements ExpressionEvaluator

    This is the expression evaluator "adapter" that customizes it for use with the JSP Standard Tag Library. It uses a VariableResolver implementation that looks up variables from the PageContext and also implements its implicit objects. It also wraps ELExceptions in JspExceptions that describe the attribute name and value causing the error.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      (package private) static ELEvaluator sEvaluator
      The singleton instance of the evaluator *

    • Constructor Summary

      Constructors 
      Constructor Description
      Evaluator()  

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.Object evaluate​(java.lang.String pAttributeName, java.lang.String pAttributeValue, java.lang.Class pExpectedType, javax.servlet.jsp.tagext.Tag pTag, javax.servlet.jsp.PageContext pPageContext)
      Conduit to old-style call for convenience.
      java.lang.Object evaluate​(java.lang.String pAttributeName, java.lang.String pAttributeValue, java.lang.Class pExpectedType, javax.servlet.jsp.tagext.Tag pTag, javax.servlet.jsp.PageContext pPageContext, java.util.Map functions, java.lang.String defaultPrefix)
      Evaluates the expression at request time
      static java.lang.String parseAndRender​(java.lang.String pAttributeValue)
      Parses the given attribute value, then converts it back to a String in its canonical form.
      java.lang.String validate​(java.lang.String pAttributeName, java.lang.String pAttributeValue)
      Translation time validation of an attribute value.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • sEvaluator

        static ELEvaluator sEvaluator
        The singleton instance of the evaluator *

    • Constructor Detail

      • Evaluator

        public Evaluator()

    • Method Detail

      • validate

        public java.lang.String validate​(java.lang.String pAttributeName,
                                 java.lang.String pAttributeValue)
        Translation time validation of an attribute value. This method will return a null String if the attribute value is valid; otherwise an error message.
        Specified by:
        validate in interface ExpressionEvaluator

      • evaluate

        public java.lang.Object evaluate​(java.lang.String pAttributeName,
                                 java.lang.String pAttributeValue,
                                 java.lang.Class pExpectedType,
                                 javax.servlet.jsp.tagext.Tag pTag,
                                 javax.servlet.jsp.PageContext pPageContext,
                                 java.util.Map functions,
                                 java.lang.String defaultPrefix)
                          throws javax.servlet.jsp.JspException
        Evaluates the expression at request time
        Throws:
        javax.servlet.jsp.JspException

      • evaluate

        public java.lang.Object evaluate​(java.lang.String pAttributeName,
                                 java.lang.String pAttributeValue,
                                 java.lang.Class pExpectedType,
                                 javax.servlet.jsp.tagext.Tag pTag,
                                 javax.servlet.jsp.PageContext pPageContext)
                          throws javax.servlet.jsp.JspException
        Conduit to old-style call for convenience.
        Specified by:
        evaluate in interface ExpressionEvaluator
        Throws:
        javax.servlet.jsp.JspException

      • parseAndRender

        public static java.lang.String parseAndRender​(java.lang.String pAttributeValue)
                                       throws javax.servlet.jsp.JspException
        Parses the given attribute value, then converts it back to a String in its canonical form.
        Throws:
        javax.servlet.jsp.JspException