Examples of org.apache.taglibs.standard.lang.support.ExpressionEvaluator

Package org.apache.taglibs.standard.lang.support

Examples of org.apache.taglibs.standard.lang.support.ExpressionEvaluator

org.apache.taglibs.standard.lang.support.ExpressionEvaluator

The interface for an expression-language validator and evaluator. Classes that implement an expression language expose their functionality via this interface.

The validate() and evaluate() methods must be thread-safe. That is, multiple threads may call these methods on the same ExpressionEvaluator object simultaneously. Implementations should synchronize access if they depend on transient state. Implementations should not, however, assume that only one object of each ExpressionEvaluator type will be instantiated; global caching should therefore be static. No release() mechanism or robust lifecycle is specified, for language-interpreter pluggability is experimental in EA2.

WARNING: This class supports experimentation for the EA2 release of JSTL; it is not expected to be part of the final RI or specification.
@author Shawn Bayern (based exactly on rev1 draft)

public class ValidationUtil {
    static String validateExpression(
            String elem, String att, String expr) {


        // let's just use the cache kept by the ExpressionEvaluatorManager
        ExpressionEvaluator current;
        try {
            current =
                    ExpressionEvaluatorManager.getEvaluatorByName(
                            ExpressionEvaluatorManager.EVALUATOR_CLASS);
        } catch (JspException ex) {
            // (using JspException here feels ugly, but it's what EEM uses)
            return ex.getMessage();
        }


        String response = current.validate(att, expr);
        if (response == null) {
            return response;
        } else {
            return "tag = '" + elem + "' / attribute = '" + att + "': "
                    + response;

View Full Code Here

    // delegate validation to the appropriate expression language
    protected String validateExpression(
      String elem, String att, String expr) {


  // let's just use the cache kept by the ExpressionEvaluatorManager
  ExpressionEvaluator current;
  try {
      current =
          ExpressionEvaluatorManager.getEvaluatorByName(
                  ExpressionEvaluatorManager.EVALUATOR_CLASS);
  } catch (JspException ex) {
      // (using JspException here feels ugly, but it's what EEM uses)
      return ex.getMessage();
  }
  
  String response = current.validate(att, expr);
  if (response == null)
      return response;
  else
      return "tag = '" + elem + "' / attribute = '" + att + "': "
    + response;

View Full Code Here

    // delegate validation to the appropriate expression language
    protected String validateExpression(
      String elem, String att, String expr) {


  // let's just use the cache kept by the ExpressionEvaluatorManager
  ExpressionEvaluator current;
  try {
      current =
          ExpressionEvaluatorManager.getEvaluatorByName(
                  ExpressionEvaluatorManager.EVALUATOR_CLASS);
  } catch (JspException ex) {
      // (using JspException here feels ugly, but it's what EEM uses)
      return ex.getMessage();
  }
  
  String response = current.validate(att, expr);
  if (response == null)
      return response;
  else
      return "tag = '" + elem + "' / attribute = '" + att + "': "
    + response;

View Full Code Here

    // delegate validation to the appropriate expression language
    protected String validateExpression(
      String elem, String att, String expr) {


  // let's just use the cache kept by the ExpressionEvaluatorManager
  ExpressionEvaluator current;
  try {
      current =
          ExpressionEvaluatorManager.getEvaluatorByName(
                  ExpressionEvaluatorManager.EVALUATOR_CLASS);
  } catch (JspException ex) {
      // (using JspException here feels ugly, but it's what EEM uses)
      return ex.getMessage();
  }
  
  String response = current.validate(att, expr);
  if (response == null)
      return response;
  else
      return "tag = '" + elem + "' / attribute = '" + att + "': "
    + response;

View Full Code Here

    // delegate validation to the appropriate expression language
    protected String validateExpression(
      String elem, String att, String expr) {


  // let's just use the cache kept by the ExpressionEvaluatorManager
  ExpressionEvaluator current;
  try {
      current =
          ExpressionEvaluatorManager.getEvaluatorByName(
                  ExpressionEvaluatorManager.EVALUATOR_CLASS);
  } catch (JspException ex) {
      // (using JspException here feels ugly, but it's what EEM uses)
      return ex.getMessage();
  }
  
  String response = current.validate(att, expr);
  if (response == null)
      return response;
  else
      return "tag = '" + elem + "' / attribute = '" + att + "': "
    + response;

View Full Code Here

    // delegate validation to the appropriate expression language
    protected String validateExpression(
      String elem, String att, String expr) {


  // let's just use the cache kept by the ExpressionEvaluatorManager
  ExpressionEvaluator current;
  try {
      current =
          ExpressionEvaluatorManager.getEvaluatorByName(
                  ExpressionEvaluatorManager.EVALUATOR_CLASS);
  } catch (JspException ex) {
      // (using JspException here feels ugly, but it's what EEM uses)
      return ex.getMessage();
  }
  
  String response = current.validate(att, expr);
  if (response == null)
      return response;
  else
      return "tag = '" + elem + "' / attribute = '" + att + "': "
    + response;

View Full Code Here

    // delegate validation to the appropriate expression language
    protected String validateExpression(
      String elem, String att, String expr) {


  // let's just use the cache kept by the ExpressionEvaluatorManager
  ExpressionEvaluator current;
  try {
      current =
          ExpressionEvaluatorManager.getEvaluatorByName(
                  ExpressionEvaluatorManager.EVALUATOR_CLASS);
  } catch (JspException ex) {
      // (using JspException here feels ugly, but it's what EEM uses)
      return ex.getMessage();
  }
  
  String response = current.validate(att, expr);
  if (response == null)
      return response;
  else
      return "tag = '" + elem + "' / attribute = '" + att + "': "
    + response;

View Full Code Here

    // delegate validation to the appropriate expression language
    protected String validateExpression(
      String elem, String att, String expr) {


  // let's just use the cache kept by the ExpressionEvaluatorManager
  ExpressionEvaluator current;
  try {
      current =
          ExpressionEvaluatorManager.getEvaluatorByName(
                  ExpressionEvaluatorManager.EVALUATOR_CLASS);
  } catch (JspException ex) {
      // (using JspException here feels ugly, but it's what EEM uses)
      return ex.getMessage();
  }
  
  String response = current.validate(att, expr);
  if (response == null)
      return response;
  else
      return "tag = '" + elem + "' / attribute = '" + att + "': "
    + response;

View Full Code Here

    // delegate validation to the appropriate expression language
    protected String validateExpression(
      String elem, String att, String expr) {


  // let's just use the cache kept by the ExpressionEvaluatorManager
  ExpressionEvaluator current;
  try {
      current =
          ExpressionEvaluatorManager.getEvaluatorByName(
                  ExpressionEvaluatorManager.EVALUATOR_CLASS);
  } catch (JspException ex) {
      // (using JspException here feels ugly, but it's what EEM uses)
      return ex.getMessage();
  }
  
  String response = current.validate(att, expr);
  if (response == null)
      return response;
  else
      return "tag = '" + elem + "' / attribute = '" + att + "': "
    + response;

View Full Code Here

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Related Classes of org.apache.taglibs.standard.lang.support.ExpressionEvaluator

org.apache.taglibs.standard.tlv.el.ValidationUtil

org.apache.taglibs.standard.tlv.JstlBaseTLV

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