Examples of javax.servlet.jsp.el.ExpressionEvaluator

javax.servlet.jsp.el.ExpressionEvaluator
The abstract base class for an expression-language evaluator. Classes that implement an expression language expose their functionality via this abstract class.

An instance of the ExpressionEvaluator can be obtained via the JspContext / PageContext

The parseExpression() 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.

Only a single EL expression, starting with '${' and ending with '}', can be parsed or evaluated at a time. EL expressions cannot be mixed with static text. For example, attempting to parse or evaluate "abc${1+1}def${1+1}ghi" or even "${1+1}${1+1}" will cause an ELException to be thrown.

The following are examples of syntactically legal EL expressions:
- ${person.lastName}
- ${8 * 8}
- ${my:reverse('hello')}
@since 2.0 @deprecated As of JSP 2.1, replaced by javax.el.ExpressionFactory


class JSP20ExpressionEvaluatorProxy extends ExpressionEvaluatorProxy {




    public String evaluate(String value, PageContext pageContext) throws JspException {
        ExpressionEvaluator eval = pageContext.getExpressionEvaluator();


        try {
            Object evaluated = eval.evaluate(
                    value,
                    Object.class,
                    pageContext.getVariableResolver(),
                    null
            );

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        BeanVariableResolver resolver = null;


        if (validationInfo.expression() != null) {
            try {
                // Make sure we can get an evaluator
                ExpressionEvaluator evaluator = getEvaluator();
                if (evaluator == null) return;


                // If this turns out to be slow we could probably cache the parsed expression
                String expression = validationInfo.expression();
                expr = evaluator.parseExpression(expression, Boolean.class, null);
                resolver = new BeanVariableResolver(bean);
            }
            catch (ELException ele) {
                throw new StripesRuntimeException(
                        "Could not parse the EL expression being used to validate field " +

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    this.log = log;
  }


  // JavaDoc inherited
  public void handle(String data, ContentHandler handler) {
    ExpressionEvaluator evaluator = new ExpressionEvaluatorImpl();
    Object value;
    try {
      value = evaluator.evaluate(data, Object.class, resolver, mapper);
      if (value != null) {
        char[] result = value.toString().toCharArray();
        handler.characters(result, 0, result.length);
      } else {
        log.debug("Failed to resolve " + data);

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        this.log = log;
    }


    // JavaDoc inherited
    public void handle(String data, ContentHandler handler) {
        ExpressionEvaluator evaluator = new ExpressionEvaluatorImpl();
        Object value;
        try {
            value = evaluator.evaluate(data, Object.class, resolver, mapper);
            char[] result = value.toString().toCharArray();
            handler.characters(result, 0, result.length);
        } catch (ELException ele) {
            log.error("Failed to handle EL expression.", ele);
        } catch (SAXException saxe) {

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   *
   * @param data DOCUMENT ME!
   * @param handler DOCUMENT ME!
   */
  public void handle(String data, ContentHandler handler) {
    ExpressionEvaluator evaluator = new ExpressionEvaluatorImpl();
    Object value;


    try {
      value = evaluator.evaluate(data, Object.class, resolver, mapper);


      if (value != null) {
        char[] result = value.toString().toCharArray();
        handler.characters(result, 0, result.length);
      } else {

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   *
   * @param data DOCUMENT ME!
   * @param handler DOCUMENT ME!
   */
  public void handle(String data, ContentHandler handler) {
    ExpressionEvaluator evaluator = new ExpressionEvaluatorImpl();
    Object              value;


    try {
      value                       = evaluator.evaluate(data, Object.class, resolver, mapper);


      if (value != null) {
        char[] result = value.toString().toCharArray();
        handler.characters(result, 0, result.length);
      } else {

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