Examples of org.springframework.expression.ExpressionParser

org.springframework.expression.ExpressionParser
Parses expression strings into compiled expressions that can be evaluated. Supports parsing templates as well as standard expression strings. @author Keith Donald @author Andy Clement @since 3.0

   */
  public static String spelParser(String expressionStr,
      Map<String, Object> params, ParserContext parserContext) {
    StandardEvaluationContext context = new StandardEvaluationContext(
        params);
    ExpressionParser spel = new SpelExpressionParser();
    return spel.parseExpression(expressionStr, parserContext).getValue(
        context, String.class);
  }// ;

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  @SuppressWarnings("unchecked")
  @Override
  public Tuple select(String expression) {
    EvaluationContext context = new StandardEvaluationContext(toMap());
    ExpressionParser parser = new SpelExpressionParser();
    Expression exp = parser.parseExpression(expression);


    // TODO test instance is a map
    Object result = exp.getValue(context);
    Map<String, Object> resultMap = null;
    if (ClassUtils.isAssignableValue(Map.class, result)) {

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    return expression.getValue(evaluationContext, beanFactory);
  }


  private Expression parseExpression(String input) {
    if (StringUtils.hasText(input)) {
      ExpressionParser parser = new SpelExpressionParser();
      try {
        return parser.parseExpression(input);
      } catch (ParseException e) {
        throw new IllegalArgumentException("Cannot parse expression: " + input, e);
      }


    } else {

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    @Override
    public String print(Object object, Locale locale) {
        if (spelExpression == null) {
            return null;
        }
        ExpressionParser parser = new SpelExpressionParser();
        try {
            Object result = parser.parseExpression(spelExpression).getValue(evaluationContext, object);
            return result.toString();
        } catch (SpelParseException e) {
            throw new CustomFormatException("Could not parse spel expression = \"" + spelExpression + "\" in " + CustomFormat.class.getSimpleName() + " annotation: " + e.getMessage());
        }
    }

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