Example usage for javax.servlet.jsp.el ExpressionEvaluator parseExpression

Introduction

In this page you can find the example usage for javax.servlet.jsp.el ExpressionEvaluator parseExpression.

Prototype

public abstract Expression parseExpression(String expression, Class expectedType, FunctionMapper fMapper)
        throws ELException;

Source Link

Document

Prepare an expression for later evaluation.

Usage

From source file:io.undertow.test.jsp.expression.ExpressionJspTestCase.java

public static void evaluate(JspWriter out, PageContext pc, String qualifiedMethodExpression,
        String unqualifiedMethodExpression, String variableExpression) throws Exception {
    assert pc != null;
    TSFunctionMapper mapper = new TSFunctionMapper();
    ExpressionEvaluator eval = pc.getExpressionEvaluator();
    VariableResolver resolver = pc.getVariableResolver();
    assert eval != null : "Unable to obtain ExpressionEvaluator";
    Expression expr = eval.parseExpression(qualifiedMethodExpression, java.lang.String.class, mapper);
    assert expr != null;
    String result = (String) expr.evaluate(resolver);
    if (result != null) {
        if (result.equals("string")) {
            Expression expr2 = eval.parseExpression(variableExpression, javax.servlet.jsp.PageContext.class,
                    null);//from  ww  w.  j a v  a  2  s. co  m
            if (expr2 != null) {
                PageContext pageContext = (PageContext) expr2.evaluate(resolver);
                if (pageContext != pc) {
                    out.println("Test FAILED.  Resolution didn't return expected value.");
                    out.println("PageContext returned is not the same instance as expected.");
                }
                Expression expr3 = eval.parseExpression(unqualifiedMethodExpression, java.lang.String.class,
                        mapper);
                if (expr3 != null) {
                    result = (String) expr3.evaluate(resolver);
                    if (result != null) {
                        if (result.equals("string")) {
                            out.println("Test PASSED");
                        } else {
                            out.println("Test FAILED. (l3) Expression evaluation returned unexpected value.");
                            out.println("Expected 'string', received '" + result + "'");
                        }
                    } else {
                        out.println("Test FAILED.  (l3) Expression evaluation returned null.");
                    }
                } else {
                    out.println("Test FAILED. (l3) ExpressionEvaluator.parseExpression" + " returned null.");
                }
            } else {
                out.println("Test FAILED. (l2) ExpressionEvaluator returned null.");
            }
        } else {
            out.println("Test FAILED.  (l1) Expression evaluation returned unexpected result.");
            out.println("Expected 'string', Received '" + result + "'");
        }
    } else {
        out.println("Test FAILED. (l1) Expression evaluation returned null.");
    }

}

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