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Date: Sun, 1 Jul 2012 14:59:53 +0000 (UTC)
From: "Henri Biestro (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
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Subject: [jira] [Commented] (JEXL-134) Issue with evaluation of concat of
 variables : \r + \n gives 0
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    [ https://issues.apache.org/jira/browse/JEXL-134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13404738#comment-13404738 ] 

Henri Biestro commented on JEXL-134:
------------------------------------

Thanks for the bug report.
The culprit is the usage of trim in JexlArithemtic coercion methods toDouble and toBigDecimal which, in this case, will treat strings as empty and allow coercion to 0.
As a workaround, till 2.1.2 is released, you can derive JexlArithmetic and override the add method to treat String arguments early as in the following example.
Hope this helps.
{code}
    public static class Arithmetic134 extends JexlArithmetic {
        public Arithmetic134() {
            super(false);
        }
        @Override
        public Object add(Object lhs, Object rhs) {
            if (lhs instanceof String && rhs instanceof String) {
                return ((String) lhs) + ((String) rhs);
            } else {
               return super.add(lhs, rhs);
            }
        }
    }

    @Test
    public void test134() throws Exception {
        JexlEngine jexl = new JexlEngine(null, new Arithmetic134(), null, null);
        String jexlExp = "$$__INPUT + nl";
        Expression e = jexl.createExpression( jexlExp );
        // Create a context and add data
        JexlContext jc = new MapContext();
        jc.set("$$__INPUT", "\r" );
        jc.set("nl", "\n");
        // Now evaluate the expression, getting the result
        Object o = e.evaluate(jc);
        assertEquals("\r\n", o);
    }
{code}


> Issue with evaluation of concat of variables : \r + \n gives 0
> --------------------------------------------------------------
>
>                 Key: JEXL-134
>                 URL: https://issues.apache.org/jira/browse/JEXL-134
>             Project: Commons JEXL
>          Issue Type: Bug
>    Affects Versions: 2.1.1
>         Environment: Windows Xp, jdk1.6.0_14
>            Reporter: Manoj Mokashi
>            Assignee: Henri Biestro
>             Fix For: 2.1.2
>
>
> Consider the following example :
> 		String jexlExp = "$$__INPUT + nl";
> 		Expression e = jexl.createExpression( jexlExp );
> 		// Create a context and add data
> 		JexlContext jc = new MapContext();
> 		jc.set("$$__INPUT", "\r" );
> 		jc.set("nl", "\n");
> 		// Now evaluate the expression, getting the result
> 		Object o = e.evaluate(jc);
> The result is 0 instead of "\r\n"

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