[jira] [Created] (JEXL-435) Changed behavior of empty operator overloading

["Vincent Bussol (Jira)" <ji...@apache.org>]

Vincent Bussol created JEXL-435:
-----------------------------------

             Summary: Changed behavior of empty operator overloading
                 Key: JEXL-435
                 URL: https://issues.apache.org/jira/browse/JEXL-435
             Project: Commons JEXL
          Issue Type: Bug
    Affects Versions: 3.4.1
            Reporter: Vincent Bussol


In the previous versions (since [3.2|https://github.com/apache/commons-jexl/commit/7f1336e81d1b84ffe53d53a408380e5cfd94d91c]), it was possible to overload the empty operator and return an object that was not a boolean.

The java documentation still mentions:
{code:java}
Note that the result may not be a boolean. {code}
The current version returns true if the returned object is not a boolean.

 
{code:java}
public static class OverloadedArithmetic extends JexlArithmetic {
    public OverloadedArithmetic(boolean strict) {
        super(strict);
    }
    public Object empty(String type) {
        if ("list".equals(type)) {
            return Collections.emptyList();
        }
        return null;
    }
}

@Test
void test() {
    JexlArithmetic arithmetic = new OverloadedArithmetic(true);
    JexlEngine jexl = new JexlBuilder().arithmetic(arithmetic).create();
    final String src = "empty('list')";
    final JexlScript script = jexl.createScript(src);
    assertNotNull(script);
    final Object result = script.execute(null);
    assertTrue(result instanceof List);
}{code}
 

 

 



--
This message was sent by Atlassian Jira
(v8.20.10#820010)