[jira] Created: (CAY-1177) Outer join syntax causes exception with Expression.filterObjects()

["Øyvind Harboe (JIRA)" <ji...@apache.org>]

Outer join syntax causes exception with Expression.filterObjects()
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                 Key: CAY-1177
                 URL: https://issues.apache.org/cayenne/browse/CAY-1177
             Project: Cayenne
          Issue Type: Bug
          Components: Cayenne Core Library
    Affects Versions: 3.0M5
            Reporter: Øyvind Harboe


If the "+." syntax is used in an Expression.filterObjects() it causes an exception. Below is a modification to CayenneDataObject.readNestedProperty() that seems to work around the problem. 

Simply replace "+." with "."

    public Object readNestedProperty(String path) {
        Object object = null;
        CayenneDataObject dataObject = this;
        
        /* convert +. outer join syntax into . */
        if (path.contains("+."))
        {
        	path=path.replaceAll("\\+\\.", ".");
        }
        
        String[] tokenized = tokenizePath(path);
        int length = tokenized.length;

        int pathIndex = 0;

        for (int i = 0; i < length; i++) {
            pathIndex += tokenized[i].length() + 1;

            object = dataObject.readSimpleProperty(tokenized[i]);

            if (object == null) {
                return null;
            }
            else if (object instanceof CayenneDataObject) {
                dataObject = (CayenneDataObject) object;
            }
            else if (i + 1 < length) {
                // read the rest of the path via introspection
                return PropertyUtils.getProperty(object, path.substring(pathIndex));
            }
        }

        return object;
    }


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