With ExpressionFlipStrategy conflict with AND and & in UI and Store

[vmartowicz]

Hi,
As mentioned in ##237 we have the same problem

see the source code 'org.ff4j.utils.MappingUtil'

public static final Map<String, String> toMap(String strParam) {
LinkedHashMap<String, String> parameters = new LinkedHashMap<String, String>();
if (strParam != null) {
//this line****************************
String[] chunks = strParam.split("" + SEPARATOR);
for (String chunk : chunks) {
int idxEqual = chunk.indexOf("=");
if (idxEqual > 0 && idxEqual < chunk.length()) {
String paramName = chunk.substring(0, idxEqual);
String paramValue = chunk.substring(idxEqual + 1);
parameters.put(paramName, paramValue);
}
}

We use :

• ff4j 1.8.11
• Mongo DB v3.5.5

The problem is not present with InMemoryFeatureStore because this implementation does not use MappingUtil.toMap.
The data is correctly stored but not read with MongoFeatureStore. The mapper gives 'dummy ' instead of 'dummy & foo'.

If we use AND as workaround, it is not working because ExpressionParser uses the constant AND declered as '&' and not 'AND' (String value).

For instance the expression dummy AND foo is not interpreted as feature 'dummy' AND feature 'foo' but only feature 'dummyANDfoo' which does not exist in this case.

[bbednarek]

It doesn't work with database implementation either

[vmartowicz]

@bbednarek I confirm
@clun I'm unable to use ExpressionFlipStrategy with physical Database (mongo or PG ) with condition 'AND'.

• UI render A AND B but not A & B
• Implementation does not work with A AND B, it always return false
  duplicate Expressions are not correctly rendered in ff4j-web #270