Mirth: Evaulating SWITCH versus IF Statement - mirth

Question

I'm using a product called Mirth (version 3.6) to execute transform code. It doesn't seem to have an interactive debugger so can anyone explain why the following code in a destination transform will only log from the IF statement and not from the SWITCH statement? Works perfectly from regular java running in Eclipse but this code is executing inside a JavaScript engine that Mirth uses (Rhino if I'm not mistaken).
for each (node in msg['PID'].children())
{
if(node.name() == "PID.3")
{
logger.info("IF Succeeded");
}
switch(node.name())
{
case "PID.3":
logger.info("SWITCH Succeeded"); // This line never logs
break;
}
}

Answer 1

This is a common issue with Mirth Connect since it uses Rhino as it's engine (uses java as well as javascript).
The Switch statement doesn't work with a Java String object
The simple solution is to convert any unknown string type to a native JS string by concatenating an empty string to the questionable string (i.e. str + '')
// See in action
for each (node in msg['PID'].children())
{
var nodeName = node.name();
if (nodeName != "PID.3")
{
continue;
}
var type = typeof(nodeName);
logger.debug('NodeName: ' + nodeName + '; Type: ' + type);
if (type == 'object') {
logger.debug('Type is object');
if (nodeName instanceof String) {
logger.debug('Object is Java String instance');
} else {
logger.debug('Object is not Java String instance');
}
} else if (type === 'string') {
logger.debug('Type is JS string.');
} else {
logger.debug('Type is not object or string. Type: ' + type);
}
// Works with String object or JS string
if (nodeName == "PID.3")
{
logger.info("IF Succeeded");
}
// Only works with JS string
switch (nodeName)
{
case "PID.3":
logger.info("SWITCH Succeeded"); // This line never logs
break;
default:
logger.info("SWITCH not matched: " + nodeName);
break;
}
logger.debug('Convert to JS string');
nodeName = nodeName + '';
type = typeof(nodeName);
logger.debug('Converted Type: ' + type);
if (type == 'object') {
logger.debug('Converted Type is object');
if (nodeName instanceof String) {
logger.debug('Converted Object is String instance');
} else if (nodeName instanceof string) {
logger.debug('Converted Object is string instance');
} else {
logger.debug('Converted Object is not Java String instance');
}
} else if (type === 'string') {
logger.debug('Converted Type is JS string.');
} else {
logger.debug('Converted Type is not object or string. Type: ' + type);
}
switch(nodeName)
{
case "PID.3":
logger.info("SWITCH with js string Succeeded");
break;
default:
logger.info("SWITCH with js string not matched: " + nodeName);
break;
}
break;
}