topic Re: Iterate through HashMap in Talend Studio

Iterate through HashMap

Anonymous — Sat, 16 Nov 2024 09:49:09 GMT

Hi Friends,

The following is my scenario,

Map<String, HashSet<String>> iB = new HashMap<String, HashSet<String>>();

if(!iB.containsKey(row5.i)){
iB.put(row5.i,new HashSet<String>());
}
iB.get(row5.i).add(row5.c);

globalMap.put("iBMap", iB);

for(String i:globalMap.get("iBMap".keySet())){

row10.issue = i;
StringBuilder sb = new StringBuilder();
for(String c : globalMap.get("iBMap").get(i)) {
sb.append("'").append(cusip).append("'").append(",");
row10.color=c;
}

}

Can anyone give some opinions that the reason why this can't go through?

Thanks!!

Re: Iterate through HashMap

TRF — Fri, 05 May 2017 20:19:25 GMT

What do you expect?

Re: Iterate through HashMap

Anonymous — Fri, 05 May 2017 20:21:23 GMT

Thanks for your reply, TRF.

My expectation is passing the value of HashMap(In my case it's a HashSet) to row10..

Re: Iterate through HashMap

TRF — Fri, 05 May 2017 20:56:58 GMT

You should try to expose your use case with sample data and expected result.

Re: Iterate through HashMap

cterenzi — Fri, 05 May 2017 21:20:56 GMT

You should also give us a hint as to your job structure and any error messages.

Just from looking at your code, you're not casting your globalMap.get() results to the appropriate type. The get() method returns type Object, so you should cast to the right type if you want to use applicable methods.

You also need to get the object before you can operate on it. This means globalMap.get("iBMap".keySet()) won't work, but (Map)globalMap.get("iBMap").keySet() should.

Also, since you appear to be using a custom code component, you should get() iBMap once, operate on the local object, and then put() it when finished to save changes. (i.e. assign (Map)globalMap.get("iBMap") to a local variable and loop over it, retrieving keys and values from it rather than constantly getting the object from globalMap).

All that said, this type of setup doesn't really leverage Talend's strengths. With a more general explanation of your use case, we may be able to suggest an approach that doesn't involve custom Java code.

Re: Iterate through HashMap

Anonymous — Fri, 05 May 2017 21:24:55 GMT

Thanks so much, it works!