return all value against one key in hashmap

Question

I have one lookup file like this

REGEXP|Name
^.*?AAA.*?$|POP
^.*?AAA.*?$|SOP
^.*?BBB.*?$|ZOP
^.*?CCC.*?$|ROP

I have input string and matching my input string with this lookup file with REGEXP column. And where ever it matches, Its returning Name.

Step 1 I'm loading lookup file in my tool like this

import java.util.Map;
import java.util.HashMap;

Map<String, String> regexMap = new HashMap<String, String>();

globalMap.put("regexMap", regexMap);

Step 2

Loading lookup file in hashmap like this

Map<String, String> regexMap = (Map<String, String>)globalMap.get("regexMap");
 if( row1.REGEXP != null ) {
  regexMap.put( row1.REGEXP, row1.Name);
}

Step 3

Hitting input string with this hashmap like this

Map<String, String> regexMap = (Map<String, String>)globalMap.get("regexMap");
for( String key : regexMap.keySet() ) {
 if( input_row.data != null ) {
  if( input_row.data.matches(key) ) {
   output_row.Name = regexMap.get(key);
   break;
  }
 }
}

I'm getting one value only. I want all values with matches with single key. Like in above mentioned lookup, If any string matches with first two REGEXP, output_row.Name should return POP and SOP both. Right now its returning only SOP.

Is any thing am missing like using Array list or doing something wrong.

Suggestion please?

Java maps store exactly one value per key; if you want to store multiple "things" for a key, the value has to be some sort of collection. — Andy Turner, Jan 16 '17 at 17:27

score 0 · Answer 1 · edited May 23 '17 at 10:29

0

A map can store multiple values per key ... but you'll need to use a different container (e.g. a Map of List, or a MultiMap) instead of a HashMap:

HashMap: One Key, multiple Values

edited May 23 '17 at 10:29

Community

1
1

answered Jan 16 '17 at 17:29

paulsm4

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@paulsm4...Is anything I could change my in this existing code ? Do you think if I change my Map structure like this Map> regexMap = (Map>)globalMap.get("regexMap"); and change the type of Name from string to List...will work ? – kelly Jan 16 '17 at 17:41
I believe so. The basic problem is that your unfortunate choice of "HashMap" will *NOT* work. Please review the thread for details. – paulsm4 Jan 16 '17 at 21:09

return all value against one key in hashmap

1 Answers1