Tishy Tash :
I want to reduce the size (delete some elements) of an ordered list of map objects. All objects of list should be discarded unless a certain condition is met. And when that condition is met all next elements of that list should remained in the list. I have following piece of code. I want to do the same with Java 8.
public List<Map<String, String>> doAction(List<Map<String, String>> dataVoMap) {
List<Map<String,String>> tempMap = new ArrayList<>();
boolean found = false;
for(Map<String, String> map: dataVoMap){
if(map.get("service_id").equalsIgnoreCase("passed value") || found){
found = true;
tempMap.add(map);
}
}
dataVoMap = tempMap;
return dataVoMap;
}
Naman :
You are looking for a dropWhile operation, but an in-built implementation of that would require Java-9 and above:
public List<Map<String, String>> doAction(List<Map<String, String>> dataVoMap) {
return dataVoMap.stream()
.dropWhile(m -> !"passed value".equalsIgnoreCase(m.get("service_id")))
.collect(Collectors.toList());
}
Note: I have made an edit to the existing code to avoid NPE when there could be a Map in the List without the key service_id.
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