In my application I have a for loop that gets data from a map and adds it to a new map that will contain more data from other data sources (several enumClass). I do it this way:
private static Map<String, String> myMapConversion() {
for (myEnunClassKeyOne key : document.keySet()) {
String keyObteined = key.toString();
String value = document.get(key);
globalConfig.put(convertKey(keyToConversion), value); // Extension function get value of myEnunClassKeyOne key
}
return globalConfig;
}
I have to do the same with other enumClasses and add the data to the same globalConfig map, something like this:
private static Map<String, String> mapConversion() {
for (myEnunClassKeyONE key : document.keySet()) {
String keyObteined = key.toString();
String value = document.get(key);
globalConfig.put(convertKey(keyToConversion), value); // Extension function get value of myEnunClassKeyOne key
}
for (myEnunClassKeyTWO key : document.keySet()) {
String keyObteined = key.toString();
String value = document.get(key);
globalConfig.put(convertKey(keyToConversion), value); // Extension function get value of myEnunClassKeyOne key
}
for (myEnunClassKeyTHREE key : document.keySet()) {
String keyObteined = key.toString();
String value = document.get(key);
globalConfig.put(convertKey(keyToConversion), value); // Extension function get value of myEnunClassKeyOne key
}
return globalConfig;
}
Repeating the for loops seems "inelegant" to me. Can you think of a way to do this in a more automated way?
I've tried a few ways, but haven't been able to get it to work. It would have to be java code, although a Kotlin extension function can be accepted
Thanks in advance
CodePudding user response:
In Java, you can create a list of your items and iterate that. I'm assuming these are actually three different documents.
private static Map<String, String> mapConversion() {
List<Map<?, String>> documents = List.of(document1, document2, document3);
for (Map<?, String> document : documents) {
for (Map.Entry<?, String> entry : document.entrySet()) {
String key = entry.getKey().toString();
String value = entry.getValue();
globalConfig.put(convertKey(keyToConversion), value);
}
}
return globalConfig;
}
In Kotlin, you can do this a little more concisely using mapKeysTo
:
fun mapConversion(): MutableMap<String, String> {
listOf(document1, document2, document3).forEach {
it.mapKeysTo(globalConifg) { (key, _) -> convertKey(key.toString()) }
}
return globalConfig
}