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  1. import java.util.HashMap;
  2. import java.util.Map;
  3. import java.util.Map.Entry;
  4. import java.util.Objects;
  5. import java.util.Set;
  6. import java.util.stream.Collectors;
  7.  
  8. class Ideone {
  9.     public static void main(String[] args) {
  10.         Map<String, Object> johnDoe = new HashMap<>();
  11.         johnDoe.put("name", "John Doe");
  12.         Map<String, Object> johnDoesAddress = new HashMap<>();
  13.         johnDoesAddress.put("street", "samplestress");
  14.         johnDoesAddress.put("city", "samplecity");
  15.         johnDoesAddress.put("country", "samplecountry");
  16.         johnDoe.put("address", johnDoesAddress);
  17.  
  18.         Map<String, Object> janeDoe = new HashMap<>();
  19.         janeDoe.put("name", "Jane");
  20.         Map<String, Object> janeDoesAddress = new HashMap<>();
  21.         janeDoesAddress.put("street", null);
  22.         janeDoesAddress.put("city", "examplecity");
  23.         janeDoesAddress.put("country", "examplecountry");
  24.         janeDoe.put("address", janeDoesAddress);
  25.  
  26.         System.out.println(areStructuralEqual(johnDoe, janeDoe));
  27.         System.out.println(areStructuralEqual(johnDoesAddress, janeDoe));
  28.         System.out.println(areStructuralEqual(johnDoe, janeDoesAddress));
  29.         System.out.println(areStructuralEqual(johnDoesAddress, janeDoesAddress));
  30.     }
  31.  
  32.     @SuppressWarnings("unhecked")
  33.     public static boolean areStructuralEqual(Map<String, ?> left, Map<String, ?> right) {
  34.         if (!Objects.equals(left.keySet(), right.keySet())) {
  35.             return false;
  36.         }
  37.  
  38.         Set<String> leftKeysWithMapValues = extractAllKeysThatMapToMaps(left);
  39.         Set<String> rightKeysWithMapValues = extractAllKeysThatMapToMaps(right);
  40.         if (!Objects.equals(leftKeysWithMapValues, rightKeysWithMapValues)) {
  41.             return false;
  42.         }
  43.  
  44.         for (String key : leftKeysWithMapValues) {
  45.             if (!areStructuralEqual(
  46.                     (Map<String, ?>) left.get(key),
  47.                     (Map<String, ?>) right.get(key))) {
  48.                 return false;
  49.             }
  50.         }
  51.         return true;
  52.     }
  53.  
  54.     private static Set<String> extractAllKeysThatMapToMaps(Map<String, ?> map) {
  55.         return map.entrySet().stream()
  56.                 .filter(e -> e.getValue() instanceof Map)
  57.                 .map(Entry::getKey)
  58.                 .collect(Collectors.toUnmodifiableSet());
  59.     }
  60. }
Success #stdin #stdout 0.08s 34196KB
comments (?)
stdin 
Standard input is empty
stdout 
true
false
false
true
https://ideone.com/KFyZ5G
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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