BAEL-6692 - converting json to map and comparing (#14630)

* BAEL-6692 - converting json to map and comparing * BAEL-6692 - converting json to map and comparing * BAEL-6692 - converting json to map and comparing
2023-08-30 21:50:22 +05:30
parent cdf8439c9b
commit 05ca686833
6 changed files with 146 additions and 0 deletions
@@ -0,0 +1,36 @@
+package com.baeldung.jsontomap;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class FlattenUtils {
+    public static Map<String, Object> flatten(Map<String, Object> map) {
+        return flatten(map, null);
+    }
+
+    private static Map<String, Object> flatten(Map<String, Object> map, String prefix) {
+        Map<String, Object> flatMap = new HashMap<>();
+        map.forEach((key, value) -> {
+            String newKey = prefix != null ? prefix + "." + key : key;
+            if (value instanceof Map) {
+                flatMap.putAll(flatten((Map<String, Object>) value, newKey));
+            } else if (value instanceof List) {
+                // check for list of primitives
+                Object element = ((List<?>) value).get(0);
+                if (element instanceof String || element instanceof Number || element instanceof Boolean) {
+                    flatMap.put(newKey, value);
+                } else {
+                    // check for list of objects
+                    List<Map<String, Object>> list = (List<Map<String, Object>>) value;
+                    for (int i = 0; i < list.size(); i++) {
+                        flatMap.putAll(flatten(list.get(i), newKey + "[" + i + "]"));
+                    }
+                }
+            } else {
+                flatMap.put(newKey, value);
+            }
+        });
+        return flatMap;
+    }
+}
@@ -0,0 +1,23 @@
+package com.baeldung.jsontomap;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.Map;
+
+public class JsonUtils {
+    public static Map<String, Object> jsonFileToMap(String path) throws IOException {
+        ObjectMapper mapper = new ObjectMapper();
+        return mapper.readValue(new File(path), new TypeReference<Map<String, Object>>() {});
+    }
+
+    public static Map<String, Object> jsonFileToMapGson(String path) throws IOException {
+        Gson gson = new Gson();
+        return gson.fromJson(new FileReader(path), new TypeToken<Map<String, Object>>() {}.getType());
+    }
+}