Added the sample NestedGroup-MailMerge-with-JSON

Author: DharanyaSakthivel-SF4210

examples/mailmerge/NestedGroup-MailMerge-with-JSON/Program.java

@@ -0,0 +1,68 @@
+import com.syncfusion.docio.*;
+import com.syncfusion.javahelper.system.collections.generic.DictionarySupport;
+import com.syncfusion.javahelper.system.collections.generic.ListSupport;
+import com.google.gson.Gson;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonObject;
+
+public class Program {
+    public static void main(String[] args) throws Exception {
+        // JSON string containing nested organizational data
+    	String json = "{\"Organizations\":[{\"BranchName\":\"UK Office\",\"Address\":\"120 Hanover Sq.\",\"City\":\"London\",\"ZipCode\":\"WX1 6LT\",\"Country\":\"UK\",\"Departments\":[{\"DepartmentName\":\"Marketing\",\"Supervisor\":\"Nancy Davolio\",\"Employees\":[{\"EmployeeName\":\"Thomas Hardy\",\"EmployeeID\":\"1001\",\"JoinedDate\":\"05/27/1996\"},{\"EmployeeName\":\"Maria Anders\",\"EmployeeID\":\"1002\",\"JoinedDate\":\"04/10/1998\"}]},{\"DepartmentName\":\"Production\",\"Supervisor\":\"Andrew Fuller\",\"Employees\":[{\"EmployeeName\":\"Elizabeth Lincoln\",\"EmployeeID\":\"1003\",\"JoinedDate\":\"05/15/1996\"},{\"EmployeeName\":\"Antonio Moreno\",\"EmployeeID\":\"1004\",\"JoinedDate\":\"04/22/1996\"}]}]}]}";
+
+        // Convert JSON string into a JsonObject
+        JsonObject data = new Gson().fromJson(json, JsonObject.class);
+
+        // Convert JsonObject to DictionarySupport (required format for mail merge)
+        DictionarySupport<String, Object> result = getData(data);
+
+        // Load the Word document template
+        WordDocument document = new WordDocument("Template.docx");
+
+        // Extract the list of organizations for mail merge
+        MailMergeDataTable dataTable = new MailMergeDataTable("Organizations", 
+            (ListSupport<Object>) result.get("Organizations"));
+
+        // Perform nested mail merge with the data table
+        document.getMailMerge().executeNestedGroup(dataTable);
+
+        // Save the generated Word document
+        document.save("Result.docx", FormatType.Docx);
+        document.close();
+
+        System.out.println("Word document generated successfully.");
+    }
+
+    // Converts a JsonObject into a DictionarySupport for Syncfusion mail merge
+    public static DictionarySupport<String, Object> getData(JsonObject data) throws Exception {
+        DictionarySupport<String, Object> map = new DictionarySupport<>(String.class, Object.class);
+
+        for (String key : data.keySet()) {
+            Object keyValue = null;
+            if (data.get(key).isJsonArray()) {
+                // Convert array to ListSupport
+                keyValue = getData(data.getAsJsonArray(key));
+            } else if (data.get(key).isJsonPrimitive()) {
+                // Use primitive value directly
+                keyValue = data.get(key).getAsString();
+            }
+            map.add(key, keyValue);
+        }
+        return map;
+    }
+
+    // Converts a JsonArray into ListSupport recursively
+    public static ListSupport<Object> getData(JsonArray arr) throws Exception {
+        ListSupport<Object> list = new ListSupport<>(Object.class);
+
+        for (int i = 0; i < arr.size(); i++) {
+            Object keyValue = null;
+            if (arr.get(i).isJsonObject()) {
+                // Recursively convert nested objects
+                keyValue = getData(arr.get(i).getAsJsonObject());
+            }
+            list.add(keyValue);
+        }
+        return list;
+    }
+}