chore: implementation of includeReference

Author: reeshika-h

src/main/java/com/contentstack/cms/stack/Entry.java

@@ -7,7 +7,10 @@
 import retrofit2.Call;
 import retrofit2.Retrofit;
 
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 
@@ -85,26 +88,14 @@ public Entry addHeader(@NotNull String key, @NotNull String value) {
      */
     @Override
     public Entry addParam(@NotNull String key, @NotNull Object value) {
-        if (key.equals("include[]")) {
-            if (value instanceof String[]) {
-                for (String item : (String[]) value) {
-                    this.params.put(key + includeCounter++, item);
-                }
-            } else if (value instanceof String) {
-                this.params.put(key + includeCounter++, value);
-            }
-        } else {
-            this.params.put(key, value);
-        }
+        this.params.put(key, value);
         return this;
     }
 
 
     @Override
     public Entry addParams(@NotNull HashMap<String, Object> params) {
-        for (Map.Entry<String, Object> entry : params.entrySet()) {
-            addParam(entry.getKey(), entry.getValue());
-        }
+        this.params.putAll(params);
         return this;
     }
 
@@ -135,6 +126,19 @@ protected Entry clearParams() {
         return this;
     }
 
+    public Call<ResponseBody> includeReference(@NotNull Object referenceFields) {
+        List<String> referenceList = new ArrayList<>();
+        if (referenceFields instanceof String) {
+            referenceList.add((String) referenceFields);
+        } else if (referenceFields instanceof String[]) {
+            referenceList.addAll(Arrays.asList((String[]) referenceFields));
+        } else {
+            throw new IllegalArgumentException("Reference fields must be a String or an array of Strings");
+        }
+        validateCT();
+        validateEntry();
+        return this.service.referCall(this.headers, this.contentTypeUid, referenceList);
+}
     /**
      * <b>Fetches the list of all the entries of a particular content type.</b>
      * It also returns the content of each entry in JSON format. You can also

src/main/java/com/contentstack/cms/stack/EntryService.java

@@ -5,6 +5,7 @@
 import retrofit2.Call;
 import retrofit2.http.*;
 
+import java.util.List;
 import java.util.Map;
 
 public interface EntryService {
@@ -14,6 +15,12 @@ Call<ResponseBody> fetch(
             @HeaderMap Map<String, Object> headers,
             @Path("content_type_uid") String contentTypeUid,
             @QueryMap(encoded = true) Map<String, Object> queryParameter);
+            
+    @GET("content_types/{content_type_uid}/entries")
+    Call<ResponseBody> referCall(
+            @HeaderMap Map<String, Object> headers,
+            @Path("content_type_uid") String contentTypeUid,
+            @Query("include[]") List<String> values);       
 
     @Headers("Content-Type: application/json")
     @GET("content_types/{content_type_uid}/entries/{entry_uid}")

src/test/java/com/contentstack/cms/stack/EntryFieldUnitTests.java

@@ -100,22 +100,12 @@ void testSingleEntryQuery() {
         Request resp = entryInstance.fetch().request();
         Assertions.assertEquals("include_publish_details=true&locale=en-us&include_workflow=false", resp.url().query());
     }
-    
-    @Test
-    void testaddParam(){
-        String[] array = {"reference","navigation_menu.page_reference"};
-        entryInstance.addParam("include[]", array);
-        Request request = entryInstance.find().request();
-        Assertions.assertEquals("include[]1=reference&include[]2=navigation_menu.page_reference", request.url().query());
-    }
 
     @Test
-    void testaddParams() throws IOException{
-        HashMap<String, Object> paramslist = new HashMap<>();
-        paramslist.put("include[]",  new String[]{"reference", "navigation_menu.page_reference"});
-        entryInstance.addParams(paramslist);
-        Request request = entryInstance.find().request();
-       Assertions.assertEquals("include[]1=reference&include[]2=navigation_menu.page_reference", request.url().query());
+    void testIncludeReference() {
+        String[] array = {"reference","navigation_menu.page_reference"};
+        Request req = entryInstance.includeReference(array).request();
+        Assertions.assertEquals("include[]=reference&include[]=navigation_menu.page_reference", req.url().query());
     }
 
     @Test