Use template method pattern for creating business objects from json

Recognize super and sub categories when creating a Category object from json

src/main/java/de/unipotsdam/cs/toolup/model/Application.java

 package de.unipotsdam.cs.toolup.model;
 
+import de.unipotsdam.cs.toolup.exceptions.InvalidIdException;
+import org.json.JSONObject;
+
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.Set;
@@ -19,6 +22,12 @@ public class Application extends BusinessObject {
         this(uuid, "", "", new HashSet<String>(), new HashSet<String>());
     }
 
+    @Override
+    protected void buildSubClassSpecificAttributes(JSONObject jsonRepresentation) throws InvalidIdException {
+        addRelationFromJson(jsonRepresentation, JSON_KEY_FEATURES);
+        addRelationFromJson(jsonRepresentation, JSON_KEY_CATEGORIES);
+    }
+
     public Collection<String> getRelatedCategories() {
         return new HashSet<>(this.relations.get(TABLE_NAME_CATEGORY));
     }

src/main/java/de/unipotsdam/cs/toolup/model/BusinessObject.java

@@ -21,8 +21,8 @@ public abstract class BusinessObject {
     public static final String JSON_KEY_FEATURES = "features";
     public static final String JSON_KEY_CATEGORIES = "categories";
     public static final String JSON_KEY_APPLICATIONS = "applications";
-    static Map<String, String> keyMappingSqlJson = new HashMap<>(); //TODO Move to config file
 
+    static Map<String, String> keyMappingSqlJson = new HashMap<>(); //TODO Move to config file
     static {
         keyMappingSqlJson.put(TABLE_NAME_APPLICATION, JSON_KEY_APPLICATIONS);
         keyMappingSqlJson.put(TABLE_NAME_CATEGORY, JSON_KEY_CATEGORIES);
@@ -77,18 +77,19 @@ public abstract class BusinessObject {
         newlyCreatedBO.title = jsonRepresentation.getString(JSON_KEY_TITLE);
         newlyCreatedBO.description = jsonRepresentation.getString(JSON_KEY_DESCRIPTION);
 
-        addRelationFromJson(newlyCreatedBO, jsonRepresentation, JSON_KEY_APPLICATIONS);
-        addRelationFromJson(newlyCreatedBO, jsonRepresentation, JSON_KEY_FEATURES);
-        addRelationFromJson(newlyCreatedBO, jsonRepresentation, JSON_KEY_CATEGORIES);
+        newlyCreatedBO.buildSubClassSpecificAttributes(jsonRepresentation);
+
+
 
         return newlyCreatedBO;
     }
 
-    private static void addRelationFromJson(BusinessObject newlyCreatedBO,
-                                            JSONObject jsonRepresentation, String relationKey) throws JSONException, InvalidIdException {
+    protected abstract void buildSubClassSpecificAttributes(JSONObject jsonRepresentation) throws InvalidIdException;
+
+    protected void addRelationFromJson(JSONObject jsonRepresentation, String relationKey) throws JSONException, InvalidIdException {
         if (jsonRepresentation.has(relationKey)) {
             JSONArray relationElements = jsonRepresentation.getJSONArray(relationKey);
-            addIdsOfAllElements(newlyCreatedBO, relationElements);
+            addIdsOfAllElements(this, relationElements);
         }
     }
 

src/main/java/de/unipotsdam/cs/toolup/model/Category.java

 package de.unipotsdam.cs.toolup.model;
 
+import de.unipotsdam.cs.toolup.exceptions.InvalidIdException;
+import org.json.JSONArray;
+import org.json.JSONObject;
+
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.Set;
@@ -8,6 +12,8 @@ import static de.unipotsdam.cs.toolup.database.DatabaseController.TABLE_NAME_APP
 
 public class Category extends BusinessObject {
 
+    private static final String JSON_KEY_SUPERCATEGORY = "supercategory";
+    private static final String JSON_KEY_SUBCATEGORIES = "subcategories";
     private String superCategory = "";
     private Collection<String> subCategories = new HashSet<>();
 
@@ -20,6 +26,20 @@ public class Category extends BusinessObject {
         this(uuid, "", "", new HashSet<String>());
     }
 
+    @Override
+    protected void buildSubClassSpecificAttributes(JSONObject jsonRepresentation) throws InvalidIdException {
+        addRelationFromJson(jsonRepresentation, JSON_KEY_APPLICATIONS);
+
+        this.superCategory = jsonRepresentation.getString(JSON_KEY_SUPERCATEGORY);
+
+        JSONArray subcategories = jsonRepresentation.getJSONArray(JSON_KEY_SUBCATEGORIES);
+
+        for (int i = 0; i < subcategories.length(); i++) {
+            JSONObject subCat = subcategories.getJSONObject(i);
+            this.subCategories.add(subCat.getString(JSON_KEY_ID));
+        }
+    }
+
     public Collection<String> getRelatedApplications() {
         return new HashSet<>(this.relations.get(TABLE_NAME_APPLICATION));
     }

src/main/java/de/unipotsdam/cs/toolup/model/Feature.java

 package de.unipotsdam.cs.toolup.model;
 
+import de.unipotsdam.cs.toolup.exceptions.InvalidIdException;
+import org.json.JSONObject;
+
 import java.util.Collection;
 import java.util.HashSet;
 
@@ -17,6 +20,11 @@ public class Feature extends BusinessObject {
         this(uuid, "", "", new HashSet<String>());
     }
 
+    @Override
+    protected void buildSubClassSpecificAttributes(JSONObject jsonRepresentation) throws InvalidIdException {
+        addRelationFromJson(jsonRepresentation, JSON_KEY_APPLICATIONS);
+    }
+
     public Collection<String> getRelatedApplications() {
         return new HashSet<>(this.relations.get(TABLE_NAME_APPLICATION));
     }

src/main/java/de/unipotsdam/cs/toolup/model/NullBusinessObject.java

 package de.unipotsdam.cs.toolup.model;
 
 
+import de.unipotsdam.cs.toolup.exceptions.InvalidIdException;
+import org.json.JSONObject;
+
 /**
  * NullBusinessObject represents the absence of a {@link BusinessObject} according to the NullObjectPattern.
  *
@@ -28,6 +31,10 @@ public class NullBusinessObject extends BusinessObject {
         return instance;
     }
 
+    @Override
+    protected void buildSubClassSpecificAttributes(JSONObject jsonRepresentation) throws InvalidIdException {
+    }
+
     @Override
     public void addRelation(String string) {
     }