Add View-specific post-initialization

The form of this post-initialization is a method called postApply that is to be called just after mapping.

Closes #5 (closed)

src/main/java/nl/tudelft/librador/dto/create/Create.java

@@ -17,19 +17,49 @@
  */
 package nl.tudelft.librador.dto.create;
 
+import nl.tudelft.librador.dto.Validated;
+
 import org.modelmapper.ModelMapper;
 
-public abstract class Create<D> extends GenericCreate<D> {
+public abstract class Create<D> extends Validated {
+	@Override
+	public void validate() {
+		// leave empty
+	}
+
 	/**
 	 * Converts the DTO into the entity.
 	 *
-	 * @return the entity
+	 * @return The created entity.
 	 */
-	public D apply() {
-		ModelMapper mapper = createMapper();
+	public D apply(ModelMapper mapper) {
 		D data = mapper.map(this, clazz());
 		postApply(data);
-
 		return data;
 	}
+
+	/**
+	 * Configures the {@link ModelMapper} that will be used by the Create application.
+	 *
+	 * @return The {@link ModelMapper} created for mapping the Create DTO.
+	 */
+	protected ModelMapper createMapper() {
+		return new ModelMapper();
+	}
+
+	/**
+	 * Returns the class of the entity.
+	 *
+	 * @return the class of the entity
+	 */
+	public abstract Class<D> clazz();
+
+	/**
+	 * Does an action after the data is created but before it is returned in apply.
+	 *
+	 * @param data the data that was created
+	 */
+	protected void postApply(D data) {
+		// leave empty
+	}
 }