#17 rough idea of how to implement custom attributes

README.md

@@ -19,7 +19,7 @@ Maven dependency:
 <dependency>
    <groupId>org.vaadin.miki</groupId>
    <artifactId>super-template</artifactId>
-   <version>0.2.1</version>
+   <version>0.2.2</version>
 </dependency>
 ```
 

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>org.vaadin.miki</groupId>
     <artifactId>super-template</artifactId>
-    <version>0.2.1</version>
+    <version>0.2.2-SNAPSHOT</version>
 
     <name>Super Template</name>
     <description>An extension of PolymerTemplate that reads properties from the template and makes them available on the server side. Requires Vaadin 14.X.</description>

src/main/java/org/vaadin/miki/supertemplate/ObjectAttributeHandler.java

@@ -0,0 +1,21 @@
+package org.vaadin.miki.supertemplate;
+
+import org.jsoup.nodes.Attribute;
+import org.jsoup.nodes.Element;
+
+/**
+ * A marker interface for objects that can update an attribute.
+ */
+@FunctionalInterface
+public interface ObjectAttributeHandler {
+
+    /**
+     * Updates the object, based on the value found in the passed attribute.
+     * @param object Object to update.
+     * @param attribute Attribute.
+     * @param element Element that corresponds to the object, for reference.
+     * @return {@code true} when the object has been successfully updated, {@code false} otherwise.
+     */
+    boolean updateObject(Object object, Attribute attribute, Element element);
+
+}

src/main/java/org/vaadin/miki/supertemplate/ReflectionAttributeHandler.java

@@ -0,0 +1,11 @@
+package org.vaadin.miki.supertemplate;
+
+import org.jsoup.nodes.Attribute;
+import org.jsoup.nodes.Element;
+
+public class ReflectionAttributeHandler implements ObjectAttributeHandler {
+    @Override
+    public boolean updateObject(Object object, Attribute attribute, Element element) {
+        return false;
+    }
+}