#115 - Mapping - Add support for @ElementCollection enhancement

Initial support - add simple Set support and Json support for simple List and Set.

src/main/java/io/ebeaninternal/server/deploy/BeanSetHelpElement.java

@@ -0,0 +1,30 @@
+package io.ebeaninternal.server.deploy;
+
+import io.ebean.bean.BeanCollection;
+import io.ebean.bean.EntityBean;
+import io.ebeaninternal.server.text.json.SpiJsonWriter;
+
+/**
+ * Helper for element collection List.
+ */
+public class BeanSetHelpElement<T> extends BeanSetHelp<T> {
+
+  BeanSetHelpElement(BeanPropertyAssocMany<T> many) {
+    super(many);
+  }
+
+  @Override
+  public void add(BeanCollection<?> collection, EntityBean bean, boolean withCheck) {
+    Object elementValue = bean._ebean_getField(0);
+    if (withCheck) {
+      collection.internalAddWithCheck(elementValue);
+    } else {
+      collection.internalAdd(elementValue);
+    }
+  }
+
+  @Override
+  void jsonWriteElement(SpiJsonWriter ctx, Object element) {
+    many.jsonWriteElementValue(ctx, element);
+  }
+}