#1221 - ENH: Add a merge(bean) and merge(bean, paths)

src/main/java/io/ebeaninternal/server/persist/MergeNodeAssocOne.java

@@ -0,0 +1,60 @@
+package io.ebeaninternal.server.persist;
+
+import io.ebean.bean.EntityBean;
+import io.ebeaninternal.server.deploy.BeanPropertyAssocOne;
+
+import java.util.Objects;
+
+/**
+ * Node for processing merge on ToOne properties.
+ */
+class MergeNodeAssocOne extends MergeNode {
+
+  private final BeanPropertyAssocOne<?> one;
+
+  MergeNodeAssocOne(String fullPath, BeanPropertyAssocOne<?> property) {
+    super(fullPath, property);
+    this.one = property;
+  }
+
+  public void merge(MergeRequest request) {
+
+    EntityBean entityBean = getEntityBean(request.getBean());
+    if (entityBean == null) {
+      checkOrphanRemoval(request);
+
+    } else {
+      Object beanId = targetDescriptor.getId(entityBean);
+      if (beanId == null) {
+        checkOrphanRemoval(request);
+
+      } else {
+        EntityBean outlineBean = getEntityBean(request.getOutline());
+        Object outlineId = (outlineBean == null) ? null : targetDescriptor.getId(outlineBean);
+        if (isUpdate(beanId, outlineId, request)) {
+          entityBean._ebean_getIntercept().setForceUpdate(true);
+          cascade(entityBean, outlineBean, request);
+        }
+      }
+    }
+  }
+
+  private void checkOrphanRemoval(MergeRequest request) {
+    if (one.isOrphanRemoval()) {
+      EntityBean outlineBean = getEntityBean(request.getOutline());
+      if (outlineBean != null) {
+        request.addDelete(outlineBean);
+      }
+    }
+  }
+
+  private boolean isUpdate(Object beanId, Object outlineId, MergeRequest request) {
+    return Objects.equals(beanId, outlineId)
+      || !request.isClientGeneratedIds()
+      || request.idExists(targetDescriptor.getBeanType(), beanId);
+  }
+
+  private EntityBean getEntityBean(Object bean) {
+    return (EntityBean) one.getVal(bean);
+  }
+}