Author: aadamchik
Date: Mon Mar 21 19:17:30 2011
New Revision: 1083907
URL: http://svn.apache.org/viewvc?rev=1083907&view=rev
Log:
CAY-1547 cayenne-lifecycle: support for setting UuidRelationships
Added:
cayenne/main/trunk/framework/cayenne-lifecycle/src/main/java/org/apache/cayenne/lifecycle/relationship/UuidRelationshipHandler.java
Added:
cayenne/main/trunk/framework/cayenne-lifecycle/src/main/java/org/apache/cayenne/lifecycle/relationship/UuidRelationshipHandler.java
URL:
http://svn.apache.org/viewvc/cayenne/main/trunk/framework/cayenne-lifecycle/src/main/java/org/apache/cayenne/lifecycle/relationship/UuidRelationshipHandler.java?rev=1083907&view=auto
==============================================================================
---
cayenne/main/trunk/framework/cayenne-lifecycle/src/main/java/org/apache/cayenne/lifecycle/relationship/UuidRelationshipHandler.java
(added)
+++
cayenne/main/trunk/framework/cayenne-lifecycle/src/main/java/org/apache/cayenne/lifecycle/relationship/UuidRelationshipHandler.java
Mon Mar 21 19:17:30 2011
@@ -0,0 +1,95 @@
+/*****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ ****************************************************************/
+package org.apache.cayenne.lifecycle.relationship;
+
+import org.apache.cayenne.DataObject;
+import org.apache.cayenne.lifecycle.ref.ReferenceableHandler;
+
+/**
+ * @since 3.1
+ */
+public class UuidRelationshipHandler {
+
+ protected ReferenceableHandler referenceableHandler;
+
+ public UuidRelationshipHandler(ReferenceableHandler referenceableHandler) {
+ this.referenceableHandler = referenceableHandler;
+ }
+
+ public String uuidRelationshipName(String uuidPropertyName) {
+ return "cay:related:" + uuidPropertyName;
+ }
+
+ public String uuidPropertyName(DataObject object) {
+
+ UuidRelationship annotation = object.getClass().getAnnotation(
+ UuidRelationship.class);
+
+ if (annotation == null) {
+ throw new IllegalArgumentException(
+ "Object class is not annotated with @UuidRelationship: "
+ + object.getClass().getName());
+ }
+
+ // TODO: I guess we'll need to cache this metadata for performance if
we are to
+ // support inheritance lookups, etc.
+
+ return annotation.value();
+ }
+
+ /**
+ * Establishes a UUID relationship between two objects. Objects must be
registered in
+ * the same ObjectContext. "from" argument is the object annotated with
+ * UuidRelationship. Second argument can optionally be null.
+ */
+ public void relate(DataObject from, DataObject to) {
+
+ if (from.getObjectContext() == null) {
+ throw new IllegalArgumentException("'from' has null
ObjectContext");
+ }
+
+ String property = uuidPropertyName(from);
+ String relationship = uuidRelationshipName(property);
+
+ if (to != null) {
+ if (to.getObjectContext() == null) {
+ throw new IllegalArgumentException("'to' has null
ObjectContext");
+ }
+
+ if (from.getObjectContext() != to.getObjectContext()) {
+ throw new IllegalArgumentException(
+ "'from' and 'to' objects are registered in different
ObjectContexts");
+ }
+
+ if (to.getObjectId().isTemporary()
+ && !to.getObjectId().isReplacementIdAttached()) {
+ throw new UnsupportedOperationException("TODO - eager ID
generation");
+ }
+
+ String uuid = referenceableHandler.getUuid(to);
+
+ from.writeProperty(property, uuid);
+ from.writePropertyDirectly(relationship, to);
+ }
+ else {
+ from.writeProperty(property, null);
+ from.writePropertyDirectly(relationship, null);
+ }
+ }
+}
