Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / request / NextOrderedSetElement.java

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/NextOrderedSetElement.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/NextOrderedSetElement.java
new file mode 100644 (file)
index 0000000..0c5afcf
--- /dev/null
+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/NextOrderedSetElement.java
@@ -0,0 +1,47 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.db.layer0.request;\r
+\r
+import org.simantics.db.AsyncReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.common.request.ResourceAsyncRead2;\r
+import org.simantics.db.procedure.AsyncProcedure;\r
+\r
+public class NextOrderedSetElement extends ResourceAsyncRead2<Resource> {\r
+\r
+    public NextOrderedSetElement(Resource list, Resource element) {\r
+        super(list, element);\r
+    }\r
+    \r
+    @Override\r
+    public void perform(AsyncReadGraph graph, final AsyncProcedure<Resource> procedure) {\r
+\r
+        // resource = the list\r
+        // resource2 = the element\r
+        \r
+        graph.forPossibleObject(resource2, resource, new AsyncProcedure<Resource>() {\r
+\r
+            @Override\r
+            public void exception(AsyncReadGraph graph, Throwable t) {\r
+                procedure.exception(graph, t);\r
+            }\r
+\r
+            @Override\r
+            public void execute(AsyncReadGraph graph, Resource next) {\r
+                if(resource.equals(next)) procedure.execute(graph, null);\r
+                else procedure.execute(graph, next);\r
+            }\r
+        });            \r
+        \r
+    }\r
+    \r
+}
\ No newline at end of file