Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.browsing.ui.model / src / org / simantics / browsing / ui / model / queries / IsNodeContextRemovable.java

diff --git a/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/queries/IsNodeContextRemovable.java b/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/queries/IsNodeContextRemovable.java
new file mode 100644 (file)
index 0000000..5097f51
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/queries/IsNodeContextRemovable.java
@@ -0,0 +1,63 @@
+/*******************************************************************************\r
+ * Copyright (c) 2015 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
+ *     Semantum Oy - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.browsing.ui.model.queries;\r
+\r
+import java.util.Collections;\r
+\r
+import org.simantics.browsing.ui.BuiltinKeys;\r
+import org.simantics.browsing.ui.NodeContext;\r
+import org.simantics.browsing.ui.model.actions.ActionBrowseContext;\r
+import org.simantics.browsing.ui.model.browsecontexts.ActionBrowseContextRequest;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.common.procedure.adapter.TransientCacheAsyncListener;\r
+import org.simantics.db.common.request.Queries;\r
+import org.simantics.db.common.request.UnaryRead;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.layer0.adapter.Remover;\r
+import org.simantics.project.ontology.ProjectResource;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ * @since 1.18.1\r
+ */\r
+public class IsNodeContextRemovable extends UnaryRead<NodeContext, Boolean> {\r
+\r
+    public IsNodeContextRemovable(NodeContext context) {\r
+        super(context);\r
+    }\r
+\r
+    @Override\r
+    public Boolean perform(ReadGraph graph) throws DatabaseException {\r
+        boolean result = false;\r
+        try {\r
+            ActionBrowseContext defaultContext = graph.syncRequest(\r
+                    new ActionBrowseContextRequest(Collections.singleton(ProjectResource.getInstance(graph).ProjectActionContext)),\r
+                    TransientCacheAsyncListener.<ActionBrowseContext>instance());\r
+            ActionBrowseContext browseContext = ActionBrowseContext.get(graph, parameter, defaultContext);\r
+            if (browseContext != null && !browseContext.canRemove(graph, parameter))\r
+                return false;\r
+            result = true;\r
+        } catch (DatabaseException e) {\r
+            return false;\r
+        }\r
+\r
+        Object input = parameter.getConstant(BuiltinKeys.INPUT);\r
+        if (result && input instanceof Resource) {\r
+            Remover remover = graph.syncRequest(Queries.adapt((Resource) input, Remover.class, true));\r
+            if (remover != null)\r
+                return remover.canRemove(graph, null) == null;\r
+        }\r
+        return result;\r
+    }\r
+\r
+}\r