Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.diagram / src / org / simantics / diagram / symbolcontribution / ElementSymbolItem.java

diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/ElementSymbolItem.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/ElementSymbolItem.java
new file mode 100644 (file)
index 0000000..50ad796
--- /dev/null
+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/ElementSymbolItem.java
@@ -0,0 +1,96 @@
+/*******************************************************************************\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.diagram.symbolcontribution;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.RequestProcessor;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.common.request.ResourceRead;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.procedure.Listener;\r
+import org.simantics.db.request.Read;\r
+import org.simantics.diagram.query.DiagramRequests;\r
+import org.simantics.diagram.symbollibrary.ISymbolGroup;\r
+import org.simantics.diagram.symbollibrary.ISymbolItem;\r
+import org.simantics.diagram.synchronization.graph.BasicResources;\r
+import org.simantics.g2d.element.ElementClass;\r
+import org.simantics.g2d.element.handler.StaticSymbol;\r
+import org.simantics.ui.SimanticsUI;\r
+import org.simantics.utils.datastructures.cache.ProvisionException;\r
+import org.simantics.utils.datastructures.hints.IHintObservable;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class ElementSymbolItem extends SymbolItem {\r
+\r
+    public ElementSymbolItem(Resource item, String name, ISymbolGroup group) {\r
+        super(\r
+                AdaptableTriple.make(\r
+                        item,\r
+                        // Prevents infinite recursion which will happen\r
+                        // if SymbolGroup is used as group ID.\r
+                        group instanceof IIdentifiedObject ? ((IIdentifiedObject) group).getId() : group,\r
+                        // Name is in the identification so that name\r
+                        // changes refresh the symbol library\r
+                        name),\r
+                name,\r
+                group);\r
+    }\r
+\r
+    public ElementSymbolItem(Resource item, String name, String description, ISymbolGroup group) {\r
+        super(\r
+                AdaptableTriple.make(\r
+                        item,\r
+                        // Prevents infinite recursion which will happen\r
+                        // if SymbolGroup is used as group ID.\r
+                        group instanceof IIdentifiedObject ? ((IIdentifiedObject) group).getId() : group,\r
+                        // Name is in the identification so that name\r
+                        // changes refresh the symbol library\r
+                        name),\r
+                name,\r
+                description,\r
+                group);\r
+    }\r
+\r
+    @Override\r
+    public ElementClass getElementClass(IHintObservable hints) {\r
+        Resource item = adapt(Resource.class);\r
+        RequestProcessor sgrp = SimanticsUI.peekSession();\r
+        if (sgrp == null)\r
+            throw new ProvisionException("No RequestProcessor available for querying an ElementClass for resource " + item);\r
+        try {\r
+            Listener<ElementClass> listener = hints.getHint(ISymbolItem.KEY_ELEMENT_CLASS_LISTENER);\r
+            ElementClass ec = listener == null\r
+                    ? sgrp.syncRequest(createRequest(item, hints))\r
+                    : sgrp.syncRequest(createRequest(item, hints), listener);\r
+            if (ec == null)\r
+                throw new ProvisionException("ElementClass query failed, returned null");\r
+            if (!ec.containsClass(StaticSymbol.class))\r
+                throw new ProvisionException("ElementClass " + ec + " does not provide a StaticSymbol handler");\r
+            return ec;\r
+        } catch (DatabaseException e) {\r
+            throw new ProvisionException(e);\r
+        }\r
+    }\r
+\r
+    private Read<ElementClass> createRequest(Resource item, final IHintObservable hints) {\r
+        return new ResourceRead<ElementClass>(item) {\r
+            @Override\r
+            public ElementClass perform(ReadGraph graph) throws DatabaseException {\r
+                BasicResources.getInstance(graph);\r
+                return graph.syncRequest( DiagramRequests.getElementClass(resource, hints) );\r
+            }\r
+        };\r
+    }\r
+\r
+}\r