Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.browsing.ui.graph.impl / src / org / simantics / browsing / ui / graph / impl / contribution / FinalCheckedStateContributionImpl.java

diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/FinalCheckedStateContributionImpl.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/FinalCheckedStateContributionImpl.java
new file mode 100644 (file)
index 0000000..132d9ae
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/FinalCheckedStateContributionImpl.java
@@ -0,0 +1,119 @@
+/*******************************************************************************\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.browsing.ui.graph.impl.contribution;\r
+\r
+import org.simantics.browsing.ui.BuiltinKeys;\r
+import org.simantics.browsing.ui.BuiltinKeys.CheckedStateKey;\r
+import org.simantics.browsing.ui.CheckedState;\r
+import org.simantics.browsing.ui.DataSource;\r
+import org.simantics.browsing.ui.NodeContext;\r
+import org.simantics.browsing.ui.PrimitiveQueryUpdater;\r
+import org.simantics.browsing.ui.graph.impl.request.ResourceQuery;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.procedure.Listener;\r
+import org.simantics.db.procedure.Procedure;\r
+import org.simantics.utils.ui.ErrorLogger;\r
+\r
+public abstract class FinalCheckedStateContributionImpl {\r
+\r
+    protected final PrimitiveQueryUpdater       updater;\r
+    private final ResourceQuery<CheckedState> labelQuery;\r
+    private final Procedure<CheckedState>      procedure;\r
+\r
+    final private NodeContext                context;\r
+    final private BuiltinKeys.CheckedStateKey    key;\r
+    \r
+    private CheckedState state = null;\r
+\r
+    public Object getIdentity(CheckedStateKey key) {\r
+        return key;\r
+    }\r
+\r
+    public CheckedState getState() {\r
+       \r
+       if (state == null) {\r
+\r
+            final DataSource<ReadGraph> source = updater.getDataSource(ReadGraph.class);\r
+            assert(source != null);\r
+\r
+            source.schedule(graph -> {\r
+                if(procedure instanceof Listener<?>)\r
+                    graph.asyncRequest(labelQuery, (Listener<CheckedState>)procedure);\r
+                else\r
+                    graph.asyncRequest(labelQuery, procedure);\r
+            });\r
+               \r
+       }\r
+       \r
+       return state;\r
+       \r
+    }\r
+    \r
+    public FinalCheckedStateContributionImpl(final PrimitiveQueryUpdater updater, final NodeContext context, final CheckedStateKey key) {\r
+\r
+        this.updater = updater;\r
+        this.context = context;\r
+        this.key = key;\r
+\r
+        labelQuery = new ResourceQuery<CheckedState>(getIdentity(key), context) {\r
+\r
+            @Override\r
+            public CheckedState perform(ReadGraph graph) throws DatabaseException {\r
+                try {\r
+                       return getState(graph, context);\r
+                } catch (DatabaseException e) {\r
+                    throw e;\r
+                } catch (Throwable t) {\r
+                    ErrorLogger.defaultLogError("LazyGraphLabeler.labelQuery produced unexpected exception.", t);\r
+                    return null;\r
+                }\r
+            }\r
+\r
+            @Override\r
+            public String toString() {\r
+                return FinalCheckedStateContributionImpl.this + " with context " + context;\r
+            }\r
+\r
+        };\r
+\r
+        procedure = createProcedure();\r
+\r
+    }\r
+\r
+    protected Procedure<CheckedState> createProcedure() {\r
+\r
+        return new Procedure<CheckedState>() {\r
+\r
+            @Override\r
+            public void execute(CheckedState result) {\r
+                replaceResult(result);\r
+            }\r
+\r
+            @Override\r
+            public void exception(Throwable t) {\r
+                ErrorLogger.defaultLogError("LazyContributionImpl.childQuery failed, see exception for details.", t);\r
+            }\r
+\r
+        };\r
+\r
+    }\r
+\r
+    protected void replaceResult(CheckedState result) {\r
+        state = result;\r
+        updater.scheduleReplace(context, key, state);\r
+    }\r
+\r
+    abstract public CheckedState getState(ReadGraph graph, NodeContext context) throws DatabaseException;\r
+    \r
+\r
+}\r