Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/EvaluatorViewpoint.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/EvaluatorViewpoint.java
new file mode 100644 (file)
index 0000000..fa43084
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/EvaluatorViewpoint.java
@@ -0,0 +1,58 @@
+package org.simantics.browsing.ui.graph.impl;\r
+\r
+import java.util.Collection;\r
+\r
+import org.simantics.browsing.ui.BuiltinKeys.ViewpointKey;\r
+import org.simantics.browsing.ui.NodeContext;\r
+import org.simantics.browsing.ui.PrimitiveQueryUpdater;\r
+import org.simantics.browsing.ui.model.browsecontexts.BrowseContext;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.common.request.UniqueRead;\r
+import org.simantics.db.exception.DatabaseException;\r
+\r
+public class EvaluatorViewpoint extends LazyViewpoint {\r
+\r
+       final BrowseContext browseContext;\r
+       final boolean useNodeBrowseContexts;\r
+       final boolean useNodeActionContexts;\r
+       \r
+    public EvaluatorViewpoint(PrimitiveQueryUpdater updater, NodeContext context, ViewpointKey key,\r
+               BrowseContext browseContext, boolean useNodeBrowseContexts, boolean useNodeActionContexts) {\r
+               super(updater, context, key);\r
+               this.browseContext = browseContext;\r
+               this.useNodeActionContexts = useNodeActionContexts;\r
+               this.useNodeBrowseContexts = useNodeBrowseContexts;\r
+       }\r
+\r
+       @Override\r
+    public Boolean hasChildren(ReadGraph graph) throws DatabaseException {\r
+        return BrowseContext.get(graph,context,browseContext,useNodeBrowseContexts).hasChildren(graph, context);\r
+    }\r
+\r
+    @Override\r
+    public NodeContext[] children(ReadGraph graph) throws DatabaseException {\r
+       boolean oldSynchronous = graph.setSynchronous(false); \r
+       try {\r
+               // This intermediate query is a work-around for a listening\r
+               // bug where old dependencies are not correctly pruned for listened entries\r
+               return graph.syncRequest(new UniqueRead<NodeContext[]>() {\r
+\r
+                               @Override\r
+                               public NodeContext[] perform(ReadGraph graph) throws DatabaseException {\r
+                               BrowseContext bc = BrowseContext.get(graph,context,browseContext,useNodeBrowseContexts);\r
+                               Collection<NodeContext> children = bc.getChildren(graph, context);\r
+                               children = BrowseContext.augment(graph, bc, children, useNodeActionContexts);\r
+                               return children.toArray(new NodeContext[children.size()]);\r
+                               }\r
+                       \r
+               });\r
+       } finally {\r
+               graph.setSynchronous(oldSynchronous);\r
+       }\r
+    }\r
+    \r
+    public String toString() {\r
+       return "EvaluatorViewpoint[" + browseContext + "] " + context;\r
+    }\r
+    \r
+}
\ No newline at end of file