X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.browsing.ui.graph.impl%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fgraph%2Fimpl%2FEvaluatorViewpoint.java;fp=bundles%2Forg.simantics.browsing.ui.graph.impl%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fgraph%2Fimpl%2FEvaluatorViewpoint.java;h=fa4308424b21a52f02ef820d3214eb48d8744e45;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08

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
index 000000000..fa4308424
--- /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;
+
+import java.util.Collection;
+
+import org.simantics.browsing.ui.BuiltinKeys.ViewpointKey;
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.browsing.ui.PrimitiveQueryUpdater;
+import org.simantics.browsing.ui.model.browsecontexts.BrowseContext;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.common.request.UniqueRead;
+import org.simantics.db.exception.DatabaseException;
+
+public class EvaluatorViewpoint extends LazyViewpoint {
+
+	final BrowseContext browseContext;
+	final boolean useNodeBrowseContexts;
+	final boolean useNodeActionContexts;
+	
+    public EvaluatorViewpoint(PrimitiveQueryUpdater updater, NodeContext context, ViewpointKey key,
+    		BrowseContext browseContext, boolean useNodeBrowseContexts, boolean useNodeActionContexts) {
+		super(updater, context, key);
+		this.browseContext = browseContext;
+		this.useNodeActionContexts = useNodeActionContexts;
+		this.useNodeBrowseContexts = useNodeBrowseContexts;
+	}
+
+	@Override
+    public Boolean hasChildren(ReadGraph graph) throws DatabaseException {
+        return BrowseContext.get(graph,context,browseContext,useNodeBrowseContexts).hasChildren(graph, context);
+    }
+
+    @Override
+    public NodeContext[] children(ReadGraph graph) throws DatabaseException {
+    	boolean oldSynchronous = graph.setSynchronous(false); 
+    	try {
+    		// This intermediate query is a work-around for a listening
+    		// bug where old dependencies are not correctly pruned for listened entries
+    		return graph.syncRequest(new UniqueRead<NodeContext[]>() {
+
+				@Override
+				public NodeContext[] perform(ReadGraph graph) throws DatabaseException {
+		    		BrowseContext bc = BrowseContext.get(graph,context,browseContext,useNodeBrowseContexts);
+		    		Collection<NodeContext> children = bc.getChildren(graph, context);
+		    		children = BrowseContext.augment(graph, bc, children, useNodeActionContexts);
+		    		return children.toArray(new NodeContext[children.size()]);
+				}
+    			
+    		});
+    	} finally {
+    		graph.setSynchronous(oldSynchronous);
+    	}
+    }
+    
+    public String toString() {
+    	return "EvaluatorViewpoint[" + browseContext + "] " + context;
+    }
+    
+}
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