1 package org.simantics.browsing.ui.model.browsecontexts;
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3 import java.util.Collection;
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5 import org.simantics.browsing.ui.BuiltinKeys;
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6 import org.simantics.browsing.ui.NodeContext;
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7 import org.simantics.db.ReadGraph;
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8 import org.simantics.db.Resource;
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9 import org.simantics.db.common.request.PossibleIndexRoot;
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10 import org.simantics.db.common.request.UnaryRead;
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11 import org.simantics.db.exception.DatabaseException;
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12 import org.simantics.db.layer0.variable.Variable;
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14 public class ResolveBrowseContext extends UnaryRead<NodeContext,BrowseContext> {
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16 public ResolveBrowseContext(NodeContext parameter) {
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20 private Resource getPossibleResource(ReadGraph graph) throws DatabaseException {
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21 Object input = parameter.getConstant(BuiltinKeys.INPUT);
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22 if(input instanceof Resource) return (Resource)input;
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23 else if (input instanceof Variable) return ((Variable)input).getPossibleRepresents(graph);
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27 private String getPossibleUIContext() {
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28 return parameter.getConstant(BuiltinKeys.UI_CONTEXT);
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32 public BrowseContext perform(ReadGraph graph) throws DatabaseException {
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34 Resource resource = getPossibleResource(graph);
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35 if(resource == null) return null;
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37 Resource indexRoot = graph.syncRequest(new PossibleIndexRoot(resource));
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38 if(indexRoot == null) return null;
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40 Collection<Resource> contexts = graph.syncRequest(new ContributedBrowseContexts(indexRoot, resource, getPossibleUIContext()));
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42 if(contexts.isEmpty()) return null;
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44 return graph.syncRequest(new BrowseContextRequest(contexts));
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