1 /*******************************************************************************
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2 * Copyright (c) 2015 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * Semantum Oy - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.browsing.ui.model.queries;
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14 import java.util.Collections;
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16 import org.simantics.browsing.ui.BuiltinKeys;
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17 import org.simantics.browsing.ui.NodeContext;
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18 import org.simantics.browsing.ui.model.actions.ActionBrowseContext;
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19 import org.simantics.browsing.ui.model.browsecontexts.ActionBrowseContextRequest;
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20 import org.simantics.db.ReadGraph;
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21 import org.simantics.db.Resource;
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22 import org.simantics.db.common.procedure.adapter.TransientCacheAsyncListener;
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23 import org.simantics.db.common.request.Queries;
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24 import org.simantics.db.common.request.UnaryRead;
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25 import org.simantics.db.exception.DatabaseException;
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26 import org.simantics.db.layer0.adapter.Remover;
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27 import org.simantics.project.ontology.ProjectResource;
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30 * @author Tuukka Lehtonen
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33 public class IsNodeContextRemovable extends UnaryRead<NodeContext, Boolean> {
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35 public IsNodeContextRemovable(NodeContext context) {
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40 public Boolean perform(ReadGraph graph) throws DatabaseException {
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41 boolean result = false;
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43 ActionBrowseContext defaultContext = graph.syncRequest(
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44 new ActionBrowseContextRequest(Collections.singleton(ProjectResource.getInstance(graph).ProjectActionContext)),
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45 TransientCacheAsyncListener.<ActionBrowseContext>instance());
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46 ActionBrowseContext browseContext = ActionBrowseContext.get(graph, parameter, defaultContext);
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47 if (browseContext != null && !browseContext.canRemove(graph, parameter))
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50 } catch (DatabaseException e) {
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54 Object input = parameter.getConstant(BuiltinKeys.INPUT);
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55 if (result && input instanceof Resource) {
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56 Remover remover = graph.syncRequest(Queries.adapt((Resource) input, Remover.class, true));
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57 if (remover != null)
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58 return remover.canRemove(graph, null) == null;
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