--- /dev/null
+/*******************************************************************************\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.issues.common;\r
+\r
+import gnu.trove.set.hash.THashSet;\r
+\r
+import java.util.Set;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.common.request.UnaryRead;\r
+import org.simantics.db.common.utils.ListUtils;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.layer0.variable.Variable;\r
+import org.simantics.issues.ontology.IssueResource;\r
+\r
+/**\r
+ * A request for calculating the set of issue context resources for the\r
+ * specified set of issue variables.\r
+ * \r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class IssueContexts extends UnaryRead<Set<Variable>, Set<Resource>> {\r
+\r
+ public IssueContexts(Set<Variable> variables) {\r
+ super(variables);\r
+ }\r
+\r
+ @Override\r
+ public Set<Resource> perform(ReadGraph graph) throws DatabaseException {\r
+ IssueResource ISSUE = IssueResource.getInstance(graph);\r
+ Set<Resource> result = new THashSet<Resource>(parameter.size());\r
+ for(Variable issue : parameter) {\r
+ Resource issueResource = issue.getRepresents(graph);\r
+ result.addAll(graph.getObjects(issueResource, ISSUE.Issue_HasContext));\r
+ Resource list = graph.getPossibleObject(issueResource, ISSUE.Issue_HasContexts);\r
+ if(list != null) result.addAll(ListUtils.toList(graph, list));\r
+ }\r
+ return result;\r
+ }\r
+\r
+}\r