Rid TypicalPropertyTester of database read transactions

[simantics/platform.git] / bundles / org.simantics.db.common / src / org / simantics / db / common / request / ResourceSetURIs.java

diff --git a/bundles/org.simantics.db.common/src/org/simantics/db/common/request/ResourceSetURIs.java b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/ResourceSetURIs.java
new file mode 100644 (file)
index 0000000..0cc29e1
--- /dev/null
+++ b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/ResourceSetURIs.java
@@ -0,0 +1,48 @@
+/*******************************************************************************
+ * Copyright (c) 2019 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.common.request;
+
+import java.util.Collections;
+import java.util.Set;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.exception.DatabaseException;
+
+import gnu.trove.set.hash.THashSet;
+
+/**
+ * @author Tuukka Lehtonen
+ * @since 1.41.0, 1.35.2
+ */
+public class ResourceSetURIs extends UnaryRead<Set<Resource>, Set<String>> {
+
+    public ResourceSetURIs(Set<Resource> set) {
+        super(set);
+    }
+
+    @Override
+    public Set<String> perform(ReadGraph graph) throws DatabaseException {
+        if (parameter == null || parameter.isEmpty())
+            return Collections.emptySet();
+
+        Set<String> result = new THashSet<String>(parameter.size());
+        for (Resource r : parameter) {
+            String uri = graph.getPossibleURI(r);
+            if (uri != null)
+                result.add(uri);
+        }
+
+        return result;
+    }
+
+}
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