X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.db.layer0%2Fsrc%2Forg%2Fsimantics%2Fdb%2Flayer0%2Futil%2FLayer0Utils.java;h=3a24102b25ace39a7760022da4bee0b22c5b36c4;hb=refs%2Fchanges%2F66%2F1266%2F1;hp=adc51c16d88ef0f74f1f849f421e9156398c69f1;hpb=738abdf21b01a265c08f40c1e0f601406c58666e;p=simantics%2Fplatform.git
diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/util/Layer0Utils.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/util/Layer0Utils.java
index adc51c16d..3a24102b2 100644
--- a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/util/Layer0Utils.java
+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/util/Layer0Utils.java
@@ -54,6 +54,7 @@ import org.simantics.databoard.type.StringType;
import org.simantics.databoard.type.UnionType;
import org.simantics.databoard.type.VariantType;
import org.simantics.databoard.util.ObjectUtils;
+import org.simantics.datatypes.literal.GUID;
import org.simantics.db.ChangeSetIdentifier;
import org.simantics.db.Operation;
import org.simantics.db.ReadGraph;
@@ -1378,4 +1379,47 @@ public class Layer0Utils {
}
+ /**
+ * Adds a random {@link GUID} as a value for L0.identifier
+ *
+ * @param graph
+ * @param component
+ * for which the identifier is added
+ * @param add
+ * true
to invoke addLiteral, false
to
+ * invoke claimLiteral
+ * @throws DatabaseException
+ */
+ public static void claimNewIdentifier(WriteGraph graph, Resource component, boolean add) throws DatabaseException {
+ Layer0 L0 = Layer0.getInstance(graph);
+ GUID guid = GUID.random();
+ if (add)
+ graph.addLiteral(component, L0.identifier, L0.identifier_Inverse, L0.GUID, guid, GUID.BINDING);
+ else
+ graph.claimLiteral(component, L0.identifier, L0.identifier_Inverse, L0.GUID, guid, GUID.BINDING);
+ }
+
+ /**
+ * Sets a new random unique identifier for the specified entity if it already
+ * has an identifier. If the entity does not have a previous identifier, nothing
+ * is done.
+ *
+ * @param graph
+ * @param entity
+ * for which the identifier is added
+ * @return true
if the identifier was renewed, false
+ * otherwise
+ * @throws DatabaseException
+ * @see {@link #claimNewIdentifier(WriteGraph, Resource, boolean)}
+ */
+ public static boolean renewIdentifier(WriteGraph graph, Resource entity) throws DatabaseException {
+ Layer0 L0 = Layer0.getInstance(graph);
+ Statement stm = graph.getPossibleStatement(entity, L0.identifier);
+ if (stm != null) {
+ graph.claimValue(stm.getObject(), GUID.random(), GUID.BINDING);
+ return true;
+ }
+ return false;
+ }
+
}