Manually merged commit f2f1f3fe changes to release/1.28.1 branch.

[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / util / Layer0Utils.java

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 538f22478d00f1708a4b0c89e2059adae754f1a4..3a24102b25ace39a7760022da4bee0b22c5b36c4 100644 (file)
--- 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;
@@ -1349,6 +1350,18 @@ public class Layer0Utils {
        return null;
     }
     
+    public static Resource getPossiblePredicateByLabel(ReadGraph graph, Resource instance, String predicateName) throws DatabaseException {
+       Layer0 L0 = Layer0.getInstance(graph);
+       for(Resource type : graph.getPrincipalTypes(instance)) {
+               Map<String, Resource> domainOf = getDomainOf(graph, type);
+               for(Resource r : domainOf.values()) {
+                       String label = graph.getPossibleRelatedValue(r, L0.HasLabel, Bindings.STRING);
+                       if(predicateName.equals(label))
+                               return r;
+               }
+       }
+       return null;
+    }
     
     public static void claimLiteralDataboard(WriteGraph graph, Resource container, Resource property, String valueText) throws DatabaseException {
 
@@ -1366,4 +1379,47 @@ public class Layer0Utils {
        
     }
 
+    /**
+     * Adds a random {@link GUID} as a value for <code>L0.identifier</code>
+     * 
+     * @param graph
+     * @param component
+     *            for which the identifier is added
+     * @param add
+     *            <code>true</code> to invoke addLiteral, <code>false</code> 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 <code>true</code> if the identifier was renewed, <code>false</code>
+     *         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;
+    }
+
 }