X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.objmap2%2Fsrc%2Forg%2Fsimantics%2Fobjmap%2Fgraph%2Frules%2Fdomain%2FMappingUtils.java;h=6f7f9260fde774cd50b59be3b95ae4f5a834425b;hp=dbda44e34f837578692e70d2906b4bf304ed86ba;hb=87d3c60a5c520cca584c54e6bc0fd8c9576141a7;hpb=240fea4f9c0aa8dba1e1af496aebb4157740fa20

diff --git a/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/MappingUtils.java b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/MappingUtils.java
index dbda44e34..6f7f9260f 100644
--- a/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/MappingUtils.java
+++ b/bundles/org.simantics.objmap2/src/org/simantics/objmap/graph/rules/domain/MappingUtils.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2007, 2013 Association for Decentralized Information Management
+ * Copyright (c) 2007, 2013, 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
@@ -8,17 +8,24 @@
  *
  * Contributors:
  *     VTT Technical Research Centre of Finland - initial API and implementation
+ *     Semantum oy - linked list utilities
  *******************************************************************************/
 package org.simantics.objmap.graph.rules.domain;
 
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.List;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.simantics.db.Resource;
 import org.simantics.db.WriteGraph;
+import org.simantics.db.common.utils.ListUtils;
 import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.exception.ManyObjectsForFunctionalRelationException;
+import org.simantics.db.exception.NoSingleResultException;
+import org.simantics.db.exception.ServiceException;
+import org.simantics.layer0.Layer0;
 
 /**
  * Static utility methods for rule implementations.
@@ -90,4 +97,75 @@ public class MappingUtils {
 		return modified;
 	}
 
+	public static boolean synchronizeList(WriteGraph g, Resource element, Resource relation, Resource listType, List<Resource> value, boolean deleteExtraObjects) throws DatabaseException {
+		final Layer0 L0 = Layer0.getInstance(g);
+		
+		// Return value
+		boolean modified = false;
+		
+		// Get the list - create a new one, if necessary
+		Resource currentList = g.getPossibleObject(element, relation);
+		if (currentList == null) {
+			currentList = ListUtils.create(g, listType);
+			g.claim(element, relation, currentList);
+			modified = true;
+		}
+
+		// Synchronize elements
+		List<Resource> currentNodes = ListUtils.getListNodes(g, currentList);
+		int i = 0, j = 0;
+		while (i < currentNodes.size()) {
+			Resource node = currentNodes.get(i);
+			Resource v = g.getSingleObject(node, L0.List_Element);
+			if (j < value.size() && v.equals(value.get(j))) {
+				i++;
+				j++;
+			}
+			else if (value.indexOf(v) > j) {
+				// Insert new element in the middle
+				insertElementBefore(g, L0, node, value.get(j));
+				modified = true;
+				j++;
+			}
+			else {
+				// Remove deleted element
+				if (deleteExtraObjects) g.deny(v);
+				removeNode(g, L0, node);
+				modified = true;
+				i++;
+			}
+		}
+
+		// Add new elements at end
+		while (j < value.size()) {
+			// Add tailing elements
+			insertElementBefore(g, L0, currentList, value.get(j));
+			modified = true;
+			j++;
+		}
+		
+		return modified;
+	}
+
+	private static Resource insertElementBefore(WriteGraph g, final Layer0 L0, Resource node, final Resource val)
+			throws NoSingleResultException, ManyObjectsForFunctionalRelationException, ServiceException {
+		Resource prev = g.getSingleObject(node, L0.List_Previous);
+		g.deny(prev, L0.List_Next, L0.List_Previous, node);
+		
+		Resource newNode = g.newResource();
+		g.claim(newNode, L0.InstanceOf, L0.List_Entry);
+		g.claim(prev, L0.List_Next, L0.List_Previous, newNode);
+		g.claim(newNode, L0.List_Next, L0.List_Previous, node);
+		g.claim(newNode, L0.List_Element, val);
+		return newNode;
+	}
+
+	private static void removeNode(WriteGraph g, final Layer0 L0, Resource node)
+			throws NoSingleResultException, ManyObjectsForFunctionalRelationException, ServiceException {
+		Resource prev = g.getSingleObject(node, L0.List_Previous);
+		Resource next = g.getSingleObject(node, L0.List_Next);
+		g.claim(prev, L0.List_Next, L0.List_Previous, next);
+		g.deny(node);
+	}
+
 }