-/*******************************************************************************\r
- * Copyright (c) 2007, 2013 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.objmap.forward;\r
-\r
-import org.simantics.db.ReadGraph;\r
-import org.simantics.objmap.exceptions.MappingException;\r
-\r
-public interface IForwardMappingRule<Domain, Range> {\r
- /**\r
- * Modifies the range element so that it corresponds to the domain element.\r
- * @param g read transaction\r
- * @param map unidirectional view of the current mapping\r
- * @param domainElement the domain element that corresponds to the range element\r
- * @param rangeElement the range element that is updated\r
- * @return true if the rule made some modifications\r
- * @throws MappingException\r
- */\r
- boolean updateRange(ReadGraph graph, IForwardMapping<Domain, Range> mapping, Domain domainElement, Range rangeElement) throws MappingException; \r
- void createRange(ReadGraph graph, IForwardMapping<Domain, Range> mapping, Domain domainElement, Range rangeElement) throws MappingException;\r
-}\r
+/*******************************************************************************
+ * Copyright (c) 2007, 2013 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:
+ * VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.objmap.forward;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.objmap.exceptions.MappingException;
+
+public interface IForwardMappingRule<Domain, Range> {
+ /**
+ * Check whether a range element needs to be updated due to a change in the range element, without modifying the range element.
+ */
+ boolean checkChanges(ReadGraph graph, IForwardMapping<Domain, Range> mapping, Domain domainElement, Range rangeElement) throws MappingException;
+
+ /**
+ * Modifies the range element so that it corresponds to the domain element.
+ * @param g read transaction
+ * @param map unidirectional view of the current mapping
+ * @param domainElement the domain element that corresponds to the range element
+ * @param rangeElement the range element that is updated
+ * @return true if the rule made some modifications
+ * @throws MappingException
+ */
+ boolean updateRange(ReadGraph graph, IForwardMapping<Domain, Range> mapping, Domain domainElement, Range rangeElement) throws MappingException;
+ void createRange(ReadGraph graph, IForwardMapping<Domain, Range> mapping, Domain domainElement, Range rangeElement) throws MappingException;
+}