Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.browsing.ui.graph.impl / src / org / simantics / browsing / ui / graph / impl / GraphEnumerationModifierBase.java

diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/GraphEnumerationModifierBase.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/GraphEnumerationModifierBase.java
new file mode 100644 (file)
index 0000000..4f8167d
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/GraphEnumerationModifierBase.java
@@ -0,0 +1,86 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 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.browsing.ui.graph.impl;\r
+\r
+import org.simantics.browsing.ui.common.modifiers.AbstractEnumerationModifier;\r
+import org.simantics.browsing.ui.common.modifiers.EnumeratedValue;\r
+import org.simantics.browsing.ui.common.modifiers.Enumeration;\r
+import org.simantics.db.Session;\r
+import org.simantics.db.WriteGraph;\r
+import org.simantics.db.common.request.WriteRequest;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.utils.ObjectUtils;\r
+\r
+/**\r
+ * A graph resource based EnumerationModifier utility implementation.\r
+ * \r
+ * @author Tuukka Lehtonen\r
+ */\r
+public abstract class GraphEnumerationModifierBase<T> extends AbstractEnumerationModifier<T> {\r
+\r
+    protected final Session  session;\r
+\r
+    public GraphEnumerationModifierBase(Session session, Enumeration<T> enumeration, T value) {\r
+        this(session, enumeration, enumeration.find(value));\r
+    }\r
+\r
+    public GraphEnumerationModifierBase(Session session, Enumeration<T> enumeration, EnumeratedValue<T> value) {\r
+        super(enumeration, value);\r
+        if (session == null)\r
+            throw new NullPointerException("null session");\r
+        this.session = session;\r
+    }\r
+\r
+    @Override\r
+    protected void modifyWithObject(final T oldEnumObject, final T enumObject) {\r
+        if (ObjectUtils.objectEquals(oldEnumObject, enumObject))\r
+            return;\r
+\r
+        try {\r
+            session.getSession().syncRequest(new WriteRequest() {\r
+                @Override\r
+                public void perform(WriteGraph graph) throws DatabaseException {\r
+//                    System.out.println("old enum object: " + oldEnumObject);\r
+//                    System.out.println("enum object: " + enumObject);\r
+                    modifyWithObject(graph, oldEnumObject, enumObject);\r
+                }\r
+            });\r
+        } catch (DatabaseException e) {\r
+            handleException(e);\r
+        }\r
+    }\r
+\r
+    /**\r
+     * Implement this modifier to perform database modifications.\r
+     * \r
+     * @param graph\r
+     * @param oldEnumObject\r
+     * @param enumObject\r
+     */\r
+    protected abstract void modifyWithObject(WriteGraph graph, T oldEnumObject, T enumObject) throws DatabaseException;\r
+\r
+    /**\r
+     * Client overridable handler for possible exceptions that may occur while\r
+     * performing the database modifications.\r
+     * \r
+     * <p>\r
+     * This default implementation merely forwards the exception as a runtime\r
+     * exception.\r
+     * \r
+     * @param e\r
+     */\r
+    protected void handleException(DatabaseException e) {\r
+        throw new RuntimeException(e);\r
+    }\r
+\r
+\r
+}\r