Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.browsing.ui.swt / src / org / simantics / browsing / ui / swt / IdentifiedStatePersistor.java

diff --git a/bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/IdentifiedStatePersistor.java b/bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/IdentifiedStatePersistor.java
new file mode 100644 (file)
index 0000000..b741253
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/IdentifiedStatePersistor.java
@@ -0,0 +1,103 @@
+package org.simantics.browsing.ui.swt;\r
+\r
+import java.io.File;\r
+import java.nio.file.Files;\r
+import java.nio.file.Path;\r
+import java.util.Arrays;\r
+import java.util.Collections;\r
+import java.util.List;\r
+\r
+import org.simantics.browsing.ui.ExplorerState;\r
+import org.simantics.browsing.ui.NodeContext;\r
+import org.simantics.browsing.ui.StatePersistor;\r
+import org.simantics.databoard.util.StringUtil;\r
+import org.simantics.db.common.utils.Logger;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class IdentifiedStatePersistor implements StatePersistor {\r
+\r
+       protected final String id;\r
+\r
+       public IdentifiedStatePersistor(String id) {\r
+               this.id = id;\r
+       }\r
+\r
+       @Override\r
+       public ExplorerState deserialize(File stateLocation, NodeContext root) {\r
+               return stateLocation == null ? ExplorerState.EMPTY\r
+                               : deserialize(getMementoPath(stateLocation, root));\r
+       }\r
+\r
+       @Override\r
+       public void serialize(File stateLocation, NodeContext root, ExplorerState state) {\r
+               if (stateLocation == null || root == null)\r
+                       return;\r
+               try {\r
+                       GraphExplorerStateBean bean = toStateBean(state, root);\r
+                       Path memento = getMementoPath(stateLocation, root);\r
+                       if (bean != null && memento != null)\r
+                               Files.write(memento, bean.serialize());\r
+               } catch (Throwable t) {\r
+                       Logger.defaultLogError(t);\r
+               }\r
+       }\r
+\r
+       protected ExplorerState deserialize(Path path) {\r
+               if (path == null || !Files.exists(path))\r
+                       return ExplorerState.EMPTY;\r
+               try {\r
+                       GraphExplorerStateBean stateBean = new GraphExplorerStateBean();\r
+                       stateBean.deserialize( Files.readAllBytes(path) );\r
+                       return toState(stateBean);\r
+               } catch (Throwable t) {\r
+                       Logger.defaultLogError(t);\r
+                       return ExplorerState.EMPTY;\r
+               }\r
+       }\r
+\r
+       protected NodeContext[] toNodeContexts(GraphExplorerStateNodeBean[] beans) throws Exception {\r
+               return NodeContext.NONE;\r
+       }\r
+\r
+       protected List<NodeContext> toNodeContextList(GraphExplorerStateNodeBean[] beans) throws Exception {\r
+               return beans.length == 0 ? Collections.<NodeContext>emptyList()\r
+                               : Arrays.asList(toNodeContexts(beans));\r
+       }\r
+\r
+       protected GraphExplorerStateNodeBean[] toNodeBeans(NodeContext[] contexts) {\r
+               return GraphExplorerStateNodeBean.NONE;\r
+       }\r
+\r
+       protected ExplorerState toState(GraphExplorerStateBean stateBean) throws Exception {\r
+               return new ExplorerState(\r
+                               toNodeContexts(stateBean.topNodePath),\r
+                               stateBean.topNodePathChildIndexes,\r
+                               toNodeContextList(stateBean.expandedNodes),\r
+                               stateBean.columnWidths);\r
+       }\r
+\r
+       /**\r
+        * @param state\r
+        *            the {@link ExplorerState} to transform into a\r
+        *            {@link GraphExplorerStateBean}\r
+        * @param root\r
+        *            the input root node context that was used to initialize the\r
+        *            explorer state\r
+        * @return\r
+        */\r
+       protected GraphExplorerStateBean toStateBean(ExplorerState state, NodeContext root) {\r
+               GraphExplorerStateBean ib = new GraphExplorerStateBean();\r
+               ib.topNodePath = toNodeBeans(state.topNodePath);\r
+               ib.topNodePathChildIndexes = state.topNodePathChildIndex;\r
+               ib.expandedNodes = toNodeBeans(state.expandedNodes.toArray(NodeContext.NONE));\r
+               ib.columnWidths = state.columnWidths;\r
+               return ib;\r
+       }\r
+\r
+       protected Path getMementoPath(File stateLocation, NodeContext root) {\r
+               return stateLocation.toPath().resolve(StringUtil.escapeToFileName(id) + ".ge");\r
+       }\r
+\r
+}
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