bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/IdentifiedStatePersistor.java

   1 package org.simantics.browsing.ui.swt;\r
   2 \r
   3 import java.io.File;\r
   4 import java.nio.file.Files;\r
   5 import java.nio.file.Path;\r
   6 import java.util.Arrays;\r
   7 import java.util.Collections;\r
   8 import java.util.List;\r
   9 \r
  10 import org.simantics.browsing.ui.ExplorerState;\r
  11 import org.simantics.browsing.ui.NodeContext;\r
  12 import org.simantics.browsing.ui.StatePersistor;\r
  13 import org.simantics.databoard.util.StringUtil;\r
  14 import org.simantics.db.common.utils.Logger;\r
  15 \r
  16 /**\r
  17  * @author Tuukka Lehtonen\r
  18  */\r
  19 public class IdentifiedStatePersistor implements StatePersistor {\r
  20 \r
  21         protected final String id;\r
  22 \r
  23         public IdentifiedStatePersistor(String id) {\r
  24                 this.id = id;\r
  25         }\r
  26 \r
  27         @Override\r
  28         public ExplorerState deserialize(File stateLocation, NodeContext root) {\r
  29                 return stateLocation == null ? ExplorerState.EMPTY\r
  30                                 : deserialize(getMementoPath(stateLocation, root));\r
  31         }\r
  32 \r
  33         @Override\r
  34         public void serialize(File stateLocation, NodeContext root, ExplorerState state) {\r
  35                 if (stateLocation == null || root == null)\r
  36                         return;\r
  37                 try {\r
  38                         GraphExplorerStateBean bean = toStateBean(state, root);\r
  39                         Path memento = getMementoPath(stateLocation, root);\r
  40                         if (bean != null && memento != null)\r
  41                                 Files.write(memento, bean.serialize());\r
  42                 } catch (Throwable t) {\r
  43                         Logger.defaultLogError(t);\r
  44                 }\r
  45         }\r
  46 \r
  47         protected ExplorerState deserialize(Path path) {\r
  48                 if (path == null || !Files.exists(path))\r
  49                         return ExplorerState.EMPTY;\r
  50                 try {\r
  51                         GraphExplorerStateBean stateBean = new GraphExplorerStateBean();\r
  52                         stateBean.deserialize( Files.readAllBytes(path) );\r
  53                         return toState(stateBean);\r
  54                 } catch (Throwable t) {\r
  55                         Logger.defaultLogError(t);\r
  56                         return ExplorerState.EMPTY;\r
  57                 }\r
  58         }\r
  59 \r
  60         protected NodeContext[] toNodeContexts(GraphExplorerStateNodeBean[] beans) throws Exception {\r
  61                 return NodeContext.NONE;\r
  62         }\r
  63 \r
  64         protected List<NodeContext> toNodeContextList(GraphExplorerStateNodeBean[] beans) throws Exception {\r
  65                 return beans.length == 0 ? Collections.<NodeContext>emptyList()\r
  66                                 : Arrays.asList(toNodeContexts(beans));\r
  67         }\r
  68 \r
  69         protected GraphExplorerStateNodeBean[] toNodeBeans(NodeContext[] contexts) {\r
  70                 return GraphExplorerStateNodeBean.NONE;\r
  71         }\r
  72 \r
  73         protected ExplorerState toState(GraphExplorerStateBean stateBean) throws Exception {\r
  74                 return new ExplorerState(\r
  75                                 toNodeContexts(stateBean.topNodePath),\r
  76                                 stateBean.topNodePathChildIndexes,\r
  77                                 toNodeContextList(stateBean.expandedNodes),\r
  78                                 stateBean.columnWidths);\r
  79         }\r
  80 \r
  81         /**\r
  82          * @param state\r
  83          *            the {@link ExplorerState} to transform into a\r
  84          *            {@link GraphExplorerStateBean}\r
  85          * @param root\r
  86          *            the input root node context that was used to initialize the\r
  87          *            explorer state\r
  88          * @return\r
  89          */\r
  90         protected GraphExplorerStateBean toStateBean(ExplorerState state, NodeContext root) {\r
  91                 GraphExplorerStateBean ib = new GraphExplorerStateBean();\r
  92                 ib.topNodePath = toNodeBeans(state.topNodePath);\r
  93                 ib.topNodePathChildIndexes = state.topNodePathChildIndex;\r
  94                 ib.expandedNodes = toNodeBeans(state.expandedNodes.toArray(NodeContext.NONE));\r
  95                 ib.columnWidths = state.columnWidths;\r
  96                 return ib;\r
  97         }\r
  98 \r
  99         protected Path getMementoPath(File stateLocation, NodeContext root) {\r
 100                 return stateLocation.toPath().resolve(StringUtil.escapeToFileName(id) + ".ge");\r
 101         }\r
 102 \r
 103 }