bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/variable/ProxyVariables.java

   1 package org.simantics.db.layer0.variable;\r
   2 \r
   3 import org.simantics.db.ReadGraph;\r
   4 import org.simantics.db.exception.DatabaseException;\r
   5 \r
   6 public class ProxyVariables {\r
   7         \r
   8         public static Variable inputVariable(ReadGraph graph, Variable context) throws DatabaseException {\r
   9         Variable session = graph.syncRequest(new ProxySessionRequest(context));\r
  10         if(session == null) return null;\r
  11         String uri = session.getPossiblePropertyValue(graph, "inputURI");\r
  12         if(uri == null) {\r
  13                 // TODO HAXX - Please fix this\r
  14                 // we have no URI so this probably means that someone has inserted a non-session \r
  15                 // into the proxy variable => return that instead\r
  16                 return session;\r
  17         }\r
  18         return Variables.getVariable(graph, uri);\r
  19         }\r
  20 \r
  21         public static Variable sessionVariable(ReadGraph graph, Variable self) throws DatabaseException {\r
  22                 return graph.syncRequest(new ProxySessionRequest(self));\r
  23         }\r
  24 \r
  25         public static Variable makeProxyVariable(ReadGraph graph, Variable base, Variable input) throws DatabaseException {\r
  26                 \r
  27         base = base.getChild(graph, ProxyChildVariable.CONTEXT_BEGIN);\r
  28         String path = input.getURI(graph).substring("http:/".length());\r
  29         base = base.browse(graph, path);\r
  30         return base.getChild(graph, ProxyChildVariable.CONTEXT_END);\r
  31         \r
  32         }\r
  33         \r
  34     public static Variable proxySessionVariable(ReadGraph graph, Variable variable) throws DatabaseException {\r
  35         \r
  36         try {\r
  37                 \r
  38                 Variable child = variable.getParent(graph);\r
  39                 Variable parent = child.getParent(graph);\r
  40 \r
  41                 if(parent instanceof ProxyChildVariable) {\r
  42                         Variable var = ((ProxyChildVariable)parent).other();\r
  43                         if(var.getParent(graph) == null) {\r
  44                                 return null;\r
  45                         }\r
  46                         return var;\r
  47                 } else {\r
  48                         Variable input = parent.getPossiblePropertyValue(graph, "session");\r
  49                         if(input == null) {\r
  50                             System.out.println("null input for: " + parent.getURI(graph));\r
  51                         }\r
  52                         return input;\r
  53                 }\r
  54         } catch (Throwable t) {\r
  55             t.printStackTrace();\r
  56             return null;\r
  57         }\r
  58 \r
  59     }\r
  60 \r
  61     public static Variable proxyVariableBase(ReadGraph graph, Variable variable) throws DatabaseException {\r
  62         \r
  63         try {\r
  64                 \r
  65                 Variable parent = variable.getParent(graph);\r
  66                 if(parent == null) return null;\r
  67                 \r
  68                 if(parent instanceof ProxyChildVariable) {\r
  69                         return ((ProxyChildVariable)parent).base();\r
  70                 } else {\r
  71                         return proxyVariableBase(graph, parent);\r
  72                 }\r
  73                 \r
  74         } catch (Throwable t) {\r
  75             t.printStackTrace();\r
  76             return null;\r
  77         }\r
  78 \r
  79     }\r
  80 \r
  81     public static Variable proxyVariableInput(ReadGraph graph, Variable variable) throws DatabaseException {\r
  82 \r
  83                 if(variable instanceof ProxyChildVariable) {\r
  84                         Variable var = ((ProxyChildVariable)variable).other();\r
  85                         if(var.getParent(graph) == null) {\r
  86                                 return null;\r
  87                         }\r
  88                         return var;\r
  89                 } else {\r
  90                         Variable parent = variable.getParent(graph);\r
  91                         if(parent == null) return null;\r
  92                         else return proxyVariableBase(graph, parent);\r
  93                 }\r
  94         \r
  95     }\r
  96     \r
  97     public static Variable proxyVariableRoot(ReadGraph graph, Variable variable) throws DatabaseException {\r
  98         \r
  99         try {\r
 100                 \r
 101                 Variable parent = variable.getParent(graph);\r
 102                 if(parent == null) return null;\r
 103                 \r
 104                 if(parent instanceof ProxyChildVariable) {\r
 105                         return variable;\r
 106                 } else {\r
 107                         return proxyVariableRoot(graph, parent);\r
 108                 }\r
 109                 \r
 110         } catch (Throwable t) {\r
 111             t.printStackTrace();\r
 112             return null;\r
 113         }\r
 114 \r
 115     }\r
 116 \r
 117     public static boolean isProxy(ReadGraph graph, Variable variable) throws DatabaseException {\r
 118         return proxyVariableRoot(graph, variable) != null;\r
 119     }\r
 120 \r
 121     \r
 122 }\r