net.mograsim.logic.model/src/net/mograsim/logic/model/serializing/CodeSnippetSupplier.java

   1 package net.mograsim.logic.model.serializing;
   2
   3 import java.io.IOException;
   4 import java.io.InputStream;
   5 import java.util.HashMap;
   6 import java.util.Map;
   7
   8 import net.mograsim.logic.model.serializing.snippets.HighLevelStateHandler;
   9 import net.mograsim.logic.model.serializing.snippets.Renderer;
  10 import net.mograsim.logic.model.serializing.snippets.SnippetSupplier;
  11 import net.mograsim.logic.model.serializing.snippets.highlevelstatehandlers.DefaultHighLevelStateHandler;
  12 import net.mograsim.logic.model.serializing.snippets.outlinerenderers.DefaultOutlineRenderer;
  13 import net.mograsim.logic.model.serializing.snippets.symbolrenderers.DefaultSymbolRenderer;
  14 import net.mograsim.logic.model.util.JsonHandler;
  15
  16 public class CodeSnippetSupplier<S>
  17 {
  18         // public static members
  19         public static final CodeSnippetSupplier<Renderer> symbolRendererSupplier;
  20         public static final CodeSnippetSupplier<Renderer> outlineRendererSupplier;
  21         public static final CodeSnippetSupplier<HighLevelStateHandler> highLevelStateHandlerSupplier;
  22
  23         static
  24         {
  25                 symbolRendererSupplier = new CodeSnippetSupplier<>(SnippetSupplier.create(Void.class, DefaultSymbolRenderer::new));
  26                 outlineRendererSupplier = new CodeSnippetSupplier<>(SnippetSupplier.create(Void.class, DefaultOutlineRenderer::new));
  27                 highLevelStateHandlerSupplier = new CodeSnippetSupplier<>(SnippetSupplier.create(Void.class, DefaultHighLevelStateHandler::new));
  28         }
  29
  30         // per-instance members
  31
  32         private final Map<String, String> standardSnippetIDClassNames = new HashMap<>();
  33         private final Map<String, SnippetSupplier<?, S>> snippetSuppliersForClassNames = new HashMap<>();
  34         private final SnippetSupplier<?, S> defaultSnippetSupplier;
  35
  36         private CodeSnippetSupplier(SnippetSupplier<?, S> defaultSnippetSupplier)
  37         {
  38                 this.defaultSnippetSupplier = defaultSnippetSupplier;
  39         }
  40
  41         public void addStandardSnippetID(String standardSnippetID, String associatedSnippetClassName)
  42         {
  43                 standardSnippetIDClassNames.put(standardSnippetID, associatedSnippetClassName);
  44         }
  45
  46         public void setSnippetSupplier(String id, SnippetSupplier<?, S> snippetSupplier)
  47         {
  48                 snippetSuppliersForClassNames.put(id, snippetSupplier);
  49         }
  50
  51         // TODO report errors
  52         public SnippetSupplier<?, S> getSnippetSupplier(String id)
  53         {
  54                 if (id != null)
  55                 {
  56                         String snippetClassName;
  57                         if (id.startsWith("class:"))
  58                                 snippetClassName = id.substring(6);
  59                         else
  60                                 snippetClassName = standardSnippetIDClassNames.get(id);
  61                         if (snippetClassName != null)
  62                         {
  63                                 tryLoadSnippetClass(snippetClassName);
  64                                 SnippetSupplier<?, S> snippetSupplier = snippetSuppliersForClassNames.get(snippetClassName);
  65                                 if (snippetSupplier != null)
  66                                         return snippetSupplier;
  67                         }
  68                         System.err.println("Couldn't load snippet " + id + "; using default");
  69                 }
  70                 return defaultSnippetSupplier;
  71         }
  72
  73         // static helpers
  74
  75         static
  76         {
  77                 try (InputStream s = IndirectGUIComponentCreator.class.getResourceAsStream("./standardSnippetIDMapping.json"))
  78                 {
  79                         if (s == null)
  80                                 throw new IOException("Resource not found");
  81                         SnippetIDClassNames tmp = JsonHandler.readJson(s, SnippetIDClassNames.class);
  82                         tmp.standardOutlineRendererSuppliers.forEach(outlineRendererSupplier::addStandardSnippetID);
  83                         tmp.standardSymbolRendererSuppliers.forEach(symbolRendererSupplier::addStandardSnippetID);
  84                         tmp.standardHighLevelStateHandlerSuppliers.forEach(highLevelStateHandlerSupplier::addStandardSnippetID);
  85                 }
  86                 catch (Exception e)
  87                 {
  88                         System.err.println("Failed to initialize standard snippet ID mapping: ");
  89                         e.printStackTrace();
  90                 }
  91         }
  92
  93         private static class SnippetIDClassNames
  94         {
  95                 public Map<String, String> standardOutlineRendererSuppliers;
  96                 public Map<String, String> standardSymbolRendererSuppliers;
  97                 public Map<String, String> standardHighLevelStateHandlerSuppliers;
  98         }
  99
 100         private static void tryLoadSnippetClass(String snippetClassName)
 101         {
 102                 tryInvokeStaticInitializer(snippetClassName, "Error getting snippet class: %s: %s\n");
 103         }
 104
 105         public static void tryInvokeStaticInitializer(String className, String errorMessageFormat)
 106         {
 107                 try
 108                 {
 109                         Class.forName(className, true, CodeSnippetSupplier.class.getClassLoader());
 110                 }
 111                 catch (ClassNotFoundException e)
 112                 {
 113                         System.err.printf(errorMessageFormat, className, "ClassNotFoundException thrown: " + e.getMessage());
 114                 }
 115         }
 116
 117 }