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

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