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