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

   1 package net.mograsim.logic.model.snippets;
   2
   3 import java.util.Collections;
   4 import java.util.HashMap;
   5 import java.util.Map;
   6 import java.util.Set;
   7
   8 public class CodeSnippetSupplier<C, S>
   9 {
  10         private final Map<String, String> standardSnippetIDClassNames = new HashMap<>();
  11         private final Set<String> standardSnippetIDSetUnmodifiable = Collections.unmodifiableSet(standardSnippetIDClassNames.keySet());
  12         private final Map<String, SnippetDefinintion<C, ?, S>> snippetSuppliersForClassNames = new HashMap<>();
  13         private final SnippetDefinintion<C, ?, S> defaultSnippetSupplier;
  14
  15         public CodeSnippetSupplier(SnippetDefinintion<C, ?, S> defaultSnippetSupplier)
  16         {
  17                 this.defaultSnippetSupplier = defaultSnippetSupplier;
  18         }
  19
  20         public void addStandardSnippetID(String standardSnippetID, String associatedSnippetClassName)
  21         {
  22                 standardSnippetIDClassNames.put(standardSnippetID, associatedSnippetClassName);
  23         }
  24
  25         public Set<String> getStandardSnippetIDs()
  26         {
  27                 return standardSnippetIDSetUnmodifiable;
  28         }
  29
  30         public void setSnippetSupplier(String id, SnippetDefinintion<C, ?, S> snippetSupplier)
  31         {
  32                 snippetSuppliersForClassNames.put(id, snippetSupplier);
  33         }
  34
  35         // TODO report errors
  36         public SnippetDefinintion<C, ?, S> getSnippetSupplier(String id)
  37         {
  38                 if (id != null)
  39                 {
  40                         String snippetClassName;
  41                         if (id.startsWith("class:"))
  42                                 snippetClassName = id.substring(6);
  43                         else
  44                                 snippetClassName = standardSnippetIDClassNames.get(id);
  45                         if (snippetClassName != null)
  46                         {
  47                                 tryLoadSnippetClass(snippetClassName);
  48                                 SnippetDefinintion<C, ?, S> snippetSupplier = snippetSuppliersForClassNames.get(snippetClassName);
  49                                 if (snippetSupplier != null)
  50                                         return snippetSupplier;
  51                         }
  52                         System.err.println("Couldn't load snippet " + id + "; using default");
  53                 }
  54                 if (defaultSnippetSupplier == null)
  55                         throw new IllegalArgumentException("No default snippet set");
  56                 return defaultSnippetSupplier;
  57         }
  58
  59         // static helpers
  60
  61         private static void tryLoadSnippetClass(String snippetClassName)
  62         {
  63                 tryInvokeStaticInitializer(snippetClassName, "Error getting snippet class: %s: %s\n");
  64         }
  65
  66         public static void tryInvokeStaticInitializer(String className, String errorMessageFormat)
  67         {
  68                 try
  69                 {
  70                         Class.forName(className, true, CodeSnippetSupplier.class.getClassLoader());
  71                 }
  72                 catch (ClassNotFoundException e)
  73                 {
  74                         System.err.printf(errorMessageFormat, className, "ClassNotFoundException thrown: " + e.getMessage());
  75                 }
  76         }
  77
  78 }