plugins/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
   7 import net.mograsim.logic.model.serializing.ReflectionHelper;
   8
   9 public class CodeSnippetSupplier<C, S>
  10 {
  11         private final Map<String, String> standardSnippetIDClassNames = new HashMap<>();
  12         private final Map<String, String> standardSnippetIDClassNamesUnmodifiable = Collections.unmodifiableMap(standardSnippetIDClassNames);
  13         private final Map<String, SnippetDefinintion<C, ?, S>> snippetSuppliersForClassNames = new HashMap<>();
  14         private final SnippetDefinintion<C, ?, S> defaultSnippetSupplier;
  15
  16         public CodeSnippetSupplier(SnippetDefinintion<C, ?, S> defaultSnippetSupplier)
  17         {
  18                 this.defaultSnippetSupplier = defaultSnippetSupplier;
  19         }
  20
  21         public void addStandardSnippetID(String standardSnippetID, String associatedSnippetID)
  22         {
  23                 if (!associatedSnippetID.startsWith("class:"))
  24                         throw new IllegalArgumentException("Unrecognized snippet ID format: " + associatedSnippetID);
  25                 standardSnippetIDClassNames.put(standardSnippetID, associatedSnippetID);
  26         }
  27
  28         public Map<String, String> getStandardSnippetIDs()
  29         {
  30                 return standardSnippetIDClassNamesUnmodifiable;
  31         }
  32
  33         public void setSnippetSupplier(String id, SnippetDefinintion<C, ?, S> snippetSupplier)
  34         {
  35                 snippetSuppliersForClassNames.put(id, snippetSupplier);
  36         }
  37
  38         // TODO report errors
  39         public SnippetDefinintion<C, ?, S> getSnippetSupplier(String id)
  40         {
  41                 if (id != null)
  42                 {
  43                         String resolvedID = resolveID(id);
  44                         if (resolvedID != null)
  45                         {
  46                                 String snippetClassName = resolvedID.substring(6);
  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         public String resolveID(String id)
  60         {
  61                 if (id.startsWith("class:"))
  62                         return id;
  63                 return standardSnippetIDClassNames.get(id);
  64         }
  65
  66         // static helpers
  67
  68         private static void tryLoadSnippetClass(String snippetClassName)
  69         {
  70                 ReflectionHelper.tryInvokeStaticInitializer(snippetClassName, "Error getting snippet class: %s: %s\n");
  71         }
  72 }