Generate a method to get TLObject from ID

generator/src/main/java/io/github/lonamiwebs/overgram/generator/Generator.java

@@ -18,10 +18,10 @@ public class Generator {
             writeAbstract(writer, types);
         }
         try (final Writer writer = new BufferedWriter(new FileWriter(typesFile))) {
-            writeCode(writer, "Types", null, types);
+            writeCode(writer, "Types", null, types, true);
         }
         try (final Writer writer = new BufferedWriter(new FileWriter(functionsFile))) {
-            writeCode(writer, "Functions", "TLRequest", functions);
+            writeCode(writer, "Functions", "TLRequest", functions, false);
         }
     }
 
@@ -49,7 +49,7 @@ public class Generator {
 
     private static void writeCode(
             final Writer writer, final String className, final String extendsName,
-            final List<TLObject> objects) throws IOException {
+            final List<TLObject> objects, final boolean generateGetList) throws IOException {
         writer.write("package io.github.lonamiwebs.overgram.tl;\n");
         writer.write("import io.github.lonamiwebs.overgram.utils.BinaryReader;\n");
         writer.write("import io.github.lonamiwebs.overgram.utils.BinaryWriter;\n");
@@ -124,6 +124,25 @@ public class Generator {
                 writer.write("}\n");
             }
         }
+
+        if (generateGetList) {
+            writer.write("public static TLObject getFromId(final int id) throws ClassNotFoundException {\n");
+            writer.write("switch (id) {\n");
+
+            for (final TLObject object : objects) {
+                writer.write("case " + object.code);
+                writer.write(":\n");
+                writer.write("return new Types.");
+                writer.write(TLObject.toCamelCase(object.fullname));
+                writer.write("();\n");
+            }
+
+            writer.write("default:\n");
+            writer.write("throw new ClassNotFoundException();\n");
+            writer.write("}\n");
+            writer.write("}\n");
+        }
+
         writer.write("}\n");
     }