feat: support for locating missing class in Java.SymbolNotFoundError

Author: nedpals

error_templates/java/symbol_not_found_error.go

@@ -29,7 +29,12 @@ var SymbolNotFoundError = lib.ErrorTemplate{
 			rootNode:      m.Nearest,
 		}
 
-		query := fmt.Sprintf("((identifier) @symbol (#eq? @symbol \"%s\"))", symbolName)
+		nodeTypeToFind := "identifier"
+		if errorCtx.symbolType == "class" {
+			nodeTypeToFind = "type_identifier"
+		}
+
+		query := fmt.Sprintf("((%s) @symbol (#eq? @symbol \"%s\"))", nodeTypeToFind, symbolName)
 		lib.QueryNode(m.Nearest, strings.NewReader(query), func(ctx lib.QueryNodeCtx) bool {
 			match := ctx.Cursor.FilterPredicates(ctx.Match, []byte(m.Nearest.Doc.Contents))
 			for _, c := range match.Captures {
@@ -65,6 +70,8 @@ var SymbolNotFoundError = lib.ErrorTemplate{
 			gen.Add(`The program cannot find variable "%s"`, ctx.symbolName)
 		case "method":
 			gen.Add("The error indicates that the compiler cannot find the method `%s` in the `%s` class.", ctx.symbolName, ctx.locationClass)
+		case "class":
+			gen.Add("The error indicates that the compiler cannot find the class `%s` when attempting to create an instance of it in the `%s` class.", ctx.symbolName, ctx.locationClass)
 		}
 	},
 	OnGenBugFixFn: func(cd *lib.ContextData, gen *lib.BugFixGenerator) {
@@ -99,6 +106,21 @@ var SymbolNotFoundError = lib.ErrorTemplate{
 						EndPosition:   lastMethodNode.EndPosition().Add(lib.Position{Column: 1}), // same thing here
 					})
 			})
+		case "class":
+			gen.Add("Create the missing class", func(s *lib.BugFixSuggestion) {
+				s.AddStep("Create a new class named `%s` to resolve the \"cannot find symbol\" error.", ctx.symbolName).
+					AddFix(lib.FixSuggestion{
+						NewText: fmt.Sprintf("class %s {\n\t// Add any necessary code for %s class\n}\n\n", ctx.symbolName, ctx.symbolName),
+						StartPosition: lib.Position{
+							Line:   ctx.locationNode.StartPosition().Line,
+							Column: 0,
+						},
+						EndPosition: lib.Position{
+							Line:   ctx.locationNode.StartPosition().Line,
+							Column: 0,
+						},
+					})
+			})
 		}
 	},
 }

error_templates/java/test_files/no_class_def_error/test.txt

@@ -0,0 +1,40 @@
+name: "MissingClass"
+template: "Java.SymbolNotFoundError"
+---
+MyClass.java:5: error: cannot find symbol
+        NonExistingClass obj = new NonExistingClass();
+        ^
+  symbol:   class NonExistingClass
+  location: class MyClass
+MyClass.java:5: error: cannot find symbol
+        NonExistingClass obj = new NonExistingClass();
+                                   ^
+  symbol:   class NonExistingClass
+  location: class MyClass
+2 errors
+===
+template: "Java.SymbolNotFoundError"
+---
+# SymbolNotFoundError
+The error indicates that the compiler cannot find the class `NonExistingClass` when attempting to create an instance of it in the `MyClass` class.
+```
+        // Attempting to create an instance of a non-existing class
+        NonExistingClass obj = new NonExistingClass();
+        ^^^^^^^^^^^^^^^^
+    }
+}
+```
+## Steps to fix
+### Create the missing class
+Create a new class named `NonExistingClass` to resolve the "cannot find symbol" error.
+```diff
+// MyClass.java
+- public class MyClass {
++ class NonExistingClass {
++     // Add any necessary code for NonExistingClass class
++ }
++
++ public class MyClass {
+    public static void main(String[] args) {
+        // Attempting to create an instance of a non-existing class
+```