[jnigen] Add the ability to rename constructors (#1970)

Author: marshelino-maged

pkgs/jnigen/lib/src/bindings/renamer.dart

@@ -236,7 +236,7 @@ class _MethodRenamer implements Visitor<Method, void> {
   @override
   void visit(Method node) {
     final name = _preprocess(
-        node.isConstructor ? 'new' : node.userDefinedName ?? node.name);
+        node.userDefinedName ?? (node.isConstructor ? 'new' : node.name));
     final sig = node.javaSig;
     // If node is in super class, assign its number, overriding it.
     final superClass =

pkgs/jnigen/lib/src/elements/j_elements.dart

@@ -70,6 +70,8 @@ class Method implements Element {
 
   String get originalName => _method.name;
 
+  bool get isConstructor => _method.isConstructor;
+
   @override
   void accept(Visitor visitor) {
     visitor.visitMethod(this);

pkgs/jnigen/test/user_visitors.dart

@@ -67,6 +67,9 @@ class UserRenamer extends Visitor {
     if (method.originalName.contains('Foo')) {
       method.name = method.originalName.replaceAll('Foo', 'Bar');
     }
+    if (method.isConstructor) {
+      method.name = 'constructor';
+    }
   }
 
   @override
@@ -172,6 +175,7 @@ void main() {
             ast.Param(name: 'Foo', type: ast.TypeUsage.object),
             ast.Param(name: 'Foo1', type: ast.TypeUsage.object),
           ]),
+          ast.Method(name: '<init>', returnType: ast.TypeUsage.object)
         ],
       ),
     });
@@ -190,6 +194,8 @@ void main() {
     expect(classes.decls['Foo']?.methods.finalNames,
         [r'Bar$2', r'Bar$3', r'Bar1$2', r'Bar1$3']);
 
+    expect(classes.decls['y.Foo']?.methods.finalNames, [r'Bar', 'constructor']);
+
     expect(classes.decls['y.Foo']?.methods.first.params.finalNames,
         ['Bar', 'Bar1']);
   });