// The "source" variable is an ICompilationUnit instance
final Document document = new Document(source.getSource());

// The "node" variable is a CompilationUnit instance
final AST ast = node.getAST();

final ASTRewrite rewriter = ASTRewrite.create(ast);
final TextEditGroup group = new TextEditGroup(SortClassMembersRefactoring.class.getName());

final MethodDeclarationFinder finder = new MethodDeclarationFinder();
final Collection<MethodDeclaration> methodDeclarationNodes = finder.getMethodDeclarations(node);

for (final MethodDeclaration methodDeclarationNode : methodDeclarationNodes) {
      // I enter here
      rewriter.remove(methodDeclarationNode, group);
}

if (methodDeclarationNodes.size() > 0) {
      // I enter here
      final TextEdit edit = rewriter.rewriteAST(document, null);
      edit.apply(document);
      TextFileChange change = SortClassMembersRefactoring.this._changes.get(source);
      if (change == null) {
          // I enter here
          change = new TextFileChange(source.getElementName(), (IFile) source.getResource());
          change.setTextType("java");
          change.setEdit(edit);
      } else {
          change.getEdit().addChild(edit);
      }
      SortClassMembersRefactoring.this._changes.put(source, change);
}