public static MethodDeclaration convertToAstNode(final IMethod method) throws JavaModelException
{
    final ICompilationUnit compilationUnit = method.getCompilationUnit();

    final ASTParser astParser = ASTParser.newParser( AST.JLS4 );
    astParser.setSource( compilationUnit );
    astParser.setKind( ASTParser.K_COMPILATION_UNIT );
    astParser.setResolveBindings( true );
    astParser.setBindingsRecovery( true );

    final ASTNode rootNode = astParser.createAST( null );

    final CompilationUnit compilationUnitNode = (CompilationUnit) rootNode;

    final String key = method.getKey();

    final ASTNode javaElement = compilationUnitNode.findDeclaringNode( key );

    final MethodDeclaration methodDeclarationNode = (MethodDeclaration) javaElement;

    return methodDeclarationNode;
}