How can I implement this method in the basic class ASTNode so that I can obtain different ASTNode line number easier? For exampel, if I want to get MethodDeclaration location I need to write code
@Override
public boolean visit(MethodDeclaration node) {
int lineNum = ((CompilationUnit) node.getRoot()).getLineNumber(node.getStartPosition());
return super.visit(node);
}
However, I want to get location information like this
@Override
public boolean visit(MethodDeclaration node) {
int lineNum = node.getLineNumber();
return super.visit(node);
}
CompilationUnit provides a method called getLineNumber implemented with lineEndTable and general ASTNode only have a field named startPosition, so is it possible that I can obtain a lineEntTable in the abstract class ASTNode?
"Is it possible...?" No, individual nodes like MethodDeclaration don't have this information. In order to avoid redundancy lineEndTable is stored in only one particular node, the CompilationUnit. Given you have already found a solution there is no benefit in looking for another solution. The API is sufficient and the extra code you have to write is minimal.