问题描述
我正在编写一个 Eclipse 插件，它使用 JDT AST 的 ASTParser 来解析一个方法.我正在寻找创建特定类型对象的方法.
I am writing an Eclipse plug-in that uses JDT AST's ASTParser to parse a method. I am looking within that method for the creation of a particular type of object.
当我找到一个 ClassInstanceCreation 时，我会在其上调用 getType() 以查看正在实例化的类型.我想确定正在处理的完全解析类型是我认为的类型，所以我将生成的 Type 对象告诉 resolveBinding().即使没有编译错误并且即使我在 ASTParser 上调用了 setResolveBindings(true)，我也会返回 null.我给了我的 ASTParser(通过 setSource())包含我的方法的 ICompilationUnit，因此解析器可以访问整个工作区上下文.
When I find a ClassInstanceCreation, I call getType() on it to see what type is being instantiated. I want to be sure that the fully-resolved type being dealt with there is the one I think it is, so I tell the resultant Type object to resolveBinding(). I get null back even though there are no compilation errors and even though I called setResolveBindings(true) on my ASTParser. I gave my ASTParser (via setSource()) the ICompilationUnit that contains my method, so the parser has access to the entire workspace context.
final IMethod method = ...;
final ASTParser parser = ASTParser.newParser(AST.JLS3);
parser.setResolveBindings(true);
parser.setSource(method.getCompilationUnit());
parser.setSourceRange(method.getSourceRange().getOffset(), method.getSourceRange().getLength());
parser.setKind(ASTParser.K_CLASS_BODY_DECLARATIONS);
final TypeDeclaration astRoot = (TypeDeclaration) parser.createAST(null);
final ClassInstanceCreation classInstanceCreation = walkAstAndFindMyExpression(astRoot);
final Type instantiatedType = classInstanceCreation.getType();
System.out.println("BINDING: " + instantiatedType.resolveBinding());
为什么 resolveBinding() 返回 null?如何获取绑定信息?
Why does resolveBinding() return null? How can I get the binding information?
推荐答案
隐藏在 ASTParser.setKind() 概览的底部，小心隐藏，不让人们排查问题 resolveBinding()和setResolveBindings()，就是语句
Tucked away at the bottom of the overview of ASTParser.setKind(), carefully hidden from people troubleshooting resolveBinding() and setResolveBindings(), is the statement
仅当 kind 为 K_COMPILATION_UNIT 时才计算绑定信息.
(来自 在线Javadoc)
我不明白为什么会这样，但它似乎非常清楚地指出了需要改变的地方！
I don't understand offhand why this would be the case, but it does seem to point pretty clearly at what needs to be different!
这篇关于为什么即使我在 ASTParser 上设置了 setResolveBindings(true)，resolveBinding() 仍会返回 null?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！