为什么resolveBinding（）返回null即使我在我的ASTParser上setResolveBindings（true）？ [英] Why does resolveBinding() return null even though I setResolveBindings(true) on my ASTParser?

问题描述

我正在编写一个使用JDT AST的 ASTParser 来解析方法的Eclipse插件。我正在寻找创建一个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 我调用 getType（）来查看要实例化的类型。我想确保正在处理的完全解决的类型是我认为的那样，所以我将结果 Type object to $ code> resolveBinding（）。即使没有编译错误，即使我在 null 中调用 setResolveBindings（true） C $ C> ASTParser 。我通过 ASTParser （通过 setSource（）） ICompilationUnit 包含我的方法，所以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（） return 空？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概述的底部。 setKind（），仔细隐藏人员疑难解答 resolveBinding（）和 setResolveBindings（）是

Tucked away at the bottom of the overview of ASTParser.setKind(), carefully hidden from people troubleshooting resolveBinding() and setResolveBindings(), is the statement

绑定信息仅在 kind 是 K_COMPILATION_UNIT 。

（从在线Javadoc ）

我不明白为什么会这样，但它似乎很明确地指出需要什么不同！

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resolveBinding（）返回null即使我在我的ASTParser上setResolveBindings（true）？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IT屋！