Question

我正在使用JDT ASTParser来解析给定文件夹中的所有Java文件。我写了以下代码：

private void parse(String fileContent) {
    // TODO Auto-generated method stub
    //advise the parser to parse the code following to the Java Language Specification, Third Edition.
    ASTParser parser = ASTParser.newParser(AST.JLS3); 
    // tell the parser, that it has to expect an ICompilationUnit (a pointer to a Java file) as input.
    parser.setKind(ASTParser.K_COMPILATION_UNIT);       
    parser.setSource(fileContent.toCharArray());
    parser.setResolveBindings(true);
    final CompilationUnit cu = (CompilationUnit) parser.createAST(null);

    cu.accept(new ASTVisitor() {
        public boolean visit(AnnotationTypeDeclaration node) {

            System.out.println("Annotaion: " + node.getName());

            return true;
        }

        public boolean visit(TypeDeclaration node) {

            System.out.println("Type: " + node.getName());

            return true;
        }
    });     

}

问题是，有两种Java类：

Bound2Processor.java是一个普通的java类：TypeDeclaration

package com.richardle;

import ...;


public class Bound2Processor extends AbstractAnnotationProcessor<Bound, CtMethod<?>> {
   ...
}

Bound.java是注释声明类：AnnotationTypeDeclaration

    package com.richardle;    
    public @interface Bound {
        double min(); 
    }

但是在运行代码时，我得到了输出：

File: D:\SOFTWARE\Android\SpoonTest\src\com\richardle\Bound.java // no thing print here
File: D:\SOFTWARE\Android\SpoonTest\src\com\richardle\Bound2Processor.java
Type: Bound2Processor

问题是没有打印注释类的名称。也许ASTParser不会调用函数public boolean visit(AnnotationTypeDeclaration node)。你能告诉我为什么ASTParser会忽略这个功能吗？如何确定一个类是普通的类或注释声明？

Answer 1

如果Java合规性设置为大于1.5，则仅由ASTParser解析注释。

来自ASTParser Javadoc：

为了解析1.5代码，需要将一些编译器选项设置为1.5

因此，您需要在代码中添加以下行：

Map options = JavaCore.getOptions();
JavaCore.setComplianceOptions(JavaCore.VERSION_1_5, options);
parser.setCompilerOptions(options);

修改

以下是我用于测试的完整parse方法：

public static void parse(String fileContent) { //advise the parser to parse the code following to the Java Language Specification, Third Edition. ASTParser parser = ASTParser.newParser(AST.JLS3); Map options = JavaCore.getOptions(); JavaCore.setComplianceOptions(JavaCore.VERSION_1_5, options); parser.setCompilerOptions(options); // tell the parser, that it has to expect an ICompilationUnit (a pointer to a Java file) as input. parser.setKind(ASTParser.K_COMPILATION_UNIT); parser.setSource(fileContent.toCharArray()); parser.setResolveBindings(true); final CompilationUnit cu = (CompilationUnit) parser.createAST(null); cu.accept(new ASTVisitor() { public boolean visit(AnnotationTypeDeclaration node) { System.out.println("Annotaion: " + node.getName()); return true; } public boolean visit(TypeDeclaration node) { System.out.println("Type: " + node.getName()); return true; } }); }

以下是我作为parse(String)的输入提供的非常简单的类：

public @interface Bound { double min(); } public class Bound2Processor { }

这是输出：

Annotaion: Bound Type: Bound2Processor

如何使用JDT确定类是AnnotationDeclaration还是TypeDeclaration

1 个答案: