给定以下内容:

public class CodeGenerator {

    private final static String PACKAGE = "nl.sander.mieras";
    private final static String CLASS = "Person";
    private final static Class<String> DATA_TYPE = String.class;
    private static final String INDEX = "index";
    private List<String> columnNames;

    public CodeGenerator() {
        columnNames = new ArrayList<>();
        columnNames.add("personId");
        columnNames.add("firstName");
        System.out.println(generateClass());
    }

    private String generateClass() {
        final JavaClassSource javaClass = Roaster.create(JavaClassSource.class);
        javaClass.setPackage(PACKAGE).setName(CLASS);
        int columnCount = -1;
        for (String columnName : columnNames) {
            columnCount++;
            String columnIndex = Integer.toString(columnCount);
            javaClass.addProperty(DATA_TYPE, columnName).getField()
                    .addAnnotation(com.univocity.parsers.annotations.Parsed.class)
                    .addAnnotationValue(INDEX);
        }

        return javaClass.toString();
    }

}


输出看起来像这样:

public class Person {

    @Parsed(index = @MISSING)
    private String personId;
    @Parsed(index = @MISSING)
    private String firstName;

    public String getPersonId() {
        return personId;
    }

    public void setPersonId(String personId) {
        this.personId = personId;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
}


如何使用roaster库将参数(在这种情况下为计数器)添加到注释中以获得以下结果?

@Parsed(index = 0)
private String personId;


我尝试了一些没有成功的方法...

使用setAnnotationValue():

javaClass.addProperty(DATA_TYPE, columnName).getField()
                    .addAnnotation(com.univocity.parsers.annotations.Parsed.class)
                    .addAnnotationValue(INDEX).setAnnotationValue(columnIndex);


投掷

Exception in thread "main" java.lang.ClassCastException: org.jboss.forge.roaster._shade.org.eclipse.jdt.core.dom.SingleMemberAnnotation cannot be cast to org.jboss.forge.roaster._shade.org.eclipse.jdt.core.dom.NormalAnnotation
    at org.jboss.forge.roaster.model.impl.AnnotationImpl.setAnnotationValue(AnnotationImpl.java:597)
    at nl.sander.mieras.CodeGenerator.generateClass(CodeGenerator.java:33)
    at nl.sander.mieras.CodeGenerator.<init>(CodeGenerator.java:21)
    at nl.sander.mieras.Main.main(Main.java:6)


并使用setLiteralValue()方法:

javaClass.addProperty(DATA_TYPE, columnName).getField()
                    .addAnnotation(com.univocity.parsers.annotations.Parsed.class)
                    .addAnnotationValue(INDEX).setLiteralValue(columnIndex);


结果是:

@Parsed(index = @MISSING(0))
private String personId;


https://github.com/forge/roaster/blob/master/tests/src/test/java/org/jboss/forge/test/roaster/model/common/AnnotationTest.java中的测试显示了一些用例,但我不知道如何获得所需的结果。

最佳答案

我想您会在4个月后知道答案,但是...总之应该是这样的:

property.addAnnotation(annotation)
                .setLiteralValue(
                        "index", "0");


请记住,如果您需要字符串...,那么这有点陌生,因为您需要添加一个额外的“,以便它成为

property.addAnnotation(annotation)
                .setLiteralValue(
                        "index", "\"string-value\"");

07-26 04:57