[英]Roaster: How to provide a custom parameter value with an annotation?
給定以下內容:
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();
}
}
輸出看起來像這樣:
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庫將參數(在這種情況下為計數器)添加到注釋中以獲得以下結果?
@Parsed(index = 0)
private String personId;
我嘗試了一些沒有成功的方法...
使用setAnnotationValue():
javaClass.addProperty(DATA_TYPE, columnName).getField()
.addAnnotation(com.univocity.parsers.annotations.Parsed.class)
.addAnnotationValue(INDEX).setAnnotationValue(columnIndex);
投擲
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)
並使用setLiteralValue()方法:
javaClass.addProperty(DATA_TYPE, columnName).getField()
.addAnnotation(com.univocity.parsers.annotations.Parsed.class)
.addAnnotationValue(INDEX).setLiteralValue(columnIndex);
結果是:
@Parsed(index = @MISSING(0))
private String personId;
從測試https://github.com/forge/roaster/blob/master/tests/src/test/java/org/jboss/forge/test/roaster/model/common/AnnotationTest.java表現出一定的使用情況,但我無法弄清楚如何獲得我想要的結果。
我想您會在4個月后知道答案,但是...總之應該是這樣的:
property.addAnnotation(annotation)
.setLiteralValue(
"index", "0");
請記住,如果您需要字符串...,那么這有點陌生,因為您需要添加一個額外的“,以便它成為
property.addAnnotation(annotation)
.setLiteralValue(
"index", "\"string-value\"");
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