Find Annotated Fields : Annotation « Reflection « Java

1. Java
2. Reflection
3. Annotation

Find Annotated Fields

    
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

public class Util{
  public static Field[] findAnnotatedFields(Class<?> clazz, Class<? extends Annotation> annotationClass) {
    Field[] declaredFields = clazz.getDeclaredFields();
    List<Field> annotatedFields = new ArrayList<Field>(declaredFields.length);
    for (Field field : declaredFields) {
      if( field.isAnnotationPresent(annotationClass)){
        annotatedFields.add(field);
      }
    }
    return annotatedFields.toArray(new Field[annotatedFields.size()]);    
  }
  
  public static Annotation[] findFieldAnnotations(Class<?> clazz,String fieldName) throws NoSuchFieldException {
    Field field = clazz.getDeclaredField(fieldName);
    return field.getAnnotations();
  }
  
  public static <T extends Annotation> T findFieldAnnotation(Class<?> clazz,String fieldName, Class<T> annotationClass) throws NoSuchFieldException {
    Field field = clazz.getDeclaredField(fieldName);
    return field.getAnnotation(annotationClass);
  }
}

   
    
    
    
  

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