find Field Annotation from class and field name - Java java.lang.annotation

Java examples for java.lang.annotation:Field Annotation

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Description

find Field Annotation from class and field name

Demo Code


//package com.java2s;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;

import java.util.ArrayList;
import java.util.List;

public class Main {

    public static Annotation[] findFieldAnnotation(Class<?> clazz,
            String fieldName) {/*from w  ww .  j a v a2  s. c o m*/
        Annotation[] annotations = null;
        try {
            List<Field> fields = getAllFields(clazz);
            Field field = null;
            for (Field fld : fields) {
                if (fld.getName().equals(fieldName)) {
                    field = fld;
                    break;
                }
            }
            if (field != null) {
                annotations = field.getAnnotations();
            }
        } catch (SecurityException e) {
        }
        return annotations;
    }

    public static List<Field> getAllFields(Class<?> type) {
        return getAllFields(null, type);
    }

    private static List<Field> getAllFields(List<Field> fields,
            Class<?> type) {
        if (fields == null)
            fields = new ArrayList<Field>();
        for (Field field : type.getDeclaredFields()) {
            fields.add(field);
        }

        if (type.getSuperclass() != null) {
            fields = getAllFields(fields, type.getSuperclass());
        }

        return fields;
    }
}

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