get Annotated Fields by annotation type - Android java.lang.reflect

Android examples for java.lang.reflect:Annotation

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Description

get Annotated Fields by annotation type

Demo Code

/*//w  w w .j  av a2s.  c  o  m

This file is part of Roboject

Copyright (c) 2010-2011 akquinet A.G.

Contact:  http://www.akquinet.de/en

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
 */
//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 List<Field> getAnnotatedFields(Class<?> clazz,
            Class<?> annotationType) {
        List<Field> allFields = getFields(clazz);

        List<Field> results = new ArrayList<Field>();
        for (Field field : allFields) {
            Annotation[] annotations = field.getAnnotations();
            for (Annotation annotation : annotations) {
                if (annotation.annotationType().isAssignableFrom(
                        annotationType)) {
                    results.add(field);
                }
            }
        }

        return results;
    }

    /**
     * Returns all declared fields of a class and all its super classes,
     * regardless of visibility modifier.
     */
    public static List<Field> getFields(Class<?> clazz) {
        List<Field> results = new ArrayList<Field>();
        getFields(results, clazz);
        return results;
    }

    private static void getFields(List<Field> fields, Class<?> clazz) {
        if (isTopMostClass(clazz)) {
            return;
        }

        for (Field field : clazz.getDeclaredFields()) {
            fields.add(field);
        }
        getFields(fields, clazz.getSuperclass());
    }

    private static boolean isTopMostClass(Class<?> clazz) {
        return clazz == null || clazz.getName().startsWith("android.")
                || clazz == Object.class;
    }
}

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