get Annotated Fields - Java Reflection

Java examples for Reflection:Field Get

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Description

get Annotated Fields

Demo Code

/*/* w w  w.ja  v a  2  s  . c om*/
 * Copyright 2012 Denis Neuling 
 * 
 * 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. 
 */
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.util.LinkedList;
import java.util.List;

public class Main{

    /**
     * <p>
     * getAnnotatedFields.
     * </p>
     *
     * @param clazz
     *            a {@link java.lang.Class} object.
     * @param annotationClass
     *            a {@link java.lang.Class} object.
     * @param <T>
     *            a T object.
     * @return a {@link java.util.List} object.
     */
    public static <T> List<Field> getAnnotatedFields(Class<?> clazz,
            Class<? extends Annotation> annotationClass) {
        List<Field> annotatedFields = new LinkedList<Field>();
        Field[] allFields = getAllDeclaredFields(clazz);
        for (Field field : allFields) {
            if (null != (field.getAnnotation(annotationClass))) {
                annotatedFields.add(field);
            }
        }
        return annotatedFields;
    }
    /**
     * <p>
     * getAllDeclaredFields.
     * </p>
     *
     * @param clazz
     *            a {@link java.lang.Class} object.
     * @return an array of {@link java.lang.reflect.Field} objects.
     */
    public static Field[] getAllDeclaredFields(Class<?> clazz) {
        Field[] declaredFields = clazz.getDeclaredFields();
        Class<?> superClass = clazz.getSuperclass();
        if (superClass != null && superClass != Object.class) {
            declaredFields = ArrayUtils.concat(declaredFields,
                    getAllDeclaredFields(superClass));
        }
        return declaredFields;
    }
}

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