Java Reflection Method Get from Object getMethodAnnotatedWith(final Class type, final Class annotation, String fieldName, Object fieldValue)

Description

get Method Annotated With

License

Open Source License

Declaration

public static Method getMethodAnnotatedWith(final Class<?> type, final Class<? extends Annotation> annotation,
            String fieldName, Object fieldValue) 

Method Source Code

//package com.java2s;
/*/*from   w  w w. j a v  a  2  s  .co  m*/
 * The MIT License
 *
 * Copyright 2014 Robert Peralta.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

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

public class Main {
    public static Method getMethodAnnotatedWith(final Class<?> type, final Class<? extends Annotation> annotation,
            String fieldName, Object fieldValue) {
        List<Method> methods = getMethodsAnnotatedWith(type, annotation);

        for (Method m : methods)
            try {
                Annotation an = m.getAnnotation(annotation);
                Method anMethod = an.annotationType().getDeclaredMethod(fieldName);
                Object value = anMethod.invoke(an);

                if (value.toString().equals(fieldValue))
                    return m;

            } catch (Exception ex) {
                System.out.println(ex.getMessage());
                ex.printStackTrace();
            }
        return null;
    }

    public static List<Method> getMethodsAnnotatedWith(final Class<?> type,
            final Class<? extends Annotation> annotation) {

        final List<Method> methods = new ArrayList<Method>();

        for (Method m : type.getDeclaredMethods())
            if (m.getAnnotation(annotation) != null)
                methods.add(m);

        return methods;
    }
}

Related

1. getMethod(Object pojo, String methodName, Class[] params)
2. getMethod(Object target, String methodName)
3. getMethod(Object target, String methodName, Class... parameterTypes)
4. getMethod(Object target, String signature)
5. getMethod(String methodName, Object instance)
6. getMethodByName(Object target, String methodName)
7. getMethodConfigByAnnotaton(Object instance, Class declaringClass, Class annotationType, Class type)
8. getMethodDescriptor(Object instance, String methodName, Class aClass, Class... parameters)
9. getMethodFirstParamType(final String methodName, final Object o)