alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Struts example source code file (ReflectionTools.java)

This example Struts source code file (ReflectionTools.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

annotation, annotation, arraylist, class, class, list, method, nosuchmethodexception, nosuchmethodexception, reflection, reflectiontools, runtimeexception, string, string, t, t, util

The Struts ReflectionTools.java source code

/*
 * $Id: ReflectionTools.java 743811 2009-02-12 17:13:21Z musachy $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.struts2.convention;

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

/**
 * <p>
 * This class has some reflection helpers.
 * </p>
 */
public class ReflectionTools {
    /**
     * Determines if the class given contains the method.
     *
     * @param   klass The class to check for the method.
     * @param   method The method name.
     * @param   parameterTypes The parameter types of the method.
     * @return  True if the method exists, false if not.
     */
    public static boolean containsMethod(Class<?> klass, String method, Class... parameterTypes) {
        try {
            klass.getMethod(method, parameterTypes);
            return true;
        } catch (NoSuchMethodException e) {
            return false;
        }
    }

    /**
     * Retrieves the annotation from the given method in the given class.
     *
     * @param   klass The class.
     * @param   methodName The method.
     * @param   annotationClass The annotation to get.
     * @return  The annotation or null if it doesn't exist.
     */
    public static <T extends Annotation> T getAnnotation(Class klass, String methodName, Class annotationClass) {
        try {
            Method method = klass.getMethod(methodName);
            return method.getAnnotation(annotationClass);
        } catch (NoSuchMethodException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Return the list of parent classes in order (Object will be at index 0)
     * @param clazz class to process
     * @return hierarchy of classes
     */
    public static List<Class getClassHierarchy(Class clazz) {
        List<Class classes = new ArrayList>();
        while (clazz != null) {
            classes.add(0, clazz);
            clazz = clazz.getSuperclass();
        }

        return classes;
    }
}

Other Struts examples (source code examples)

Here is a short list of links related to this Struts ReflectionTools.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.