JMeter example source code file (ClassTools.java)

This example JMeter source code file (ClassTools.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 - JMeter tags/keywords

class, class, classnotfoundexception, classtools, illegalaccessexception, illegalaccessexception, instantiationexception, jmeterexception, jmeterexception, nosuchmethodexception, object, object, reflection, securityexception, string

The JMeter ClassTools.java source code

/*
 * 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.jorphan.reflect;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.commons.lang.ClassUtils;
import org.apache.jorphan.util.JMeterException;

/**
 * Utility methods for handling dynamic access to classes.
 */
public class ClassTools {


    /**
     * Call no-args constructor for a class.
     *
     * @param className
     * @return an instance of the class
     * @throws JMeterException if class cannot be created
     */
    public static Object construct(String className) throws JMeterException {
        Object instance = null;
        try {
            instance = ClassUtils.getClass(className).newInstance();
        } catch (ClassNotFoundException e) {
            throw new JMeterException(e);
        } catch (InstantiationException e) {
            throw new JMeterException(e);
        } catch (IllegalAccessException e) {
            throw new JMeterException(e);
        }
        return instance;
    }

    /**
     * Call a class constructor with an integer parameter
     * @param className
     * @param parameter (integer)
     * @return an instance of the class
     * @throws JMeterException if class cannot be created
     */
    public static Object construct(String className, int parameter) throws JMeterException
    {
        Object instance = null;
        try {
            Class<?> clazz = ClassUtils.getClass(className);
            clazz.getConstructor(new Class [] {Integer.TYPE});
            instance = ClassUtils.getClass(className).newInstance();
        } catch (ClassNotFoundException e) {
            throw new JMeterException(e);
        } catch (InstantiationException e) {
            throw new JMeterException(e);
        } catch (IllegalAccessException e) {
            throw new JMeterException(e);
        } catch (SecurityException e) {
            throw new JMeterException(e);
        } catch (NoSuchMethodException e) {
            throw new JMeterException(e);
        }
        return instance;
    }

    /**
     * Invoke a public method on a class instance
     *
     * @param instance
     * @param methodName
     * @throws SecurityException
     * @throws IllegalArgumentException
     * @throws JMeterException
     */
    public static void invoke(Object instance, String methodName)
    throws SecurityException, IllegalArgumentException, JMeterException
    {
        Method m;
        try {
            m = ClassUtils.getPublicMethod(instance.getClass(), methodName, new Class [] {});
            m.invoke(instance, (Object [])null);
        } catch (NoSuchMethodException e) {
            throw new JMeterException(e);
        } catch (IllegalAccessException e) {
            throw new JMeterException(e);
        } catch (InvocationTargetException e) {
            throw new JMeterException(e);
        }
    }
}