com.bluecloud.ioc.classloader.ClassHandler.java Source code

Introduction

Here is the source code for com.bluecloud.ioc.classloader.ClassHandler.java

Source

/*
 * Copyright 2010 the original author or authors.
 * 
 * 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.bluecloud.ioc.classloader;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author <a href="mailto:hanlu0808@gmail.com">Hanlu</a>
 * 
 */
public final class ClassHandler {

    private static Log log = LogFactory.getLog(ClassHandler.class);

    /**
     * @param classloader
     * 
     */
    private ClassHandler() {
    }

    /**
     * <h3>Class</h3> ?classNameClass
     * 
     * @param className
     *            ?Class??
     * @param isNewInstance
     *            ?
     * @return ?ClassLoader?ClassLoader??
     *         ClassNotFoundException
     *         ???isNewInstancetrueObjectfalseClass<? extends Object>
     * @throws InstantiationException
     * @throws IllegalAccessException
     * @throws ClassNotFoundException
     * @throws NoSuchMethodException
     * @throws InvocationTargetException
     * @throws SecurityException
     * @throws IllegalArgumentException
     */
    public static Object getClass(String className, boolean isNewInstance)
            throws InstantiationException, IllegalAccessException, ClassNotFoundException, IllegalArgumentException,
            SecurityException, InvocationTargetException, NoSuchMethodException {
        ClassLoader classloader = Thread.currentThread().getContextClassLoader();
        Class<?> clazz = classloader.loadClass(className);
        if (isNewInstance) {
            return getClassNewInstrance(clazz);
        }
        return clazz;
    }

    /**
     * <h3>Class</h3>
     * 
     * @param clazz
     * @return
     * @throws ClassNotFoundException
     * @throws IllegalAccessException
     * @throws InstantiationException
     * @throws NoSuchMethodException
     * @throws InvocationTargetException
     * @throws SecurityException
     * @throws IllegalArgumentException
     */
    private static Object getClassNewInstrance(Class<?> clazz)
            throws ClassNotFoundException, InstantiationException, IllegalAccessException, IllegalArgumentException,
            SecurityException, InvocationTargetException, NoSuchMethodException {
        if (clazz == null) {
            throw new ClassNotFoundException();
        }
        return clazz.getConstructor((Class[]) null).newInstance((Object[]) null);
    }

    /**
     * <h3></h3> ?Class Instance
     * 
     * @param className
     *            ??
     * @param index
     *            Class?constructorIndex?0Class?
     *            0
     * @param initargs
     *            ??
     * @return classNameClassObject
     * @throws ClassNotFoundException
     * @throws IllegalAccessException
     * @throws InstantiationException
     * @throws InvocationTargetException
     * @throws IllegalArgumentException
     * @throws NoSuchMethodException
     * @throws SecurityException
     */
    public static Object createObject(String className, int index, Object[] initargs)
            throws InstantiationException, IllegalAccessException, ClassNotFoundException, IllegalArgumentException,
            InvocationTargetException, SecurityException, NoSuchMethodException {
        Class<?> clazz = (Class<?>) getClass(className, false);
        if (index < 0 || index > clazz.getConstructors().length - 1) {
            index = 0;
        }
        Constructor<?> constructor = clazz.getConstructors()[index];
        return constructor.newInstance(initargs);
    }

    /**
     * <h3></h3> ?Class Instance
     * 
     * @param className
     *            ??
     * @param parameterTypes
     *            ??
     * @param initargs
     *            ??
     * @return classNameClassObject
     * @throws ClassNotFoundException
     * @throws IllegalAccessException
     * @throws InstantiationException
     * @throws NoSuchMethodException
     * @throws InvocationTargetException
     * @throws SecurityException
     * @throws IllegalArgumentException
     */
    public static Object createObject(String className, Class<?>[] parameterTypes, Object[] initargs)
            throws InstantiationException, IllegalAccessException, ClassNotFoundException, IllegalArgumentException,
            SecurityException, InvocationTargetException, NoSuchMethodException {
        Class<?> clazz = (Class<?>) getClass(className, false);
        return clazz.getConstructor(parameterTypes).newInstance(initargs);
    }

    /**
     * <h3>Class</h3>
     * 
     * @param obj
     *            
     * @param methodName
     *            ??
     * @param args
     *            ?
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static void invokeMethod(Object obj, String methodName, Object args)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        Class<? extends Object> clazz = obj.getClass();
        try {
            if (args != null) {
                clazz.getMethod(methodName, args.getClass()).invoke(obj, args);
            }
        } catch (SecurityException e) {
            log.error(e.getMessage(), e);
        } catch (NoSuchMethodException e) {
            for (Method method : clazz.getMethods()) {
                if (method.getName().equals(methodName) && method.getParameterTypes().length == 1) {
                    method.invoke(obj, args);
                }
            }
        }
    }

}