com.liferay.portal.kernel.util.InstanceFactory.java Source code

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Here is the source code for com.liferay.portal.kernel.util.InstanceFactory.java

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.kernel.util;

import java.lang.reflect.Constructor;

/**
 * @author Brian Wing Shun Chan
 */
public class InstanceFactory {

    public static Object newInstance(ClassLoader classLoader, String className) throws Exception {

        return newInstance(classLoader, className, (Class<?>[]) null, (Object[]) null);
    }

    public static Object newInstance(ClassLoader classLoader, String className, Class<?> parameterType,
            Object argument) throws Exception {

        return newInstance(classLoader, className, new Class<?>[] { parameterType }, new Object[] { argument });
    }

    public static Object newInstance(ClassLoader classLoader, String className, Class<?>[] parameterTypes,
            Object[] arguments) throws Exception {

        if (classLoader == null) {
            Thread currentThread = Thread.currentThread();

            classLoader = currentThread.getContextClassLoader();

            if (classLoader == null) {
                classLoader = ClassLoader.getSystemClassLoader();
            }
        }

        Class<?> clazz = classLoader.loadClass(className);

        if ((parameterTypes != null) && (arguments != null) && (parameterTypes.length > 0) && (arguments.length > 0)
                && (parameterTypes.length == arguments.length)) {

            Constructor<?> constructor = clazz.getConstructor(parameterTypes);

            return constructor.newInstance(arguments);
        }

        return clazz.newInstance();
    }

    public static Object newInstance(String className) throws Exception {
        return newInstance(null, className);
    }

    public static Object newInstance(String className, Class<?> parameterType, Object argument) throws Exception {

        return newInstance(null, className, new Class<?>[] { parameterType }, new Object[] { argument });
    }

    public static Object newInstance(String className, Class<?>[] parameterTypes, Object[] arguments)
            throws Exception {

        return newInstance(null, className, parameterTypes, arguments);
    }

}