org.opoo.press.util.ClassUtils.java Source code

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Here is the source code for org.opoo.press.util.ClassUtils.java

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/*
 * Copyright 2013 Alex Lin.
 *
 * 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 org.opoo.press.util;

import org.opoo.press.Config;
import org.opoo.press.ConfigAware;
import org.opoo.press.Site;
import org.opoo.press.SiteAware;

/**
 * @author Alex Lin
 *
 */
public abstract class ClassUtils extends org.apache.commons.lang.ClassUtils {

    /**
     * Create a new instance for the specified class name.
     * @param className class name
     * @param site site object
     * @return new instance
     */
    public static <T> T newInstance(String className, Site site) {
        return newInstance(className, null, site, site != null ? site.getConfig() : null);
    }

    /**
     * Create a new instance for the specified class name.
     * @param className class name
     * @param config site configuration
     * @return new instance
     */
    public static <T> T newInstance(String className, Config config) {
        return newInstance(className, null, null, config);
    }

    /**
     * Create a new instance for the specified class name.
     * @param className class name
     * @param <T>
     * @return new instance
     */
    public static <T> T newInstance(String className) {
        return newInstance(className, (ClassLoader) null);
    }

    /**
     *
     * @param className
     * @param classLoader
     * @param <T>
     * @return
     */
    public static <T> T newInstance(String className, ClassLoader classLoader) {
        return newInstance(className, classLoader, null, null);
    }

    /**
     *
     * @param className class name
     * @param classLoader class loader
     * @param site site
     * @param config site configuration
     * @param <T> type of class
     * @return class instance
     */
    public static <T> T newInstance(String className, ClassLoader classLoader, Site site, Config config) {
        if (classLoader == null) {
            classLoader = Thread.currentThread().getContextClassLoader();
        }

        T instance = null;
        try {
            Class<?> clazz = getClass(classLoader, className);
            instance = (T) clazz.newInstance();
        } catch (ClassNotFoundException e) {
            throw new RuntimeException("Create instance failed: " + className, e);
        } catch (InstantiationException e) {
            throw new RuntimeException("Create instance failed: " + className, e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException("Create instance failed: " + className, e);
        }

        if (instance instanceof SiteAware) {
            ((SiteAware) instance).setSite(site);
        }
        if (instance instanceof ConfigAware) {
            ((ConfigAware) instance).setConfig(config);
        }
        return instance;
    }

}