com.bstek.dorado.web.servlet.ServletContextResourceLoader.java Source code

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Here is the source code for com.bstek.dorado.web.servlet.ServletContextResourceLoader.java

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/*
 * This file is part of Dorado 7.x (http://dorado7.bsdn.org).
 * 
 * Copyright (c) 2002-2012 BSTEK Corp. All rights reserved.
 * 
 * This file is dual-licensed under the AGPLv3 (http://www.gnu.org/licenses/agpl-3.0.html) 
 * and BSDN commercial (http://www.bsdn.org/licenses) licenses.
 * 
 * If you are unsure which license is appropriate for your use, please contact the sales department
 * at http://www.bstek.com/contact.
 */

package com.bstek.dorado.web.servlet;

import java.io.IOException;
import java.lang.reflect.Constructor;

import javax.servlet.ServletContext;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.core.io.ResourceLoader;

import com.bstek.dorado.core.io.BaseResourceLoader;
import com.bstek.dorado.core.io.InputStreamResource;
import com.bstek.dorado.core.io.Resource;
import com.bstek.dorado.util.clazz.ClassUtils;
import com.bstek.dorado.web.ConsoleUtils;

/**
 * @author Benny Bao (mailto:benny.bao@bstek.com)
 * @since 2011-1-12
 */
public class ServletContextResourceLoader extends BaseResourceLoader {
    private static final Log logger = LogFactory.getLog(ServletContextResourceLoader.class);

    private ServletContext servletContext;
    private ResourceLoader resourceLoader;

    public ServletContextResourceLoader(ServletContext servletContext) {
        this.servletContext = servletContext;
        String resourceLoaderClass = servletContext.getInitParameter("resourceLoaderClass");
        if (StringUtils.isNotEmpty(StringUtils.trim(resourceLoaderClass))) {
            ConsoleUtils.outputLoadingInfo("[resourceLoaderClass=" + resourceLoaderClass + "]");

            try {
                @SuppressWarnings("unchecked")
                Class<ResourceLoader> type = ClassUtils.forName(resourceLoaderClass);
                Constructor<ResourceLoader> constr = type.getConstructor(new Class[] { ClassLoader.class });
                resourceLoader = constr.newInstance(new Object[] { getClass().getClassLoader() });
            } catch (Exception e) {
                logger.error(e, e);
            }
        }
    }

    @Override
    protected ResourceLoader getAdaptee() {
        if (resourceLoader != null) {
            return resourceLoader;
        } else {
            return super.getAdaptee();
        }
    }

    @Override
    public Resource getResource(String resourceLocation) {
        if (resourceLocation.startsWith("/")) {
            return new InputStreamResource(servletContext.getResourceAsStream(resourceLocation));
        } else {
            return super.getResource(resourceLocation);
        }
    }

    @Override
    public Resource[] getResources(String locationPattern) throws IOException {
        throw new UnsupportedOperationException();
    }

}