org.guzz.web.context.ContextLoader.java Source code

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Here is the source code for org.guzz.web.context.ContextLoader.java

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/*
 * Copyright 2008-2009 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 org.guzz.web.context;

import javax.servlet.ServletContext;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.guzz.Configuration;
import org.guzz.GuzzContext;
import org.guzz.io.FileResource;
import org.guzz.util.CloseUtil;

/**
 * 
 * 
 *
 * @author liukaixuan(liukaixuan@gmail.com)
 */
public class ContextLoader {

    private transient static final Log log = LogFactory.getLog(ContextLoader.class);

    /**
     * Config param for the root WebApplicationContext implementation class to
     * use: "<code>contextClass</code>"
     */
    public static final String CONTEXT_CLASS_PARAM = "contextClass";

    /**
    * Name of servlet context parameter (i.e., "<code>guzzConfigLocation</code>")
    * that can specify the config location for the root context, falling back
    * to the implementation's default otherwise.
    */
    public static final String CONFIG_LOCATION_PARAM = "guzzConfigLocation";

    private GuzzContext guzzContext;

    public GuzzContext initGuzzContext(ServletContext sc) throws Exception {
        String configFile = sc.getInitParameter(CONFIG_LOCATION_PARAM);
        if (configFile == null) {
            configFile = "/WEB-INF/guzz.xml";
        }

        String name = sc.getRealPath(configFile);

        FileResource fr = new FileResource(name);

        try {
            GuzzContext gf = new Configuration(fr).newGuzzContext();

            return initGuzzContext(sc, gf);
        } finally {
            CloseUtil.close(fr);
        }
    }

    public GuzzContext initGuzzContext(ServletContext sc, GuzzContext guzzContext) throws Exception {
        sc.setAttribute(GuzzWebApplicationContextUtil.GUZZ_SERVLET_CONTEXT_KEY, guzzContext);
        this.guzzContext = guzzContext;

        return guzzContext;
    }

    public void shutdown(ServletContext sc) {
        if (guzzContext != null) {
            try {
                guzzContext.shutdown();
            } catch (Exception e) {
                log.error("error whiling shutting down guzzContext", e);
            }

            sc.removeAttribute(GuzzWebApplicationContextUtil.GUZZ_SERVLET_CONTEXT_KEY);
            guzzContext = null;
        }
    }

    public GuzzContext getGuzzContext() {
        return guzzContext;
    }

}