org.onecmdb.web.remote.ClassPathController.java Source code

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Here is the source code for org.onecmdb.web.remote.ClassPathController.java

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/*
 * Lokomo OneCMDB - An Open Source Software for Configuration
 * Management of Datacenter Resources
 *
 * Copyright (C) 2006 Lokomo Systems AB
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 * 
 * Lokomo Systems AB can be contacted via e-mail: info@lokomo.com or via
 * paper mail: Lokomo Systems AB, Svrdvgen 27, SE-182 33
 * Danderyd, Sweden.
 *
 */
package org.onecmdb.web.remote;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.UrlFilenameViewController;

public class ClassPathController extends UrlFilenameViewController {
    private static final int BUF_SIZE = 8192;
    private Log log = null;
    private String pathPrefix = "/classpath/";
    private URLClassLoader additionalLoader = null;

    public void setLog(Log log) {
        this.log = log;
    }

    public Log getLog() {
        if (this.log == null) {
            this.log = LogFactory.getLog(this.getClass());
        }
        return (this.log);
    }

    public void init() {
        getLog().info("INIT: Classpath controller.");
    }

    /*
     * Make the path prefix spring configurable.
     */
    public void setPathPrefix(String prefix) {
        this.pathPrefix = prefix;
    }

    public void setAdditionURLS(List<String> urlStrings) throws MalformedURLException {
        List<URL> urls = new ArrayList<URL>();
        for (String urlString : urlStrings) {
            urls.add(new URL(urlString));
            getLog().info("Adding additional url <" + urlString + ">");
        }
        this.additionalLoader = new URLClassLoader(urls.toArray(new URL[0]));
    }

    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse resp) {

        try {
            String path = request.getPathInfo();
            // Remove Prefix
            String resource = path;
            if (path.startsWith(pathPrefix)) {
                resource = path.substring(pathPrefix.length());
            }
            getLog().info("Load Resource <" + path + "> - " + resource);
            System.out.println("Load Resource <" + path + "> - " + resource);
            OutputStream out = resp.getOutputStream();

            InputStream in = this.getClass().getClassLoader().getResourceAsStream(resource);

            if (in == null) {
                // Check additional loader.
                if (additionalLoader != null) {
                    in = additionalLoader.getResourceAsStream(resource);
                }
            }

            if (in == null) {
                getLog().info("Resource <" + resource + "> not found!");
                resp.setStatus(404);
                return (null);
            }

            try {
                // Transfer stream
                boolean eof = false;
                byte data[] = new byte[BUF_SIZE];
                long totalBytes = 0;
                while (!eof) {
                    int len = in.read(data, 0, BUF_SIZE);
                    if (len < 0) {
                        eof = true;
                        continue;
                    }
                    out.write(data, 0, len);
                    totalBytes += len;
                }
                getLog().info("Resource <" + resource + "> bytes " + totalBytes);
            } finally {
                try {
                    in.close();
                } catch (Exception e) {
                    // Not much to do...
                }
                out.flush();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return (null);
    }

}