JarResource.java

// ========================================================================
// $Id: JarResource.java,v 1.19 2005/08/13 00:01:28 gregwilkins Exp $
// Copyright 1996-2004 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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.browsermob.proxy.jetty.util;

import org.apache.commons.logging.Log;
import org.browsermob.proxy.jetty.log.LogFactory;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.JarURLConnection;
import java.net.URL;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;


/* ------------------------------------------------------------ */
public class JarResource extends URLResource
{
    private static Log log = LogFactory.getLog(JarResource.class);

    protected transient JarURLConnection _jarConnection;
    
    /* -------------------------------------------------------- */
    JarResource(URL url)
    {
        super(url,null);
    }

    /* ------------------------------------------------------------ */
    public synchronized void release()
    {
        _jarConnection=null;
        super.release();
    }
    
    /* ------------------------------------------------------------ */
    protected boolean checkConnection()
    {
        super.checkConnection();
        try
        {
            if (_jarConnection!=_connection)
                newConnection();
        }
        catch(IOException e)
        {
            LogSupport.ignore(log,e);
            _jarConnection=null;
        }
        
        return _jarConnection!=null;
    }

    /* ------------------------------------------------------------ */
    protected void newConnection()
        throws IOException
    {
        _jarConnection=(JarURLConnection)_connection;
    }
    
    /* ------------------------------------------------------------ */
    /**
     * Returns true if the respresenetd resource exists.
     */
    public boolean exists()
    {
        if (_urlString.endsWith("!/"))
            return checkConnection();
        else
            return super.exists();
    }    

    /* ------------------------------------------------------------ */
    public File getFile()
        throws IOException
    {
        return null;
    }
    
    /* ------------------------------------------------------------ */
    public InputStream getInputStream()
        throws java.io.IOException
    {
        if (!_urlString.endsWith("!/"))
            return super.getInputStream();
        
        URL url = new URL(_urlString.substring(4,_urlString.length()-2));
        return url.openStream();
    }
    
    /* ------------------------------------------------------------ */
    public static void extract(Resource resource, File directory, boolean deleteOnExit)
        throws IOException
    {
        if(log.isDebugEnabled())log.debug("Extract "+resource+" to "+directory);
        JarInputStream jin = new JarInputStream(resource.getInputStream());
        JarEntry entry=null;
        while((entry=jin.getNextJarEntry())!=null)
        {
            File file=new File(directory,entry.getName());
            if (entry.isDirectory())
            {
                // Make directory
                if (!file.exists())
                    file.mkdirs();
            }
            else
            {
                // make directory (some jars don't list dirs)
                File dir = new File(file.getParent());
                if (!dir.exists())
                    dir.mkdirs();

                // Make file
                FileOutputStream fout = null;
                try
                {
                    fout = new FileOutputStream(file);
                    IO.copy(jin,fout);
                }
                finally
                {
                    IO.close(fout);
                }

                // touch the file.
                if (entry.getTime()>=0)
                    file.setLastModified(entry.getTime());
            }
            if (deleteOnExit)
                file.deleteOnExit();
        }
    }
    
    /* ------------------------------------------------------------ */
    public void extract(File directory, boolean deleteOnExit)
        throws IOException
    {
        extract(this,directory,deleteOnExit);
    }   
}