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/* Connection - jar url connection for java.net

   Copyright (C) 1999, 2002, 2003, 2005 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath 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, or (at your option)

any later version.

GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.java.net.protocol.jar;

import java.io.BufferedInputStream;

import java.io.ByteArrayInputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.IOException;

import java.net.JarURLConnection;

import java.net.MalformedURLException;

import java.net.ProtocolException;

import java.net.URL;

import java.net.URLConnection;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.HashMap;

import java.util.Hashtable;

import java.util.Locale;

import java.util.jar.JarEntry;

import java.util.jar.JarFile;

import java.util.jar.JarInputStream;

import java.util.zip.ZipEntry;

import java.util.zip.ZipFile;

/**

 * This subclass of java.net.JarURLConnection models a URLConnection via

 * the "jar" protocol.

 *

 * @author Kresten Krab Thorup (krab@gnu.org)

 */

public final class Connection extends JarURLConnection

{

  private static Hashtable file_cache = new Hashtable();

  /**

   * HTTP-style DateFormat, used to format the last-modified header.

   */

  private static SimpleDateFormat dateFormat

    = new SimpleDateFormat("EEE, dd MMM yyyy hh:mm:ss 'GMT'",

                           new Locale ("En", "Us", "Unix"));

  private JarFile jar_file;

  /**

   * Cached JarURLConnection objects.

   */

  static HashMap connectionCache = new HashMap();

  protected Connection(URL url)

    throws MalformedURLException

  {

    super(url);

  }

  public synchronized void connect() throws IOException

  {

    // Call is ignored if already connected.

    if (connected)

      return;

    if (getUseCaches())

      {

        jarFileURLConnection =

          (URLConnection) connectionCache.get(getJarFileURL());

        if (jarFileURLConnection == null)

          {

            jarFileURLConnection = getJarFileURL().openConnection();

            jarFileURLConnection.setUseCaches(true);

            jarFileURLConnection.connect();

            connectionCache.put(getJarFileURL(), jarFileURLConnection);

          }

      }

    else

      {

        jarFileURLConnection = getJarFileURL().openConnection();

        jarFileURLConnection.connect();

      }

    connected = true;

  }

  public InputStream getInputStream() throws IOException

  {

    if (!connected)

      connect();

    if (! doInput)

      throw new ProtocolException("Can't open InputStream if doInput is false");

    if (getEntryName() == null)

      {

        // This is a JarURLConnection for the entire jar file.  

        InputStream in = new BufferedInputStream

          (jarFileURLConnection.getInputStream());

        return new JarInputStream(in);

      }

    // Reaching this point, we're looking for an entry of a jar file.

    JarFile jarfile = null;

    try

      {

        jarfile = getJarFile ();

      }

    catch (IOException x)

      {

        /* ignore */

      }

    if (jarfile != null)

      {

        // this is the easy way...

        ZipEntry entry = jarfile.getEntry

          (gnu.java.net.protocol.file.Connection.unquote(getEntryName()));

        if (entry != null)

          return jarfile.getInputStream (entry);

      }

    else

      {

        // If the jar file is not local, ...

        JarInputStream zis = new JarInputStream(

                        jarFileURLConnection.getInputStream ());

        String entryName = gnu.java.net.protocol.file.Connection.unquote(getEntryName());

        // This is hideous, we're doing a linear search...

        for (ZipEntry entry = zis.getNextEntry();

             entry != null;

             entry = zis.getNextEntry())

          {

            if (entryName.equals(entry.getName()))

              {

                int size = (int) entry.getSize();

                byte[] data = new byte[size];

                zis.read (data, 0, size);

                return new ByteArrayInputStream (data);

              }

          }

      }

    throw new FileNotFoundException("No entry for \"" + getEntryName()

                                    + "\" in \""

                                    + getJarFileURL()

                                    + "\"");

  }

  public synchronized JarFile getJarFile() throws IOException

  {

    if (!connected)

      connect();

    if (! doInput)

      throw new ProtocolException("Can't open JarFile if doInput is false");

    if (jar_file != null)

      return jar_file;

    URL jarFileURL = getJarFileURL();

    if (jarFileURL.getProtocol().equals ("file")

        && jarFileURL.getHost().equals (""))

      {

        if (getUseCaches())

          {

            jar_file = (JarFile) file_cache.get (jarFileURL);

            if (jar_file == null)

              {

                jar_file = new JarFile

                  (gnu.java.net.protocol.file.Connection.unquote(jarFileURL.getFile()));

                file_cache.put (jarFileURL, jar_file);

              }

          }

        else

          jar_file = new JarFile

            (gnu.java.net.protocol.file.Connection.unquote(jarFileURL.getFile()));

      }

    else

      {

        URLConnection urlconn = jarFileURL.openConnection();

        InputStream is = urlconn.getInputStream();

        byte[] buf = new byte[4*1024];

        File f = File.createTempFile("cache", "jar");

        FileOutputStream fos = new FileOutputStream(f);

        int len = 0;

        while ((len = is.read(buf)) != -1)

          fos.write(buf, 0, len);

        fos.close();

        // Always verify the Manifest, open read only and delete when done.

        jar_file = new JarFile (f, true,

                                ZipFile.OPEN_READ | ZipFile.OPEN_DELETE);

      }

    return jar_file;

  }

  public String getHeaderField(String field)

  {

    try

      {

        if (!connected)

          connect();

        if (field.equals("content-type"))

          return guessContentTypeFromName(getJarEntry().getName());

        else if (field.equals("content-length"))

          return Long.toString(getJarEntry().getSize());

        else if (field.equals("last-modified"))

          {

            synchronized (dateFormat)

              {

                return dateFormat.format(new Date(getJarEntry().getTime()));

              }

          }

      }

    catch (IOException e)

      {

        // Fall through.

      }

    return null;

  }

  public int getContentLength()

  {

    if (!connected)

      return -1;

    try

      {

        return (int) getJarEntry().getSize();

      }

    catch (IOException e)

      {

        return -1;

      }

  }

  public long getLastModified()

  {

    if (!connected)

      return -1;

    try

      {

        return getJarEntry().getTime();

      }

    catch (IOException e)

      {

        return -1;

      }

  }

}