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// Connection.java - Implementation of URLConnection for gcjlib

// protocol.

/* Copyright (C) 2003  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the

Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for

details.  */

package gnu.java.net.protocol.gcjlib;

import java.io.InputStream;

import java.io.IOException;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

import gnu.gcj.Core;

import gnu.gcj.runtime.SharedLibHelper;

import gnu.java.net.protocol.core.CoreInputStream;

/**

 * @author Tom Tromey <tromey@redhat.com>

 * @date January 10, 2003

 */

class Connection extends URLConnection

{

  String solib;

  String name;

  Core core;

  public Connection (URL url) throws MalformedURLException

  {

    super (url);

    int index = url.getFile().indexOf ("!/");

    if (index == -1)

      throw new MalformedURLException ("couldn't find !/ in gcjlib URL");

    name = url.getFile().substring (index + 2);

    solib = url.getFile().substring (0, index);

  }

  public void connect() throws IOException

  {

    if (core != null)

      return;

    // We can't create a new SharedLibHelper here, since we don't know

    // what parent class loader to use.

    SharedLibHelper helper = SharedLibHelper.findHelper(solib);

    if (helper == null)

      throw new IOException("library not loaded: " + solib);

    core = helper.findCore(name);

    if (core == null)

      throw new IOException("couldn't find core object: " + name);

  }

  public InputStream getInputStream() throws IOException

  {

    connect();

    return new CoreInputStream(core);

  }

  public String getHeaderField(String field)

  {

    try

      {

        if (!connected)

          connect();

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

          return guessContentTypeFromName(name);

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

          return Long.toString(core.length);

      }

    catch (IOException e)

      {

        // Fall through.

      }

    return null;

  }

}