/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
 * 
 * This file is part of the SmallMind Code Project.
 * 
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 * 
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 * 
 * ...or...
 * 
 * 2) The terms of the Apache License, Version 2.0.
 * 
 * The SmallMind Code Project 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 or Apache License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 * <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
 * 
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.spark.singularity.boot;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarInputStream;

public class SingularityJarURLConnection extends URLConnection {

  public SingularityJarURLConnection (URL url) {

    super(url);
  }

  @Override
  public void connect ()
    throws IOException {

  }

  @Override
  public InputStream getInputStream ()
    throws IOException {

    JarFile jarFile;
    JarEntry jarEntry;
    String entryName;
    int doubleBangPos = url.getPath().indexOf("!!/");
    int singBangPos = url.getPath().indexOf("!/", doubleBangPos + 3);

    jarFile = new JarFile(new URL(url.getPath().substring(0, doubleBangPos)).getFile());
    entryName = url.getPath().substring(doubleBangPos + 3, singBangPos);

    if ((jarEntry = jarFile.getJarEntry(entryName)) != null) {

      JarInputStream innerJarInputStream = new JarInputStream(jarFile.getInputStream(jarEntry));
      JarEntry innerJarEntry;
      String innerEntryName;

      innerEntryName = url.getPath().substring(singBangPos + 2);

      while ((innerJarEntry = innerJarInputStream.getNextJarEntry()) != null) {
        if (innerJarEntry.getName().equals(innerEntryName)) {
          return innerJarInputStream;
        }
      }
    }

    throw new FileNotFoundException(url.getPath());
  }

  @Override
  public int getContentLength () {

    return 0;
  }
}