/*
 * Copyright 2013 Guidewire Software, Inc.
 */

package gw.internal.gosu.compiler.protocols.gosuclass;

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.util.concurrent.ConcurrentHashMap;

/**
 */
public class Handler extends URLStreamHandler
{
  public static final ConcurrentHashMap<URL, URL> _visited = new ConcurrentHashMap<URL, URL>();

  public static final Handler INSTANCE = new Handler();

  @Override
  protected URLConnection openConnection( URL u ) throws IOException
  {
    if( _visited.containsKey( u ) )
    {
      //## todo: we should try hard so that this never happens -- the type sys tries to resolve inner classes,
      // which come back around here and always fail
      return null;
    }
    _visited.put( u, u );
    try
    {
      GosuClassesUrlConnection connection = new GosuClassesUrlConnection( u );
      return connection.isValid() ? connection : null;
    }
    finally
    {
      _visited.remove( u );
    }
  }

  @Override
  protected int hashCode( URL u )
  {
    return (u.getProtocol() + u.getHost() + u.getPath()).hashCode();
  }

  @Override
  protected boolean equals( URL u1, URL u2 )
  {
    if( u1 == u2 )
    {
      return true;
    }
    if( u1 == null || u2 == null )
    {
      return false;
    }
    return (u1.getProtocol() + u1.getHost() + u1.getPath()).equals( u2.getProtocol() + u2.getHost() + u2.getPath() );
  }
}