package org.eclipse.aether.transport.http;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   */
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.http.HttpHost;
  import org.apache.http.auth.AuthScheme;
  import org.apache.http.client.AuthCache;
  
  /**
   * Auth scheme cache that upon clearing releases all cached schemes into a pool for future reuse by other requests,
   * thereby reducing challenge-response roundtrips.
   */
  final class SharingAuthCache
      implements AuthCache
  {
  
      private final LocalState state;
  
      private final Map<HttpHost, AuthScheme> authSchemes;
  
      public SharingAuthCache( LocalState state )
      {
          this.state = state;
          authSchemes = new HashMap<HttpHost, AuthScheme>();
      }
  
      private static HttpHost toKey( HttpHost host )
      {
          if ( host.getPort() <= 0 )
          {
              int port = host.getSchemeName().equalsIgnoreCase( "https" ) ? 443 : 80;
              return new HttpHost( host.getHostName(), port, host.getSchemeName() );
          }
          return host;
      }
  
      public AuthScheme get( HttpHost host )
      {
          host = toKey( host );
          AuthScheme authScheme = authSchemes.get( host );
          if ( authScheme == null )
          {
              authScheme = state.getAuthScheme( host );
              authSchemes.put( host, authScheme );
          }
          return authScheme;
      }
  
      public void put( HttpHost host, AuthScheme authScheme )
      {
          if ( authScheme != null )
          {
              authSchemes.put( toKey( host ), authScheme );
          }
          else
          {
              remove( host );
          }
      }
  
      public void remove( HttpHost host )
      {
          authSchemes.remove( toKey( host ) );
      }
  
      public void clear()
      {
          share();
          authSchemes.clear();
      }
  
      private void share()
      {
          for ( Map.Entry<HttpHost, AuthScheme> entry : authSchemes.entrySet() )
          {
              state.setAuthScheme( entry.getKey(), entry.getValue() );
          }
      }
  
     @Override
     public String toString()
     {
         return authSchemes.toString();
     }
 
 }