package org.eclipse.aether.util.repository;
   
   /*
    * 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.Map;
  import static java.util.Objects.requireNonNull;
  
  import org.eclipse.aether.repository.Authentication;
  import org.eclipse.aether.repository.AuthenticationContext;
  import org.eclipse.aether.repository.AuthenticationDigest;
  
  /**
   * Authentication block that manages a single authentication key and its component value. In this context, component
   * refers to an object whose behavior is solely dependent on its implementation class.
   */
  final class ComponentAuthentication
      implements Authentication
  {
  
      private final String key;
  
      private final Object value;
  
      ComponentAuthentication( String key, Object value )
      {
          this.key = requireNonNull( key, "authentication key cannot be null" );
          if ( key.length() == 0 )
          {
              throw new IllegalArgumentException( "authentication key cannot be empty" );
          }
          this.value = value;
      }
  
      public void fill( AuthenticationContext context, String key, Map<String, String> data )
      {
          requireNonNull( context, "context cannot be null" );
          context.put( this.key, value );
      }
  
      public void digest( AuthenticationDigest digest )
      {
          requireNonNull( digest, "digest cannot be null" );
          if ( value != null )
          {
              digest.update( key, value.getClass().getName() );
          }
      }
  
      @Override
      public boolean equals( Object obj )
      {
          if ( this == obj )
          {
              return true;
          }
          if ( obj == null || !getClass().equals( obj.getClass() ) )
          {
              return false;
          }
          ComponentAuthentication that = (ComponentAuthentication) obj;
          return key.equals( that.key ) && eqClass( value, that.value );
      }
  
      private static <T> boolean eqClass( T s1, T s2 )
      {
          return ( s1 == null ) ? s2 == null : s2 != null && s1.getClass().equals( s2.getClass() );
      }
  
      @Override
      public int hashCode()
      {
          int hash = 17;
          hash = hash * 31 + key.hashCode();
          hash = hash * 31 + ( ( value != null ) ? value.getClass().hashCode() : 0 );
          return hash;
      }
  
      @Override
      public String toString()
      {
          return key + "=" + value;
      }
 
 }