/*
    * ====================================================================
    *
    *  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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.http.auth;
  
  import java.util.Queue;
  
  import org.apache.http.annotation.NotThreadSafe;
  
  /**
   * This class provides detailed information about the state of the authentication process.
   *
   * @since 4.0
   */
  @NotThreadSafe
  public class AuthState {
  
      /** Actual state of authentication protocol */
      private AuthProtocolState state;
  
      /** Actual authentication scheme */
      private AuthScheme authScheme;
  
      /** Actual authentication scope */
      private AuthScope authScope;
  
      /** Credentials selected for authentication */
      private Credentials credentials;
  
      /** Available auth options */
      private Queue<AuthOption> authOptions;
  
      public AuthState() {
          super();
          this.state = AuthProtocolState.UNCHALLENGED;
      }
  
      /**
       * Resets the auth state.
       *
       * @since 4.2
       */
      public void reset() {
          this.state = AuthProtocolState.UNCHALLENGED;
          this.authOptions = null;
          this.authScheme = null;
          this.authScope = null;
          this.credentials = null;
      }
  
      /**
       * @since 4.2
       */
      public AuthProtocolState getState() {
          return this.state;
      }
  
      /**
       * @since 4.2
       */
      public void setState(final AuthProtocolState state) {
          this.state = state != null ? state : AuthProtocolState.UNCHALLENGED;
      }
  
      /**
       * Returns actual {@link AuthScheme}. May be null.
       */
      public AuthScheme getAuthScheme() {
          return this.authScheme;
      }
  
      /**
       * Returns actual {@link Credentials}. May be null.
       */
      public Credentials getCredentials() {
          return this.credentials;
     }
 
     /**
      * Updates the auth state with {@link AuthScheme} and {@link Credentials}.
      *
      * @param authScheme auth scheme. May not be null.
      * @param credentials user crednetials. May not be null.
      *
      * @since 4.2
      */
     public void update(final AuthScheme authScheme, final Credentials credentials) {
         if (authScheme == null) {
             throw new IllegalArgumentException("Auth scheme may not be null or empty");
         }
         if (credentials == null) {
             throw new IllegalArgumentException("Credentials may not be null or empty");
         }
         this.authScheme = authScheme;
         this.credentials = credentials;
         this.authOptions = null;
     }
 
     /**
      * Returns available {@link AuthOption}s. May be null.
      *
      * @since 4.2
      */
     public Queue<AuthOption> getAuthOptions() {
         return this.authOptions;
     }
 
     /**
      * Returns <code>true</code> if {@link AuthOption}s are available, <code>false</code>
      * otherwise.
      *
      * @since 4.2
      */
     public boolean hasAuthOptions() {
         return this.authOptions != null && !this.authOptions.isEmpty();
     }
 
     /**
      * Updates the auth state with a queue of {@link AuthOption}s.
      *
      * @param authOptions a queue of auth options. May not be null or empty.
      *
      * @since 4.2
      */
     public void update(final Queue<AuthOption> authOptions) {
         if (authOptions == null || authOptions.isEmpty()) {
             throw new IllegalArgumentException("Queue of auth options may not be null or empty");
         }
         this.authOptions = authOptions;
         this.authScheme = null;
         this.credentials = null;
     }
 
     /**
      * Invalidates the authentication state by resetting its parameters.
      *
      * @deprecated (4.2)  use {@link #reset()}
      */
     @Deprecated 
     public void invalidate() {
         reset();
     }
 
     /**
      * @deprecated (4.2) do not use
      */
     @Deprecated
     public boolean isValid() {
         return this.authScheme != null;
     }
 
     /**
      * Assigns the given {@link AuthScheme authentication scheme}.
      *
      * @param authScheme the {@link AuthScheme authentication scheme}
      *
      * @deprecated (4.2)  use {@link #update(AuthScheme, Credentials)}
      */
     @Deprecated 
     public void setAuthScheme(final AuthScheme authScheme) {
         if (authScheme == null) {
             reset();
             return;
         }
         this.authScheme = authScheme;
     }
 
     /**
      * Sets user {@link Credentials} to be used for authentication
      *
      * @param credentials User credentials
      *
      * @deprecated (4.2)  use {@link #update(AuthScheme, Credentials)}
      */
     @Deprecated
     public void setCredentials(final Credentials credentials) {
         this.credentials = credentials;
     }
 
     /**
      * Returns actual {@link AuthScope} if available
      *
      * @return actual authentication scope if available, <code>null</code otherwise
      *
      * @deprecated (4.2)  do not use.
      */
     @Deprecated
     public AuthScope getAuthScope() {
         return this.authScope;
     }
 
     /**
      * Sets actual {@link AuthScope}.
      *
      * @param authScope Authentication scope
      *
      * @deprecated (4.2)  do not use.
      */
     @Deprecated
     public void setAuthScope(final AuthScope authScope) {
         this.authScope = authScope;
     }
 
     @Override
     public String toString() {
         StringBuilder buffer = new StringBuilder();
         buffer.append("state:").append(this.state).append(";");
         if (this.authScheme != null) {
             buffer.append("auth scheme:").append(this.authScheme.getSchemeName()).append(";");
         }
         if (this.credentials != null) {
             buffer.append("credentials present");
         }
         return buffer.toString();
     }
 
 }