/*
    * 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.
   */
  package org.eclipse.aether.util.repository;
  
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Map;
  
  import org.eclipse.aether.repository.Authentication;
  import org.eclipse.aether.repository.AuthenticationContext;
  import org.eclipse.aether.repository.AuthenticationDigest;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Authentication that aggregates other authentication blocks. When multiple input authentication blocks provide the
   * same authentication key, the last written value wins.
   */
  final class ChainedAuthentication implements Authentication {
  
      private final Authentication[] authentications;
  
      ChainedAuthentication(Authentication... authentications) {
          if (authentications != null && authentications.length > 0) {
              this.authentications = authentications.clone();
          } else {
              this.authentications = new Authentication[0];
          }
      }
  
      ChainedAuthentication(Collection<? extends Authentication> authentications) {
          if (authentications != null && !authentications.isEmpty()) {
              this.authentications = authentications.toArray(new Authentication[0]);
          } else {
              this.authentications = new Authentication[0];
          }
      }
  
      public void fill(AuthenticationContext context, String key, Map<String, String> data) {
          requireNonNull(context, "context cannot be null");
          for (Authentication authentication : authentications) {
              authentication.fill(context, key, data);
          }
      }
  
      public void digest(AuthenticationDigest digest) {
          requireNonNull(digest, "digest cannot be null");
          for (Authentication authentication : authentications) {
              authentication.digest(digest);
          }
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj == null || !getClass().equals(obj.getClass())) {
              return false;
          }
          ChainedAuthentication that = (ChainedAuthentication) obj;
          return Arrays.equals(authentications, that.authentications);
      }
  
      @Override
      public int hashCode() {
          return Arrays.hashCode(authentications);
      }
  
      @Override
      public String toString() {
          StringBuilder buffer = new StringBuilder(256);
          for (Authentication authentication : authentications) {
              if (buffer.length() > 0) {
                  buffer.append(", ");
              }
              buffer.append(authentication);
          }
          return buffer.toString();
      }
  }