/*
    * Copyright 2014 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.handler.ssl;
  
  import io.netty.util.internal.EmptyArrays;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Set;
  
  /**
   * This class will not do any filtering of ciphers suites.
   */
  public final class IdentityCipherSuiteFilter implements CipherSuiteFilter {
  
      /**
       * Defaults to default ciphers when provided ciphers are null
       */
      public static final IdentityCipherSuiteFilter INSTANCE = new IdentityCipherSuiteFilter(true);
  
      /**
       * Defaults to supported ciphers when provided ciphers are null
       */
      public static final IdentityCipherSuiteFilter INSTANCE_DEFAULTING_TO_SUPPORTED_CIPHERS =
              new IdentityCipherSuiteFilter(false);
  
      private final boolean defaultToDefaultCiphers;
  
      private IdentityCipherSuiteFilter(boolean defaultToDefaultCiphers) {
          this.defaultToDefaultCiphers = defaultToDefaultCiphers;
      }
  
      @Override
      public String[] filterCipherSuites(Iterable<String> ciphers, List<String> defaultCiphers,
              Set<String> supportedCiphers) {
          if (ciphers == null) {
              return defaultToDefaultCiphers ?
                      defaultCiphers.toArray(EmptyArrays.EMPTY_STRINGS) :
                      supportedCiphers.toArray(EmptyArrays.EMPTY_STRINGS);
          } else {
              List<String> newCiphers = new ArrayList<String>(supportedCiphers.size());
              for (String c : ciphers) {
                  if (c == null) {
                      break;
                  }
                  newCiphers.add(c);
              }
              return newCiphers.toArray(EmptyArrays.EMPTY_STRINGS);
          }
      }
  }