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   /*
    * Copyright 2016 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.buffer.ByteBuf;
  import io.netty.buffer.ByteBufAllocator;
  import io.netty.util.AbstractReferenceCounted;
  import io.netty.util.IllegalReferenceCountException;
  import io.netty.util.internal.ObjectUtil;
  
  /**
   * A PEM encoded value.
   *
   * @see PemEncoded
   * @see PemPrivateKey#toPEM(ByteBufAllocator, boolean, java.security.PrivateKey)
   * @see PemX509Certificate#toPEM(ByteBufAllocator, boolean, java.security.cert.X509Certificate[])
   */
  class PemValue extends AbstractReferenceCounted implements PemEncoded {
  
      private final ByteBuf content;
  
      private final boolean sensitive;
  
      PemValue(ByteBuf content, boolean sensitive) {
          this.content = ObjectUtil.checkNotNull(content, "content");
          this.sensitive = sensitive;
      }
  
      @Override
      public boolean isSensitive() {
          return sensitive;
      }
  
      @Override
      public ByteBuf content() {
          int count = refCnt();
          if (count <= 0) {
              throw new IllegalReferenceCountException(count);
          }
  
          return content;
      }
  
      @Override
      public PemValue copy() {
          return replace(content.copy());
      }
  
      @Override
      public PemValue duplicate() {
          return replace(content.duplicate());
      }
  
      @Override
      public PemValue retainedDuplicate() {
          return replace(content.retainedDuplicate());
      }
  
      @Override
      public PemValue replace(ByteBuf content) {
          return new PemValue(content, sensitive);
      }
  
      @Override
      public PemValue touch() {
          return (PemValue) super.touch();
      }
  
      @Override
      public PemValue touch(Object hint) {
          content.touch(hint);
          return this;
      }
  
      @Override
      public PemValue retain() {
          return (PemValue) super.retain();
      }
  
      @Override
      public PemValue retain(int increment) {
          return (PemValue) super.retain(increment);
      }
  
      @Override
      protected void deallocate() {
         if (sensitive) {
             SslUtils.zeroout(content);
         }
         content.release();
     }
 }