content: /*
   * 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.apache.kafka.common.header.internals;
  
  import org.apache.kafka.common.header.Header;
  import org.apache.kafka.common.utils.Utils;
  
  import java.nio.ByteBuffer;
  import java.util.Arrays;
  import java.util.Objects;
  
  public class RecordHeader implements Header {
      private ByteBuffer keyBuffer;
      private String key;
      private ByteBuffer valueBuffer;
      private byte[] value;
  
      public RecordHeader(String key, byte[] value) {
          Objects.requireNonNull(key, "Null header keys are not permitted");
          this.key = key;
          this.value = value;
      }
  
      public RecordHeader(ByteBuffer keyBuffer, ByteBuffer valueBuffer) {
          this.keyBuffer = Objects.requireNonNull(keyBuffer, "Null header keys are not permitted");
          this.valueBuffer = valueBuffer;
      }
      
      public String key() {
          if (key == null) {
              key = Utils.utf8(keyBuffer, keyBuffer.remaining());
              keyBuffer = null;
          }
          return key;
      }
  
      public byte[] value() {
          if (value == null && valueBuffer != null) {
              value = Utils.toArray(valueBuffer);
              valueBuffer = null;
          }
          return value;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o)
              return true;
          if (o == null || getClass() != o.getClass())
              return false;
  
          RecordHeader header = (RecordHeader) o;
          return Objects.equals(key(), header.key()) &&
                 Arrays.equals(value(), header.value());
      }
  
      @Override
      public int hashCode() {
          int result = key().hashCode();
          result = 31 * result + Arrays.hashCode(value());
          return result;
      }
  
      @Override
      public String toString() {
          return "RecordHeader(key = " + key() + ", value = " + Arrays.toString(value()) + ")";
      }
  
  }
  