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.cassandra.io.util;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.function.Supplier;
  import java.util.zip.Checksum;
  
  public class ChecksumedDataOutputPlus implements DataOutputPlus, Checksumed
  {
      private final DataOutputPlus delegate;
      private final Checksum checksum;
  
      public ChecksumedDataOutputPlus(DataOutputPlus delegate, Checksum checksum)
      {
          this.delegate = delegate;
          this.checksum = checksum;
      }
  
      public ChecksumedDataOutputPlus(DataOutputPlus delegate, Supplier<Checksum> fn)
      {
          this(delegate, fn.get());
      }
  
      public DataOutputPlus delegate()
      {
          return delegate;
      }
  
      @Override
      public Checksum checksum()
      {
          return checksum;
      }
  
      @Override
      public void write(ByteBuffer buffer) throws IOException
      {
          checksum.update(buffer.duplicate());
          delegate().write(buffer);
      }
  
      @Override
      public void write(int b) throws IOException
      {
          checksum.update(b);
          delegate().write(b);
      }
  
      @Override
      public void write(byte[] b) throws IOException
      {
          checksum.update(b);
          delegate().write(b);
      }
  
      @Override
      public void write(byte[] b, int off, int len) throws IOException
      {
          checksum.update(b, off, len);
          delegate().write(b, off, len);
      }
  
      @Override
      public void writeByte(int v) throws IOException
      {
          checksum.update(v);
          delegate().writeByte(v);
      }
  
      private byte writeBuffer[] = new byte[8];
  
      @Override
      public void writeLong(long v) throws IOException
      {
          writeBuffer[0] = (byte)(v >>> 56);
          writeBuffer[1] = (byte)(v >>> 48);
          writeBuffer[2] = (byte)(v >>> 40);
          writeBuffer[3] = (byte)(v >>> 32);
          writeBuffer[4] = (byte)(v >>> 24);
          writeBuffer[5] = (byte)(v >>> 16);
          writeBuffer[6] = (byte)(v >>>  8);
          writeBuffer[7] = (byte)(v >>>  0);
          checksum.update(writeBuffer);
          delegate().writeLong(v);
      }
  
      @Override
      public void writeUTF(String s) throws IOException
      {
          throw new UnsupportedOperationException("TODO");
      }
  }
  