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.nio.ByteBuffer;
  
  /**
   * Input stream around a single ByteBuffer.
   */
  public class DataInputBuffer extends RebufferingInputStream
  {
      private static ByteBuffer slice(byte[] buffer, int offset, int length)
      {
          ByteBuffer buf = ByteBuffer.wrap(buffer);
          if (offset > 0 || length < buf.capacity())
          {
              buf.position(offset);
              buf.limit(offset + length);
              buf = buf.slice();
          }
          return buf;
      }
  
      /**
       * @param buffer
       * @param duplicate Whether or not to duplicate the buffer to ensure thread safety
       */
      public DataInputBuffer(ByteBuffer buffer, boolean duplicate)
      {
          super(duplicate ? buffer.duplicate() : buffer);
      }
  
      public DataInputBuffer(byte[] buffer, int offset, int length)
      {
          super(slice(buffer, offset, length));
      }
  
      public DataInputBuffer(byte[] buffer)
      {
          super(ByteBuffer.wrap(buffer));
      }
  
      @Override
      protected void reBuffer()
      {
          //nope, we don't rebuffer, we are done!
      }
  
      @Override
      public int available()
      {
          return buffer.remaining();
      }
  
      public ByteBuffer buffer()
      {
          return buffer;
      }
  
      @Override
      public void close() {}
  }
  