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 io.jafka.message;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.ByteBuffer;
  
  /**
   * Convert ByteBuffer to InputStream
   * @author adyliu (imxylz@gmail.com)
   * @since 1.0
   */
  class ByteBufferBackedInputStream extends InputStream {
  
      private final ByteBuffer buffer;
  
      public ByteBufferBackedInputStream(ByteBuffer buffer) {
          this.buffer = buffer;
      }
  
      @Override
      public int read() throws IOException {
          return buffer.hasRemaining() ? (buffer.get() & 0xFF) : -1;
      }
  
      @Override
      public int read(byte[] b, int off, int len) throws IOException {
          if (buffer.hasRemaining()) {
              int realLen = Math.min(len, buffer.remaining());
              buffer.get(b, off, realLen);
              return realLen;
          }
          return -1;
      }
  
  }
  