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.activemq.transport.nio;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.BufferUnderflowException;
  import java.nio.ByteBuffer;
  
  /**
   * An optimized buffered input stream for Tcp
   * 
   * 
   */
  public class NIOInputStream extends InputStream {
  
      protected int count;
      protected int position;
      private final ByteBuffer in;
  
      public NIOInputStream(ByteBuffer in) {
          this.in = in;
      }
  
      public int read() throws IOException {
          try {
              int rc = in.get() & 0xff;
              return rc;
          } catch (BufferUnderflowException e) {
              return -1;
          }
      }
  
      public int read(byte b[], int off, int len) throws IOException {
          if (in.hasRemaining()) {
              int rc = Math.min(len, in.remaining());
              in.get(b, off, rc);
              return rc;
          } else {
              return len == 0 ? 0 : -1;
          }
      }
  
      public long skip(long n) throws IOException {
          int rc = Math.min((int)n, in.remaining());
          in.position(in.position() + rc);
          return rc;
      }
  
      public int available() throws IOException {
          return in.remaining();
      }
  
      public boolean markSupported() {
          return false;
      }
  
      public void close() throws IOException {
      }
  }
  