WrappedDirectInputStream.java from DrJava at Krugle

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/*BEGIN_COPYRIGHT_BLOCK*

PLT Utilities BSD License

Copyright (c) 2007 JavaPLT group at Rice University
All rights reserved.

Developed by:   Java Programming Languages Team
                Rice University
                http://www.cs.rice.edu/~javaplt/

Redistribution and use in source and binary forms, with or without modification, are permitted 
provided that the following conditions are met:

    - Redistributions of source code must retain the above copyright notice, this list of conditions 
      and the following disclaimer.
    - Redistributions in binary form must reproduce the above copyright notice, this list of 
      conditions and the following disclaimer in the documentation and/or other materials provided 
      with the distribution.
    - Neither the name of the JavaPLT group, Rice University, nor the names of the library's 
      contributors may be used to endorse or promote products derived from this software without 
      specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR 
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND 
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package edu.rice.cs.plt.io;

import java.io.*;

/**
 * An implementation of {@code DirectInputStream} that inherits that class's default implementations
 * and delegates all other operations to the wrapped {@code InputStream}.
 */
public class WrappedDirectInputStream extends DirectInputStream {
  private InputStream _stream;
  
  public WrappedDirectInputStream(InputStream stream) { _stream = stream; }
  
  @Override public int available() throws IOException { return _stream.available(); }
  
  @Override public void close() throws IOException { _stream.close(); }
  
  @Override public void mark(int readAheadLimit) { _stream.mark(readAheadLimit); }
  
  @Override public boolean markSupported() { return _stream.markSupported(); }
  
  @Override public int read() throws IOException { return _stream.read(); }
  
  @Override public int read(byte[] bbuf) throws IOException { return _stream.read(bbuf); }
  
  @Override public int read(byte[] bbuf, int offset, int length) throws IOException {
    return _stream.read(bbuf, offset, length);
  }
  
  @Override public void reset() throws IOException { _stream.reset(); }
  
  @Override public long skip(long n) throws IOException { return _stream.skip(n); }
  
  /** 
   * If the input is a {@code DirectInputStream}, cast it; otherwise, create a
   * {@code WrappedDirectInputStream}.
   */
  public static DirectInputStream makeDirect(InputStream stream) {
    if (stream instanceof DirectInputStream) { return (DirectInputStream) stream; }
    else { return new WrappedDirectInputStream(stream); }
  }

}
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