printstream.java

来自「gcc3.2.1源代码」· Java 代码 · 共 303 行

// PrintStream.java - Print string representations

/* Copyright (C) 1998, 1999, 2001  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

package java.io;
import gnu.gcj.convert.UnicodeToBytes;

/**
 * @author Tom Tromey <[e-mail]>
 * @date September 24, 1998 
 */

/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
 * "The Java Language Specification", ISBN 0-201-63451-1
 * Status:  Believed complete and correct to 1.3
 */

public class PrintStream extends FilterOutputStream
{
  /* Notice the implementation is quite similar to OutputStreamWriter.
   * This leads to some minor duplication, because neither inherits
   * from the other, and we want to maximize performance. */

  public boolean checkError ()
  {
    flush();
    return error;
  }

  public void close ()
  {
    try
      {
	flush();
	out.close();
      }
    catch (InterruptedIOException iioe)
      {
	Thread.currentThread().interrupt();
      }
    catch (IOException e)
      {
	setError ();
      }
  }

  public void flush ()
  {
    try
      {
	out.flush();
      }
    catch (InterruptedIOException iioe)
      {
	Thread.currentThread().interrupt();
      }
    catch (IOException e)
      {
	setError ();
      }
  }

  private synchronized void print (String str, boolean println)
  {
    try
      {
        writeChars(str, 0, str.length());
	if (println)
	  writeChars(line_separator, 0, line_separator.length);
	if (auto_flush)
	  flush();
      }
    catch (InterruptedIOException iioe)
      {
	Thread.currentThread().interrupt();
      }
    catch (IOException e)
      {
	setError ();
      }
  }

  private synchronized void print (char[] chars, int pos, int len,
				   boolean println)
  {
    try
      {
        writeChars(chars, pos, len);
	if (println)
	  writeChars(line_separator, 0, line_separator.length);
	if (auto_flush)
	  flush();
      }
    catch (InterruptedIOException iioe)
      {
	Thread.currentThread().interrupt();
      }
    catch (IOException e)
      {
	setError ();
      }
  }

  private void writeChars(char[] buf, int offset, int count)
    throws IOException
  {
    while (count > 0)
      {
	converter.setOutput(work_bytes, 0);
	int converted = converter.write(buf, offset, count);
	offset += converted;
	count -= converted;
	out.write(work_bytes, 0, converter.count);
      }
  }

  private void writeChars(String str, int offset, int count)
    throws IOException
  {
    while (count > 0)
      {
	converter.setOutput(work_bytes, 0);
	int converted = converter.write(str, offset, count, work);
	offset += converted;
	count -= converted;
	out.write(work_bytes, 0, converter.count);
      }
  }

  public void print (boolean bool)
  {
    print(String.valueOf(bool), false);
  }

  public void print (int inum)
  {
    print(String.valueOf(inum), false);
  }

  public void print (long lnum)
  {
    print(String.valueOf(lnum), false);
  }

  public void print (float fnum)
  {
    print(String.valueOf(fnum), false);
  }

  public void print (double dnum)
  {
    print(String.valueOf(dnum), false);
  }

  public void print (Object obj)
  {
    print(obj == null ? "null" : obj.toString(), false);
  }

  public void print (String str)
  {
    print(str == null ? "null" : str, false);
  }

  public synchronized void print (char ch)
  {
    work[0] = ch;
    print(work, 0, 1, false);
  }

  public void print (char[] charArray)
  {
    print(charArray, 0, charArray.length, false);
  }

  public void println ()
  {
    print(line_separator, 0, line_separator.length, false);
  }

  public void println (boolean bool)
  {
    print(String.valueOf(bool), true);
  }

  public void println (int inum)
  {
    print(String.valueOf(inum), true);
  }

  public void println (long lnum)
  {
    print(String.valueOf(lnum), true);
  }

  public void println (float fnum)
  {
    print(String.valueOf(fnum), true);
  }

  public void println (double dnum)
  {
    print(String.valueOf(dnum), true);
  }

  public void println (Object obj)
  {
    print(obj == null ? "null" : obj.toString(), true);
  }

  public void println (String str)
  {
    print (str == null ? "null" : str, true);
  }

  public synchronized void println (char ch)
  {
    work[0] = ch;
    print(work, 0, 1, true);
  }

  public void println (char[] charArray)
  {
    print(charArray, 0, charArray.length, true);
  }

  public PrintStream (OutputStream out)
  {
    this(out, false);
  }

  public PrintStream (OutputStream out, boolean af)
  {
    super(out);
    converter = UnicodeToBytes.getDefaultEncoder();
    error = false;
    auto_flush = af;
  }

  protected void setError ()
  {
    error = true;
  }

  public void write (int oneByte)
  {
    try
      {
	out.write(oneByte);
	if (auto_flush && oneByte == '\n')
	  flush();
      }
    catch (InterruptedIOException iioe)
      {
	Thread.currentThread().interrupt();
      }
    catch (IOException e)
      {
	setError ();
      }
  }

  public void write (byte[] buffer, int offset, int count)
  {
    try
      {
	out.write(buffer, offset, count);
	if (auto_flush)
	  flush();
      }
    catch (InterruptedIOException iioe)
      {
	Thread.currentThread().interrupt();
      }
    catch (IOException e)
      {
	setError ();
      }
  }

  UnicodeToBytes converter;

  // Work buffer of characters for converter.
  char[] work = new char[100];
  // Work buffer of bytes where we temporarily keep converter output.
  byte[] work_bytes = new byte[100];

  // True if error occurred.
  private boolean error;
  // True if auto-flush.
  private boolean auto_flush;

  // Line separator string.
  private static final char[] line_separator
    = System.getProperty("line.separator").toCharArray();
}