563 lines
16 KiB
Java
563 lines
16 KiB
Java
/* PrintStream.java -- OutputStream for printing output
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Copyright (C) 1998, 1999, 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.io;
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import gnu.gcj.convert.UnicodeToBytes;
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/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
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* "The Java Language Specification", ISBN 0-201-63451-1
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* Status: Believed complete and correct to 1.3
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*/
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/**
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* This class prints Java primitive values and object to a stream as
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* text. None of the methods in this class throw an exception. However,
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* errors can be detected by calling the <code>checkError()</code> method.
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* Additionally, this stream can be designated as "autoflush" when
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* created so that any writes are automatically flushed to the underlying
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* output sink when the current line is terminated.
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* <p>
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* This class converts char's into byte's using the system default encoding.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Tom Tromey (tromey@cygnus.com)
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*/
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public class PrintStream extends FilterOutputStream
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{
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/* Notice the implementation is quite similar to OutputStreamWriter.
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* This leads to some minor duplication, because neither inherits
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* from the other, and we want to maximize performance. */
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// Line separator string.
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private static final char[] line_separator
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= System.getProperty("line.separator").toCharArray();
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UnicodeToBytes converter;
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// Work buffer of characters for converter.
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char[] work = new char[100];
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// Work buffer of bytes where we temporarily keep converter output.
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byte[] work_bytes = new byte[100];
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/**
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* This boolean indicates whether or not an error has ever occurred
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* on this stream.
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*/
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private boolean error_occurred = false;
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/**
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* This is <code>true</code> if auto-flush is enabled,
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* <code>false</code> otherwise
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*/
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private boolean auto_flush;
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/**
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* This method intializes a new <code>PrintStream</code> object to write
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* to the specified output sink.
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*
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* @param out The <code>OutputStream</code> to write to.
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*/
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public PrintStream (OutputStream out)
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{
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this (out, false);
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}
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/**
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* This method intializes a new <code>PrintStream</code> object to write
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* to the specified output sink. This constructor also allows "auto-flush"
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* functionality to be specified where the stream will be flushed after
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* every <code>print</code> or <code>println</code> call, when the
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* <code>write</code> methods with array arguments are called, or when a
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* single new-line character is written.
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* <p>
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*
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* @param out The <code>OutputStream</code> to write to.
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* @param auto_flush <code>true</code> to flush the stream after every
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* line, <code>false</code> otherwise
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*/
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public PrintStream (OutputStream out, boolean auto_flush)
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{
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super (out);
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converter = UnicodeToBytes.getDefaultEncoder();
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this.auto_flush = auto_flush;
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}
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/**
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* This method intializes a new <code>PrintStream</code> object to write
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* to the specified output sink. This constructor also allows "auto-flush"
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* functionality to be specified where the stream will be flushed after
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* every <code>print</code> or <code>println</code> call, when the
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* <code>write</code> methods with array arguments are called, or when a
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* single new-line character is written.
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* <p>
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*
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* @param out The <code>OutputStream</code> to write to.
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* @param auto_flush <code>true</code> to flush the stream after every
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* line, <code>false</code> otherwise
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* @param encoding The name of the character encoding to use for this
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* object.
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*/
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public PrintStream (OutputStream out, boolean auto_flush, String encoding)
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throws UnsupportedEncodingException
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{
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super (out);
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converter = UnicodeToBytes.getEncoder (encoding);
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this.auto_flush = auto_flush;
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}
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/**
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* This method checks to see if an error has occurred on this stream. Note
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* that once an error has occurred, this method will continue to report
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* <code>true</code> forever for this stream. Before checking for an
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* error condition, this method flushes the stream.
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*
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* @return <code>true</code> if an error has occurred,
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* <code>false</code> otherwise
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*/
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public boolean checkError ()
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{
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flush ();
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return error_occurred;
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}
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/**
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* This method can be called by subclasses to indicate that an error
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* has occurred and should be reported by <code>checkError</code>.
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*/
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protected void setError ()
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{
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error_occurred = true;
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}
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/**
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* This method closes this stream and all underlying streams.
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*/
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public void close ()
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{
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try
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{
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flush();
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out.close();
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}
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catch (InterruptedIOException iioe)
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{
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Thread.currentThread().interrupt();
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}
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catch (IOException e)
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{
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setError ();
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}
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}
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/**
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* This method flushes any buffered bytes to the underlying stream and
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* then flushes that stream as well.
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*/
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public void flush ()
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{
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try
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{
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out.flush();
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}
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catch (InterruptedIOException iioe)
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{
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Thread.currentThread().interrupt();
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}
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catch (IOException e)
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{
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setError ();
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}
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}
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private synchronized void print (String str, boolean println)
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{
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try
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{
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writeChars(str, 0, str.length());
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if (println)
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writeChars(line_separator, 0, line_separator.length);
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if (auto_flush)
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flush();
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}
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catch (InterruptedIOException iioe)
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{
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Thread.currentThread().interrupt();
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}
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catch (IOException e)
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{
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setError ();
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}
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}
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private synchronized void print (char[] chars, int pos, int len,
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boolean println)
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{
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try
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{
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writeChars(chars, pos, len);
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if (println)
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writeChars(line_separator, 0, line_separator.length);
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if (auto_flush)
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flush();
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}
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catch (InterruptedIOException iioe)
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{
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Thread.currentThread().interrupt();
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}
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catch (IOException e)
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{
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setError ();
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}
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}
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private void writeChars(char[] buf, int offset, int count)
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throws IOException
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{
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while (count > 0 || converter.havePendingBytes())
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{
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converter.setOutput(work_bytes, 0);
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int converted = converter.write(buf, offset, count);
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offset += converted;
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count -= converted;
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out.write(work_bytes, 0, converter.count);
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}
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}
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private void writeChars(String str, int offset, int count)
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throws IOException
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{
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while (count > 0 || converter.havePendingBytes())
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{
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converter.setOutput(work_bytes, 0);
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int converted = converter.write(str, offset, count, work);
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offset += converted;
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count -= converted;
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out.write(work_bytes, 0, converter.count);
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}
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}
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/**
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* This methods prints a boolean value to the stream. <code>true</code>
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* values are printed as "true" and <code>false</code> values are printed
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* as "false".
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*
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* @param bool The <code>boolean</code> value to print
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*/
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public void print (boolean bool)
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{
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print(String.valueOf(bool), false);
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}
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/**
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* This method prints an integer to the stream. The value printed is
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* determined using the <code>String.valueOf()</code> method.
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*
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* @param inum The <code>int</code> value to be printed
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*/
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public void print (int inum)
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{
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print(String.valueOf(inum), false);
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}
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/**
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* This method prints a long to the stream. The value printed is
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* determined using the <code>String.valueOf()</code> method.
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*
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* @param lnum The <code>long</code> value to be printed
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*/
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public void print (long lnum)
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{
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print(String.valueOf(lnum), false);
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}
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/**
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* This method prints a float to the stream. The value printed is
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* determined using the <code>String.valueOf()</code> method.
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*
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* @param fnum The <code>float</code> value to be printed
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*/
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public void print (float fnum)
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{
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print(String.valueOf(fnum), false);
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}
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/**
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* This method prints a double to the stream. The value printed is
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* determined using the <code>String.valueOf()</code> method.
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*
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* @param dnum The <code>double</code> value to be printed
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*/
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public void print (double dnum)
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{
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print(String.valueOf(dnum), false);
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}
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/**
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* This method prints an <code>Object</code> to the stream. The actual
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* value printed is determined by calling the <code>String.valueOf()</code>
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* method.
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*
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* @param obj The <code>Object</code> to print.
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*/
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public void print (Object obj)
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{
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print(obj == null ? "null" : obj.toString(), false);
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}
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/**
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* This method prints a <code>String</code> to the stream. The actual
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* value printed depends on the system default encoding.
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*
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* @param str The <code>String</code> to print.
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*/
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public void print (String str)
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{
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print(str == null ? "null" : str, false);
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}
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/**
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* This method prints a char to the stream. The actual value printed is
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* determined by the character encoding in use.
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*
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* @param ch The <code>char</code> value to be printed
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*/
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public synchronized void print (char ch)
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{
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work[0] = ch;
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print(work, 0, 1, false);
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}
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/**
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* This method prints an array of characters to the stream. The actual
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* value printed depends on the system default encoding.
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*
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* @param charArray The array of characters to print.
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*/
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public void print (char[] charArray)
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{
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print(charArray, 0, charArray.length, false);
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}
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/**
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* This method prints a line separator sequence to the stream. The value
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* printed is determined by the system property <xmp>line.separator</xmp>
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* and is not necessarily the Unix '\n' newline character.
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*/
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public void println ()
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{
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print(line_separator, 0, line_separator.length, false);
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}
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/**
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* This methods prints a boolean value to the stream. <code>true</code>
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* values are printed as "true" and <code>false</code> values are printed
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* as "false".
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* <p>
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* This method prints a line termination sequence after printing the value.
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*
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* @param bool The <code>boolean</code> value to print
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*/
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public void println (boolean bool)
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{
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print(String.valueOf(bool), true);
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}
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/**
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* This method prints an integer to the stream. The value printed is
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* determined using the <code>String.valueOf()</code> method.
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* <p>
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* This method prints a line termination sequence after printing the value.
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*
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* @param inum The <code>int</code> value to be printed
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*/
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public void println (int inum)
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{
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print(String.valueOf(inum), true);
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}
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/**
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* This method prints a long to the stream. The value printed is
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* determined using the <code>String.valueOf()</code> method.
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* <p>
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* This method prints a line termination sequence after printing the value.
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*
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* @param lnum The <code>long</code> value to be printed
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*/
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public void println (long lnum)
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{
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print(String.valueOf(lnum), true);
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}
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/**
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* This method prints a float to the stream. The value printed is
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* determined using the <code>String.valueOf()</code> method.
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* <p>
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* This method prints a line termination sequence after printing the value.
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*
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* @param fnum The <code>float</code> value to be printed
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*/
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public void println (float fnum)
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{
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print(String.valueOf(fnum), true);
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}
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/**
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* This method prints a double to the stream. The value printed is
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* determined using the <code>String.valueOf()</code> method.
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* <p>
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* This method prints a line termination sequence after printing the value.
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*
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* @param dnum The <code>double</code> value to be printed
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*/
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public void println (double dnum)
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{
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print(String.valueOf(dnum), true);
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}
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/**
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* This method prints an <code>Object</code> to the stream. The actual
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* value printed is determined by calling the <code>String.valueOf()</code>
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* method.
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* <p>
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* This method prints a line termination sequence after printing the value.
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*
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* @param obj The <code>Object</code> to print.
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*/
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public void println (Object obj)
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{
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print(obj == null ? "null" : obj.toString(), true);
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}
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/**
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* This method prints a <code>String</code> to the stream. The actual
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* value printed depends on the system default encoding.
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* <p>
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* This method prints a line termination sequence after printing the value.
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*
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* @param str The <code>String</code> to print.
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*/
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public void println (String str)
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{
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print (str == null ? "null" : str, true);
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}
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/**
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* This method prints a char to the stream. The actual value printed is
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* determined by the character encoding in use.
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* <p>
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* This method prints a line termination sequence after printing the value.
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*
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* @param ch The <code>char</code> value to be printed
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*/
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public synchronized void println (char ch)
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{
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work[0] = ch;
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print(work, 0, 1, true);
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}
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/**
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* This method prints an array of characters to the stream. The actual
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* value printed depends on the system default encoding.
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* <p>
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* This method prints a line termination sequence after printing the value.
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*
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* @param charArray The array of characters to print.
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*/
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public void println (char[] charArray)
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{
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print(charArray, 0, charArray.length, true);
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}
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/**
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* This method writes a byte of data to the stream. If auto-flush is
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* enabled, printing a newline character will cause the stream to be
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* flushed after the character is written.
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*
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* @param oneByte The byte to be written
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*/
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public void write (int oneByte)
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{
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try
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{
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out.write (oneByte & 0xff);
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if (auto_flush && (oneByte == '\n'))
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flush ();
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}
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catch (InterruptedIOException iioe)
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{
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Thread.currentThread ().interrupt ();
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}
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catch (IOException e)
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{
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setError ();
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}
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}
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/**
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* This method writes <code>len</code> bytes from the specified array
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* starting at index <code>offset</code> into the array.
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*
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* @param buffer The array of bytes to write
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* @param offset The index into the array to start writing from
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* @param len The number of bytes to write
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*/
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public void write (byte[] buffer, int offset, int len)
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{
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try
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{
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out.write (buffer, offset, len);
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if (auto_flush)
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flush ();
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}
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catch (InterruptedIOException iioe)
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{
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Thread.currentThread ().interrupt ();
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}
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catch (IOException e)
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{
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setError ();
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}
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}
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} // class PrintStream
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