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jlechner |
/* 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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/* 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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/**
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* Encoding name
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*/
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private String encoding;
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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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try {
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this.encoding = System.getProperty("file.encoding");
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} catch (SecurityException e){
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this.encoding = "ISO8859_1";
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} catch (IllegalArgumentException e){
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this.encoding = "ISO8859_1";
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} catch (NullPointerException e){
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this.encoding = "ISO8859_1";
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}
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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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new String(new byte[]{0}, encoding); // check if encoding is supported
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this.encoding = 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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byte[] bytes = (new String(buf, offset, count)).getBytes(encoding);
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out.write(bytes, 0, bytes.length);
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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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266 |
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byte[] bytes = str.substring(offset, offset+count).getBytes(encoding);
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out.write(bytes, 0, bytes.length);
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}
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269 |
|
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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".
|
274 |
|
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*
|
275 |
|
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* @param bool The <code>boolean</code> value to print
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276 |
|
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*/
|
277 |
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public void print (boolean bool)
|
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{
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279 |
|
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print(String.valueOf(bool), false);
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}
|
281 |
|
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|
282 |
|
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/**
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283 |
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* This method prints an integer to the stream. The value printed is
|
284 |
|
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* determined using the <code>String.valueOf()</code> method.
|
285 |
|
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*
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286 |
|
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* @param inum The <code>int</code> value to be printed
|
287 |
|
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*/
|
288 |
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public void print (int inum)
|
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|
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{
|
290 |
|
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print(String.valueOf(inum), false);
|
291 |
|
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}
|
292 |
|
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|
293 |
|
|
/**
|
294 |
|
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* This method prints a long to the stream. The value printed is
|
295 |
|
|
* determined using the <code>String.valueOf()</code> method.
|
296 |
|
|
*
|
297 |
|
|
* @param lnum The <code>long</code> value to be printed
|
298 |
|
|
*/
|
299 |
|
|
public void print (long lnum)
|
300 |
|
|
{
|
301 |
|
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print(String.valueOf(lnum), false);
|
302 |
|
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}
|
303 |
|
|
|
304 |
|
|
/**
|
305 |
|
|
* This method prints a float to the stream. The value printed is
|
306 |
|
|
* determined using the <code>String.valueOf()</code> method.
|
307 |
|
|
*
|
308 |
|
|
* @param fnum The <code>float</code> value to be printed
|
309 |
|
|
*/
|
310 |
|
|
public void print (float fnum)
|
311 |
|
|
{
|
312 |
|
|
print(String.valueOf(fnum), false);
|
313 |
|
|
}
|
314 |
|
|
|
315 |
|
|
/**
|
316 |
|
|
* This method prints a double to the stream. The value printed is
|
317 |
|
|
* determined using the <code>String.valueOf()</code> method.
|
318 |
|
|
*
|
319 |
|
|
* @param dnum The <code>double</code> value to be printed
|
320 |
|
|
*/
|
321 |
|
|
public void print (double dnum)
|
322 |
|
|
{
|
323 |
|
|
print(String.valueOf(dnum), false);
|
324 |
|
|
}
|
325 |
|
|
|
326 |
|
|
/**
|
327 |
|
|
* This method prints an <code>Object</code> to the stream. The actual
|
328 |
|
|
* value printed is determined by calling the <code>String.valueOf()</code>
|
329 |
|
|
* method.
|
330 |
|
|
*
|
331 |
|
|
* @param obj The <code>Object</code> to print.
|
332 |
|
|
*/
|
333 |
|
|
public void print (Object obj)
|
334 |
|
|
{
|
335 |
|
|
print(obj == null ? "null" : obj.toString(), false);
|
336 |
|
|
}
|
337 |
|
|
|
338 |
|
|
/**
|
339 |
|
|
* This method prints a <code>String</code> to the stream. The actual
|
340 |
|
|
* value printed depends on the system default encoding.
|
341 |
|
|
*
|
342 |
|
|
* @param str The <code>String</code> to print.
|
343 |
|
|
*/
|
344 |
|
|
public void print (String str)
|
345 |
|
|
{
|
346 |
|
|
print(str == null ? "null" : str, false);
|
347 |
|
|
}
|
348 |
|
|
|
349 |
|
|
/**
|
350 |
|
|
* This method prints a char to the stream. The actual value printed is
|
351 |
|
|
* determined by the character encoding in use.
|
352 |
|
|
*
|
353 |
|
|
* @param ch The <code>char</code> value to be printed
|
354 |
|
|
*/
|
355 |
|
|
public synchronized void print (char ch)
|
356 |
|
|
{
|
357 |
|
|
print(new char[]{ch}, 0, 1, false);
|
358 |
|
|
}
|
359 |
|
|
|
360 |
|
|
/**
|
361 |
|
|
* This method prints an array of characters to the stream. The actual
|
362 |
|
|
* value printed depends on the system default encoding.
|
363 |
|
|
*
|
364 |
|
|
* @param charArray The array of characters to print.
|
365 |
|
|
*/
|
366 |
|
|
public void print (char[] charArray)
|
367 |
|
|
{
|
368 |
|
|
print(charArray, 0, charArray.length, false);
|
369 |
|
|
}
|
370 |
|
|
|
371 |
|
|
/**
|
372 |
|
|
* This method prints a line separator sequence to the stream. The value
|
373 |
|
|
* printed is determined by the system property <xmp>line.separator</xmp>
|
374 |
|
|
* and is not necessarily the Unix '\n' newline character.
|
375 |
|
|
*/
|
376 |
|
|
public void println ()
|
377 |
|
|
{
|
378 |
|
|
print(line_separator, 0, line_separator.length, false);
|
379 |
|
|
}
|
380 |
|
|
|
381 |
|
|
/**
|
382 |
|
|
* This methods prints a boolean value to the stream. <code>true</code>
|
383 |
|
|
* values are printed as "true" and <code>false</code> values are printed
|
384 |
|
|
* as "false".
|
385 |
|
|
* <p>
|
386 |
|
|
* This method prints a line termination sequence after printing the value.
|
387 |
|
|
*
|
388 |
|
|
* @param bool The <code>boolean</code> value to print
|
389 |
|
|
*/
|
390 |
|
|
public void println (boolean bool)
|
391 |
|
|
{
|
392 |
|
|
print(String.valueOf(bool), true);
|
393 |
|
|
}
|
394 |
|
|
|
395 |
|
|
/**
|
396 |
|
|
* This method prints an integer to the stream. The value printed is
|
397 |
|
|
* determined using the <code>String.valueOf()</code> method.
|
398 |
|
|
* <p>
|
399 |
|
|
* This method prints a line termination sequence after printing the value.
|
400 |
|
|
*
|
401 |
|
|
* @param inum The <code>int</code> value to be printed
|
402 |
|
|
*/
|
403 |
|
|
public void println (int inum)
|
404 |
|
|
{
|
405 |
|
|
print(String.valueOf(inum), true);
|
406 |
|
|
}
|
407 |
|
|
|
408 |
|
|
/**
|
409 |
|
|
* This method prints a long to the stream. The value printed is
|
410 |
|
|
* determined using the <code>String.valueOf()</code> method.
|
411 |
|
|
* <p>
|
412 |
|
|
* This method prints a line termination sequence after printing the value.
|
413 |
|
|
*
|
414 |
|
|
* @param lnum The <code>long</code> value to be printed
|
415 |
|
|
*/
|
416 |
|
|
public void println (long lnum)
|
417 |
|
|
{
|
418 |
|
|
print(String.valueOf(lnum), true);
|
419 |
|
|
}
|
420 |
|
|
|
421 |
|
|
/**
|
422 |
|
|
* This method prints a float to the stream. The value printed is
|
423 |
|
|
* determined using the <code>String.valueOf()</code> method.
|
424 |
|
|
* <p>
|
425 |
|
|
* This method prints a line termination sequence after printing the value.
|
426 |
|
|
*
|
427 |
|
|
* @param fnum The <code>float</code> value to be printed
|
428 |
|
|
*/
|
429 |
|
|
public void println (float fnum)
|
430 |
|
|
{
|
431 |
|
|
print(String.valueOf(fnum), true);
|
432 |
|
|
}
|
433 |
|
|
|
434 |
|
|
/**
|
435 |
|
|
* This method prints a double to the stream. The value printed is
|
436 |
|
|
* determined using the <code>String.valueOf()</code> method.
|
437 |
|
|
* <p>
|
438 |
|
|
* This method prints a line termination sequence after printing the value.
|
439 |
|
|
*
|
440 |
|
|
* @param dnum The <code>double</code> value to be printed
|
441 |
|
|
*/
|
442 |
|
|
public void println (double dnum)
|
443 |
|
|
{
|
444 |
|
|
print(String.valueOf(dnum), true);
|
445 |
|
|
}
|
446 |
|
|
|
447 |
|
|
/**
|
448 |
|
|
* This method prints an <code>Object</code> to the stream. The actual
|
449 |
|
|
* value printed is determined by calling the <code>String.valueOf()</code>
|
450 |
|
|
* method.
|
451 |
|
|
* <p>
|
452 |
|
|
* This method prints a line termination sequence after printing the value.
|
453 |
|
|
*
|
454 |
|
|
* @param obj The <code>Object</code> to print.
|
455 |
|
|
*/
|
456 |
|
|
public void println (Object obj)
|
457 |
|
|
{
|
458 |
|
|
print(obj == null ? "null" : obj.toString(), true);
|
459 |
|
|
}
|
460 |
|
|
|
461 |
|
|
/**
|
462 |
|
|
* This method prints a <code>String</code> to the stream. The actual
|
463 |
|
|
* value printed depends on the system default encoding.
|
464 |
|
|
* <p>
|
465 |
|
|
* This method prints a line termination sequence after printing the value.
|
466 |
|
|
*
|
467 |
|
|
* @param str The <code>String</code> to print.
|
468 |
|
|
*/
|
469 |
|
|
public void println (String str)
|
470 |
|
|
{
|
471 |
|
|
print (str == null ? "null" : str, true);
|
472 |
|
|
}
|
473 |
|
|
|
474 |
|
|
/**
|
475 |
|
|
* This method prints a char to the stream. The actual value printed is
|
476 |
|
|
* determined by the character encoding in use.
|
477 |
|
|
* <p>
|
478 |
|
|
* This method prints a line termination sequence after printing the value.
|
479 |
|
|
*
|
480 |
|
|
* @param ch The <code>char</code> value to be printed
|
481 |
|
|
*/
|
482 |
|
|
public synchronized void println (char ch)
|
483 |
|
|
{
|
484 |
|
|
print(new char[]{ch}, 0, 1, true);
|
485 |
|
|
}
|
486 |
|
|
|
487 |
|
|
/**
|
488 |
|
|
* This method prints an array of characters to the stream. The actual
|
489 |
|
|
* value printed depends on the system default encoding.
|
490 |
|
|
* <p>
|
491 |
|
|
* This method prints a line termination sequence after printing the value.
|
492 |
|
|
*
|
493 |
|
|
* @param charArray The array of characters to print.
|
494 |
|
|
*/
|
495 |
|
|
public void println (char[] charArray)
|
496 |
|
|
{
|
497 |
|
|
print(charArray, 0, charArray.length, true);
|
498 |
|
|
}
|
499 |
|
|
|
500 |
|
|
/**
|
501 |
|
|
* This method writes a byte of data to the stream. If auto-flush is
|
502 |
|
|
* enabled, printing a newline character will cause the stream to be
|
503 |
|
|
* flushed after the character is written.
|
504 |
|
|
*
|
505 |
|
|
* @param oneByte The byte to be written
|
506 |
|
|
*/
|
507 |
|
|
public void write (int oneByte)
|
508 |
|
|
{
|
509 |
|
|
try
|
510 |
|
|
{
|
511 |
|
|
out.write (oneByte & 0xff);
|
512 |
|
|
|
513 |
|
|
if (auto_flush && (oneByte == '\n'))
|
514 |
|
|
flush ();
|
515 |
|
|
}
|
516 |
|
|
catch (InterruptedIOException iioe)
|
517 |
|
|
{
|
518 |
|
|
Thread.currentThread ().interrupt ();
|
519 |
|
|
}
|
520 |
|
|
catch (IOException e)
|
521 |
|
|
{
|
522 |
|
|
setError ();
|
523 |
|
|
}
|
524 |
|
|
}
|
525 |
|
|
|
526 |
|
|
/**
|
527 |
|
|
* This method writes <code>len</code> bytes from the specified array
|
528 |
|
|
* starting at index <code>offset</code> into the array.
|
529 |
|
|
*
|
530 |
|
|
* @param buffer The array of bytes to write
|
531 |
|
|
* @param offset The index into the array to start writing from
|
532 |
|
|
* @param len The number of bytes to write
|
533 |
|
|
*/
|
534 |
|
|
public void write (byte[] buffer, int offset, int len)
|
535 |
|
|
{
|
536 |
|
|
try
|
537 |
|
|
{
|
538 |
|
|
out.write (buffer, offset, len);
|
539 |
|
|
|
540 |
|
|
if (auto_flush)
|
541 |
|
|
flush ();
|
542 |
|
|
}
|
543 |
|
|
catch (InterruptedIOException iioe)
|
544 |
|
|
{
|
545 |
|
|
Thread.currentThread ().interrupt ();
|
546 |
|
|
}
|
547 |
|
|
catch (IOException e)
|
548 |
|
|
{
|
549 |
|
|
setError ();
|
550 |
|
|
}
|
551 |
|
|
}
|
552 |
|
|
} // class PrintStream
|
553 |
|
|
|