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jlechner |
/* PrintWriter.java -- prints primitive values and objects to a stream as text
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Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation
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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, plus online
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* API docs for JDK 1.2 beta from http://www.javasoft.com.
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* Status: Believed complete and correct.
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* However, should use native methods for conversion.
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*/
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/**
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* This class prints Java primitive values and objects 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 whenever one of the <code>println</code> methods is
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* called. (Note that this differs from the <code>PrintStream</code>
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* class which also auto-flushes when it encounters a newline character
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* in the chars written).
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*
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* @author Per Bothner (bothner@cygnus.com)
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @date April 17, 1998.
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*/
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public class PrintWriter extends Writer
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{
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/**
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* <code>true</code> if auto-flush is enabled, <code>false</code> otherwise
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*/
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private boolean autoflush;
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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;
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/**
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* Indicates whether or not the stream has been closed.
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*/
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private boolean closed;
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/**
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* This is the underlying <code>Writer</code> we are sending output
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* to
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*/
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protected Writer out;
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/**
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* This method intializes a new <code>PrintWriter</code> object to write
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* to the specified output sink. The form of the constructor does not
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* enable auto-flush functionality.
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*
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* @param wr The <code>Writer</code> to write to.
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*/
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public PrintWriter(Writer wr)
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{
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super(wr.lock);
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this.out = wr;
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}
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/**
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* This method intializes a new <code>PrintWriter</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 line is terminated or newline character is written.
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*
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* @param wr The <code>Writer</code> to write to.
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* @param autoflush <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 PrintWriter(Writer wr, boolean autoflush)
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{
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super(wr.lock);
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this.out = wr;
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this.autoflush = autoflush;
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}
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/**
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* This method initializes a new <code>PrintWriter</code> object to write
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* to the specified <code>OutputStream</code>. Characters will be converted
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* to chars using the system default encoding. Auto-flush functionality
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* will not be enabled.
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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 PrintWriter(OutputStream out)
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{
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super();
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this.out = new OutputStreamWriter(out);
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this.lock = this.out;
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}
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/**
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* This method initializes a new <code>PrintWriter</code> object to write
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* to the specified <code>OutputStream</code>. Characters will be converted
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* to chars using the system default encoding. This form of the
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* constructor allows auto-flush functionality to be enabled if desired
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*
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* @param out The <code>OutputStream</code> to write to
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* @param autoflush <code>true</code> to flush the stream after every
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* <code>println</code> call, <code>false</code> otherwise.
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*/
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public PrintWriter(OutputStream out, boolean autoflush)
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{
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this(out);
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this.autoflush = autoflush;
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}
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/**
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* This initializes a new PrintWriter object to write to the specified
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* file. It creates a FileOutputStream object and wraps it in an
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* OutputStreamWriter using the default encoding.
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* @param file name of the file to write to
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* @throws FileNotFoundException if the file cannot be written or created
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*
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* @since 1.5
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*/
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public PrintWriter(String file) throws FileNotFoundException
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{
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this(new FileOutputStream(file));
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}
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/**
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* This initializes a new PrintWriter object to write to the specified
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* file. It creates a FileOutputStream object and wraps it in an
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* OutputStreamWriter using the specified encoding.
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* @param file name of the file to write to
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* @param enc the encoding to use
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* @throws FileNotFoundException if the file cannot be written or created
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* @throws UnsupportedEncodingException if the encoding is not supported
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*
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* @since 1.5
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*/
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public PrintWriter(String file, String enc)
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throws FileNotFoundException, UnsupportedEncodingException
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{
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this(new OutputStreamWriter(new FileOutputStream(file), enc));
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}
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/**
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* This initializes a new PrintWriter object to write to the specified
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* file. It creates a FileOutputStream object and wraps it in an
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* OutputStreamWriter using the default encoding.
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* @param file the file to write to
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* @throws FileNotFoundException if the file cannot be written or created
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*
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* @since 1.5
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*/
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public PrintWriter(File file) throws FileNotFoundException
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{
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this(new FileOutputStream(file));
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}
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/**
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* This initializes a new PrintWriter object to write to the specified
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* file. It creates a FileOutputStream object and wraps it in an
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* OutputStreamWriter using the specified encoding.
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* @param file the file to write to
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* @param enc the encoding to use
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* @throws FileNotFoundException if the file cannot be written or created
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* @throws UnsupportedEncodingException if the encoding is not supported
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*
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* @since 1.5
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*/
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public PrintWriter(File file, String enc)
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throws FileNotFoundException, UnsupportedEncodingException
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{
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this(new OutputStreamWriter(new FileOutputStream(file), enc));
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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 = true;
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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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if (! closed)
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flush();
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return error;
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}
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/**
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* This method flushes any buffered chars 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 (IOException ex)
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{
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error = true;
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}
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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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out.close();
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closed = true;
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}
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catch (IOException ex)
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{
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error = true;
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}
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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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write(str == null ? "null" : str);
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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 void print(char ch)
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{
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write((int) ch);
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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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write(charArray, 0, charArray.length);
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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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// We purposely call write() and not print() here. This preserves
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// compatibility with JDK 1.2.
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write (bool ? "true" : "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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*
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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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// We purposely call write() and not print() here. This preserves
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// compatibility with JDK 1.2.
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write(Integer.toString(inum));
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}
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325 |
|
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/**
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* This method prints a long to the stream. The value printed is
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|
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* determined using the <code>String.valueOf()</code> method.
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328 |
|
|
*
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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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// We purposely call write() and not print() here. This preserves
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|
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// compatibility with JDK 1.2.
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write(Long.toString(lnum));
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|
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}
|
337 |
|
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|
338 |
|
|
/**
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339 |
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* This method prints a float to the stream. The value printed is
|
340 |
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* determined using the <code>String.valueOf()</code> method.
|
341 |
|
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*
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342 |
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* @param fnum The <code>float</code> value to be printed
|
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*/
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344 |
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public void print(float fnum)
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{
|
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// We purposely call write() and not print() here. This preserves
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// compatibility with JDK 1.2.
|
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write(Float.toString(fnum));
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}
|
350 |
|
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|
351 |
|
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/**
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352 |
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* This method prints a double to the stream. The value printed is
|
353 |
|
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* determined using the <code>String.valueOf()</code> method.
|
354 |
|
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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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*/
|
357 |
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public void print(double dnum)
|
358 |
|
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{
|
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|
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// We purposely call write() and not print() here. This preserves
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|
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// compatibility with JDK 1.2.
|
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|
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write(Double.toString(dnum));
|
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|
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}
|
363 |
|
|
|
364 |
|
|
/**
|
365 |
|
|
* This method prints an <code>Object</code> to the stream. The actual
|
366 |
|
|
* value printed is determined by calling the <code>String.valueOf()</code>
|
367 |
|
|
* method.
|
368 |
|
|
*
|
369 |
|
|
* @param obj The <code>Object</code> to print.
|
370 |
|
|
*/
|
371 |
|
|
public void print(Object obj)
|
372 |
|
|
{
|
373 |
|
|
// We purposely call write() and not print() here. This preserves
|
374 |
|
|
// compatibility with JDK 1.2.
|
375 |
|
|
write(obj == null ? "null" : obj.toString());
|
376 |
|
|
}
|
377 |
|
|
|
378 |
|
|
/**
|
379 |
|
|
* This is the system dependent line separator
|
380 |
|
|
*/
|
381 |
|
|
private static final char[] line_separator
|
382 |
|
|
= System.getProperty("line.separator", "\n").toCharArray();
|
383 |
|
|
|
384 |
|
|
/**
|
385 |
|
|
* This method prints a line separator sequence to the stream. The value
|
386 |
|
|
* printed is determined by the system property <xmp>line.separator</xmp>
|
387 |
|
|
* and is not necessarily the Unix '\n' newline character.
|
388 |
|
|
*/
|
389 |
|
|
public void println()
|
390 |
|
|
{
|
391 |
|
|
synchronized (lock)
|
392 |
|
|
{
|
393 |
|
|
try
|
394 |
|
|
{
|
395 |
|
|
write(line_separator, 0, line_separator.length);
|
396 |
|
|
if (autoflush)
|
397 |
|
|
out.flush();
|
398 |
|
|
}
|
399 |
|
|
catch (IOException ex)
|
400 |
|
|
{
|
401 |
|
|
error = true;
|
402 |
|
|
}
|
403 |
|
|
}
|
404 |
|
|
}
|
405 |
|
|
|
406 |
|
|
/**
|
407 |
|
|
* This methods prints a boolean value to the stream. <code>true</code>
|
408 |
|
|
* values are printed as "true" and <code>false</code> values are printed
|
409 |
|
|
* as "false".
|
410 |
|
|
*
|
411 |
|
|
* This method prints a line termination sequence after printing the value.
|
412 |
|
|
*
|
413 |
|
|
* @param bool The <code>boolean</code> value to print
|
414 |
|
|
*/
|
415 |
|
|
public void println(boolean bool)
|
416 |
|
|
{
|
417 |
|
|
synchronized (lock)
|
418 |
|
|
{
|
419 |
|
|
print(bool);
|
420 |
|
|
println();
|
421 |
|
|
}
|
422 |
|
|
}
|
423 |
|
|
|
424 |
|
|
/**
|
425 |
|
|
* This method prints an integer to the stream. The value printed is
|
426 |
|
|
* determined using the <code>String.valueOf()</code> method.
|
427 |
|
|
*
|
428 |
|
|
* This method prints a line termination sequence after printing the value.
|
429 |
|
|
*
|
430 |
|
|
* @param inum The <code>int</code> value to be printed
|
431 |
|
|
*/
|
432 |
|
|
public void println(int inum)
|
433 |
|
|
{
|
434 |
|
|
synchronized (lock)
|
435 |
|
|
{
|
436 |
|
|
print(inum);
|
437 |
|
|
println();
|
438 |
|
|
}
|
439 |
|
|
}
|
440 |
|
|
|
441 |
|
|
/**
|
442 |
|
|
* This method prints a long to the stream. The value printed is
|
443 |
|
|
* determined using the <code>String.valueOf()</code> method.
|
444 |
|
|
*
|
445 |
|
|
* This method prints a line termination sequence after printing the value.
|
446 |
|
|
*
|
447 |
|
|
* @param lnum The <code>long</code> value to be printed
|
448 |
|
|
*/
|
449 |
|
|
public void println(long lnum)
|
450 |
|
|
{
|
451 |
|
|
synchronized (lock)
|
452 |
|
|
{
|
453 |
|
|
print(lnum);
|
454 |
|
|
println();
|
455 |
|
|
}
|
456 |
|
|
}
|
457 |
|
|
|
458 |
|
|
/**
|
459 |
|
|
* This method prints a float to the stream. The value printed is
|
460 |
|
|
* determined using the <code>String.valueOf()</code> method.
|
461 |
|
|
*
|
462 |
|
|
* This method prints a line termination sequence after printing the value.
|
463 |
|
|
*
|
464 |
|
|
* @param fnum The <code>float</code> value to be printed
|
465 |
|
|
*/
|
466 |
|
|
public void println(float fnum)
|
467 |
|
|
{
|
468 |
|
|
synchronized (lock)
|
469 |
|
|
{
|
470 |
|
|
print(fnum);
|
471 |
|
|
println();
|
472 |
|
|
}
|
473 |
|
|
}
|
474 |
|
|
|
475 |
|
|
/**
|
476 |
|
|
* This method prints a double to the stream. The value printed is
|
477 |
|
|
* determined using the <code>String.valueOf()</code> method.
|
478 |
|
|
*
|
479 |
|
|
* This method prints a line termination sequence after printing the value.
|
480 |
|
|
*
|
481 |
|
|
* @param dnum The <code>double</code> value to be printed
|
482 |
|
|
*/
|
483 |
|
|
public void println(double dnum)
|
484 |
|
|
{
|
485 |
|
|
synchronized (lock)
|
486 |
|
|
{
|
487 |
|
|
print(dnum);
|
488 |
|
|
println();
|
489 |
|
|
}
|
490 |
|
|
}
|
491 |
|
|
|
492 |
|
|
/**
|
493 |
|
|
* This method prints an <code>Object</code> to the stream. The actual
|
494 |
|
|
* value printed is determined by calling the <code>String.valueOf()</code>
|
495 |
|
|
* method.
|
496 |
|
|
*
|
497 |
|
|
* This method prints a line termination sequence after printing the value.
|
498 |
|
|
*
|
499 |
|
|
* @param obj The <code>Object</code> to print.
|
500 |
|
|
*/
|
501 |
|
|
public void println(Object obj)
|
502 |
|
|
{
|
503 |
|
|
synchronized (lock)
|
504 |
|
|
{
|
505 |
|
|
print(obj);
|
506 |
|
|
println();
|
507 |
|
|
}
|
508 |
|
|
}
|
509 |
|
|
|
510 |
|
|
/**
|
511 |
|
|
* This method prints a <code>String</code> to the stream. The actual
|
512 |
|
|
* value printed depends on the system default encoding.
|
513 |
|
|
*
|
514 |
|
|
* This method prints a line termination sequence after printing the value.
|
515 |
|
|
*
|
516 |
|
|
* @param str The <code>String</code> to print.
|
517 |
|
|
*/
|
518 |
|
|
public void println(String str)
|
519 |
|
|
{
|
520 |
|
|
synchronized (lock)
|
521 |
|
|
{
|
522 |
|
|
print(str);
|
523 |
|
|
println();
|
524 |
|
|
}
|
525 |
|
|
}
|
526 |
|
|
|
527 |
|
|
/**
|
528 |
|
|
* This method prints a char to the stream. The actual value printed is
|
529 |
|
|
* determined by the character encoding in use.
|
530 |
|
|
*
|
531 |
|
|
* This method prints a line termination sequence after printing the value.
|
532 |
|
|
*
|
533 |
|
|
* @param ch The <code>char</code> value to be printed
|
534 |
|
|
*/
|
535 |
|
|
public void println(char ch)
|
536 |
|
|
{
|
537 |
|
|
synchronized (lock)
|
538 |
|
|
{
|
539 |
|
|
print(ch);
|
540 |
|
|
println();
|
541 |
|
|
}
|
542 |
|
|
}
|
543 |
|
|
|
544 |
|
|
/**
|
545 |
|
|
* This method prints an array of characters to the stream. The actual
|
546 |
|
|
* value printed depends on the system default encoding.
|
547 |
|
|
*
|
548 |
|
|
* This method prints a line termination sequence after printing the value.
|
549 |
|
|
*
|
550 |
|
|
* @param charArray The array of characters to print.
|
551 |
|
|
*/
|
552 |
|
|
public void println(char[] charArray)
|
553 |
|
|
{
|
554 |
|
|
synchronized (lock)
|
555 |
|
|
{
|
556 |
|
|
print(charArray);
|
557 |
|
|
println();
|
558 |
|
|
}
|
559 |
|
|
}
|
560 |
|
|
|
561 |
|
|
/**
|
562 |
|
|
* This method writes a single char to the stream.
|
563 |
|
|
*
|
564 |
|
|
* @param ch The char to be written, passed as a int
|
565 |
|
|
*/
|
566 |
|
|
public void write(int ch)
|
567 |
|
|
{
|
568 |
|
|
try
|
569 |
|
|
{
|
570 |
|
|
out.write(ch);
|
571 |
|
|
}
|
572 |
|
|
catch (IOException ex)
|
573 |
|
|
{
|
574 |
|
|
error = true;
|
575 |
|
|
}
|
576 |
|
|
}
|
577 |
|
|
|
578 |
|
|
/**
|
579 |
|
|
* This method writes <code>count</code> chars from the specified array
|
580 |
|
|
* starting at index <code>offset</code> into the array.
|
581 |
|
|
*
|
582 |
|
|
* @param charArray The array of chars to write
|
583 |
|
|
* @param offset The index into the array to start writing from
|
584 |
|
|
* @param count The number of chars to write
|
585 |
|
|
*/
|
586 |
|
|
public void write(char[] charArray, int offset, int count)
|
587 |
|
|
{
|
588 |
|
|
try
|
589 |
|
|
{
|
590 |
|
|
out.write(charArray, offset, count);
|
591 |
|
|
}
|
592 |
|
|
catch (IOException ex)
|
593 |
|
|
{
|
594 |
|
|
error = true;
|
595 |
|
|
}
|
596 |
|
|
}
|
597 |
|
|
|
598 |
|
|
/**
|
599 |
|
|
* This method writes <code>count</code> chars from the specified
|
600 |
|
|
* <code>String</code> to the output starting at character position
|
601 |
|
|
* <code>offset</code> into the <code>String</code>
|
602 |
|
|
*
|
603 |
|
|
* @param str The <code>String</code> to write chars from
|
604 |
|
|
* @param offset The offset into the <code>String</code> to start writing from
|
605 |
|
|
* @param count The number of chars to write.
|
606 |
|
|
*/
|
607 |
|
|
public void write(String str, int offset, int count)
|
608 |
|
|
{
|
609 |
|
|
try
|
610 |
|
|
{
|
611 |
|
|
out.write(str, offset, count);
|
612 |
|
|
}
|
613 |
|
|
catch (IOException ex)
|
614 |
|
|
{
|
615 |
|
|
error = true;
|
616 |
|
|
}
|
617 |
|
|
}
|
618 |
|
|
|
619 |
|
|
/**
|
620 |
|
|
* This method write all the chars in the specified array to the output.
|
621 |
|
|
*
|
622 |
|
|
* @param charArray The array of characters to write
|
623 |
|
|
*/
|
624 |
|
|
public void write(char[] charArray)
|
625 |
|
|
{
|
626 |
|
|
write(charArray, 0, charArray.length);
|
627 |
|
|
}
|
628 |
|
|
|
629 |
|
|
/**
|
630 |
|
|
* This method writes the contents of the specified <code>String</code>
|
631 |
|
|
* to the underlying stream.
|
632 |
|
|
*
|
633 |
|
|
* @param str The <code>String</code> to write
|
634 |
|
|
*/
|
635 |
|
|
public void write(String str)
|
636 |
|
|
{
|
637 |
|
|
write(str, 0, str.length());
|
638 |
|
|
}
|
639 |
|
|
}
|
640 |
|
|
|