/* OutputStreamWriter.java -- Writer that converts chars to bytes
Copyright (C) 1998, 1999, 2000, 2001, 2003, 2005 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module. An independent module is a module which is not derived from
or based on this library. If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this
exception statement from your version. */
package java.io;
public class OutputStreamWriter extends Writer {
/**
* The output stream.
*/
private OutputStream out;
/**
* java.io canonical name of the encoding.
*/
private String encodingName;
/**
* This method initializes a new instance of <code>OutputStreamWriter</code>
* to write to the specified stream using a caller supplied character
* encoding scheme. Note that due to a deficiency in the Java language
* design, there is no way to determine which encodings are supported.
*
* @param out
* The <code>OutputStream</code> to write to
* @param encoding_scheme
* The name of the encoding scheme to use for character to byte
* translation
*
* @exception UnsupportedEncodingException
* If the named encoding is not available.
*/
public OutputStreamWriter(OutputStream out, String encoding_name)
throws UnsupportedEncodingException {
if (!(encoding_name.equals("ASCII") || encoding_name.equals("ascii") || encoding_name
.equals("Ascii"))) {
throw new UnsupportedEncodingException(
"io.InputStreamReader: only ASCII encoding supported");
}
this.out = out;
}
/**
* This method initializes a new instance of <code>OutputStreamWriter</code>
* to write to the specified stream using the default encoding.
*
* @param out
* The <code>OutputStream</code> to write to
*/
public OutputStreamWriter(OutputStream out) {
this.out = out;
}
/**
* This method closes this stream, and the underlying
* <code>OutputStream</code>
*
* @exception IOException
* If an error occurs
*/
public void close() throws IOException {
if (out == null)
return;
flush();
out.close();
out = null;
}
/**
* This method returns the name of the character encoding scheme currently
* in use by this stream. If the stream has been closed, then this method
* may return <code>null</code>.
*
* @return The encoding scheme name
*/
public String getEncoding() {
return "ASCII";
}
/**
* This method flushes any buffered bytes to the underlying output sink.
*
* @exception IOException
* If an error occurs
*/
public void flush() throws IOException {
out.flush();
}
/**
* This method writes <code>count</code> characters from the specified
* array to the output stream starting at position <code>offset</code>
* into the array.
*
* @param buf
* The array of character to write from
* @param offset
* The offset into the array to start writing chars from
* @param count
* The number of chars to write.
*
* @exception IOException
* If an error occurs
*/
public void write(char[] buf, int offset, int count) throws IOException {
if (out == null)
throw new IOException("Stream is closed.");
byte[] b = new byte[count];
for (int i = 0; i < count; i++)
b[i] = (byte) ((buf[offset + i] <= 0xFF) ? buf[offset + i] : '?');
out.write(b);
}
/**
* This method writes <code>count</code> bytes from the specified
* <code>String</code> starting at position <code>offset</code> into the
* <code>String</code>.
*
* @param str
* The <code>String</code> to write chars from
* @param offset
* The position in the <code>String</code> to start writing
* chars from
* @param count
* The number of chars to write
*
* @exception IOException
* If an error occurs
*/
public void write(String str, int offset, int count) throws IOException {
if (str == null)
throw new IOException("String is null.");
write(str.toCharArray(), offset, count);
}
/**
* This method writes a single character to the output stream.
*
* @param ch
* The char to write, passed as an int.
*
* @exception IOException
* If an error occurs
*/
public void write(int ch) throws IOException {
write(new char[] { (char) ch }, 0, 1);
}
} // class OutputStreamWriter