/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program 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 version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package java.io;
import com.sun.cldc.i18n.*;
/**
* An OutputStreamWriter is a bridge from character streams to byte streams:
* Characters written to it are translated into bytes.
* The encoding that it uses may be specified by name, or the platform's default
* encoding may be accepted.
*
* <p> Each invocation of a write() method causes the encoding converter to be
* invoked on the given character(s). The resulting bytes are accumulated in a
* buffer before being written to the underlying output stream. The size of
* this buffer may be specified, but by default it is large enough for most
* purposes. Note that the characters passed to the write() methods are not
* buffered.
*
* @version 1.0, 12/15/99 (CLDC 1.0, Spring 2000)
*/
public class OutputStreamWriter extends Writer {
/**
* The underlying character output stream.
*/
private Writer out;
/**
* Create an OutputStreamWriter that uses the default character encoding.
*
* @param os An OutputStream
*/
public OutputStreamWriter(OutputStream os) {
out = Helper.getStreamWriter(os);
}
/**
* Create an OutputStreamWriter that uses the named character encoding.
*
* @param os An OutputStream
* @param enc The name of a supported
*
* @exception UnsupportedEncodingException
* If the named encoding is not supported
*/
public OutputStreamWriter(OutputStream os, String enc)
throws UnsupportedEncodingException
{
out = Helper.getStreamWriter(os, enc);
}
/** Check to make sure that the stream has not been closed */
private void ensureOpen() throws IOException {
if (out == null) {
throw new IOException(
/* #ifdef VERBOSE_EXCEPTIONS */
/// skipped "Stream closed"
/* #endif */
);
}
}
/**
* Write a single character.
*
* @exception IOException If an I/O error occurs
*/
public void write(int c) throws IOException {
ensureOpen();
out.write(c);
}
/**
* Write a portion of an array of characters.
*
* @param cbuf Buffer of characters to be written
* @param off Offset from which to start reading characters
* @param len Number of characters to be written
*
* @exception IOException If an I/O error occurs
*/
public void write(char cbuf[], int off, int len) throws IOException {
ensureOpen();
if ((off < 0) || (off > cbuf.length) || (len < 0) ||
((off + len) > cbuf.length) || ((off + len) < 0)) {
throw new IndexOutOfBoundsException();
} else if (len == 0) {
return;
}
out.write(cbuf, off, len);
}
/**
* Write a portion of a string.
*
* @param str String to be written
* @param off Offset from which to start reading characters
* @param len Number of characters to be written
*
* @exception IOException If an I/O error occurs
*/
public void write(String str, int off, int len) throws IOException {
ensureOpen();
if ((off < 0) || (off > str.length()) || (len < 0) ||
((off + len) > str.length()) || ((off + len) < 0)) {
throw new IndexOutOfBoundsException();
} else if (len == 0) {
return;
}
out.write(str, off, len);
}
/**
* Flush the stream.
*
* @exception IOException If an I/O error occurs
*/
public void flush() throws IOException {
ensureOpen();
out.flush();
}
/**
* Close the stream.
*
* @exception IOException If an I/O error occurs
*/
public void close() throws IOException {
if (out != null) {
out.close();
out = null;
}
}
}
|