/
ResponseWriter.java
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/
ResponseWriter.java
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//
// ========================================================================
// Copyright (c) 1995-2019 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.server;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.io.PrintWriter;
import java.util.Formatter;
import java.util.Locale;
import javax.servlet.ServletResponse;
import org.eclipse.jetty.io.EofException;
import org.eclipse.jetty.io.RuntimeIOException;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/**
* Specialized PrintWriter for servlet Responses
* <p>An instance of ResponseWriter is the {@link PrintWriter} subclass returned by {@link Response#getWriter()}.
* It differs from the standard {@link PrintWriter} in that:<ul>
* <li>It does not support autoflush</li>
* <li>The default Locale for {@link #format(String, Object...)} is the locale obtained by {@link ServletResponse#getLocale()}</li>
* <li>If a write or print method is called while {@link #checkError()} returns true, then a {@link RuntimeIOException} is thrown to stop needless iterations.</li>
* <li>The writer may be reopen to allow for recycling</li>
* </ul>
*/
public class ResponseWriter extends PrintWriter
{
private static final Logger LOG = Log.getLogger(ResponseWriter.class);
private static final String __lineSeparator = System.getProperty("line.separator");
private static final String __trueln = "true" + __lineSeparator;
private static final String __falseln = "false" + __lineSeparator;
private final HttpWriter _httpWriter;
private final Locale _locale;
private final String _encoding;
private IOException _ioException;
private boolean _isClosed = false;
private Formatter _formatter;
public ResponseWriter(HttpWriter httpWriter, Locale locale, String encoding)
{
super(httpWriter, false);
_httpWriter = httpWriter;
_locale = locale;
_encoding = encoding;
}
public boolean isFor(Locale locale, String encoding)
{
if (_locale == null && locale != null)
return false;
if (_encoding == null && encoding != null)
return false;
return _encoding.equalsIgnoreCase(encoding) && _locale.equals(locale);
}
protected void reopen()
{
synchronized (lock)
{
_isClosed = false;
clearError();
out = _httpWriter;
}
}
@Override
protected void clearError()
{
synchronized (lock)
{
_ioException = null;
super.clearError();
}
}
@Override
public boolean checkError()
{
synchronized (lock)
{
return _ioException != null || super.checkError();
}
}
private void setError(Throwable th)
{
super.setError();
if (th instanceof IOException)
_ioException = (IOException)th;
else
{
_ioException = new IOException(String.valueOf(th));
_ioException.initCause(th);
}
if (LOG.isDebugEnabled())
LOG.debug(th);
}
@Override
protected void setError()
{
setError(new IOException());
}
/**
* Check to make sure that the stream has not been closed
*/
private void isOpen() throws IOException
{
if (_ioException != null)
throw _ioException;
if (_isClosed)
{
_ioException = new EofException("Stream closed");
throw _ioException;
}
}
@Override
public void flush()
{
try
{
synchronized (lock)
{
isOpen();
out.flush();
}
}
catch (Throwable ex)
{
setError(ex);
}
}
@Override
public void close()
{
try
{
synchronized (lock)
{
out.close();
_isClosed = true;
}
}
catch (IOException ex)
{
setError(ex);
}
}
@Override
public void write(int c)
{
try
{
synchronized (lock)
{
isOpen();
out.write(c);
}
}
catch (InterruptedIOException ex)
{
LOG.debug(ex);
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
}
@Override
public void write(char[] buf, int off, int len)
{
try
{
synchronized (lock)
{
isOpen();
out.write(buf, off, len);
}
}
catch (InterruptedIOException ex)
{
LOG.debug(ex);
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
}
@Override
public void write(char[] buf)
{
this.write(buf, 0, buf.length);
}
@Override
public void write(String s, int off, int len)
{
try
{
synchronized (lock)
{
isOpen();
out.write(s, off, len);
}
}
catch (InterruptedIOException ex)
{
LOG.debug(ex);
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
}
@Override
public void write(String s)
{
this.write(s, 0, s.length());
}
@Override
public void print(boolean b)
{
this.write(b ? "true" : "false");
}
@Override
public void print(char c)
{
this.write(c);
}
@Override
public void print(int i)
{
this.write(String.valueOf(i));
}
@Override
public void print(long l)
{
this.write(String.valueOf(l));
}
@Override
public void print(float f)
{
this.write(String.valueOf(f));
}
@Override
public void print(double d)
{
this.write(String.valueOf(d));
}
@Override
public void print(char[] s)
{
this.write(s);
}
@Override
public void print(String s)
{
if (s == null)
s = "null";
this.write(s);
}
@Override
public void print(Object obj)
{
this.write(String.valueOf(obj));
}
@Override
public void println()
{
try
{
synchronized (lock)
{
isOpen();
out.write(__lineSeparator);
}
}
catch (InterruptedIOException ex)
{
LOG.debug(ex);
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
}
@Override
public void println(boolean b)
{
println(b ? __trueln : __falseln);
}
@Override
public void println(char c)
{
try
{
synchronized (lock)
{
isOpen();
out.write(c);
}
}
catch (InterruptedIOException ex)
{
LOG.debug(ex);
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
}
@Override
public void println(int x)
{
this.println(String.valueOf(x));
}
@Override
public void println(long x)
{
this.println(String.valueOf(x));
}
@Override
public void println(float x)
{
this.println(String.valueOf(x));
}
@Override
public void println(double x)
{
this.println(String.valueOf(x));
}
@Override
public void println(char[] s)
{
try
{
synchronized (lock)
{
isOpen();
out.write(s, 0, s.length);
out.write(__lineSeparator);
}
}
catch (InterruptedIOException ex)
{
LOG.debug(ex);
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
}
@Override
public void println(String s)
{
if (s == null)
s = "null";
try
{
synchronized (lock)
{
isOpen();
out.write(s, 0, s.length());
out.write(__lineSeparator);
}
}
catch (InterruptedIOException ex)
{
LOG.debug(ex);
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
}
@Override
public void println(Object x)
{
this.println(String.valueOf(x));
}
@Override
public PrintWriter printf(String format, Object... args)
{
return format(_locale, format, args);
}
@Override
public PrintWriter printf(Locale l, String format, Object... args)
{
return format(l, format, args);
}
@Override
public PrintWriter format(String format, Object... args)
{
return format(_locale, format, args);
}
@Override
public PrintWriter format(Locale locale, String format, Object... args)
{
try
{
/* If the passed locale is null then
use any locale set on the response as the default. */
if (locale == null)
locale = _locale;
synchronized (lock)
{
isOpen();
if (_formatter == null)
{
_formatter = new Formatter(this, locale);
}
else if (!_formatter.locale().equals(locale))
{
_formatter = new Formatter(this, locale);
}
_formatter.format(locale, format, args);
}
}
catch (InterruptedIOException ex)
{
LOG.debug(ex);
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
return this;
}
}