org.eclipse.jetty.server.ResponseWriter Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jetty-server Show documentation
Show all versions of jetty-server Show documentation
The core jetty server artifact.
//
// ========================================================================
// Copyright (c) 1995-2017 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
* An instance of ResponseWriter is the {@link PrintWriter} subclass returned by {@link Response#getWriter()}.
* It differs from the standard {@link PrintWriter} in that:
* - It does not support autoflush
* - The default Locale for {@link #format(String, Object...)} is the locale obtained by {@link ServletResponse#getLocale()}
* - If a write or print method is called while {@link #checkError()} returns true, then a {@link RuntimeIOException} is thrown to stop needless iterations.
* - The writer may be reopen to allow for recycling
*
*
*/
public class ResponseWriter extends PrintWriter
{
private static final Logger LOG = Log.getLogger(ResponseWriter.class);
private final static String __lineSeparator = System.getProperty("line.separator");
private final static String __trueln = "true"+__lineSeparator;
private final static 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 new RuntimeIOException(_ioException);
if (_isClosed)
throw new EofException("Stream closed");
}
@Override
public void flush()
{
try
{
synchronized (lock)
{
isOpen();
out.flush();
}
}
catch (IOException 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 l, String format, Object... args)
{
try
{
synchronized (lock)
{
isOpen();
if ((_formatter == null) || (_formatter.locale() != l))
_formatter = new Formatter(this, l);
_formatter.format(l, format, args);
}
}
catch (InterruptedIOException ex)
{
LOG.debug(ex);
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
return this;
}
}