org.eclipse.jetty.io.UncheckedPrintWriter Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2016 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.io;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Writer;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/* ------------------------------------------------------------ */
/**
* A wrapper for the {@link java.io.PrintWriter} that re-throws the instances of
* {@link java.io.IOException} thrown by the underlying implementation of
* {@link java.io.Writer} as {@link RuntimeIOException} instances.
*/
public class UncheckedPrintWriter extends PrintWriter
{
private static final Logger LOG = Log.getLogger(UncheckedPrintWriter.class);
private boolean _autoFlush = false;
private IOException _ioException;
private boolean _isClosed = false;
/* ------------------------------------------------------------ */
/**
* Line separator string. This is the value of the line.separator property
* at the moment that the stream was created.
*/
private String _lineSeparator;
public UncheckedPrintWriter(Writer out)
{
this(out,false);
}
/* ------------------------------------------------------------ */
/**
* Create a new PrintWriter.
*
* @param out
* A character-output stream
* @param autoFlush
* A boolean; if true, the println() methods will flush the
* output buffer
*/
public UncheckedPrintWriter(Writer out, boolean autoFlush)
{
super(out,autoFlush);
this._autoFlush = autoFlush;
this._lineSeparator = System.getProperty("line.separator");
}
/* ------------------------------------------------------------ */
/**
* Create a new PrintWriter, without automatic line flushing, from an
* existing OutputStream. This convenience constructor creates the necessary
* intermediate OutputStreamWriter, which will convert characters into bytes
* using the default character encoding.
*
* @param out
* An output stream
*
* @see java.io.OutputStreamWriter#OutputStreamWriter(java.io.OutputStream)
*/
public UncheckedPrintWriter(OutputStream out)
{
this(out,false);
}
/* ------------------------------------------------------------ */
/**
* Create a new PrintWriter from an existing OutputStream. This convenience
* constructor creates the necessary intermediate OutputStreamWriter, which
* will convert characters into bytes using the default character encoding.
*
* @param out
* An output stream
* @param autoFlush
* A boolean; if true, the println() methods will flush the
* output buffer
*
* @see java.io.OutputStreamWriter#OutputStreamWriter(java.io.OutputStream)
*/
public UncheckedPrintWriter(OutputStream out, boolean autoFlush)
{
this(new BufferedWriter(new OutputStreamWriter(out)),autoFlush);
}
/* ------------------------------------------------------------ */
public boolean checkError()
{
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);
}
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 IOException("Stream closed");
}
/* ------------------------------------------------------------ */
/**
* Flush the stream.
*/
@Override
public void flush()
{
try
{
synchronized (lock)
{
isOpen();
out.flush();
}
}
catch (IOException ex)
{
setError(ex);
}
}
/* ------------------------------------------------------------ */
/**
* Close the stream.
*/
@Override
public void close()
{
try
{
synchronized (lock)
{
out.close();
_isClosed = true;
}
}
catch (IOException ex)
{
setError(ex);
}
}
/* ------------------------------------------------------------ */
/**
* Write a single character.
*
* @param c
* int specifying a character to be written.
*/
@Override
public void write(int c)
{
try
{
synchronized (lock)
{
isOpen();
out.write(c);
}
}
catch (InterruptedIOException x)
{
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
}
/* ------------------------------------------------------------ */
/**
* Write a portion of an array of characters.
*
* @param buf
* Array of characters
* @param off
* Offset from which to start writing characters
* @param len
* Number of characters to write
*/
@Override
public void write(char buf[], int off, int len)
{
try
{
synchronized (lock)
{
isOpen();
out.write(buf,off,len);
}
}
catch (InterruptedIOException x)
{
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
}
/* ------------------------------------------------------------ */
/**
* Write an array of characters. This method cannot be inherited from the
* Writer class because it must suppress I/O exceptions.
*
* @param buf
* Array of characters to be written
*/
@Override
public void write(char buf[])
{
this.write(buf,0,buf.length);
}
/* ------------------------------------------------------------ */
/**
* Write a portion of a string.
*
* @param s
* A String
* @param off
* Offset from which to start writing characters
* @param len
* Number of characters to write
*/
@Override
public void write(String s, int off, int len)
{
try
{
synchronized (lock)
{
isOpen();
out.write(s,off,len);
}
}
catch (InterruptedIOException x)
{
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
}
/* ------------------------------------------------------------ */
/**
* Write a string. This method cannot be inherited from the Writer class
* because it must suppress I/O exceptions.
*
* @param s
* String to be written
*/
@Override
public void write(String s)
{
this.write(s,0,s.length());
}
private void newLine()
{
try
{
synchronized (lock)
{
isOpen();
out.write(_lineSeparator);
if (_autoFlush)
out.flush();
}
}
catch (InterruptedIOException x)
{
Thread.currentThread().interrupt();
}
catch (IOException ex)
{
setError(ex);
}
}
/* ------------------------------------------------------------ */
/**
* Print a boolean value. The string produced by {@link
* java.lang.String#valueOf(boolean)} is translated into bytes
* according to the platform's default character encoding, and these bytes
* are written in exactly the manner of the {@link
* #write(int)} method.
*
* @param b
* The boolean to be printed
*/
@Override
public void print(boolean b)
{
this.write(b?"true":"false");
}
/* ------------------------------------------------------------ */
/**
* Print a character. The character is translated into one or more bytes
* according to the platform's default character encoding, and these bytes
* are written in exactly the manner of the {@link
* #write(int)} method.
*
* @param c
* The char to be printed
*/
@Override
public void print(char c)
{
this.write(c);
}
/* ------------------------------------------------------------ */
/**
* Print an integer. The string produced by {@link
* java.lang.String#valueOf(int)} is translated into bytes according
* to the platform's default character encoding, and these bytes are written
* in exactly the manner of the {@link #write(int)} method.
*
* @param i
* The int to be printed
* @see java.lang.Integer#toString(int)
*/
@Override
public void print(int i)
{
this.write(String.valueOf(i));
}
/* ------------------------------------------------------------ */
/**
* Print a long integer. The string produced by {@link
* java.lang.String#valueOf(long)} is translated into bytes according
* to the platform's default character encoding, and these bytes are written
* in exactly the manner of the {@link #write(int)} method.
*
* @param l
* The long to be printed
* @see java.lang.Long#toString(long)
*/
@Override
public void print(long l)
{
this.write(String.valueOf(l));
}
/* ------------------------------------------------------------ */
/**
* Print a floating-point number. The string produced by {@link
* java.lang.String#valueOf(float)} is translated into bytes
* according to the platform's default character encoding, and these bytes
* are written in exactly the manner of the {@link #write(int)}
* method.
*
* @param f
* The float to be printed
* @see java.lang.Float#toString(float)
*/
@Override
public void print(float f)
{
this.write(String.valueOf(f));
}
/* ------------------------------------------------------------ */
/**
* Print a double-precision floating-point number. The string produced by
* {@link java.lang.String#valueOf(double)} is translated into
* bytes according to the platform's default character encoding, and these
* bytes are written in exactly the manner of the {@link
* #write(int)} method.
*
* @param d
* The double to be printed
* @see java.lang.Double#toString(double)
*/
@Override
public void print(double d)
{
this.write(String.valueOf(d));
}
/* ------------------------------------------------------------ */
/**
* Print an array of characters. The characters are converted into bytes
* according to the platform's default character encoding, and these bytes
* are written in exactly the manner of the {@link #write(int)}
* method.
*
* @param s
* The array of chars to be printed
*
* @throws NullPointerException
* If s is null
*/
@Override
public void print(char s[])
{
this.write(s);
}
/* ------------------------------------------------------------ */
/**
* Print a string. If the argument is null then the string
* "null" is printed. Otherwise, the string's characters are
* converted into bytes according to the platform's default character
* encoding, and these bytes are written in exactly the manner of the
* {@link #write(int)} method.
*
* @param s
* The String to be printed
*/
@Override
public void print(String s)
{
if (s == null)
{
s = "null";
}
this.write(s);
}
/* ------------------------------------------------------------ */
/**
* Print an object. The string produced by the {@link
* java.lang.String#valueOf(Object)} method is translated into bytes
* according to the platform's default character encoding, and these bytes
* are written in exactly the manner of the {@link #write(int)}
* method.
*
* @param obj
* The Object to be printed
* @see java.lang.Object#toString()
*/
@Override
public void print(Object obj)
{
this.write(String.valueOf(obj));
}
/* ------------------------------------------------------------ */
/**
* Terminate the current line by writing the line separator string. The line
* separator string is defined by the system property
* line.separator, and is not necessarily a single newline
* character ('\n').
*/
@Override
public void println()
{
this.newLine();
}
/* ------------------------------------------------------------ */
/**
* Print a boolean value and then terminate the line. This method behaves as
* though it invokes {@link #print(boolean)} and then
* {@link #println()}.
*
* @param x
* the boolean value to be printed
*/
@Override
public void println(boolean x)
{
synchronized (lock)
{
this.print(x);
this.println();
}
}
/* ------------------------------------------------------------ */
/**
* Print a character and then terminate the line. This method behaves as
* though it invokes {@link #print(char)} and then {@link
* #println()}.
*
* @param x
* the char value to be printed
*/
@Override
public void println(char x)
{
synchronized (lock)
{
this.print(x);
this.println();
}
}
/* ------------------------------------------------------------ */
/**
* Print an integer and then terminate the line. This method behaves as
* though it invokes {@link #print(int)} and then {@link
* #println()}.
*
* @param x
* the int value to be printed
*/
@Override
public void println(int x)
{
synchronized (lock)
{
this.print(x);
this.println();
}
}
/* ------------------------------------------------------------ */
/**
* Print a long integer and then terminate the line. This method behaves as
* though it invokes {@link #print(long)} and then
* {@link #println()}.
*
* @param x
* the long value to be printed
*/
@Override
public void println(long x)
{
synchronized (lock)
{
this.print(x);
this.println();
}
}
/* ------------------------------------------------------------ */
/**
* Print a floating-point number and then terminate the line. This method
* behaves as though it invokes {@link #print(float)} and then
* {@link #println()}.
*
* @param x
* the float value to be printed
*/
@Override
public void println(float x)
{
synchronized (lock)
{
this.print(x);
this.println();
}
}
/* ------------------------------------------------------------ */
/**
* Print a double-precision floating-point number and then terminate the
* line. This method behaves as though it invokes {@link
* #print(double)} and then {@link #println()}.
*
* @param x
* the double value to be printed
*/
/* ------------------------------------------------------------ */
@Override
public void println(double x)
{
synchronized (lock)
{
this.print(x);
this.println();
}
}
/* ------------------------------------------------------------ */
/**
* Print an array of characters and then terminate the line. This method
* behaves as though it invokes {@link #print(char[])} and then
* {@link #println()}.
*
* @param x
* the array of char values to be printed
*/
@Override
public void println(char x[])
{
synchronized (lock)
{
this.print(x);
this.println();
}
}
/* ------------------------------------------------------------ */
/**
* Print a String and then terminate the line. This method behaves as though
* it invokes {@link #print(String)} and then
* {@link #println()}.
*
* @param x
* the String value to be printed
*/
@Override
public void println(String x)
{
synchronized (lock)
{
this.print(x);
this.println();
}
}
/* ------------------------------------------------------------ */
/**
* Print an Object and then terminate the line. This method behaves as
* though it invokes {@link #print(Object)} and then
* {@link #println()}.
*
* @param x
* the Object value to be printed
*/
@Override
public void println(Object x)
{
synchronized (lock)
{
this.print(x);
this.println();
}
}
}
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