org.apache.jasper.runtime

Class JspWriterImpl

java.lang.Object

java.io.Writer

javax.servlet.jsp.JspWriter

org.apache.jasper.runtime.JspWriterImpl

All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable

public class JspWriterImpl
extends JspWriter

Write text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings. Provide support for discarding for the output that has been buffered. This needs revisiting when the buffering problems in the JSP spec are fixed -akv

Author:

Anil K. Vijendran

Field Summary

Fields inherited from class javax.servlet.jsp.JspWriter

autoFlush, bufferSize, DEFAULT_BUFFER, NO_BUFFER, UNBOUNDED_BUFFER

Fields inherited from class java.io.Writer

lock

Constructor Summary

Constructors

Constructor and Description
JspWriterImpl()
JspWriterImpl(ServletResponse response, int sz, boolean autoFlush) Create a new buffered character-output stream that uses an output buffer of the given size.

Method Summary

Modifier and Type	Method and Description
void	clear() Discard the output buffer.
void	clearBuffer() Clears the current contents of the buffer.
void	close() Close the stream.
void	flush() Flush the stream.
protected void	flushBuffer() Flush the output buffer to the underlying character stream, without flushing the stream itself.
int	getRemaining() This method returns the number of unused bytes in the buffer.
void	newLine() Write a line separator.
void	print(boolean b) Print a boolean value.
void	print(char c) Print a character.
void	print(char[] s) Print an array of characters.
void	print(double d) Print a double-precision floating-point number.
void	print(float f) Print a floating-point number.
void	print(int i) Print an integer.
void	print(long l) Print a long integer.
void	print(Object obj) Print an object.
void	print(String s) Print a string.
void	println() Terminate the current line by writing the line separator string.
void	println(boolean x) Print a boolean value and then terminate the line.
void	println(char x) Print a character and then terminate the line.
void	println(char[] x) Print an array of characters and then terminate the line.
void	println(double x) Print a double-precision floating-point number and then terminate the line.
void	println(float x) Print a floating-point number and then terminate the line.
void	println(int x) Print an integer and then terminate the line.
void	println(long x) Print a long integer and then terminate the line.
void	println(Object x) Print an Object and then terminate the line.
void	println(String x) Print a String and then terminate the line.
void	write(char[] buf) Write an array of characters.
void	write(char[] cbuf, int off, int len) Write a portion of an array of characters.
void	write(int c) Write a single character.
void	write(String s, int off, int len) Write a portion of a String.

Methods inherited from class javax.servlet.jsp.JspWriter

getBufferSize, isAutoFlush

Methods inherited from class java.io.Writer

append, append, append, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JspWriterImpl

public JspWriterImpl()

JspWriterImpl

public JspWriterImpl(ServletResponse response,
                     int sz,
                     boolean autoFlush)

Create a new buffered character-output stream that uses an output buffer of the given size.

Parameters:

response - A Servlet Response

sz - Output-buffer size, a positive integer

autoFlush - true to automatically flush on buffer full, false to throw an overflow exception in that case

Throws:

IllegalArgumentException - If sz is <= 0

Method Detail

flushBuffer

protected final void flushBuffer()
                          throws IOException

Flush the output buffer to the underlying character stream, without flushing the stream itself. This method is non-private only so that it may be invoked by PrintStream.

Throws:

IOException - Error writing buffered data

clear

public final void clear()
                 throws IOException

Discard the output buffer.

Specified by:

clear in class JspWriter

Throws:

IOException - If an I/O error occurs

clearBuffer

public void clearBuffer()
                 throws IOException

Description copied from class: javax.servlet.jsp.JspWriter

Clears the current contents of the buffer. Unlike clear(), this method will not throw an IOException if the buffer has already been flushed. It merely clears the current content of the buffer and returns.

Specified by:

clearBuffer in class JspWriter

Throws:

IOException - If an I/O error occurs

flush

public void flush()
           throws IOException

Flush the stream.

Specified by:

flush in interface Flushable

Specified by:

flush in class JspWriter

Throws:

IOException - If an I/O error occurs

close

public void close()
           throws IOException

Close the stream.

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in class JspWriter

Throws:

IOException - If an I/O error occurs

getRemaining

public int getRemaining()

Description copied from class: javax.servlet.jsp.JspWriter

This method returns the number of unused bytes in the buffer.

Specified by:

getRemaining in class JspWriter

Returns:

the number of bytes unused in the buffer

write

public void write(int c)
           throws IOException

Write a single character.

Overrides:

write in class Writer

Throws:

IOException

write

public void write(char[] cbuf,
                  int off,
                  int len)
           throws IOException

Write a portion of an array of characters.

Ordinarily this method stores characters from the given array into this stream's buffer, flushing the buffer to the underlying stream as needed. If the requested length is at least as large as the buffer, however, then this method will flush the buffer and write the characters directly to the underlying stream. Thus redundant DiscardableBufferedWriters will not copy data unnecessarily.

Specified by:

write in class Writer

Parameters:

cbuf - A character array

off - Offset from which to start reading characters

len - Number of characters to write

Throws:

IOException

write

public void write(char[] buf)
           throws IOException

Write an array of characters. This method cannot be inherited from the Writer class because it must suppress I/O exceptions.

Overrides:

write in class Writer

Throws:

IOException

write

public void write(String s,
                  int off,
                  int len)
           throws IOException

Write a portion of a String.

Overrides:

write in class Writer

Parameters:

s - String to be written

off - Offset from which to start reading characters

len - Number of characters to be written

Throws:

IOException

newLine

public void newLine()
             throws IOException

Write a line separator. The line separator string is defined by the system property line.separator, and is not necessarily a single newline ('\n') character.

Specified by:

newLine in class JspWriter

Throws:

IOException - If an I/O error occurs

print

public void print(boolean b)
           throws IOException

Print a boolean value. The string produced by 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 write(int) method.

Specified by:

print in class JspWriter

Parameters:

b - The boolean to be printed

Throws:

IOException - If an error occurred while writing

print

public void print(char c)
           throws IOException

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 write(int) method.

Specified by:

print in class JspWriter

Parameters:

c - The char to be printed

Throws:

IOException - If an error occurred while writing

print

public void print(int i)
           throws IOException

Print an integer. The string produced by 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 write(int) method.

Specified by:

print in class JspWriter

Parameters:

i - The int to be printed

Throws:

IOException - If an error occurred while writing

See Also:

Integer.toString(int)

print

public void print(long l)
           throws IOException

Print a long integer. The string produced by 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 write(int) method.

Specified by:

print in class JspWriter

Parameters:

l - The long to be printed

Throws:

IOException - If an error occurred while writing

See Also:

Long.toString(long)

print

public void print(float f)
           throws IOException

Print a floating-point number. The string produced by 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 write(int) method.

Specified by:

print in class JspWriter

Parameters:

f - The float to be printed

Throws:

IOException - If an error occurred while writing

See Also:

Float.toString(float)

print

public void print(double d)
           throws IOException

Print a double-precision floating-point number. The string produced by 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 write(int) method.

Specified by:

print in class JspWriter

Parameters:

d - The double to be printed

Throws:

IOException - If an error occurred while writing

See Also:

Double.toString(double)

print

public void print(char[] s)
           throws IOException

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 write(int) method.

Specified by:

print in class JspWriter

Parameters:

s - The array of chars to be printed

Throws:

NullPointerException - If s is null

IOException - If an error occurred while writing

print

public void print(String s)
           throws IOException

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 write(int) method.

Specified by:

print in class JspWriter

Parameters:

s - The String to be printed

Throws:

IOException - If an error occurred while writing

print

public void print(Object obj)
           throws IOException

Print an object. The string produced by the 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 write(int) method.

Specified by:

print in class JspWriter

Parameters:

obj - The Object to be printed

Throws:

IOException - If an error occurred while writing

See Also:

Object.toString()

println

public void println()
             throws IOException

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'). Need to change this from PrintWriter because the default println() writes to the sink directly instead of through the write method...

Specified by:

println in class JspWriter

Throws:

IOException - If an error occurred while writing

println

public void println(boolean x)
             throws IOException

Print a boolean value and then terminate the line. This method behaves as though it invokes print(boolean) and then println().

Specified by:

println in class JspWriter

Parameters:

x - the boolean to write

Throws:

IOException - If an error occurred while writing

println

public void println(char x)
             throws IOException

Print a character and then terminate the line. This method behaves as though it invokes print(char) and then println().

Specified by:

println in class JspWriter

Parameters:

x - the char to write

Throws:

IOException - If an error occurred while writing

println

public void println(int x)
             throws IOException

Print an integer and then terminate the line. This method behaves as though it invokes print(int) and then println().

Specified by:

println in class JspWriter

Parameters:

x - the int to write

Throws:

IOException - If an error occurred while writing

println

public void println(long x)
             throws IOException

Print a long integer and then terminate the line. This method behaves as though it invokes print(long) and then println().

Specified by:

println in class JspWriter

Parameters:

x - the long to write

Throws:

IOException - If an error occurred while writing

println

public void println(float x)
             throws IOException

Print a floating-point number and then terminate the line. This method behaves as though it invokes print(float) and then println().

Specified by:

println in class JspWriter

Parameters:

x - the float to write

Throws:

IOException - If an error occurred while writing

println

public void println(double x)
             throws IOException

Print a double-precision floating-point number and then terminate the line. This method behaves as though it invokes print(double) and then println().

Specified by:

println in class JspWriter

Parameters:

x - the double to write

Throws:

IOException - If an error occurred while writing

println

public void println(char[] x)
             throws IOException

Print an array of characters and then terminate the line. This method behaves as though it invokes print(char[]) and then println().

Specified by:

println in class JspWriter

Parameters:

x - the char[] to write

Throws:

IOException - If an error occurred while writing

println

public void println(String x)
             throws IOException

Print a String and then terminate the line. This method behaves as though it invokes print(String) and then println().

Specified by:

println in class JspWriter

Parameters:

x - the String to write

Throws:

IOException - If an error occurred while writing

println

public void println(Object x)
             throws IOException

Print an Object and then terminate the line. This method behaves as though it invokes print(Object) and then println().

Specified by:

println in class JspWriter

Parameters:

x - the Object to write

Throws:

IOException - If an error occurred while writing