JspWriterImpl (Jasper Internal API Documentation)

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## org.apache.jasper.runtime
Class JspWriterImpl

    java.lang.Object
      java.io.Writer
          javax.servlet.jsp.JspWriter
              org.apache.jasper.runtime.JspWriterImpl

public class JspWriterImpl
extends javax.servlet.jsp.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
`protected char[]` | `cb`
`protected boolean` | `closed`
`protected static int` | `defaultCharBufferSize`
`protected boolean` | `flushed`
`protected int` | `nextChar`
`protected java.io.Writer` | `out`
`protected javax.servlet.ServletResponse` | `response`

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
`JspWriterImpl()`
`JspWriterImpl(javax.servlet.ServletResponse response)` Create a buffered character-output stream that uses a default-sized output buffer.
`JspWriterImpl(javax.servlet.ServletResponse response, int sz, boolean autoFlush)` Create a new buffered character-output stream that uses an output buffer of the given size.

Method Summary
`void` | `clear()` Discard the output buffer.
`void` | `clearBuffer()`
`void` | `close()` Close the stream.
`protected void` | `ensureOpen()` check to make sure that the stream has not been closed
`void` | `flush()` Flush the stream.
`protected void` | `flushBuffer()` Flush the output buffer to the underlying character stream, without flushing the stream itself.
`int` | `getRemaining()`
`protected void` | `initOut()`
`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(java.lang.Object obj)` Print an object.
`void` | `print(java.lang.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(java.lang.Object x)` Print an Object and then terminate the line.
`void` | `println(java.lang.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(java.lang.String s)` Write a string.
`void` | `write(java.lang.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.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### out

    protected java.io.Writer out

### response

    protected javax.servlet.ServletResponse response

### cb

    protected char[] cb

### nextChar

    protected int nextChar

### defaultCharBufferSize

    protected static int defaultCharBufferSize

### flushed

    protected boolean flushed

### closed

    protected boolean closed

Constructor Detail

### JspWriterImpl

    public JspWriterImpl()

### JspWriterImpl

    public JspWriterImpl(javax.servlet.ServletResponse response)

  Create a buffered character-output stream that uses a default-sized output buffer.

Parameters:
  `response` - A Servlet Response

### JspWriterImpl

    public JspWriterImpl(javax.servlet.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
Throws:
  `java.lang.IllegalArgumentException` - If sz is <= 0

Method Detail

### flushBuffer

    protected final void flushBuffer()
                              throws java.io.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:
    `java.io.IOException`

### initOut

    protected void initOut()
                    throws java.io.IOException

  Throws:
    `java.io.IOException`

### clear

    public final void clear()
                     throws java.io.IOException

  Discard the output buffer.

  Throws:
    `java.io.IOException`

### clearBuffer

    public void clearBuffer()
                     throws java.io.IOException

  Throws:
    `java.io.IOException`

### flush

    public void flush()
               throws java.io.IOException

  Flush the stream.

  Throws:
    `java.io.IOException`

### close

    public void close()
               throws java.io.IOException

  Close the stream.

  Throws:
    `java.io.IOException`

### getRemaining

    public int getRemaining()

  Returns:
    the number of bytes unused in the buffer

### ensureOpen

    protected void ensureOpen()
                       throws java.io.IOException

  check to make sure that the stream has not been closed

  Throws:
    `java.io.IOException`

### write

    public void write(int c)
               throws java.io.IOException

  Write a single character.

  Throws:
    `java.io.IOException`

### write

    public void write(char[] cbuf,
                      int off,
                      int len)
               throws java.io.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 `DiscardableBufferedWriter`s will not copy data unnecessarily.

  Parameters:
    `cbuf` - A character array
    `off` - Offset from which to start reading characters
    `len` - Number of characters to write
  Throws:
    `java.io.IOException`

### write

    public void write(char[] buf)
               throws java.io.IOException

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

  Throws:
    `java.io.IOException`

### write

    public void write(java.lang.String s,
                      int off,
                      int len)
               throws java.io.IOException

  Write a portion of a String.

  Parameters:
    `s` - String to be written
    `off` - Offset from which to start reading characters
    `len` - Number of characters to be written
  Throws:
    `java.io.IOException`

### write

    public void write(java.lang.String s)
               throws java.io.IOException

  Write a string. This method cannot be inherited from the Writer class because it must suppress I/O exceptions.

  Throws:
    `java.io.IOException`

### newLine

    public void newLine()
                 throws java.io.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.

  Throws:
    `java.io.IOException` - If an I/O error occurs

### print

    public void print(boolean b)
               throws java.io.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.

  Parameters:
    `b` - The `boolean` to be printed
  Throws:
    `java.io.IOException`

### print

    public void print(char c)
               throws java.io.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.

  Parameters:
    `c` - The `char` to be printed
  Throws:
    `java.io.IOException`

### print

    public void print(int i)
               throws java.io.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.

  Parameters:
    `i` - The `int` to be printed
  Throws:
    `java.io.IOException`

### print

    public void print(long l)
               throws java.io.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.

  Parameters:
    `l` - The `long` to be printed
  Throws:
    `java.io.IOException`

### print

    public void print(float f)
               throws java.io.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.

  Parameters:
    `f` - The `float` to be printed
  Throws:
    `java.io.IOException`

### print

    public void print(double d)
               throws java.io.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.

  Parameters:
    `d` - The `double` to be printed
  Throws:
    `java.io.IOException`

### print

    public void print(char[] s)
               throws java.io.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.

  Parameters:
    `s` - The array of chars to be printed
  Throws:
    `java.lang.NullPointerException` - If `s` is `null`
    `java.io.IOException`

### print

    public void print(java.lang.String s)
               throws java.io.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.

  Parameters:
    `s` - The `String` to be printed
  Throws:
    `java.io.IOException`

### print

    public void print(java.lang.Object obj)
               throws java.io.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.

  Parameters:
    `obj` - The `Object` to be printed
  Throws:
    `java.io.IOException`

### println

    public void println()
                 throws java.io.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...

  Throws:
    `java.io.IOException`

### println

    public void println(boolean x)
                 throws java.io.IOException

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

  Throws:
    `java.io.IOException`

### println

    public void println(char x)
                 throws java.io.IOException

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

  Throws:
    `java.io.IOException`

### println

    public void println(int x)
                 throws java.io.IOException

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

  Throws:
    `java.io.IOException`

### println

    public void println(long x)
                 throws java.io.IOException

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

  Throws:
    `java.io.IOException`

### println

    public void println(float x)
                 throws java.io.IOException

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

  Throws:
    `java.io.IOException`

### println

    public void println(double x)
                 throws java.io.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()``.

  Throws:
    `java.io.IOException`

### println

    public void println(char[] x)
                 throws java.io.IOException

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

  Throws:
    `java.io.IOException`

### println

    public void println(java.lang.String x)
                 throws java.io.IOException

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

  Throws:
    `java.io.IOException`

### println

    public void println(java.lang.Object x)
                 throws java.io.IOException

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

  Throws:
    `java.io.IOException`

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