Class 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
    • Constructor Summary

      Constructors 
      Constructor 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

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method 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.
    • 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
      • 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
      • 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​(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