Package 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
    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
    Description
    final void
    clear()
    Clear the contents of the buffer.
    void
    clearBuffer()
    Clears the current contents of the buffer.
    void
    close()
    Close the stream, flushing it first.
    void
    flush()
    Flush the stream.
    protected final 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)
     
    void
    write(char[] cbuf, int off, int len)
     
    void
    write(int c)
     
    void
    write(String s, int off, int len)
     

    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 Details

    • 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 Details

    • 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
      Description copied from class: JspWriter
      Clear the contents of the buffer. If the buffer has been already been flushed then the clear operation shall throw an IOException to signal the fact that some data has already been irrevocably written to the client response stream.
      Specified by:
      clear in class JspWriter
      Throws:
      IOException - If an I/O error occurs

    • clearBuffer

      public void clearBuffer() throws IOException
      Description copied from class: 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
      Description copied from class: JspWriter
      Flush the stream. If the stream has saved any characters from the various write() methods in a buffer, write them immediately to their intended destination. Then, if that destination is another character or byte stream, flush it. Thus one flush() invocation will flush all the buffers in a chain of Writers and OutputStreams.

      The method may be invoked indirectly if the buffer size is exceeded.

      Once a stream has been closed, further write() or flush() invocations will cause an IOException to be thrown.

      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
      Description copied from class: JspWriter
      Close the stream, flushing it first.

      This method needs not be invoked explicitly for the initial JspWriter as the code generated by the JSP container will automatically include a call to close().

      Closing a previously-closed stream, unlike flush(), has no effect.

      Specified by:
      close in interface AutoCloseable
      Specified by:
      close in interface Closeable
      Specified by:
      close in class JspWriter
      Throws:
      IOException - If an I/O error occurs

    • getRemaining

      public int getRemaining()
      Description copied from class: 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
      Overrides:
      write in class Writer
      Throws:
      IOException

    • write

      public void write(char[] cbuf, int off, int len) throws IOException
      Specified by:
      write in class Writer
      Throws:
      IOException

    • write

      public void write(char[] buf) throws IOException
      Overrides:
      write in class Writer
      Throws:
      IOException

    • write

      public void write(String s, int off, int len) throws IOException
      Overrides:
      write in class Writer
      Throws:
      IOException

    • newLine

      public void newLine() throws IOException
      Description copied from class: JspWriter
      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
      Description copied from class: JspWriter
      Print a boolean value. The string produced by String.valueOf(boolean) is written to the JspWriter's buffer or, if no buffer is used, directly to the underlying writer.
      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
      Description copied from class: JspWriter
      Print a character. The character is written to the JspWriter's buffer or, if no buffer is used, directly to the underlying writer.
      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
      Description copied from class: JspWriter
      Print an integer. The string produced by String.valueOf(int) is written to the JspWriter's buffer or, if no buffer is used, directly to the underlying writer.
      Specified by:
      print in class JspWriter
      Parameters:
      i - The int to be printed
      Throws:
      IOException - If an error occurred while writing
      See Also:

    • print

      public void print(long l) throws IOException
      Description copied from class: JspWriter
      Print a long integer. The string produced by String.valueOf(long) is written to the JspWriter's buffer or, if no buffer is used, directly to the underlying writer.
      Specified by:
      print in class JspWriter
      Parameters:
      l - The long to be printed
      Throws:
      IOException - If an error occurred while writing
      See Also:

    • print

      public void print(float f) throws IOException
      Description copied from class: JspWriter
      Print a floating-point number. The string produced by String.valueOf(float) is written to the JspWriter's buffer or, if no buffer is used, directly to the underlying writer.
      Specified by:
      print in class JspWriter
      Parameters:
      f - The float to be printed
      Throws:
      IOException - If an error occurred while writing
      See Also:

    • print

      public void print(double d) throws IOException
      Description copied from class: JspWriter
      Print a double-precision floating-point number. The string produced by String.valueOf(double) is written to the JspWriter's buffer or, if no buffer is used, directly to the underlying writer.
      Specified by:
      print in class JspWriter
      Parameters:
      d - The double to be printed
      Throws:
      IOException - If an error occurred while writing
      See Also:

    • print

      public void print(char[] s) throws IOException
      Description copied from class: JspWriter
      Print an array of characters. The characters are written to the JspWriter's buffer or, if no buffer is used, directly to the underlying writer.
      Specified by:
      print in class JspWriter
      Parameters:
      s - The array of chars to be printed
      Throws:
      IOException - If an error occurred while writing

    • print

      public void print(String s) throws IOException
      Description copied from class: JspWriter
      Print a string. If the argument is null then the string "null" is printed. Otherwise, the string's characters are written to the JspWriter's buffer or, if no buffer is used, directly to the underlying writer.
      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
      Description copied from class: JspWriter
      Print an object. The string produced by the String.valueOf(Object) method is written to the JspWriter's buffer or, if no buffer is used, directly to the underlying writer.
      Specified by:
      print in class JspWriter
      Parameters:
      obj - The Object to be printed
      Throws:
      IOException - If an error occurred while writing
      See Also:

    • println

      public void println() throws IOException
      Description copied from class: JspWriter
      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').
      Specified by:
      println in class JspWriter
      Throws:
      IOException - If an error occurred while writing

    • println

      public void println(boolean x) throws IOException
      Description copied from class: JspWriter
      Print a boolean value and then terminate the line. This method behaves as though it invokes JspWriter.print(boolean) and then JspWriter.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
      Description copied from class: JspWriter
      Print a character and then terminate the line. This method behaves as though it invokes JspWriter.print(char) and then JspWriter.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
      Description copied from class: JspWriter
      Print an integer and then terminate the line. This method behaves as though it invokes JspWriter.print(int) and then JspWriter.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
      Description copied from class: JspWriter
      Print a long integer and then terminate the line. This method behaves as though it invokes JspWriter.print(long) and then JspWriter.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
      Description copied from class: JspWriter
      Print a floating-point number and then terminate the line. This method behaves as though it invokes JspWriter.print(float) and then JspWriter.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
      Description copied from class: JspWriter
      Print a double-precision floating-point number and then terminate the line. This method behaves as though it invokes JspWriter.print(double) and then JspWriter.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
      Description copied from class: JspWriter
      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
      Description copied from class: JspWriter
      Print a String and then terminate the line. This method behaves as though it invokes JspWriter.print(String) and then JspWriter.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
      Description copied from class: JspWriter
      Print an Object and then terminate the line. This method behaves as though it invokes JspWriter.print(Object) and then JspWriter.println().
      Specified by:
      println in class JspWriter
      Parameters:
      x - the Object to write
      Throws:
      IOException - If an error occurred while writing