jspwriter.java

jetty SERVER連接資料庫用的軟體

     * to the underlying writer.
     *
     * @param      s   The <code>String</code> to be printed
     * @throws	   java.io.IOException If an error occured while writing
     */

    abstract public void print(String s) throws IOException;

    /**
     * Print an object.  The string produced by the <code>{@link
     * java.lang.String#valueOf(Object)}</code> method is written to the
     * JspWriter's buffer or, if no buffer is used, directly to the
     * underlying writer.
     *
     * @param      obj   The <code>Object</code> to be printed
     * @see        java.lang.Object#toString()
     * @throws	   java.io.IOException If an error occured while writing
     */

    abstract public void print(Object obj) throws IOException;

    /**
     * Terminate the current line by writing the line separator string.  The
     * line separator string is defined by the system property
     * <code>line.separator</code>, and is not necessarily a single newline
     * character (<code>'\n'</code>).
     * @throws	   java.io.IOException If an error occured while writing
     */

    abstract public void println() throws IOException;

    /**
     * Print a boolean value and then terminate the line.  This method behaves
     * as though it invokes <code>{@link #print(boolean)}</code> and then
     * <code>{@link #println()}</code>.
     *
     * @param      x the boolean to write
     * @throws	   java.io.IOException If an error occured while writing
     */

    abstract public void println(boolean x) throws IOException;

    /**
     * Print a character and then terminate the line.  This method behaves as
     * though it invokes <code>{@link #print(char)}</code> and then <code>{@link
     * #println()}</code>.
     *
     * @param      x the char to write
     * @throws	   java.io.IOException If an error occured while writing
     */

    abstract public void println(char x) throws IOException;

    /**
     * Print an integer and then terminate the line.  This method behaves as
     * though it invokes <code>{@link #print(int)}</code> and then <code>{@link
     * #println()}</code>.
     *
     * @param      x the int to write
     * @throws	   java.io.IOException If an error occured while writing
     */

    abstract public void println(int x) throws IOException;

    /**
     * Print a long integer and then terminate the line.  This method behaves
     * as though it invokes <code>{@link #print(long)}</code> and then
     * <code>{@link #println()}</code>.
     *
     * @param      x the long to write
     * @throws	   java.io.IOException If an error occured while writing
     */

    abstract public void println(long x) throws IOException;

    /**
     * Print a floating-point number and then terminate the line.  This method
     * behaves as though it invokes <code>{@link #print(float)}</code> and then
     * <code>{@link #println()}</code>.
     *
     * @param      x the float to write
     * @throws	   java.io.IOException If an error occured while writing
     */

    abstract public void println(float x) throws IOException;

    /**
     * Print a double-precision floating-point number and then terminate the
     * line.  This method behaves as though it invokes <code>{@link
     * #print(double)}</code> and then <code>{@link #println()}</code>.
     *
     * @param      x the double to write
     * @throws	   java.io.IOException If an error occured while writing
     */

    abstract public void println(double x) throws IOException;

    /**
     * Print an array of characters and then terminate the line.  This method
     * behaves as though it invokes <code>print(char[])</code> and then
     * <code>println()</code>.
     *
     * @param      x the char[] to write
     * @throws	   java.io.IOException If an error occured while writing
     */

    abstract public void println(char x[]) throws IOException;

    /**
     * Print a String and then terminate the line.  This method behaves as
     * though it invokes <code>{@link #print(String)}</code> and then
     * <code>{@link #println()}</code>.
     *
     * @param      x the String to write
     * @throws	   java.io.IOException If an error occured while writing
     */

    abstract public void println(String x) throws IOException;

    /**
     * Print an Object and then terminate the line.  This method behaves as
     * though it invokes <code>{@link #print(Object)}</code> and then
     * <code>{@link #println()}</code>.
     *
     * @param      x the Object to write
     * @throws	   java.io.IOException If an error occured while writing
     */

    abstract public void println(Object x) throws IOException;


    /**
     * 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.
     *
     * @throws IOException		If an I/O error occurs
     */

    abstract public void clear() throws IOException;

    /**
     * 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.
     *
     * @throws IOException		If an I/O error occurs
     */

    abstract public void clearBuffer() throws IOException;

    /**
     * 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.
     * <p>
     * The method may be invoked indirectly if the buffer size is exceeded.
     * <p>
     * Once a stream has been closed,
     * further write() or flush() invocations will cause an IOException to be
     * thrown.
     *
     * @exception  IOException  If an I/O error occurs
     */

    abstract public void flush() throws IOException;

    /**
     * Close the stream, flushing it first.
     * <p>
     * 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().
     * <p>
     * Closing a previously-closed stream, unlike flush(), has no effect.
     *
     * @exception  IOException  If an I/O error occurs
     */

    abstract public void close() throws IOException;

    /**
     * This method returns the size of the buffer used by the JspWriter.
     *
     * @return the size of the buffer in bytes, or 0 is unbuffered.
     */

    public int getBufferSize() { return bufferSize; }

    /**
     * This method returns the number of unused bytes in the buffer.
     *
     * @return the number of bytes unused in the buffer
     */

    abstract public int getRemaining();

    /**
     * This method indicates whether the JspWriter is autoFlushing.
     *
     * @return if this JspWriter is auto flushing or throwing IOExceptions 
     *     on buffer overflow conditions
     */

    public boolean isAutoFlush() { return autoFlush; }

    /*
     * fields
     */

    /**
     * The size of the buffer used by the JspWriter.
     */
    protected int     bufferSize;
    
    /**
     * Whether the JspWriter is autoflushing.
     */
    protected boolean autoFlush;
}