fc.web.page
Class PageReader

java.lang.Object
  java.io.Reader
      fc.web.page.PageReader

All Implemented Interfaces:

Closeable, Readable

public final class PageReader
extends Reader

A Reader suitable for lexing. Supports all of: peek, read and unread. (no JDK 1.5 reader class has all of those). Mark/reset is not supported because it's too complex to implement given the current fixed-buffer implementation of this class. (on the flip-side this implementation does allow to read very large files without risk of running out of JDK memory).

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Note 1: If this class is invoked from the command line, setting the dbg flag in the code to true is useful.

Constructor Summary

PageReader(File file)
Creates a reader using the platform's default character encoding.

PageReader(File file, String encoding)
Creates a reader with the specified non-null encoding.

PageReader(Reader r)
Creates a new PageReader wrapping the specified reader

Method Summary

void	close()
int	getCol()
int	getLine()
static void	main(String[] args)
boolean	markSupported()
boolean	match(int target) Tries to read/consumes the specified char and returns true if successful.
boolean	match(String target) Tries to read/consumes the specified non-null string and returns true if successful.
boolean	matchIgnoreCase(String target)
int	peek()
int	read()
int	read(char[] buf, int start, int len)
void	skipWhitespace() Skips all whitespace characters such that the next read will return the next non-whitespace character (or EOF if there are no more characters).
void	unread() Unreads the current character (which could be EOF) so that the next read will return the current character (or EOF) again.
void	unread(int count) Unreads the specified number of characters

Methods inherited from class java.io.Reader

mark, read, read, ready, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

PageReader

public PageReader(Reader r)

Creates a new PageReader wrapping the specified reader

PageReader

public PageReader(File file,
                  String encoding)
           throws IOException

Creates a reader with the specified non-null encoding.

Throws:

IOException

PageReader

public PageReader(File file)
           throws IOException

Creates a reader using the platform's default character encoding.

Throws:

IOException

Method Detail

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in class Reader

Throws:

IOException

read

public int read()
         throws IOException

Overrides:

read in class Reader

Throws:

IOException

read

public int read(char[] buf,
                int start,
                int len)
         throws IOException

Specified by:

read in class Reader

Throws:

IOException

unread

public void unread()
            throws IOException

Unreads the current character (which could be EOF) so that the next read will return the current character (or EOF) again.

Throws:

IOException

unread

public void unread(int count)
            throws IOException

Unreads the specified number of characters

Throws:

IOException

peek

public int peek()
         throws IOException

Throws:

IOException

skipWhitespace

public void skipWhitespace()
                    throws IOException

Skips all whitespace characters such that the next read will return the next non-whitespace character (or EOF if there are no more characters).

Throws:

IOException

match

public boolean match(int target)
              throws IOException

Tries to read/consumes the specified char and returns true if successful. If the specified char is not found, does not consume anything and returns false.

Throws:

IOException

match

public boolean match(String target)
              throws IOException

Tries to read/consumes the specified non-null string and returns true if successful. If the specified string is not found, does not consume anything and returns false.

Throws:

IOException

matchIgnoreCase

public boolean matchIgnoreCase(String target)
                        throws IOException

Throws:

IOException

markSupported

public boolean markSupported()

Overrides:

markSupported in class Reader

getLine

public int getLine()

getCol

public int getCol()

main

public static void main(String[] args)
                 throws IOException

Throws:

IOException