code::LineReader Class Reference
[Reader]

Inheritance diagram for code::LineReader:

List of all members.

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Detailed Description

Reader Decorator which adds line-by-line reading.

This is much faster than walking through a reader character by character.

Sample Use:

 include <wdssii/code_LineReader.h>
 include <wdssii/code_URL.h>

 std::string line;
 URL url = "/tmp/readme.gz";
 SmartPtr<LineReader> lineReader = new LineReader (Reader::getReader (url));
 while (lineReader->readLine (line))
 {
   do_something_with_line (line);
 }
 

Author:

Charles Kerr

Version:

Id

code_LineReader.h,v 1.2 2009/06/02 20:17:39 lakshman Exp

Public Member Functions
virtual bool	readLine (std::string &setme_line)
	Reads the next line from the Reader.
	LineReader (SmartPtr< Reader > source)
virtual	~LineReader ()
virtual int	read (Buffer &, long offset=0, size_t max_bytes=0)
Static Public Member Functions
static SmartPtr< LineReader >	getLineReader (const URL &url)
	Convenience function that wraps a lower-level Reader for you.
static int	read (const URL &url, Buffer &buffer, long offset=0, size_t max_len=0)
	Convenience function to read `url' into `buf'.
static int	read (const URL &url, std::string &s, long offset=0, size_t max_len=0)
	Identical to read(const URL&,Buffer&,long,size_t) except it takes a string instead of a buffer.
static int	readRaw (const URL &url, Buffer &b, long offset=0, size_t max_len=0)
	Identical to read() except except it doesn't uncompress files.
static SmartPtr< XML::Document >	readXMLDocument (const URL &url)
	Returns an XML::Document created by passing the contents of `url' to XML::Parser::parse().
static SmartPtr< Reader >	getReader (const URL &url)
	Returns a handle to a reader for the given URL.
static void	introduceWDSSIIReaders ()
Protected Attributes
int	myIndex
Buffer	myBuf

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Constructor & Destructor Documentation

code::LineReader::LineReader

(

SmartPtr< Reader >

source

)

[inline]

virtual code::LineReader::~LineReader

(

)

[inline, virtual]

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Member Function Documentation

static SmartPtr<LineReader> code::LineReader::getLineReader

(

const URL &

url

)

[inline, static]

Convenience function that wraps a lower-level Reader for you.

This makes getting a LineReader a little simpler. The following two lines are equivalent:

 SmartPtr<LineReader> lineReader = new LineReader (Reader :: getReader (url));
 SmartPtr<LineReader> lineReader = LineReader :: getLineReader (url);

static SmartPtr<Reader> code::Reader::getReader

(

const URL &

url

)

[static, inherited]

Returns a handle to a reader for the given URL.

This is useful when you want to make iterative calls to read() or LineReader::readLine().

static void code::Reader::introduceWDSSIIReaders

(

)

[static, inherited]

static int code::Reader::read	(	const URL &	url,
		std::string &	s,
		long	offset = 0,
		size_t	max_len = 0
	)			[static, inherited]

Identical to read(const URL&,Buffer&,long,size_t) except it takes a string instead of a buffer.

static int code::Reader::read	(	const URL &	url,
		Buffer &	buffer,
		long	offset = 0,
		size_t	max_len = 0
	)			[static, inherited]

Convenience function to read `url' into `buf'.

Handles remote, local, compressed, and uncompressed files transparently.

Parameters:

	url	the data source.
	buffer	where source's contents will be stored.
	offset	number of bytes to skip before read() begins storing.
	max_len	if nonzero, maximum number of bytes to store in buf.

Returns:

the number of bytes read, or a negative number on error.

virtual int code::InMemoryReader::read	(	Buffer &	,
		long	offset = 0,
		size_t	max_bytes = 0
	)			[virtual, inherited]

See also:

static int read (URL, Buffer, offset, long, size_t);

Implements code::Reader.

virtual bool code::LineReader::readLine

(

std::string &

setme_line

)

[virtual]

Reads the next line from the Reader.

Returns:

true if a line -- even an empty line -- was read.

Parameters:

setme_line

on success, the Reader's next line is stored here.

static int code::Reader::readRaw	(	const URL &	url,
		Buffer &	b,
		long	offset = 0,
		size_t	max_len = 0
	)			[static, inherited]

Identical to read() except except it doesn't uncompress files.

This is useful when mirroring compressed files to avoid decompress / recompress steps.

static SmartPtr<XML::Document> code::Reader::readXMLDocument

(

const URL &

url

)

[static, inherited]

Returns an XML::Document created by passing the contents of `url' to XML::Parser::parse().

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Member Data Documentation

Buffer code::InMemoryReader::myBuf [protected, inherited]

int code::InMemoryReader::myIndex [protected, inherited]

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